/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp

Bug Summary

File:	llvm/lib/Transforms/Scalar/SROA.cpp
Warning:	line 2144, column 3 Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name SROA.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mthread-model posix -mframe-pointer=none -fmath-errno -fno-rounding-math -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-10/lib/clang/10.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/build-llvm/lib/Transforms/Scalar -I /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar -I /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/build-llvm/include -I /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-10/lib/clang/10.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/build-llvm/lib/Transforms/Scalar -fdebug-prefix-map=/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809=. -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fobjc-runtime=gcc -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -o /tmp/scan-build-2019-12-11-181444-25759-1 -x c++ /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp

/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp

→

1//===- SROA.cpp - Scalar Replacement Of Aggregates ------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8/// \file
9/// This transformation implements the well known scalar replacement of
10/// aggregates transformation. It tries to identify promotable elements of an
11/// aggregate alloca, and promote them to registers. It will also try to
12/// convert uses of an element (or set of elements) of an alloca into a vector
13/// or bitfield-style integer scalar if appropriate.
14///
15/// It works to do this with minimal slicing of the alloca so that regions
16/// which are merely transferred in and out of external memory remain unchanged
17/// and are not decomposed to scalar code.
18///
19/// Because this also performs alloca promotion, it can be thought of as also
20/// serving the purpose of SSA formation. The algorithm iterates on the
21/// function until all opportunities for promotion have been realized.
22///
23//===----------------------------------------------------------------------===//

25#include "llvm/Transforms/Scalar/SROA.h"
26#include "llvm/ADT/APInt.h"
27#include "llvm/ADT/ArrayRef.h"
28#include "llvm/ADT/DenseMap.h"
29#include "llvm/ADT/PointerIntPair.h"
30#include "llvm/ADT/STLExtras.h"
31#include "llvm/ADT/SetVector.h"
32#include "llvm/ADT/SmallBitVector.h"
33#include "llvm/ADT/SmallPtrSet.h"
34#include "llvm/ADT/SmallVector.h"
35#include "llvm/ADT/Statistic.h"
36#include "llvm/ADT/StringRef.h"
37#include "llvm/ADT/Twine.h"
38#include "llvm/ADT/iterator.h"
39#include "llvm/ADT/iterator_range.h"
40#include "llvm/Analysis/AssumptionCache.h"
41#include "llvm/Analysis/GlobalsModRef.h"
42#include "llvm/Analysis/Loads.h"
43#include "llvm/Analysis/PtrUseVisitor.h"
44#include "llvm/Transforms/Utils/Local.h"
45#include "llvm/Config/llvm-config.h"
46#include "llvm/IR/BasicBlock.h"
47#include "llvm/IR/Constant.h"
48#include "llvm/IR/ConstantFolder.h"
49#include "llvm/IR/Constants.h"
50#include "llvm/IR/DIBuilder.h"
51#include "llvm/IR/DataLayout.h"
52#include "llvm/IR/DebugInfoMetadata.h"
53#include "llvm/IR/DerivedTypes.h"
54#include "llvm/IR/Dominators.h"
55#include "llvm/IR/Function.h"
56#include "llvm/IR/GetElementPtrTypeIterator.h"
57#include "llvm/IR/GlobalAlias.h"
58#include "llvm/IR/IRBuilder.h"
59#include "llvm/IR/InstVisitor.h"
60#include "llvm/IR/InstrTypes.h"
61#include "llvm/IR/Instruction.h"
62#include "llvm/IR/Instructions.h"
63#include "llvm/IR/IntrinsicInst.h"
64#include "llvm/IR/Intrinsics.h"
65#include "llvm/IR/LLVMContext.h"
66#include "llvm/IR/Metadata.h"
67#include "llvm/IR/Module.h"
68#include "llvm/IR/Operator.h"
69#include "llvm/IR/PassManager.h"
70#include "llvm/IR/Type.h"
71#include "llvm/IR/Use.h"
72#include "llvm/IR/User.h"
73#include "llvm/IR/Value.h"
74#include "llvm/Pass.h"
75#include "llvm/Support/Casting.h"
76#include "llvm/Support/CommandLine.h"
77#include "llvm/Support/Compiler.h"
78#include "llvm/Support/Debug.h"
79#include "llvm/Support/ErrorHandling.h"
80#include "llvm/Support/MathExtras.h"
81#include "llvm/Support/raw_ostream.h"
82#include "llvm/Transforms/Scalar.h"
83#include "llvm/Transforms/Utils/PromoteMemToReg.h"
84#include <algorithm>
85#include <cassert>
86#include <chrono>
87#include <cstddef>
88#include <cstdint>
89#include <cstring>
90#include <iterator>
91#include <string>
92#include <tuple>
93#include <utility>
94#include <vector>

96#ifndef NDEBUG
97// We only use this for a debug check.
98#include <random>
99#endif

101using namespace llvm;
102using namespace llvm::sroa;

104#define DEBUG_TYPE"sroa" "sroa"

106STATISTIC(NumAllocasAnalyzed, "Number of allocas analyzed for replacement")static llvm::Statistic NumAllocasAnalyzed = {"sroa", "NumAllocasAnalyzed"
, "Number of allocas analyzed for replacement"};
107STATISTIC(NumAllocaPartitions, "Number of alloca partitions formed")static llvm::Statistic NumAllocaPartitions = {"sroa", "NumAllocaPartitions"
, "Number of alloca partitions formed"};
108STATISTIC(MaxPartitionsPerAlloca, "Maximum number of partitions per alloca")static llvm::Statistic MaxPartitionsPerAlloca = {"sroa", "MaxPartitionsPerAlloca"
, "Maximum number of partitions per alloca"};
109STATISTIC(NumAllocaPartitionUses, "Number of alloca partition uses rewritten")static llvm::Statistic NumAllocaPartitionUses = {"sroa", "NumAllocaPartitionUses"
, "Number of alloca partition uses rewritten"};
110STATISTIC(MaxUsesPerAllocaPartition, "Maximum number of uses of a partition")static llvm::Statistic MaxUsesPerAllocaPartition = {"sroa", "MaxUsesPerAllocaPartition"
, "Maximum number of uses of a partition"};
111STATISTIC(NumNewAllocas, "Number of new, smaller allocas introduced")static llvm::Statistic NumNewAllocas = {"sroa", "NumNewAllocas"
, "Number of new, smaller allocas introduced"};
112STATISTIC(NumPromoted, "Number of allocas promoted to SSA values")static llvm::Statistic NumPromoted = {"sroa", "NumPromoted", "Number of allocas promoted to SSA values"
};
113STATISTIC(NumLoadsSpeculated, "Number of loads speculated to allow promotion")static llvm::Statistic NumLoadsSpeculated = {"sroa", "NumLoadsSpeculated"
, "Number of loads speculated to allow promotion"};
114STATISTIC(NumDeleted, "Number of instructions deleted")static llvm::Statistic NumDeleted = {"sroa", "NumDeleted", "Number of instructions deleted"
};
115STATISTIC(NumVectorized, "Number of vectorized aggregates")static llvm::Statistic NumVectorized = {"sroa", "NumVectorized"
, "Number of vectorized aggregates"};

117/// Hidden option to enable randomly shuffling the slices to help uncover
118/// instability in their order.
119static cl::opt<bool> SROARandomShuffleSlices("sroa-random-shuffle-slices",
                                           cl::init(false), cl::Hidden);

122/// Hidden option to experiment with completely strict handling of inbounds
123/// GEPs.
124static cl::opt<bool> SROAStrictInbounds("sroa-strict-inbounds", cl::init(false),
                                      cl::Hidden);

127namespace {

129/// A custom IRBuilder inserter which prefixes all names, but only in
130/// Assert builds.
131class IRBuilderPrefixedInserter : public IRBuilderDefaultInserter {
std::string Prefix;

const Twine getNameWithPrefix(const Twine &Name) const {
  return Name.isTriviallyEmpty() ? Name : Prefix + Name;
45
←
'?' condition is false→
46
←
Calling 'operator+'→
49
←
Returning from 'operator+'→
}

138public:
void SetNamePrefix(const Twine &P) { Prefix = P.str(); }

141protected:
void InsertHelper(Instruction *I, const Twine &Name, BasicBlock *BB,
                  BasicBlock::iterator InsertPt) const {
  IRBuilderDefaultInserter::InsertHelper(I, getNameWithPrefix(Name), BB,
44
←
Calling 'IRBuilderPrefixedInserter::getNameWithPrefix'→
50
←
Returning from 'IRBuilderPrefixedInserter::getNameWithPrefix'→
                                         InsertPt);
}
147};

149/// Provide a type for IRBuilder that drops names in release builds.
150using IRBuilderTy = IRBuilder<ConstantFolder, IRBuilderPrefixedInserter>;

152/// A used slice of an alloca.
153///
154/// This structure represents a slice of an alloca used by some instruction. It
155/// stores both the begin and end offsets of this use, a pointer to the use
156/// itself, and a flag indicating whether we can classify the use as splittable
157/// or not when forming partitions of the alloca.
158class Slice {
/// The beginning offset of the range.
uint64_t BeginOffset = 0;

/// The ending offset, not included in the range.
uint64_t EndOffset = 0;

/// Storage for both the use of this slice and whether it can be
/// split.
PointerIntPair<Use *, 1, bool> UseAndIsSplittable;

169public:
Slice() = default;

Slice(uint64_t BeginOffset, uint64_t EndOffset, Use *U, bool IsSplittable)
    : BeginOffset(BeginOffset), EndOffset(EndOffset),
      UseAndIsSplittable(U, IsSplittable) {}

uint64_t beginOffset() const { return BeginOffset; }
uint64_t endOffset() const { return EndOffset; }

bool isSplittable() const { return UseAndIsSplittable.getInt(); }
void makeUnsplittable() { UseAndIsSplittable.setInt(false); }

Use *getUse() const { return UseAndIsSplittable.getPointer(); }

bool isDead() const { return getUse() == nullptr; }
void kill() { UseAndIsSplittable.setPointer(nullptr); }

/// Support for ordering ranges.
///
/// This provides an ordering over ranges such that start offsets are
/// always increasing, and within equal start offsets, the end offsets are
/// decreasing. Thus the spanning range comes first in a cluster with the
/// same start position.
bool operator<(const Slice &RHS) const {
  if (beginOffset() < RHS.beginOffset())
    return true;
  if (beginOffset() > RHS.beginOffset())
    return false;
  if (isSplittable() != RHS.isSplittable())
    return !isSplittable();
  if (endOffset() > RHS.endOffset())
    return true;
  return false;
}

/// Support comparison with a single offset to allow binary searches.
friend LLVM_ATTRIBUTE_UNUSED__attribute__((__unused__)) bool operator<(const Slice &LHS,
                                            uint64_t RHSOffset) {
  return LHS.beginOffset() < RHSOffset;
}
friend LLVM_ATTRIBUTE_UNUSED__attribute__((__unused__)) bool operator<(uint64_t LHSOffset,
                                            const Slice &RHS) {
  return LHSOffset < RHS.beginOffset();
}

bool operator==(const Slice &RHS) const {
  return isSplittable() == RHS.isSplittable() &&
         beginOffset() == RHS.beginOffset() && endOffset() == RHS.endOffset();
}
bool operator!=(const Slice &RHS) const { return !operator==(RHS); }
220};

222} // end anonymous namespace

224/// Representation of the alloca slices.
225///
226/// This class represents the slices of an alloca which are formed by its
227/// various uses. If a pointer escapes, we can't fully build a representation
228/// for the slices used and we reflect that in this structure. The uses are
229/// stored, sorted by increasing beginning offset and with unsplittable slices
230/// starting at a particular offset before splittable slices.
231class llvm::sroa::AllocaSlices {
232public:
/// Construct the slices of a particular alloca.
AllocaSlices(const DataLayout &DL, AllocaInst &AI);

/// Test whether a pointer to the allocation escapes our analysis.
///
/// If this is true, the slices are never fully built and should be
/// ignored.
bool isEscaped() const { return PointerEscapingInstr; }

/// Support for iterating over the slices.
/// @{
using iterator = SmallVectorImpl<Slice>::iterator;
using range = iterator_range<iterator>;

iterator begin() { return Slices.begin(); }
iterator end() { return Slices.end(); }

using const_iterator = SmallVectorImpl<Slice>::const_iterator;
using const_range = iterator_range<const_iterator>;

const_iterator begin() const { return Slices.begin(); }
const_iterator end() const { return Slices.end(); }
/// @}

/// Erase a range of slices.
void erase(iterator Start, iterator Stop) { Slices.erase(Start, Stop); }

/// Insert new slices for this alloca.
///
/// This moves the slices into the alloca's slices collection, and re-sorts
/// everything so that the usual ordering properties of the alloca's slices
/// hold.
void insert(ArrayRef<Slice> NewSlices) {
  int OldSize = Slices.size();
  Slices.append(NewSlices.begin(), NewSlices.end());
  auto SliceI = Slices.begin() + OldSize;
  llvm::sort(SliceI, Slices.end());
  std::inplace_merge(Slices.begin(), SliceI, Slices.end());
}

// Forward declare the iterator and range accessor for walking the
// partitions.
class partition_iterator;
iterator_range<partition_iterator> partitions();

/// Access the dead users for this alloca.
ArrayRef<Instruction *> getDeadUsers() const { return DeadUsers; }

/// Access the dead operands referring to this alloca.
///
/// These are operands which have cannot actually be used to refer to the
/// alloca as they are outside its range and the user doesn't correct for
/// that. These mostly consist of PHI node inputs and the like which we just
/// need to replace with undef.
ArrayRef<Use *> getDeadOperands() const { return DeadOperands; }

289#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
void print(raw_ostream &OS, const_iterator I, StringRef Indent = "  ") const;
void printSlice(raw_ostream &OS, const_iterator I,
                StringRef Indent = "  ") const;
void printUse(raw_ostream &OS, const_iterator I,
              StringRef Indent = "  ") const;
void print(raw_ostream &OS) const;
void dump(const_iterator I) const;
void dump() const;
298#endif

300private:
template <typename DerivedT, typename RetT = void> class BuilderBase;
class SliceBuilder;

friend class AllocaSlices::SliceBuilder;

306#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
/// Handle to alloca instruction to simplify method interfaces.
AllocaInst &AI;
309#endif

/// The instruction responsible for this alloca not having a known set
/// of slices.
///
/// When an instruction (potentially) escapes the pointer to the alloca, we
/// store a pointer to that here and abort trying to form slices of the
/// alloca. This will be null if the alloca slices are analyzed successfully.
Instruction *PointerEscapingInstr;

/// The slices of the alloca.
///
/// We store a vector of the slices formed by uses of the alloca here. This
/// vector is sorted by increasing begin offset, and then the unsplittable
/// slices before the splittable ones. See the Slice inner class for more
/// details.
SmallVector<Slice, 8> Slices;

/// Instructions which will become dead if we rewrite the alloca.
///
/// Note that these are not separated by slice. This is because we expect an
/// alloca to be completely rewritten or not rewritten at all. If rewritten,
/// all these instructions can simply be removed and replaced with undef as
/// they come from outside of the allocated space.
SmallVector<Instruction *, 8> DeadUsers;

/// Operands which will become dead if we rewrite the alloca.
///
/// These are operands that in their particular use can be replaced with
/// undef when we rewrite the alloca. These show up in out-of-bounds inputs
/// to PHI nodes and the like. They aren't entirely dead (there might be
/// a GEP back into the bounds using it elsewhere) and nor is the PHI, but we
/// want to swap this particular input for undef to simplify the use lists of
/// the alloca.
SmallVector<Use *, 8> DeadOperands;
344};

346/// A partition of the slices.
347///
348/// An ephemeral representation for a range of slices which can be viewed as
349/// a partition of the alloca. This range represents a span of the alloca's
350/// memory which cannot be split, and provides access to all of the slices
351/// overlapping some part of the partition.
352///
353/// Objects of this type are produced by traversing the alloca's slices, but
354/// are only ephemeral and not persistent.
355class llvm::sroa::Partition {
356private:
friend class AllocaSlices;
friend class AllocaSlices::partition_iterator;

using iterator = AllocaSlices::iterator;

/// The beginning and ending offsets of the alloca for this
/// partition.
uint64_t BeginOffset, EndOffset;

/// The start and end iterators of this partition.
iterator SI, SJ;

/// A collection of split slice tails overlapping the partition.
SmallVector<Slice *, 4> SplitTails;

/// Raw constructor builds an empty partition starting and ending at
/// the given iterator.
Partition(iterator SI) : SI(SI), SJ(SI) {}

376public:
/// The start offset of this partition.
///
/// All of the contained slices start at or after this offset.
uint64_t beginOffset() const { return BeginOffset; }

/// The end offset of this partition.
///
/// All of the contained slices end at or before this offset.
uint64_t endOffset() const { return EndOffset; }

/// The size of the partition.
///
/// Note that this can never be zero.
uint64_t size() const {
  assert(BeginOffset < EndOffset && "Partitions must span some bytes!")((BeginOffset < EndOffset && "Partitions must span some bytes!"
) ? static_cast<void> (0) : __assert_fail ("BeginOffset < EndOffset && \"Partitions must span some bytes!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 391, __PRETTY_FUNCTION__));
  return EndOffset - BeginOffset;
}

/// Test whether this partition contains no slices, and merely spans
/// a region occupied by split slices.
bool empty() const { return SI == SJ; }

/// \name Iterate slices that start within the partition.
/// These may be splittable or unsplittable. They have a begin offset >= the
/// partition begin offset.
/// @{
// FIXME: We should probably define a "concat_iterator" helper and use that
// to stitch together pointee_iterators over the split tails and the
// contiguous iterators of the partition. That would give a much nicer
// interface here. We could then additionally expose filtered iterators for
// split, unsplit, and unsplittable splices based on the usage patterns.
iterator begin() const { return SI; }
iterator end() const { return SJ; }
/// @}

/// Get the sequence of split slice tails.
///
/// These tails are of slices which start before this partition but are
/// split and overlap into the partition. We accumulate these while forming
/// partitions.
ArrayRef<Slice *> splitSliceTails() const { return SplitTails; }
418};

420/// An iterator over partitions of the alloca's slices.
421///
422/// This iterator implements the core algorithm for partitioning the alloca's
423/// slices. It is a forward iterator as we don't support backtracking for
424/// efficiency reasons, and re-use a single storage area to maintain the
425/// current set of split slices.
426///
427/// It is templated on the slice iterator type to use so that it can operate
428/// with either const or non-const slice iterators.
429class AllocaSlices::partition_iterator
  : public iterator_facade_base<partition_iterator, std::forward_iterator_tag,
                                Partition> {
friend class AllocaSlices;

/// Most of the state for walking the partitions is held in a class
/// with a nice interface for examining them.
Partition P;

/// We need to keep the end of the slices to know when to stop.
AllocaSlices::iterator SE;

/// We also need to keep track of the maximum split end offset seen.
/// FIXME: Do we really?
uint64_t MaxSplitSliceEndOffset = 0;

/// Sets the partition to be empty at given iterator, and sets the
/// end iterator.
partition_iterator(AllocaSlices::iterator SI, AllocaSlices::iterator SE)
    : P(SI), SE(SE) {
  // If not already at the end, advance our state to form the initial
  // partition.
  if (SI != SE)
    advance();
}

/// Advance the iterator to the next partition.
///
/// Requires that the iterator not be at the end of the slices.
void advance() {
  assert((P.SI != SE || !P.SplitTails.empty()) &&(((P.SI != SE || !P.SplitTails.empty()) && "Cannot advance past the end of the slices!"
) ? static_cast<void> (0) : __assert_fail ("(P.SI != SE || !P.SplitTails.empty()) && \"Cannot advance past the end of the slices!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 460, __PRETTY_FUNCTION__))
         "Cannot advance past the end of the slices!")(((P.SI != SE || !P.SplitTails.empty()) && "Cannot advance past the end of the slices!"
) ? static_cast<void> (0) : __assert_fail ("(P.SI != SE || !P.SplitTails.empty()) && \"Cannot advance past the end of the slices!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 460, __PRETTY_FUNCTION__));

  // Clear out any split uses which have ended.
  if (!P.SplitTails.empty()) {
    if (P.EndOffset >= MaxSplitSliceEndOffset) {
      // If we've finished all splits, this is easy.
      P.SplitTails.clear();
      MaxSplitSliceEndOffset = 0;
    } else {
      // Remove the uses which have ended in the prior partition. This
      // cannot change the max split slice end because we just checked that
      // the prior partition ended prior to that max.
      P.SplitTails.erase(llvm::remove_if(P.SplitTails,
                                         [&](Slice *S) {
                                           return S->endOffset() <=
                                                  P.EndOffset;
                                         }),
                         P.SplitTails.end());
      assert(llvm::any_of(P.SplitTails,((llvm::any_of(P.SplitTails, [&](Slice *S) { return S->
endOffset() == MaxSplitSliceEndOffset; }) && "Could not find the current max split slice offset!"
) ? static_cast<void> (0) : __assert_fail ("llvm::any_of(P.SplitTails, [&](Slice *S) { return S->endOffset() == MaxSplitSliceEndOffset; }) && \"Could not find the current max split slice offset!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 482, __PRETTY_FUNCTION__))
                          [&](Slice *S) {((llvm::any_of(P.SplitTails, [&](Slice *S) { return S->
endOffset() == MaxSplitSliceEndOffset; }) && "Could not find the current max split slice offset!"
) ? static_cast<void> (0) : __assert_fail ("llvm::any_of(P.SplitTails, [&](Slice *S) { return S->endOffset() == MaxSplitSliceEndOffset; }) && \"Could not find the current max split slice offset!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 482, __PRETTY_FUNCTION__))
                            return S->endOffset() == MaxSplitSliceEndOffset;((llvm::any_of(P.SplitTails, [&](Slice *S) { return S->
endOffset() == MaxSplitSliceEndOffset; }) && "Could not find the current max split slice offset!"
) ? static_cast<void> (0) : __assert_fail ("llvm::any_of(P.SplitTails, [&](Slice *S) { return S->endOffset() == MaxSplitSliceEndOffset; }) && \"Could not find the current max split slice offset!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 482, __PRETTY_FUNCTION__))
                          }) &&((llvm::any_of(P.SplitTails, [&](Slice *S) { return S->
endOffset() == MaxSplitSliceEndOffset; }) && "Could not find the current max split slice offset!"
) ? static_cast<void> (0) : __assert_fail ("llvm::any_of(P.SplitTails, [&](Slice *S) { return S->endOffset() == MaxSplitSliceEndOffset; }) && \"Could not find the current max split slice offset!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 482, __PRETTY_FUNCTION__))
             "Could not find the current max split slice offset!")((llvm::any_of(P.SplitTails, [&](Slice *S) { return S->
endOffset() == MaxSplitSliceEndOffset; }) && "Could not find the current max split slice offset!"
) ? static_cast<void> (0) : __assert_fail ("llvm::any_of(P.SplitTails, [&](Slice *S) { return S->endOffset() == MaxSplitSliceEndOffset; }) && \"Could not find the current max split slice offset!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 482, __PRETTY_FUNCTION__));
      assert(llvm::all_of(P.SplitTails,((llvm::all_of(P.SplitTails, [&](Slice *S) { return S->
endOffset() <= MaxSplitSliceEndOffset; }) && "Max split slice end offset is not actually the max!"
) ? static_cast<void> (0) : __assert_fail ("llvm::all_of(P.SplitTails, [&](Slice *S) { return S->endOffset() <= MaxSplitSliceEndOffset; }) && \"Max split slice end offset is not actually the max!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 487, __PRETTY_FUNCTION__))
                          [&](Slice *S) {((llvm::all_of(P.SplitTails, [&](Slice *S) { return S->
endOffset() <= MaxSplitSliceEndOffset; }) && "Max split slice end offset is not actually the max!"
) ? static_cast<void> (0) : __assert_fail ("llvm::all_of(P.SplitTails, [&](Slice *S) { return S->endOffset() <= MaxSplitSliceEndOffset; }) && \"Max split slice end offset is not actually the max!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 487, __PRETTY_FUNCTION__))
                            return S->endOffset() <= MaxSplitSliceEndOffset;((llvm::all_of(P.SplitTails, [&](Slice *S) { return S->
endOffset() <= MaxSplitSliceEndOffset; }) && "Max split slice end offset is not actually the max!"
) ? static_cast<void> (0) : __assert_fail ("llvm::all_of(P.SplitTails, [&](Slice *S) { return S->endOffset() <= MaxSplitSliceEndOffset; }) && \"Max split slice end offset is not actually the max!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 487, __PRETTY_FUNCTION__))
                          }) &&((llvm::all_of(P.SplitTails, [&](Slice *S) { return S->
endOffset() <= MaxSplitSliceEndOffset; }) && "Max split slice end offset is not actually the max!"
) ? static_cast<void> (0) : __assert_fail ("llvm::all_of(P.SplitTails, [&](Slice *S) { return S->endOffset() <= MaxSplitSliceEndOffset; }) && \"Max split slice end offset is not actually the max!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 487, __PRETTY_FUNCTION__))
             "Max split slice end offset is not actually the max!")((llvm::all_of(P.SplitTails, [&](Slice *S) { return S->
endOffset() <= MaxSplitSliceEndOffset; }) && "Max split slice end offset is not actually the max!"
) ? static_cast<void> (0) : __assert_fail ("llvm::all_of(P.SplitTails, [&](Slice *S) { return S->endOffset() <= MaxSplitSliceEndOffset; }) && \"Max split slice end offset is not actually the max!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 487, __PRETTY_FUNCTION__));
    }
  }

  // If P.SI is already at the end, then we've cleared the split tail and
  // now have an end iterator.
  if (P.SI == SE) {
    assert(P.SplitTails.empty() && "Failed to clear the split slices!")((P.SplitTails.empty() && "Failed to clear the split slices!"
) ? static_cast<void> (0) : __assert_fail ("P.SplitTails.empty() && \"Failed to clear the split slices!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 494, __PRETTY_FUNCTION__));
    return;
  }

  // If we had a non-empty partition previously, set up the state for
  // subsequent partitions.
  if (P.SI != P.SJ) {
    // Accumulate all the splittable slices which started in the old
    // partition into the split list.
    for (Slice &S : P)
      if (S.isSplittable() && S.endOffset() > P.EndOffset) {
        P.SplitTails.push_back(&S);
        MaxSplitSliceEndOffset =
            std::max(S.endOffset(), MaxSplitSliceEndOffset);
      }

    // Start from the end of the previous partition.
    P.SI = P.SJ;

    // If P.SI is now at the end, we at most have a tail of split slices.
    if (P.SI == SE) {
      P.BeginOffset = P.EndOffset;
      P.EndOffset = MaxSplitSliceEndOffset;
      return;
    }

    // If the we have split slices and the next slice is after a gap and is
    // not splittable immediately form an empty partition for the split
    // slices up until the next slice begins.
    if (!P.SplitTails.empty() && P.SI->beginOffset() != P.EndOffset &&
        !P.SI->isSplittable()) {
      P.BeginOffset = P.EndOffset;
      P.EndOffset = P.SI->beginOffset();
      return;
    }
  }

  // OK, we need to consume new slices. Set the end offset based on the
  // current slice, and step SJ past it. The beginning offset of the
  // partition is the beginning offset of the next slice unless we have
  // pre-existing split slices that are continuing, in which case we begin
  // at the prior end offset.
  P.BeginOffset = P.SplitTails.empty() ? P.SI->beginOffset() : P.EndOffset;
  P.EndOffset = P.SI->endOffset();
  ++P.SJ;

  // There are two strategies to form a partition based on whether the
  // partition starts with an unsplittable slice or a splittable slice.
  if (!P.SI->isSplittable()) {
    // When we're forming an unsplittable region, it must always start at
    // the first slice and will extend through its end.
    assert(P.BeginOffset == P.SI->beginOffset())((P.BeginOffset == P.SI->beginOffset()) ? static_cast<void
> (0) : __assert_fail ("P.BeginOffset == P.SI->beginOffset()"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 545, __PRETTY_FUNCTION__));

    // Form a partition including all of the overlapping slices with this
    // unsplittable slice.
    while (P.SJ != SE && P.SJ->beginOffset() < P.EndOffset) {
      if (!P.SJ->isSplittable())
        P.EndOffset = std::max(P.EndOffset, P.SJ->endOffset());
      ++P.SJ;
    }

    // We have a partition across a set of overlapping unsplittable
    // partitions.
    return;
  }

  // If we're starting with a splittable slice, then we need to form
  // a synthetic partition spanning it and any other overlapping splittable
  // splices.
  assert(P.SI->isSplittable() && "Forming a splittable partition!")((P.SI->isSplittable() && "Forming a splittable partition!"
) ? static_cast<void> (0) : __assert_fail ("P.SI->isSplittable() && \"Forming a splittable partition!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 563, __PRETTY_FUNCTION__));

  // Collect all of the overlapping splittable slices.
  while (P.SJ != SE && P.SJ->beginOffset() < P.EndOffset &&
         P.SJ->isSplittable()) {
    P.EndOffset = std::max(P.EndOffset, P.SJ->endOffset());
    ++P.SJ;
  }

  // Back upiP.EndOffset if we ended the span early when encountering an
  // unsplittable slice. This synthesizes the early end offset of
  // a partition spanning only splittable slices.
  if (P.SJ != SE && P.SJ->beginOffset() < P.EndOffset) {
    assert(!P.SJ->isSplittable())((!P.SJ->isSplittable()) ? static_cast<void> (0) : __assert_fail
 ("!P.SJ->isSplittable()", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 576, __PRETTY_FUNCTION__));
    P.EndOffset = P.SJ->beginOffset();
  }
}

581public:
bool operator==(const partition_iterator &RHS) const {
  assert(SE == RHS.SE &&((SE == RHS.SE && "End iterators don't match between compared partition iterators!"
) ? static_cast<void> (0) : __assert_fail ("SE == RHS.SE && \"End iterators don't match between compared partition iterators!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 584, __PRETTY_FUNCTION__))
         "End iterators don't match between compared partition iterators!")((SE == RHS.SE && "End iterators don't match between compared partition iterators!"
) ? static_cast<void> (0) : __assert_fail ("SE == RHS.SE && \"End iterators don't match between compared partition iterators!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 584, __PRETTY_FUNCTION__));

  // The observed positions of partitions is marked by the P.SI iterator and
  // the emptiness of the split slices. The latter is only relevant when
  // P.SI == SE, as the end iterator will additionally have an empty split
  // slices list, but the prior may have the same P.SI and a tail of split
  // slices.
  if (P.SI == RHS.P.SI && P.SplitTails.empty() == RHS.P.SplitTails.empty()) {
    assert(P.SJ == RHS.P.SJ &&((P.SJ == RHS.P.SJ && "Same set of slices formed two different sized partitions!"
) ? static_cast<void> (0) : __assert_fail ("P.SJ == RHS.P.SJ && \"Same set of slices formed two different sized partitions!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 593, __PRETTY_FUNCTION__))
           "Same set of slices formed two different sized partitions!")((P.SJ == RHS.P.SJ && "Same set of slices formed two different sized partitions!"
) ? static_cast<void> (0) : __assert_fail ("P.SJ == RHS.P.SJ && \"Same set of slices formed two different sized partitions!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 593, __PRETTY_FUNCTION__));
    assert(P.SplitTails.size() == RHS.P.SplitTails.size() &&((P.SplitTails.size() == RHS.P.SplitTails.size() && "Same slice position with differently sized non-empty split "
 "slice tails!") ? static_cast<void> (0) : __assert_fail
 ("P.SplitTails.size() == RHS.P.SplitTails.size() && \"Same slice position with differently sized non-empty split \" \"slice tails!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 596, __PRETTY_FUNCTION__))
           "Same slice position with differently sized non-empty split "((P.SplitTails.size() == RHS.P.SplitTails.size() && "Same slice position with differently sized non-empty split "
 "slice tails!") ? static_cast<void> (0) : __assert_fail
 ("P.SplitTails.size() == RHS.P.SplitTails.size() && \"Same slice position with differently sized non-empty split \" \"slice tails!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 596, __PRETTY_FUNCTION__))
           "slice tails!")((P.SplitTails.size() == RHS.P.SplitTails.size() && "Same slice position with differently sized non-empty split "
 "slice tails!") ? static_cast<void> (0) : __assert_fail
 ("P.SplitTails.size() == RHS.P.SplitTails.size() && \"Same slice position with differently sized non-empty split \" \"slice tails!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 596, __PRETTY_FUNCTION__));
    return true;
  }
  return false;
}

partition_iterator &operator++() {
  advance();
  return *this;
}

Partition &operator*() { return P; }
608};

610/// A forward range over the partitions of the alloca's slices.
611///
612/// This accesses an iterator range over the partitions of the alloca's
613/// slices. It computes these partitions on the fly based on the overlapping
614/// offsets of the slices and the ability to split them. It will visit "empty"
615/// partitions to cover regions of the alloca only accessed via split
616/// slices.
617iterator_range<AllocaSlices::partition_iterator> AllocaSlices::partitions() {
return make_range(partition_iterator(begin(), end()),
                  partition_iterator(end(), end()));
620}

622static Value *foldSelectInst(SelectInst &SI) {
// If the condition being selected on is a constant or the same value is
// being selected between, fold the select. Yes this does (rarely) happen
// early on.
if (ConstantInt *CI = dyn_cast<ConstantInt>(SI.getCondition()))
  return SI.getOperand(1 + CI->isZero());
if (SI.getOperand(1) == SI.getOperand(2))
  return SI.getOperand(1);

return nullptr;
632}

634/// A helper that folds a PHI node or a select.
635static Value *foldPHINodeOrSelectInst(Instruction &I) {
if (PHINode *PN = dyn_cast<PHINode>(&I)) {
  // If PN merges together the same value, return that value.
  return PN->hasConstantValue();
}
return foldSelectInst(cast<SelectInst>(I));
641}

643/// Builder for the alloca slices.
644///
645/// This class builds a set of alloca slices by recursively visiting the uses
646/// of an alloca and making a slice for each load and store at each offset.
647class AllocaSlices::SliceBuilder : public PtrUseVisitor<SliceBuilder> {
friend class PtrUseVisitor<SliceBuilder>;
friend class InstVisitor<SliceBuilder>;

using Base = PtrUseVisitor<SliceBuilder>;

const uint64_t AllocSize;
AllocaSlices &AS;

SmallDenseMap<Instruction *, unsigned> MemTransferSliceMap;
SmallDenseMap<Instruction *, uint64_t> PHIOrSelectSizes;

/// Set to de-duplicate dead instructions found in the use walk.
SmallPtrSet<Instruction *, 4> VisitedDeadInsts;

662public:
SliceBuilder(const DataLayout &DL, AllocaInst &AI, AllocaSlices &AS)
    : PtrUseVisitor<SliceBuilder>(DL),
      AllocSize(DL.getTypeAllocSize(AI.getAllocatedType())), AS(AS) {}

667private:
void markAsDead(Instruction &I) {
  if (VisitedDeadInsts.insert(&I).second)
    AS.DeadUsers.push_back(&I);
}

void insertUse(Instruction &I, const APInt &Offset, uint64_t Size,
               bool IsSplittable = false) {
  // Completely skip uses which have a zero size or start either before or
  // past the end of the allocation.
  if (Size == 0 || Offset.uge(AllocSize)) {
    LLVM_DEBUG(dbgs() << "WARNING: Ignoring " << Size << " byte use @"do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "WARNING: Ignoring " << Size
 << " byte use @" << Offset << " which has zero size or starts outside of the "
 << AllocSize << " byte alloca:\n" << "    alloca: "
 << AS.AI << "\n" << "       use: " <<
 I << "\n"; } } while (false)
                      << Offsetdo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "WARNING: Ignoring " << Size
 << " byte use @" << Offset << " which has zero size or starts outside of the "
 << AllocSize << " byte alloca:\n" << "    alloca: "
 << AS.AI << "\n" << "       use: " <<
 I << "\n"; } } while (false)
                      << " which has zero size or starts outside of the "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "WARNING: Ignoring " << Size
 << " byte use @" << Offset << " which has zero size or starts outside of the "
 << AllocSize << " byte alloca:\n" << "    alloca: "
 << AS.AI << "\n" << "       use: " <<
 I << "\n"; } } while (false)
                      << AllocSize << " byte alloca:\n"do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "WARNING: Ignoring " << Size
 << " byte use @" << Offset << " which has zero size or starts outside of the "
 << AllocSize << " byte alloca:\n" << "    alloca: "
 << AS.AI << "\n" << "       use: " <<
 I << "\n"; } } while (false)
                      << "    alloca: " << AS.AI << "\n"do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "WARNING: Ignoring " << Size
 << " byte use @" << Offset << " which has zero size or starts outside of the "
 << AllocSize << " byte alloca:\n" << "    alloca: "
 << AS.AI << "\n" << "       use: " <<
 I << "\n"; } } while (false)
                      << "       use: " << I << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "WARNING: Ignoring " << Size
 << " byte use @" << Offset << " which has zero size or starts outside of the "
 << AllocSize << " byte alloca:\n" << "    alloca: "
 << AS.AI << "\n" << "       use: " <<
 I << "\n"; } } while (false);
    return markAsDead(I);
  }

  uint64_t BeginOffset = Offset.getZExtValue();
  uint64_t EndOffset = BeginOffset + Size;

  // Clamp the end offset to the end of the allocation. Note that this is
  // formulated to handle even the case where "BeginOffset + Size" overflows.
  // This may appear superficially to be something we could ignore entirely,
  // but that is not so! There may be widened loads or PHI-node uses where
  // some instructions are dead but not others. We can't completely ignore
  // them, and so have to record at least the information here.
  assert(AllocSize >= BeginOffset)((AllocSize >= BeginOffset) ? static_cast<void> (0) :
 __assert_fail ("AllocSize >= BeginOffset", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 696, __PRETTY_FUNCTION__)); // Established above.
  if (Size > AllocSize - BeginOffset) {
    LLVM_DEBUG(dbgs() << "WARNING: Clamping a " << Size << " byte use @"do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "WARNING: Clamping a " << Size
 << " byte use @" << Offset << " to remain within the "
 << AllocSize << " byte alloca:\n" << "    alloca: "
 << AS.AI << "\n" << "       use: " <<
 I << "\n"; } } while (false)
                      << Offset << " to remain within the " << AllocSizedo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "WARNING: Clamping a " << Size
 << " byte use @" << Offset << " to remain within the "
 << AllocSize << " byte alloca:\n" << "    alloca: "
 << AS.AI << "\n" << "       use: " <<
 I << "\n"; } } while (false)
                      << " byte alloca:\n"do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "WARNING: Clamping a " << Size
 << " byte use @" << Offset << " to remain within the "
 << AllocSize << " byte alloca:\n" << "    alloca: "
 << AS.AI << "\n" << "       use: " <<
 I << "\n"; } } while (false)
                      << "    alloca: " << AS.AI << "\n"do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "WARNING: Clamping a " << Size
 << " byte use @" << Offset << " to remain within the "
 << AllocSize << " byte alloca:\n" << "    alloca: "
 << AS.AI << "\n" << "       use: " <<
 I << "\n"; } } while (false)
                      << "       use: " << I << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "WARNING: Clamping a " << Size
 << " byte use @" << Offset << " to remain within the "
 << AllocSize << " byte alloca:\n" << "    alloca: "
 << AS.AI << "\n" << "       use: " <<
 I << "\n"; } } while (false);
    EndOffset = AllocSize;
  }

  AS.Slices.push_back(Slice(BeginOffset, EndOffset, U, IsSplittable));
}

void visitBitCastInst(BitCastInst &BC) {
  if (BC.use_empty())
    return markAsDead(BC);

  return Base::visitBitCastInst(BC);
}

void visitAddrSpaceCastInst(AddrSpaceCastInst &ASC) {
  if (ASC.use_empty())
    return markAsDead(ASC);

  return Base::visitAddrSpaceCastInst(ASC);
}

void visitGetElementPtrInst(GetElementPtrInst &GEPI) {
  if (GEPI.use_empty())
    return markAsDead(GEPI);

  if (SROAStrictInbounds && GEPI.isInBounds()) {
    // FIXME: This is a manually un-factored variant of the basic code inside
    // of GEPs with checking of the inbounds invariant specified in the
    // langref in a very strict sense. If we ever want to enable
    // SROAStrictInbounds, this code should be factored cleanly into
    // PtrUseVisitor, but it is easier to experiment with SROAStrictInbounds
    // by writing out the code here where we have the underlying allocation
    // size readily available.
    APInt GEPOffset = Offset;
    const DataLayout &DL = GEPI.getModule()->getDataLayout();
    for (gep_type_iterator GTI = gep_type_begin(GEPI),
                           GTE = gep_type_end(GEPI);
         GTI != GTE; ++GTI) {
      ConstantInt *OpC = dyn_cast<ConstantInt>(GTI.getOperand());
      if (!OpC)
        break;

      // Handle a struct index, which adds its field offset to the pointer.
      if (StructType *STy = GTI.getStructTypeOrNull()) {
        unsigned ElementIdx = OpC->getZExtValue();
        const StructLayout *SL = DL.getStructLayout(STy);
        GEPOffset +=
            APInt(Offset.getBitWidth(), SL->getElementOffset(ElementIdx));
      } else {
        // For array or vector indices, scale the index by the size of the
        // type.
        APInt Index = OpC->getValue().sextOrTrunc(Offset.getBitWidth());
        GEPOffset += Index * APInt(Offset.getBitWidth(),
                                   DL.getTypeAllocSize(GTI.getIndexedType()));
      }

      // If this index has computed an intermediate pointer which is not
      // inbounds, then the result of the GEP is a poison value and we can
      // delete it and all uses.
      if (GEPOffset.ugt(AllocSize))
        return markAsDead(GEPI);
    }
  }

  return Base::visitGetElementPtrInst(GEPI);
}

void handleLoadOrStore(Type *Ty, Instruction &I, const APInt &Offset,
                       uint64_t Size, bool IsVolatile) {
  // We allow splitting of non-volatile loads and stores where the type is an
  // integer type. These may be used to implement 'memcpy' or other "transfer
  // of bits" patterns.
  bool IsSplittable = Ty->isIntegerTy() && !IsVolatile;

  insertUse(I, Offset, Size, IsSplittable);
}

void visitLoadInst(LoadInst &LI) {
  assert((!LI.isSimple() || LI.getType()->isSingleValueType()) &&(((!LI.isSimple() || LI.getType()->isSingleValueType()) &&
 "All simple FCA loads should have been pre-split") ? static_cast
<void> (0) : __assert_fail ("(!LI.isSimple() || LI.getType()->isSingleValueType()) && \"All simple FCA loads should have been pre-split\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 781, __PRETTY_FUNCTION__))
         "All simple FCA loads should have been pre-split")(((!LI.isSimple() || LI.getType()->isSingleValueType()) &&
 "All simple FCA loads should have been pre-split") ? static_cast
<void> (0) : __assert_fail ("(!LI.isSimple() || LI.getType()->isSingleValueType()) && \"All simple FCA loads should have been pre-split\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 781, __PRETTY_FUNCTION__));

  if (!IsOffsetKnown)
    return PI.setAborted(&LI);

  if (LI.isVolatile() &&
      LI.getPointerAddressSpace() != DL.getAllocaAddrSpace())
    return PI.setAborted(&LI);

  uint64_t Size = DL.getTypeStoreSize(LI.getType());
  return handleLoadOrStore(LI.getType(), LI, Offset, Size, LI.isVolatile());
}

void visitStoreInst(StoreInst &SI) {
  Value *ValOp = SI.getValueOperand();
  if (ValOp == *U)
    return PI.setEscapedAndAborted(&SI);
  if (!IsOffsetKnown)
    return PI.setAborted(&SI);

  if (SI.isVolatile() &&
      SI.getPointerAddressSpace() != DL.getAllocaAddrSpace())
    return PI.setAborted(&SI);

  uint64_t Size = DL.getTypeStoreSize(ValOp->getType());

  // If this memory access can be shown to *statically* extend outside the
  // bounds of the allocation, it's behavior is undefined, so simply
  // ignore it. Note that this is more strict than the generic clamping
  // behavior of insertUse. We also try to handle cases which might run the
  // risk of overflow.
  // FIXME: We should instead consider the pointer to have escaped if this
  // function is being instrumented for addressing bugs or race conditions.
  if (Size > AllocSize || Offset.ugt(AllocSize - Size)) {
    LLVM_DEBUG(dbgs() << "WARNING: Ignoring " << Size << " byte store @"do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "WARNING: Ignoring " << Size
 << " byte store @" << Offset << " which extends past the end of the "
 << AllocSize << " byte alloca:\n" << "    alloca: "
 << AS.AI << "\n" << "       use: " <<
 SI << "\n"; } } while (false)
                      << Offset << " which extends past the end of the "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "WARNING: Ignoring " << Size
 << " byte store @" << Offset << " which extends past the end of the "
 << AllocSize << " byte alloca:\n" << "    alloca: "
 << AS.AI << "\n" << "       use: " <<
 SI << "\n"; } } while (false)
                      << AllocSize << " byte alloca:\n"do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "WARNING: Ignoring " << Size
 << " byte store @" << Offset << " which extends past the end of the "
 << AllocSize << " byte alloca:\n" << "    alloca: "
 << AS.AI << "\n" << "       use: " <<
 SI << "\n"; } } while (false)
                      << "    alloca: " << AS.AI << "\n"do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "WARNING: Ignoring " << Size
 << " byte store @" << Offset << " which extends past the end of the "
 << AllocSize << " byte alloca:\n" << "    alloca: "
 << AS.AI << "\n" << "       use: " <<
 SI << "\n"; } } while (false)
                      << "       use: " << SI << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "WARNING: Ignoring " << Size
 << " byte store @" << Offset << " which extends past the end of the "
 << AllocSize << " byte alloca:\n" << "    alloca: "
 << AS.AI << "\n" << "       use: " <<
 SI << "\n"; } } while (false);
    return markAsDead(SI);
  }

  assert((!SI.isSimple() || ValOp->getType()->isSingleValueType()) &&(((!SI.isSimple() || ValOp->getType()->isSingleValueType
()) && "All simple FCA stores should have been pre-split"
) ? static_cast<void> (0) : __assert_fail ("(!SI.isSimple() || ValOp->getType()->isSingleValueType()) && \"All simple FCA stores should have been pre-split\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 824, __PRETTY_FUNCTION__))
         "All simple FCA stores should have been pre-split")(((!SI.isSimple() || ValOp->getType()->isSingleValueType
()) && "All simple FCA stores should have been pre-split"
) ? static_cast<void> (0) : __assert_fail ("(!SI.isSimple() || ValOp->getType()->isSingleValueType()) && \"All simple FCA stores should have been pre-split\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 824, __PRETTY_FUNCTION__));
  handleLoadOrStore(ValOp->getType(), SI, Offset, Size, SI.isVolatile());
}

void visitMemSetInst(MemSetInst &II) {
  assert(II.getRawDest() == *U && "Pointer use is not the destination?")((II.getRawDest() == *U && "Pointer use is not the destination?"
) ? static_cast<void> (0) : __assert_fail ("II.getRawDest() == *U && \"Pointer use is not the destination?\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 829, __PRETTY_FUNCTION__));
  ConstantInt *Length = dyn_cast<ConstantInt>(II.getLength());
  if ((Length && Length->getValue() == 0) ||
      (IsOffsetKnown && Offset.uge(AllocSize)))
    // Zero-length mem transfer intrinsics can be ignored entirely.
    return markAsDead(II);

  if (!IsOffsetKnown)
    return PI.setAborted(&II);

  // Don't replace this with a store with a different address space.  TODO:
  // Use a store with the casted new alloca?
  if (II.isVolatile() && II.getDestAddressSpace() != DL.getAllocaAddrSpace())
    return PI.setAborted(&II);

  insertUse(II, Offset, Length ? Length->getLimitedValue()
                               : AllocSize - Offset.getLimitedValue(),
            (bool)Length);
}

void visitMemTransferInst(MemTransferInst &II) {
  ConstantInt *Length = dyn_cast<ConstantInt>(II.getLength());
  if (Length && Length->getValue() == 0)
    // Zero-length mem transfer intrinsics can be ignored entirely.
    return markAsDead(II);

  // Because we can visit these intrinsics twice, also check to see if the
  // first time marked this instruction as dead. If so, skip it.
  if (VisitedDeadInsts.count(&II))
    return;

  if (!IsOffsetKnown)
    return PI.setAborted(&II);

  // Don't replace this with a load/store with a different address space.
  // TODO: Use a store with the casted new alloca?
  if (II.isVolatile() &&
      (II.getDestAddressSpace() != DL.getAllocaAddrSpace() ||
       II.getSourceAddressSpace() != DL.getAllocaAddrSpace()))
    return PI.setAborted(&II);

  // This side of the transfer is completely out-of-bounds, and so we can
  // nuke the entire transfer. However, we also need to nuke the other side
  // if already added to our partitions.
  // FIXME: Yet another place we really should bypass this when
  // instrumenting for ASan.
  if (Offset.uge(AllocSize)) {
    SmallDenseMap<Instruction *, unsigned>::iterator MTPI =
        MemTransferSliceMap.find(&II);
    if (MTPI != MemTransferSliceMap.end())
      AS.Slices[MTPI->second].kill();
    return markAsDead(II);
  }

  uint64_t RawOffset = Offset.getLimitedValue();
  uint64_t Size = Length ? Length->getLimitedValue() : AllocSize - RawOffset;

  // Check for the special case where the same exact value is used for both
  // source and dest.
  if (*U == II.getRawDest() && *U == II.getRawSource()) {
    // For non-volatile transfers this is a no-op.
    if (!II.isVolatile())
      return markAsDead(II);

    return insertUse(II, Offset, Size, /*IsSplittable=*/false);
  }

  // If we have seen both source and destination for a mem transfer, then
  // they both point to the same alloca.
  bool Inserted;
  SmallDenseMap<Instruction *, unsigned>::iterator MTPI;
  std::tie(MTPI, Inserted) =
      MemTransferSliceMap.insert(std::make_pair(&II, AS.Slices.size()));
  unsigned PrevIdx = MTPI->second;
  if (!Inserted) {
    Slice &PrevP = AS.Slices[PrevIdx];

    // Check if the begin offsets match and this is a non-volatile transfer.
    // In that case, we can completely elide the transfer.
    if (!II.isVolatile() && PrevP.beginOffset() == RawOffset) {
      PrevP.kill();
      return markAsDead(II);
    }

    // Otherwise we have an offset transfer within the same alloca. We can't
    // split those.
    PrevP.makeUnsplittable();
  }

  // Insert the use now that we've fixed up the splittable nature.
  insertUse(II, Offset, Size, /*IsSplittable=*/Inserted && Length);

  // Check that we ended up with a valid index in the map.
  assert(AS.Slices[PrevIdx].getUse()->getUser() == &II &&((AS.Slices[PrevIdx].getUse()->getUser() == &II &&
 "Map index doesn't point back to a slice with this user.") ?
 static_cast<void> (0) : __assert_fail ("AS.Slices[PrevIdx].getUse()->getUser() == &II && \"Map index doesn't point back to a slice with this user.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 923, __PRETTY_FUNCTION__))
         "Map index doesn't point back to a slice with this user.")((AS.Slices[PrevIdx].getUse()->getUser() == &II &&
 "Map index doesn't point back to a slice with this user.") ?
 static_cast<void> (0) : __assert_fail ("AS.Slices[PrevIdx].getUse()->getUser() == &II && \"Map index doesn't point back to a slice with this user.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 923, __PRETTY_FUNCTION__));
}

// Disable SRoA for any intrinsics except for lifetime invariants.
// FIXME: What about debug intrinsics? This matches old behavior, but
// doesn't make sense.
void visitIntrinsicInst(IntrinsicInst &II) {
  if (!IsOffsetKnown)
    return PI.setAborted(&II);

  if (II.isLifetimeStartOrEnd()) {
    ConstantInt *Length = cast<ConstantInt>(II.getArgOperand(0));
    uint64_t Size = std::min(AllocSize - Offset.getLimitedValue(),
                             Length->getLimitedValue());
    insertUse(II, Offset, Size, true);
    return;
  }

  Base::visitIntrinsicInst(II);
}

Instruction *hasUnsafePHIOrSelectUse(Instruction *Root, uint64_t &Size) {
  // We consider any PHI or select that results in a direct load or store of
  // the same offset to be a viable use for slicing purposes. These uses
  // are considered unsplittable and the size is the maximum loaded or stored
  // size.
  SmallPtrSet<Instruction *, 4> Visited;
  SmallVector<std::pair<Instruction *, Instruction *>, 4> Uses;
  Visited.insert(Root);
  Uses.push_back(std::make_pair(cast<Instruction>(*U), Root));
  const DataLayout &DL = Root->getModule()->getDataLayout();
  // If there are no loads or stores, the access is dead. We mark that as
  // a size zero access.
  Size = 0;
  do {
    Instruction *I, *UsedI;
    std::tie(UsedI, I) = Uses.pop_back_val();

    if (LoadInst *LI = dyn_cast<LoadInst>(I)) {
      Size = std::max(Size,
                      DL.getTypeStoreSize(LI->getType()).getFixedSize());
      continue;
    }
    if (StoreInst *SI = dyn_cast<StoreInst>(I)) {
      Value *Op = SI->getOperand(0);
      if (Op == UsedI)
        return SI;
      Size = std::max(Size,
                      DL.getTypeStoreSize(Op->getType()).getFixedSize());
      continue;
    }

    if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(I)) {
      if (!GEP->hasAllZeroIndices())
        return GEP;
    } else if (!isa<BitCastInst>(I) && !isa<PHINode>(I) &&
               !isa<SelectInst>(I) && !isa<AddrSpaceCastInst>(I)) {
      return I;
    }

    for (User *U : I->users())
      if (Visited.insert(cast<Instruction>(U)).second)
        Uses.push_back(std::make_pair(I, cast<Instruction>(U)));
  } while (!Uses.empty());

  return nullptr;
}

void visitPHINodeOrSelectInst(Instruction &I) {
  assert(isa<PHINode>(I) || isa<SelectInst>(I))((isa<PHINode>(I) || isa<SelectInst>(I)) ? static_cast
<void> (0) : __assert_fail ("isa<PHINode>(I) || isa<SelectInst>(I)"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 992, __PRETTY_FUNCTION__));
  if (I.use_empty())
    return markAsDead(I);

  // TODO: We could use SimplifyInstruction here to fold PHINodes and
  // SelectInsts. However, doing so requires to change the current
  // dead-operand-tracking mechanism. For instance, suppose neither loading
  // from %U nor %other traps. Then "load (select undef, %U, %other)" does not
  // trap either.  However, if we simply replace %U with undef using the
  // current dead-operand-tracking mechanism, "load (select undef, undef,
  // %other)" may trap because the select may return the first operand
  // "undef".
  if (Value *Result = foldPHINodeOrSelectInst(I)) {
    if (Result == *U)
      // If the result of the constant fold will be the pointer, recurse
      // through the PHI/select as if we had RAUW'ed it.
      enqueueUsers(I);
    else
      // Otherwise the operand to the PHI/select is dead, and we can replace
      // it with undef.
      AS.DeadOperands.push_back(U);

    return;
  }

  if (!IsOffsetKnown)
    return PI.setAborted(&I);

  // See if we already have computed info on this node.
  uint64_t &Size = PHIOrSelectSizes[&I];
  if (!Size) {
    // This is a new PHI/Select, check for an unsafe use of it.
    if (Instruction *UnsafeI = hasUnsafePHIOrSelectUse(&I, Size))
      return PI.setAborted(UnsafeI);
  }

  // For PHI and select operands outside the alloca, we can't nuke the entire
  // phi or select -- the other side might still be relevant, so we special
  // case them here and use a separate structure to track the operands
  // themselves which should be replaced with undef.
  // FIXME: This should instead be escaped in the event we're instrumenting
  // for address sanitization.
  if (Offset.uge(AllocSize)) {
    AS.DeadOperands.push_back(U);
    return;
  }

  insertUse(I, Offset, Size);
}

void visitPHINode(PHINode &PN) { visitPHINodeOrSelectInst(PN); }

void visitSelectInst(SelectInst &SI) { visitPHINodeOrSelectInst(SI); }

/// Disable SROA entirely if there are unhandled users of the alloca.
void visitInstruction(Instruction &I) { PI.setAborted(&I); }
1048};

1050AllocaSlices::AllocaSlices(const DataLayout &DL, AllocaInst &AI)
  :
1052#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
    AI(AI),
1054#endif
    PointerEscapingInstr(nullptr) {
SliceBuilder PB(DL, AI, *this);
SliceBuilder::PtrInfo PtrI = PB.visitPtr(AI);
if (PtrI.isEscaped() || PtrI.isAborted()) {
  // FIXME: We should sink the escape vs. abort info into the caller nicely,
  // possibly by just storing the PtrInfo in the AllocaSlices.
  PointerEscapingInstr = PtrI.getEscapingInst() ? PtrI.getEscapingInst()
                                                : PtrI.getAbortingInst();
  assert(PointerEscapingInstr && "Did not track a bad instruction")((PointerEscapingInstr && "Did not track a bad instruction"
) ? static_cast<void> (0) : __assert_fail ("PointerEscapingInstr && \"Did not track a bad instruction\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1063, __PRETTY_FUNCTION__));
  return;
}

Slices.erase(
    llvm::remove_if(Slices, [](const Slice &S) { return S.isDead(); }),
    Slices.end());

1071#ifndef NDEBUG
if (SROARandomShuffleSlices) {
  std::mt19937 MT(static_cast<unsigned>(
      std::chrono::system_clock::now().time_since_epoch().count()));
  std::shuffle(Slices.begin(), Slices.end(), MT);
}
1077#endif

// Sort the uses. This arranges for the offsets to be in ascending order,
// and the sizes to be in descending order.
llvm::sort(Slices);
1082}

1084#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)

1086void AllocaSlices::print(raw_ostream &OS, const_iterator I,
                       StringRef Indent) const {
printSlice(OS, I, Indent);
OS << "\n";
printUse(OS, I, Indent);
1091}

1093void AllocaSlices::printSlice(raw_ostream &OS, const_iterator I,
                            StringRef Indent) const {
OS << Indent << "[" << I->beginOffset() << "," << I->endOffset() << ")"
   << " slice #" << (I - begin())
   << (I->isSplittable() ? " (splittable)" : "");
1098}

1100void AllocaSlices::printUse(raw_ostream &OS, const_iterator I,
                          StringRef Indent) const {
OS << Indent << "  used by: " << *I->getUse()->getUser() << "\n";
1103}

1105void AllocaSlices::print(raw_ostream &OS) const {
if (PointerEscapingInstr) {
  OS << "Can't analyze slices for alloca: " << AI << "\n"
     << "  A pointer to this alloca escaped by:\n"
     << "  " << *PointerEscapingInstr << "\n";
  return;
}

OS << "Slices of alloca: " << AI << "\n";
for (const_iterator I = begin(), E = end(); I != E; ++I)
  print(OS, I);
1116}

1118LLVM_DUMP_METHOD__attribute__((noinline)) __attribute__((__used__)) void AllocaSlices::dump(const_iterator I) const {
print(dbgs(), I);
1120}
1121LLVM_DUMP_METHOD__attribute__((noinline)) __attribute__((__used__)) void AllocaSlices::dump() const { print(dbgs()); }

1123#endif // !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)

1125/// Walk the range of a partitioning looking for a common type to cover this
1126/// sequence of slices.
1127static Type *findCommonType(AllocaSlices::const_iterator B,
                          AllocaSlices::const_iterator E,
                          uint64_t EndOffset) {
Type *Ty = nullptr;
bool TyIsCommon = true;
IntegerType *ITy = nullptr;

// Note that we need to look at *every* alloca slice's Use to ensure we
// always get consistent results regardless of the order of slices.
for (AllocaSlices::const_iterator I = B; I != E; ++I) {
  Use *U = I->getUse();
  if (isa<IntrinsicInst>(*U->getUser()))
    continue;
  if (I->beginOffset() != B->beginOffset() || I->endOffset() != EndOffset)
    continue;

  Type *UserTy = nullptr;
  if (LoadInst *LI = dyn_cast<LoadInst>(U->getUser())) {
    UserTy = LI->getType();
  } else if (StoreInst *SI = dyn_cast<StoreInst>(U->getUser())) {
    UserTy = SI->getValueOperand()->getType();
  }

  if (IntegerType *UserITy = dyn_cast_or_null<IntegerType>(UserTy)) {
    // If the type is larger than the partition, skip it. We only encounter
    // this for split integer operations where we want to use the type of the
    // entity causing the split. Also skip if the type is not a byte width
    // multiple.
    if (UserITy->getBitWidth() % 8 != 0 ||
        UserITy->getBitWidth() / 8 > (EndOffset - B->beginOffset()))
      continue;

    // Track the largest bitwidth integer type used in this way in case there
    // is no common type.
    if (!ITy || ITy->getBitWidth() < UserITy->getBitWidth())
      ITy = UserITy;
  }

  // To avoid depending on the order of slices, Ty and TyIsCommon must not
  // depend on types skipped above.
  if (!UserTy || (Ty && Ty != UserTy))
    TyIsCommon = false; // Give up on anything but an iN type.
  else
    Ty = UserTy;
}

return TyIsCommon ? Ty : ITy;
1174}

1176/// PHI instructions that use an alloca and are subsequently loaded can be
1177/// rewritten to load both input pointers in the pred blocks and then PHI the
1178/// results, allowing the load of the alloca to be promoted.
1179/// From this:
1180///   %P2 = phi [i32* %Alloca, i32* %Other]
1181///   %V = load i32* %P2
1182/// to:
1183///   %V1 = load i32* %Alloca      -> will be mem2reg'd
1184///   ...
1185///   %V2 = load i32* %Other
1186///   ...
1187///   %V = phi [i32 %V1, i32 %V2]
1188///
1189/// We can do this to a select if its only uses are loads and if the operands
1190/// to the select can be loaded unconditionally.
1191///
1192/// FIXME: This should be hoisted into a generic utility, likely in
1193/// Transforms/Util/Local.h
1194static bool isSafePHIToSpeculate(PHINode &PN) {
const DataLayout &DL = PN.getModule()->getDataLayout();

// For now, we can only do this promotion if the load is in the same block
// as the PHI, and if there are no stores between the phi and load.
// TODO: Allow recursive phi users.
// TODO: Allow stores.
BasicBlock *BB = PN.getParent();
MaybeAlign MaxAlign;
uint64_t APWidth = DL.getIndexTypeSizeInBits(PN.getType());
APInt MaxSize(APWidth, 0);
bool HaveLoad = false;
for (User *U : PN.users()) {
  LoadInst *LI = dyn_cast<LoadInst>(U);
  if (!LI || !LI->isSimple())
    return false;

  // For now we only allow loads in the same block as the PHI.  This is
  // a common case that happens when instcombine merges two loads through
  // a PHI.
  if (LI->getParent() != BB)
    return false;

  // Ensure that there are no instructions between the PHI and the load that
  // could store.
  for (BasicBlock::iterator BBI(PN); &*BBI != LI; ++BBI)
    if (BBI->mayWriteToMemory())
      return false;

  uint64_t Size = DL.getTypeStoreSize(LI->getType());
  MaxAlign = std::max(MaxAlign, MaybeAlign(LI->getAlignment()));
  MaxSize = MaxSize.ult(Size) ? APInt(APWidth, Size) : MaxSize;
  HaveLoad = true;
}

if (!HaveLoad)
  return false;

// We can only transform this if it is safe to push the loads into the
// predecessor blocks. The only thing to watch out for is that we can't put
// a possibly trapping load in the predecessor if it is a critical edge.
for (unsigned Idx = 0, Num = PN.getNumIncomingValues(); Idx != Num; ++Idx) {
  Instruction *TI = PN.getIncomingBlock(Idx)->getTerminator();
  Value *InVal = PN.getIncomingValue(Idx);

  // If the value is produced by the terminator of the predecessor (an
  // invoke) or it has side-effects, there is no valid place to put a load
  // in the predecessor.
  if (TI == InVal || TI->mayHaveSideEffects())
    return false;

  // If the predecessor has a single successor, then the edge isn't
  // critical.
  if (TI->getNumSuccessors() == 1)
    continue;

  // If this pointer is always safe to load, or if we can prove that there
  // is already a load in the block, then we can move the load to the pred
  // block.
  if (isSafeToLoadUnconditionally(InVal, MaxAlign, MaxSize, DL, TI))
    continue;

  return false;
}

return true;
1260}

1262static void speculatePHINodeLoads(PHINode &PN) {
LLVM_DEBUG(dbgs() << "    original: " << PN << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    original: " << PN <<
 "\n"; } } while (false);

LoadInst *SomeLoad = cast<LoadInst>(PN.user_back());
Type *LoadTy = SomeLoad->getType();
IRBuilderTy PHIBuilder(&PN);
PHINode *NewPN = PHIBuilder.CreatePHI(LoadTy, PN.getNumIncomingValues(),
                                      PN.getName() + ".sroa.speculated");

// Get the AA tags and alignment to use from one of the loads. It does not
// matter which one we get and if any differ.
AAMDNodes AATags;
SomeLoad->getAAMetadata(AATags);
const MaybeAlign Align = MaybeAlign(SomeLoad->getAlignment());

// Rewrite all loads of the PN to use the new PHI.
while (!PN.use_empty()) {
  LoadInst *LI = cast<LoadInst>(PN.user_back());
  LI->replaceAllUsesWith(NewPN);
  LI->eraseFromParent();
}

// Inject loads into all of the pred blocks.
DenseMap<BasicBlock*, Value*> InjectedLoads;
for (unsigned Idx = 0, Num = PN.getNumIncomingValues(); Idx != Num; ++Idx) {
  BasicBlock *Pred = PN.getIncomingBlock(Idx);
  Value *InVal = PN.getIncomingValue(Idx);

  // A PHI node is allowed to have multiple (duplicated) entries for the same
  // basic block, as long as the value is the same. So if we already injected
  // a load in the predecessor, then we should reuse the same load for all
  // duplicated entries.
  if (Value* V = InjectedLoads.lookup(Pred)) {
    NewPN->addIncoming(V, Pred);
    continue;
  }

  Instruction *TI = Pred->getTerminator();
  IRBuilderTy PredBuilder(TI);

  LoadInst *Load = PredBuilder.CreateLoad(
      LoadTy, InVal,
      (PN.getName() + ".sroa.speculate.load." + Pred->getName()));
  ++NumLoadsSpeculated;
  Load->setAlignment(Align);
  if (AATags)
    Load->setAAMetadata(AATags);
  NewPN->addIncoming(Load, Pred);
  InjectedLoads[Pred] = Load;
}

LLVM_DEBUG(dbgs() << "          speculated to: " << *NewPN << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "          speculated to: " <<
 *NewPN << "\n"; } } while (false);
PN.eraseFromParent();
1315}

1317/// Select instructions that use an alloca and are subsequently loaded can be
1318/// rewritten to load both input pointers and then select between the result,
1319/// allowing the load of the alloca to be promoted.
1320/// From this:
1321///   %P2 = select i1 %cond, i32* %Alloca, i32* %Other
1322///   %V = load i32* %P2
1323/// to:
1324///   %V1 = load i32* %Alloca      -> will be mem2reg'd
1325///   %V2 = load i32* %Other
1326///   %V = select i1 %cond, i32 %V1, i32 %V2
1327///
1328/// We can do this to a select if its only uses are loads and if the operand
1329/// to the select can be loaded unconditionally.
1330static bool isSafeSelectToSpeculate(SelectInst &SI) {
Value *TValue = SI.getTrueValue();
Value *FValue = SI.getFalseValue();
const DataLayout &DL = SI.getModule()->getDataLayout();

for (User *U : SI.users()) {
  LoadInst *LI = dyn_cast<LoadInst>(U);
  if (!LI || !LI->isSimple())
    return false;

  // Both operands to the select need to be dereferenceable, either
  // absolutely (e.g. allocas) or at this point because we can see other
  // accesses to it.
  if (!isSafeToLoadUnconditionally(TValue, LI->getType(),
                                   MaybeAlign(LI->getAlignment()), DL, LI))
    return false;
  if (!isSafeToLoadUnconditionally(FValue, LI->getType(),
                                   MaybeAlign(LI->getAlignment()), DL, LI))
    return false;
}

return true;
1352}

1354static void speculateSelectInstLoads(SelectInst &SI) {
LLVM_DEBUG(dbgs() << "    original: " << SI << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    original: " << SI <<
 "\n"; } } while (false);

IRBuilderTy IRB(&SI);
Value *TV = SI.getTrueValue();
Value *FV = SI.getFalseValue();
// Replace the loads of the select with a select of two loads.
while (!SI.use_empty()) {
  LoadInst *LI = cast<LoadInst>(SI.user_back());
  assert(LI->isSimple() && "We only speculate simple loads")((LI->isSimple() && "We only speculate simple loads"
) ? static_cast<void> (0) : __assert_fail ("LI->isSimple() && \"We only speculate simple loads\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1363, __PRETTY_FUNCTION__));

  IRB.SetInsertPoint(LI);
  LoadInst *TL = IRB.CreateLoad(LI->getType(), TV,
                                LI->getName() + ".sroa.speculate.load.true");
  LoadInst *FL = IRB.CreateLoad(LI->getType(), FV,
                                LI->getName() + ".sroa.speculate.load.false");
  NumLoadsSpeculated += 2;

  // Transfer alignment and AA info if present.
  TL->setAlignment(MaybeAlign(LI->getAlignment()));
  FL->setAlignment(MaybeAlign(LI->getAlignment()));

  AAMDNodes Tags;
  LI->getAAMetadata(Tags);
  if (Tags) {
    TL->setAAMetadata(Tags);
    FL->setAAMetadata(Tags);
  }

  Value *V = IRB.CreateSelect(SI.getCondition(), TL, FL,
                              LI->getName() + ".sroa.speculated");

  LLVM_DEBUG(dbgs() << "          speculated to: " << *V << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "          speculated to: " <<
 *V << "\n"; } } while (false);
  LI->replaceAllUsesWith(V);
  LI->eraseFromParent();
}
SI.eraseFromParent();
1391}

1393/// Build a GEP out of a base pointer and indices.
1394///
1395/// This will return the BasePtr if that is valid, or build a new GEP
1396/// instruction using the IRBuilder if GEP-ing is needed.
1397static Value *buildGEP(IRBuilderTy &IRB, Value *BasePtr,
                     SmallVectorImpl<Value *> &Indices, Twine NamePrefix) {
if (Indices.empty())
  return BasePtr;

// A single zero index is a no-op, so check for this and avoid building a GEP
// in that case.
if (Indices.size() == 1 && cast<ConstantInt>(Indices.back())->isZero())
  return BasePtr;

return IRB.CreateInBoundsGEP(BasePtr->getType()->getPointerElementType(),
                             BasePtr, Indices, NamePrefix + "sroa_idx");
1409}

1411/// Get a natural GEP off of the BasePtr walking through Ty toward
1412/// TargetTy without changing the offset of the pointer.
1413///
1414/// This routine assumes we've already established a properly offset GEP with
1415/// Indices, and arrived at the Ty type. The goal is to continue to GEP with
1416/// zero-indices down through type layers until we find one the same as
1417/// TargetTy. If we can't find one with the same type, we at least try to use
1418/// one with the same size. If none of that works, we just produce the GEP as
1419/// indicated by Indices to have the correct offset.
1420static Value *getNaturalGEPWithType(IRBuilderTy &IRB, const DataLayout &DL,
                                  Value *BasePtr, Type *Ty, Type *TargetTy,
                                  SmallVectorImpl<Value *> &Indices,
                                  Twine NamePrefix) {
if (Ty == TargetTy)
  return buildGEP(IRB, BasePtr, Indices, NamePrefix);

// Offset size to use for the indices.
unsigned OffsetSize = DL.getIndexTypeSizeInBits(BasePtr->getType());

// See if we can descend into a struct and locate a field with the correct
// type.
unsigned NumLayers = 0;
Type *ElementTy = Ty;
do {
  if (ElementTy->isPointerTy())
    break;

  if (ArrayType *ArrayTy = dyn_cast<ArrayType>(ElementTy)) {
    ElementTy = ArrayTy->getElementType();
    Indices.push_back(IRB.getIntN(OffsetSize, 0));
  } else if (VectorType *VectorTy = dyn_cast<VectorType>(ElementTy)) {
    ElementTy = VectorTy->getElementType();
    Indices.push_back(IRB.getInt32(0));
  } else if (StructType *STy = dyn_cast<StructType>(ElementTy)) {
    if (STy->element_begin() == STy->element_end())
      break; // Nothing left to descend into.
    ElementTy = *STy->element_begin();
    Indices.push_back(IRB.getInt32(0));
  } else {
    break;
  }
  ++NumLayers;
} while (ElementTy != TargetTy);
if (ElementTy != TargetTy)
  Indices.erase(Indices.end() - NumLayers, Indices.end());

return buildGEP(IRB, BasePtr, Indices, NamePrefix);
1458}

1460/// Recursively compute indices for a natural GEP.
1461///
1462/// This is the recursive step for getNaturalGEPWithOffset that walks down the
1463/// element types adding appropriate indices for the GEP.
1464static Value *getNaturalGEPRecursively(IRBuilderTy &IRB, const DataLayout &DL,
                                     Value *Ptr, Type *Ty, APInt &Offset,
                                     Type *TargetTy,
                                     SmallVectorImpl<Value *> &Indices,
                                     Twine NamePrefix) {
if (Offset == 0)
  return getNaturalGEPWithType(IRB, DL, Ptr, Ty, TargetTy, Indices,
                               NamePrefix);

// We can't recurse through pointer types.
if (Ty->isPointerTy())
  return nullptr;

// We try to analyze GEPs over vectors here, but note that these GEPs are
// extremely poorly defined currently. The long-term goal is to remove GEPing
// over a vector from the IR completely.
if (VectorType *VecTy = dyn_cast<VectorType>(Ty)) {
  unsigned ElementSizeInBits = DL.getTypeSizeInBits(VecTy->getScalarType());
  if (ElementSizeInBits % 8 != 0) {
    // GEPs over non-multiple of 8 size vector elements are invalid.
    return nullptr;
  }
  APInt ElementSize(Offset.getBitWidth(), ElementSizeInBits / 8);
  APInt NumSkippedElements = Offset.sdiv(ElementSize);
  if (NumSkippedElements.ugt(VecTy->getNumElements()))
    return nullptr;
  Offset -= NumSkippedElements * ElementSize;
  Indices.push_back(IRB.getInt(NumSkippedElements));
  return getNaturalGEPRecursively(IRB, DL, Ptr, VecTy->getElementType(),
                                  Offset, TargetTy, Indices, NamePrefix);
}

if (ArrayType *ArrTy = dyn_cast<ArrayType>(Ty)) {
  Type *ElementTy = ArrTy->getElementType();
  APInt ElementSize(Offset.getBitWidth(), DL.getTypeAllocSize(ElementTy));
  APInt NumSkippedElements = Offset.sdiv(ElementSize);
  if (NumSkippedElements.ugt(ArrTy->getNumElements()))
    return nullptr;

  Offset -= NumSkippedElements * ElementSize;
  Indices.push_back(IRB.getInt(NumSkippedElements));
  return getNaturalGEPRecursively(IRB, DL, Ptr, ElementTy, Offset, TargetTy,
                                  Indices, NamePrefix);
}

StructType *STy = dyn_cast<StructType>(Ty);
if (!STy)
  return nullptr;

const StructLayout *SL = DL.getStructLayout(STy);
uint64_t StructOffset = Offset.getZExtValue();
if (StructOffset >= SL->getSizeInBytes())
  return nullptr;
unsigned Index = SL->getElementContainingOffset(StructOffset);
Offset -= APInt(Offset.getBitWidth(), SL->getElementOffset(Index));
Type *ElementTy = STy->getElementType(Index);
if (Offset.uge(DL.getTypeAllocSize(ElementTy)))
  return nullptr; // The offset points into alignment padding.

Indices.push_back(IRB.getInt32(Index));
return getNaturalGEPRecursively(IRB, DL, Ptr, ElementTy, Offset, TargetTy,
                                Indices, NamePrefix);
1526}

1528/// Get a natural GEP from a base pointer to a particular offset and
1529/// resulting in a particular type.
1530///
1531/// The goal is to produce a "natural" looking GEP that works with the existing
1532/// composite types to arrive at the appropriate offset and element type for
1533/// a pointer. TargetTy is the element type the returned GEP should point-to if
1534/// possible. We recurse by decreasing Offset, adding the appropriate index to
1535/// Indices, and setting Ty to the result subtype.
1536///
1537/// If no natural GEP can be constructed, this function returns null.
1538static Value *getNaturalGEPWithOffset(IRBuilderTy &IRB, const DataLayout &DL,
                                    Value *Ptr, APInt Offset, Type *TargetTy,
                                    SmallVectorImpl<Value *> &Indices,
                                    Twine NamePrefix) {
PointerType *Ty = cast<PointerType>(Ptr->getType());

// Don't consider any GEPs through an i8* as natural unless the TargetTy is
// an i8.
if (Ty == IRB.getInt8PtrTy(Ty->getAddressSpace()) && TargetTy->isIntegerTy(8))
  return nullptr;

Type *ElementTy = Ty->getElementType();
if (!ElementTy->isSized())
  return nullptr; // We can't GEP through an unsized element.
APInt ElementSize(Offset.getBitWidth(), DL.getTypeAllocSize(ElementTy));
if (ElementSize == 0)
  return nullptr; // Zero-length arrays can't help us build a natural GEP.
APInt NumSkippedElements = Offset.sdiv(ElementSize);

Offset -= NumSkippedElements * ElementSize;
Indices.push_back(IRB.getInt(NumSkippedElements));
return getNaturalGEPRecursively(IRB, DL, Ptr, ElementTy, Offset, TargetTy,
                                Indices, NamePrefix);
1561}

1563/// Compute an adjusted pointer from Ptr by Offset bytes where the
1564/// resulting pointer has PointerTy.
1565///
1566/// This tries very hard to compute a "natural" GEP which arrives at the offset
1567/// and produces the pointer type desired. Where it cannot, it will try to use
1568/// the natural GEP to arrive at the offset and bitcast to the type. Where that
1569/// fails, it will try to use an existing i8* and GEP to the byte offset and
1570/// bitcast to the type.
1571///
1572/// The strategy for finding the more natural GEPs is to peel off layers of the
1573/// pointer, walking back through bit casts and GEPs, searching for a base
1574/// pointer from which we can compute a natural GEP with the desired
1575/// properties. The algorithm tries to fold as many constant indices into
1576/// a single GEP as possible, thus making each GEP more independent of the
1577/// surrounding code.
1578static Value *getAdjustedPtr(IRBuilderTy &IRB, const DataLayout &DL, Value *Ptr,
                           APInt Offset, Type *PointerTy, Twine NamePrefix) {
// Even though we don't look through PHI nodes, we could be called on an
// instruction in an unreachable block, which may be on a cycle.
SmallPtrSet<Value *, 4> Visited;
Visited.insert(Ptr);
SmallVector<Value *, 4> Indices;

// We may end up computing an offset pointer that has the wrong type. If we
// never are able to compute one directly that has the correct type, we'll
// fall back to it, so keep it and the base it was computed from around here.
Value *OffsetPtr = nullptr;
Value *OffsetBasePtr;

// Remember any i8 pointer we come across to re-use if we need to do a raw
// byte offset.
Value *Int8Ptr = nullptr;
APInt Int8PtrOffset(Offset.getBitWidth(), 0);

PointerType *TargetPtrTy = cast<PointerType>(PointerTy);
25
←
'PointerTy' is a 'PointerType'→
Type *TargetTy = TargetPtrTy->getElementType();

// As `addrspacecast` is , `Ptr` (the storage pointer) may have different
// address space from the expected `PointerTy` (the pointer to be used).
// Adjust the pointer type based the original storage pointer.
auto AS = cast<PointerType>(Ptr->getType())->getAddressSpace();
26
←
The object is a 'PointerType'→
PointerTy = TargetTy->getPointerTo(AS);

do {
  // First fold any existing GEPs into the offset.
  while (GEPOperator *GEP = dyn_cast<GEPOperator>(Ptr)) {
27
←
Assuming 'Ptr' is not a 'GEPOperator'→
28
←
Loop condition is false. Execution continues on line 1619→
    APInt GEPOffset(Offset.getBitWidth(), 0);
    if (!GEP->accumulateConstantOffset(DL, GEPOffset))
      break;
    Offset += GEPOffset;
    Ptr = GEP->getPointerOperand();
    if (!Visited.insert(Ptr).second)
      break;
  }

  // See if we can perform a natural GEP here.
  Indices.clear();
  if (Value *P28.1
'P' is null
1
'P' is null
1
'P' is null
 = getNaturalGEPWithOffset(IRB, DL, Ptr, Offset, TargetTy,
29
←
Taking false branch→
                                         Indices, NamePrefix)) {
    // If we have a new natural pointer at the offset, clear out any old
    // offset pointer we computed. Unless it is the base pointer or
    // a non-instruction, we built a GEP we don't need. Zap it.
    if (OffsetPtr && OffsetPtr != OffsetBasePtr)
      if (Instruction *I = dyn_cast<Instruction>(OffsetPtr)) {
        assert(I->use_empty() && "Built a GEP with uses some how!")((I->use_empty() && "Built a GEP with uses some how!"
) ? static_cast<void> (0) : __assert_fail ("I->use_empty() && \"Built a GEP with uses some how!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1627, __PRETTY_FUNCTION__));
        I->eraseFromParent();
      }
    OffsetPtr = P;
    OffsetBasePtr = Ptr;
    // If we also found a pointer of the right type, we're done.
    if (P->getType() == PointerTy)
      break;
  }

  // Stash this pointer if we've found an i8*.
  if (Ptr->getType()->isIntegerTy(8)) {
30
←
Assuming the condition is false→
31
←
Taking false branch→
    Int8Ptr = Ptr;
    Int8PtrOffset = Offset;
  }

  // Peel off a layer of the pointer and update the offset appropriately.
  if (Operator::getOpcode(Ptr) == Instruction::BitCast) {
32
←
Taking false branch→
    Ptr = cast<Operator>(Ptr)->getOperand(0);
  } else if (GlobalAlias *GA33.1
'GA' is null
1
'GA' is null
1
'GA' is null
 = dyn_cast<GlobalAlias>(Ptr)) {
33
←
Assuming 'Ptr' is not a 'GlobalAlias'→
34
←
Taking false branch→
    if (GA->isInterposable())
      break;
    Ptr = GA->getAliasee();
  } else {
    break;
35
←
 Execution continues on line 1656→
  }
  assert(Ptr->getType()->isPointerTy() && "Unexpected operand type!")((Ptr->getType()->isPointerTy() && "Unexpected operand type!"
) ? static_cast<void> (0) : __assert_fail ("Ptr->getType()->isPointerTy() && \"Unexpected operand type!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1653, __PRETTY_FUNCTION__));
} while (Visited.insert(Ptr).second);

if (!OffsetPtr35.1
'OffsetPtr' is null
1
'OffsetPtr' is null
1
'OffsetPtr' is null
) {
36
←
Taking true branch→
  if (!Int8Ptr36.1
'Int8Ptr' is null
1
'Int8Ptr' is null
1
'Int8Ptr' is null
) {
37
←
Taking true branch→
    Int8Ptr = IRB.CreateBitCast(
        Ptr, IRB.getInt8PtrTy(PointerTy->getPointerAddressSpace()),
        NamePrefix + "sroa_raw_cast");
    Int8PtrOffset = Offset;
  }

  OffsetPtr = Int8PtrOffset == 0
38
←
'?' condition is false→
                  ? Int8Ptr
                  : IRB.CreateInBoundsGEP(IRB.getInt8Ty(), Int8Ptr,
39
←
Calling 'IRBuilder::CreateInBoundsGEP'→
53
←
Returning from 'IRBuilder::CreateInBoundsGEP'→
                                          IRB.getInt(Int8PtrOffset),
                                          NamePrefix + "sroa_raw_idx");
}
Ptr = OffsetPtr;

// On the off chance we were targeting i8*, guard the bitcast here.
if (cast<PointerType>(Ptr->getType()) != TargetPtrTy) {
54
←
The object is a 'PointerType'→
55
←
Assuming the condition is false→
56
←
Taking false branch→
  Ptr = IRB.CreatePointerBitCastOrAddrSpaceCast(Ptr,
                                                TargetPtrTy,
                                                NamePrefix + "sroa_cast");
}

return Ptr;
1680}

1682/// Compute the adjusted alignment for a load or store from an offset.
1683static unsigned getAdjustedAlignment(Instruction *I, uint64_t Offset,
                                   const DataLayout &DL) {
unsigned Alignment;
Type *Ty;
if (auto *LI = dyn_cast<LoadInst>(I)) {
  Alignment = LI->getAlignment();
  Ty = LI->getType();
} else if (auto *SI = dyn_cast<StoreInst>(I)) {
  Alignment = SI->getAlignment();
  Ty = SI->getValueOperand()->getType();
} else {
  llvm_unreachable("Only loads and stores are allowed!")::llvm::llvm_unreachable_internal("Only loads and stores are allowed!"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1694);
}

if (!Alignment)
  Alignment = DL.getABITypeAlignment(Ty);

return MinAlign(Alignment, Offset);
1701}

1703/// Test whether we can convert a value from the old to the new type.
1704///
1705/// This predicate should be used to guard calls to convertValue in order to
1706/// ensure that we only try to convert viable values. The strategy is that we
1707/// will peel off single element struct and array wrappings to get to an
1708/// underlying value, and convert that value.
1709static bool canConvertValue(const DataLayout &DL, Type *OldTy, Type *NewTy) {
if (OldTy == NewTy)
  return true;

// For integer types, we can't handle any bit-width differences. This would
// break both vector conversions with extension and introduce endianness
// issues when in conjunction with loads and stores.
if (isa<IntegerType>(OldTy) && isa<IntegerType>(NewTy)) {
  assert(cast<IntegerType>(OldTy)->getBitWidth() !=((cast<IntegerType>(OldTy)->getBitWidth() != cast<
IntegerType>(NewTy)->getBitWidth() && "We can't have the same bitwidth for different int types"
) ? static_cast<void> (0) : __assert_fail ("cast<IntegerType>(OldTy)->getBitWidth() != cast<IntegerType>(NewTy)->getBitWidth() && \"We can't have the same bitwidth for different int types\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1719, __PRETTY_FUNCTION__))
             cast<IntegerType>(NewTy)->getBitWidth() &&((cast<IntegerType>(OldTy)->getBitWidth() != cast<
IntegerType>(NewTy)->getBitWidth() && "We can't have the same bitwidth for different int types"
) ? static_cast<void> (0) : __assert_fail ("cast<IntegerType>(OldTy)->getBitWidth() != cast<IntegerType>(NewTy)->getBitWidth() && \"We can't have the same bitwidth for different int types\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1719, __PRETTY_FUNCTION__))
         "We can't have the same bitwidth for different int types")((cast<IntegerType>(OldTy)->getBitWidth() != cast<
IntegerType>(NewTy)->getBitWidth() && "We can't have the same bitwidth for different int types"
) ? static_cast<void> (0) : __assert_fail ("cast<IntegerType>(OldTy)->getBitWidth() != cast<IntegerType>(NewTy)->getBitWidth() && \"We can't have the same bitwidth for different int types\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1719, __PRETTY_FUNCTION__));
  return false;
}

if (DL.getTypeSizeInBits(NewTy) != DL.getTypeSizeInBits(OldTy))
  return false;
if (!NewTy->isSingleValueType() || !OldTy->isSingleValueType())
  return false;

// We can convert pointers to integers and vice-versa. Same for vectors
// of pointers and integers.
OldTy = OldTy->getScalarType();
NewTy = NewTy->getScalarType();
if (NewTy->isPointerTy() || OldTy->isPointerTy()) {
  if (NewTy->isPointerTy() && OldTy->isPointerTy()) {
    return cast<PointerType>(NewTy)->getPointerAddressSpace() ==
      cast<PointerType>(OldTy)->getPointerAddressSpace();
  }

  // We can convert integers to integral pointers, but not to non-integral
  // pointers.
  if (OldTy->isIntegerTy())
    return !DL.isNonIntegralPointerType(NewTy);

  // We can convert integral pointers to integers, but non-integral pointers
  // need to remain pointers.
  if (!DL.isNonIntegralPointerType(OldTy))
    return NewTy->isIntegerTy();

  return false;
}

return true;
1752}

1754/// Generic routine to convert an SSA value to a value of a different
1755/// type.
1756///
1757/// This will try various different casting techniques, such as bitcasts,
1758/// inttoptr, and ptrtoint casts. Use the \c canConvertValue predicate to test
1759/// two types for viability with this routine.
1760static Value *convertValue(const DataLayout &DL, IRBuilderTy &IRB, Value *V,
                         Type *NewTy) {
Type *OldTy = V->getType();
assert(canConvertValue(DL, OldTy, NewTy) && "Value not convertable to type")((canConvertValue(DL, OldTy, NewTy) && "Value not convertable to type"
) ? static_cast<void> (0) : __assert_fail ("canConvertValue(DL, OldTy, NewTy) && \"Value not convertable to type\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1763, __PRETTY_FUNCTION__));

if (OldTy == NewTy)
  return V;

assert(!(isa<IntegerType>(OldTy) && isa<IntegerType>(NewTy)) &&((!(isa<IntegerType>(OldTy) && isa<IntegerType
>(NewTy)) && "Integer types must be the exact same to convert."
) ? static_cast<void> (0) : __assert_fail ("!(isa<IntegerType>(OldTy) && isa<IntegerType>(NewTy)) && \"Integer types must be the exact same to convert.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1769, __PRETTY_FUNCTION__))
       "Integer types must be the exact same to convert.")((!(isa<IntegerType>(OldTy) && isa<IntegerType
>(NewTy)) && "Integer types must be the exact same to convert."
) ? static_cast<void> (0) : __assert_fail ("!(isa<IntegerType>(OldTy) && isa<IntegerType>(NewTy)) && \"Integer types must be the exact same to convert.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1769, __PRETTY_FUNCTION__));

// See if we need inttoptr for this type pair. A cast involving both scalars
// and vectors requires and additional bitcast.
if (OldTy->isIntOrIntVectorTy() && NewTy->isPtrOrPtrVectorTy()) {
  // Expand <2 x i32> to i8* --> <2 x i32> to i64 to i8*
  if (OldTy->isVectorTy() && !NewTy->isVectorTy())
    return IRB.CreateIntToPtr(IRB.CreateBitCast(V, DL.getIntPtrType(NewTy)),
                              NewTy);

  // Expand i128 to <2 x i8*> --> i128 to <2 x i64> to <2 x i8*>
  if (!OldTy->isVectorTy() && NewTy->isVectorTy())
    return IRB.CreateIntToPtr(IRB.CreateBitCast(V, DL.getIntPtrType(NewTy)),
                              NewTy);

  return IRB.CreateIntToPtr(V, NewTy);
}

// See if we need ptrtoint for this type pair. A cast involving both scalars
// and vectors requires and additional bitcast.
if (OldTy->isPtrOrPtrVectorTy() && NewTy->isIntOrIntVectorTy()) {
  // Expand <2 x i8*> to i128 --> <2 x i8*> to <2 x i64> to i128
  if (OldTy->isVectorTy() && !NewTy->isVectorTy())
    return IRB.CreateBitCast(IRB.CreatePtrToInt(V, DL.getIntPtrType(OldTy)),
                             NewTy);

  // Expand i8* to <2 x i32> --> i8* to i64 to <2 x i32>
  if (!OldTy->isVectorTy() && NewTy->isVectorTy())
    return IRB.CreateBitCast(IRB.CreatePtrToInt(V, DL.getIntPtrType(OldTy)),
                             NewTy);

  return IRB.CreatePtrToInt(V, NewTy);
}

return IRB.CreateBitCast(V, NewTy);
1804}

1806/// Test whether the given slice use can be promoted to a vector.
1807///
1808/// This function is called to test each entry in a partition which is slated
1809/// for a single slice.
1810static bool isVectorPromotionViableForSlice(Partition &P, const Slice &S,
                                          VectorType *Ty,
                                          uint64_t ElementSize,
                                          const DataLayout &DL) {
// First validate the slice offsets.
uint64_t BeginOffset =
    std::max(S.beginOffset(), P.beginOffset()) - P.beginOffset();
uint64_t BeginIndex = BeginOffset / ElementSize;
if (BeginIndex * ElementSize != BeginOffset ||
    BeginIndex >= Ty->getNumElements())
  return false;
uint64_t EndOffset =
    std::min(S.endOffset(), P.endOffset()) - P.beginOffset();
uint64_t EndIndex = EndOffset / ElementSize;
if (EndIndex * ElementSize != EndOffset || EndIndex > Ty->getNumElements())
  return false;

assert(EndIndex > BeginIndex && "Empty vector!")((EndIndex > BeginIndex && "Empty vector!") ? static_cast
<void> (0) : __assert_fail ("EndIndex > BeginIndex && \"Empty vector!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1827, __PRETTY_FUNCTION__));
uint64_t NumElements = EndIndex - BeginIndex;
Type *SliceTy = (NumElements == 1)
                    ? Ty->getElementType()
                    : VectorType::get(Ty->getElementType(), NumElements);

Type *SplitIntTy =
    Type::getIntNTy(Ty->getContext(), NumElements * ElementSize * 8);

Use *U = S.getUse();

if (MemIntrinsic *MI = dyn_cast<MemIntrinsic>(U->getUser())) {
  if (MI->isVolatile())
    return false;
  if (!S.isSplittable())
    return false; // Skip any unsplittable intrinsics.
} else if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(U->getUser())) {
  if (!II->isLifetimeStartOrEnd())
    return false;
} else if (U->get()->getType()->getPointerElementType()->isStructTy()) {
  // Disable vector promotion when there are loads or stores of an FCA.
  return false;
} else if (LoadInst *LI = dyn_cast<LoadInst>(U->getUser())) {
  if (LI->isVolatile())
    return false;
  Type *LTy = LI->getType();
  if (P.beginOffset() > S.beginOffset() || P.endOffset() < S.endOffset()) {
    assert(LTy->isIntegerTy())((LTy->isIntegerTy()) ? static_cast<void> (0) : __assert_fail
 ("LTy->isIntegerTy()", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1854, __PRETTY_FUNCTION__));
    LTy = SplitIntTy;
  }
  if (!canConvertValue(DL, SliceTy, LTy))
    return false;
} else if (StoreInst *SI = dyn_cast<StoreInst>(U->getUser())) {
  if (SI->isVolatile())
    return false;
  Type *STy = SI->getValueOperand()->getType();
  if (P.beginOffset() > S.beginOffset() || P.endOffset() < S.endOffset()) {
    assert(STy->isIntegerTy())((STy->isIntegerTy()) ? static_cast<void> (0) : __assert_fail
 ("STy->isIntegerTy()", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1864, __PRETTY_FUNCTION__));
    STy = SplitIntTy;
  }
  if (!canConvertValue(DL, STy, SliceTy))
    return false;
} else {
  return false;
}

return true;
1874}

1876/// Test whether the given alloca partitioning and range of slices can be
1877/// promoted to a vector.
1878///
1879/// This is a quick test to check whether we can rewrite a particular alloca
1880/// partition (and its newly formed alloca) into a vector alloca with only
1881/// whole-vector loads and stores such that it could be promoted to a vector
1882/// SSA value. We only can ensure this for a limited set of operations, and we
1883/// don't want to do the rewrites unless we are confident that the result will
1884/// be promotable, so we have an early test here.
1885static VectorType *isVectorPromotionViable(Partition &P, const DataLayout &DL) {
// Collect the candidate types for vector-based promotion. Also track whether
// we have different element types.
SmallVector<VectorType *, 4> CandidateTys;
Type *CommonEltTy = nullptr;
bool HaveCommonEltTy = true;
auto CheckCandidateType = [&](Type *Ty) {
  if (auto *VTy = dyn_cast<VectorType>(Ty)) {
    // Return if bitcast to vectors is different for total size in bits.
    if (!CandidateTys.empty()) {
      VectorType *V = CandidateTys[0];
      if (DL.getTypeSizeInBits(VTy) != DL.getTypeSizeInBits(V)) {
        CandidateTys.clear();
        return;
      }
    }
    CandidateTys.push_back(VTy);
    if (!CommonEltTy)
      CommonEltTy = VTy->getElementType();
    else if (CommonEltTy != VTy->getElementType())
      HaveCommonEltTy = false;
  }
};
// Consider any loads or stores that are the exact size of the slice.
for (const Slice &S : P)
  if (S.beginOffset() == P.beginOffset() &&
      S.endOffset() == P.endOffset()) {
    if (auto *LI = dyn_cast<LoadInst>(S.getUse()->getUser()))
      CheckCandidateType(LI->getType());
    else if (auto *SI = dyn_cast<StoreInst>(S.getUse()->getUser()))
      CheckCandidateType(SI->getValueOperand()->getType());
  }

// If we didn't find a vector type, nothing to do here.
if (CandidateTys.empty())
  return nullptr;

// Remove non-integer vector types if we had multiple common element types.
// FIXME: It'd be nice to replace them with integer vector types, but we can't
// do that until all the backends are known to produce good code for all
// integer vector types.
if (!HaveCommonEltTy) {
  CandidateTys.erase(
      llvm::remove_if(CandidateTys,
                      [](VectorType *VTy) {
                        return !VTy->getElementType()->isIntegerTy();
                      }),
      CandidateTys.end());

  // If there were no integer vector types, give up.
  if (CandidateTys.empty())
    return nullptr;

  // Rank the remaining candidate vector types. This is easy because we know
  // they're all integer vectors. We sort by ascending number of elements.
  auto RankVectorTypes = [&DL](VectorType *RHSTy, VectorType *LHSTy) {
    (void)DL;
    assert(DL.getTypeSizeInBits(RHSTy) == DL.getTypeSizeInBits(LHSTy) &&((DL.getTypeSizeInBits(RHSTy) == DL.getTypeSizeInBits(LHSTy) &&
 "Cannot have vector types of different sizes!") ? static_cast
<void> (0) : __assert_fail ("DL.getTypeSizeInBits(RHSTy) == DL.getTypeSizeInBits(LHSTy) && \"Cannot have vector types of different sizes!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1943, __PRETTY_FUNCTION__))
           "Cannot have vector types of different sizes!")((DL.getTypeSizeInBits(RHSTy) == DL.getTypeSizeInBits(LHSTy) &&
 "Cannot have vector types of different sizes!") ? static_cast
<void> (0) : __assert_fail ("DL.getTypeSizeInBits(RHSTy) == DL.getTypeSizeInBits(LHSTy) && \"Cannot have vector types of different sizes!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1943, __PRETTY_FUNCTION__));
    assert(RHSTy->getElementType()->isIntegerTy() &&((RHSTy->getElementType()->isIntegerTy() && "All non-integer types eliminated!"
) ? static_cast<void> (0) : __assert_fail ("RHSTy->getElementType()->isIntegerTy() && \"All non-integer types eliminated!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1945, __PRETTY_FUNCTION__))
           "All non-integer types eliminated!")((RHSTy->getElementType()->isIntegerTy() && "All non-integer types eliminated!"
) ? static_cast<void> (0) : __assert_fail ("RHSTy->getElementType()->isIntegerTy() && \"All non-integer types eliminated!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1945, __PRETTY_FUNCTION__));
    assert(LHSTy->getElementType()->isIntegerTy() &&((LHSTy->getElementType()->isIntegerTy() && "All non-integer types eliminated!"
) ? static_cast<void> (0) : __assert_fail ("LHSTy->getElementType()->isIntegerTy() && \"All non-integer types eliminated!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1947, __PRETTY_FUNCTION__))
           "All non-integer types eliminated!")((LHSTy->getElementType()->isIntegerTy() && "All non-integer types eliminated!"
) ? static_cast<void> (0) : __assert_fail ("LHSTy->getElementType()->isIntegerTy() && \"All non-integer types eliminated!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1947, __PRETTY_FUNCTION__));
    return RHSTy->getNumElements() < LHSTy->getNumElements();
  };
  llvm::sort(CandidateTys, RankVectorTypes);
  CandidateTys.erase(
      std::unique(CandidateTys.begin(), CandidateTys.end(), RankVectorTypes),
      CandidateTys.end());
} else {
1955// The only way to have the same element type in every vector type is to
1956// have the same vector type. Check that and remove all but one.
1957#ifndef NDEBUG
  for (VectorType *VTy : CandidateTys) {
    assert(VTy->getElementType() == CommonEltTy &&((VTy->getElementType() == CommonEltTy && "Unaccounted for element type!"
) ? static_cast<void> (0) : __assert_fail ("VTy->getElementType() == CommonEltTy && \"Unaccounted for element type!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1960, __PRETTY_FUNCTION__))
           "Unaccounted for element type!")((VTy->getElementType() == CommonEltTy && "Unaccounted for element type!"
) ? static_cast<void> (0) : __assert_fail ("VTy->getElementType() == CommonEltTy && \"Unaccounted for element type!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1960, __PRETTY_FUNCTION__));
    assert(VTy == CandidateTys[0] &&((VTy == CandidateTys[0] && "Different vector types with the same element type!"
) ? static_cast<void> (0) : __assert_fail ("VTy == CandidateTys[0] && \"Different vector types with the same element type!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1962, __PRETTY_FUNCTION__))
           "Different vector types with the same element type!")((VTy == CandidateTys[0] && "Different vector types with the same element type!"
) ? static_cast<void> (0) : __assert_fail ("VTy == CandidateTys[0] && \"Different vector types with the same element type!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1962, __PRETTY_FUNCTION__));
  }
1964#endif
  CandidateTys.resize(1);
}

// Try each vector type, and return the one which works.
auto CheckVectorTypeForPromotion = [&](VectorType *VTy) {
  uint64_t ElementSize = DL.getTypeSizeInBits(VTy->getElementType());

  // While the definition of LLVM vectors is bitpacked, we don't support sizes
  // that aren't byte sized.
  if (ElementSize % 8)
    return false;
  assert((DL.getTypeSizeInBits(VTy) % 8) == 0 &&(((DL.getTypeSizeInBits(VTy) % 8) == 0 && "vector size not a multiple of element size?"
) ? static_cast<void> (0) : __assert_fail ("(DL.getTypeSizeInBits(VTy) % 8) == 0 && \"vector size not a multiple of element size?\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1977, __PRETTY_FUNCTION__))
         "vector size not a multiple of element size?")(((DL.getTypeSizeInBits(VTy) % 8) == 0 && "vector size not a multiple of element size?"
) ? static_cast<void> (0) : __assert_fail ("(DL.getTypeSizeInBits(VTy) % 8) == 0 && \"vector size not a multiple of element size?\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 1977, __PRETTY_FUNCTION__));
  ElementSize /= 8;

  for (const Slice &S : P)
    if (!isVectorPromotionViableForSlice(P, S, VTy, ElementSize, DL))
      return false;

  for (const Slice *S : P.splitSliceTails())
    if (!isVectorPromotionViableForSlice(P, *S, VTy, ElementSize, DL))
      return false;

  return true;
};
for (VectorType *VTy : CandidateTys)
  if (CheckVectorTypeForPromotion(VTy))
    return VTy;

return nullptr;
1995}

1997/// Test whether a slice of an alloca is valid for integer widening.
1998///
1999/// This implements the necessary checking for the \c isIntegerWideningViable
2000/// test below on a single slice of the alloca.
2001static bool isIntegerWideningViableForSlice(const Slice &S,
                                          uint64_t AllocBeginOffset,
                                          Type *AllocaTy,
                                          const DataLayout &DL,
                                          bool &WholeAllocaOp) {
uint64_t Size = DL.getTypeStoreSize(AllocaTy);

uint64_t RelBegin = S.beginOffset() - AllocBeginOffset;
uint64_t RelEnd = S.endOffset() - AllocBeginOffset;

// We can't reasonably handle cases where the load or store extends past
// the end of the alloca's type and into its padding.
if (RelEnd > Size)
  return false;

Use *U = S.getUse();

if (LoadInst *LI = dyn_cast<LoadInst>(U->getUser())) {
  if (LI->isVolatile())
    return false;
  // We can't handle loads that extend past the allocated memory.
  if (DL.getTypeStoreSize(LI->getType()) > Size)
    return false;
  // So far, AllocaSliceRewriter does not support widening split slice tails
  // in rewriteIntegerLoad.
  if (S.beginOffset() < AllocBeginOffset)
    return false;
  // Note that we don't count vector loads or stores as whole-alloca
  // operations which enable integer widening because we would prefer to use
  // vector widening instead.
  if (!isa<VectorType>(LI->getType()) && RelBegin == 0 && RelEnd == Size)
    WholeAllocaOp = true;
  if (IntegerType *ITy = dyn_cast<IntegerType>(LI->getType())) {
    if (ITy->getBitWidth() < DL.getTypeStoreSizeInBits(ITy))
      return false;
  } else if (RelBegin != 0 || RelEnd != Size ||
             !canConvertValue(DL, AllocaTy, LI->getType())) {
    // Non-integer loads need to be convertible from the alloca type so that
    // they are promotable.
    return false;
  }
} else if (StoreInst *SI = dyn_cast<StoreInst>(U->getUser())) {
  Type *ValueTy = SI->getValueOperand()->getType();
  if (SI->isVolatile())
    return false;
  // We can't handle stores that extend past the allocated memory.
  if (DL.getTypeStoreSize(ValueTy) > Size)
    return false;
  // So far, AllocaSliceRewriter does not support widening split slice tails
  // in rewriteIntegerStore.
  if (S.beginOffset() < AllocBeginOffset)
    return false;
  // Note that we don't count vector loads or stores as whole-alloca
  // operations which enable integer widening because we would prefer to use
  // vector widening instead.
  if (!isa<VectorType>(ValueTy) && RelBegin == 0 && RelEnd == Size)
    WholeAllocaOp = true;
  if (IntegerType *ITy = dyn_cast<IntegerType>(ValueTy)) {
    if (ITy->getBitWidth() < DL.getTypeStoreSizeInBits(ITy))
      return false;
  } else if (RelBegin != 0 || RelEnd != Size ||
             !canConvertValue(DL, ValueTy, AllocaTy)) {
    // Non-integer stores need to be convertible to the alloca type so that
    // they are promotable.
    return false;
  }
} else if (MemIntrinsic *MI = dyn_cast<MemIntrinsic>(U->getUser())) {
  if (MI->isVolatile() || !isa<Constant>(MI->getLength()))
    return false;
  if (!S.isSplittable())
    return false; // Skip any unsplittable intrinsics.
} else if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(U->getUser())) {
  if (!II->isLifetimeStartOrEnd())
    return false;
} else {
  return false;
}

return true;
2080}

2082/// Test whether the given alloca partition's integer operations can be
2083/// widened to promotable ones.
2084///
2085/// This is a quick test to check whether we can rewrite the integer loads and
2086/// stores to a particular alloca into wider loads and stores and be able to
2087/// promote the resulting alloca.
2088static bool isIntegerWideningViable(Partition &P, Type *AllocaTy,
                                  const DataLayout &DL) {
uint64_t SizeInBits = DL.getTypeSizeInBits(AllocaTy);
// Don't create integer types larger than the maximum bitwidth.
if (SizeInBits > IntegerType::MAX_INT_BITS)
  return false;

// Don't try to handle allocas with bit-padding.
if (SizeInBits != DL.getTypeStoreSizeInBits(AllocaTy))
  return false;

// We need to ensure that an integer type with the appropriate bitwidth can
// be converted to the alloca type, whatever that is. We don't want to force
// the alloca itself to have an integer type if there is a more suitable one.
Type *IntTy = Type::getIntNTy(AllocaTy->getContext(), SizeInBits);
if (!canConvertValue(DL, AllocaTy, IntTy) ||
    !canConvertValue(DL, IntTy, AllocaTy))
  return false;

// While examining uses, we ensure that the alloca has a covering load or
// store. We don't want to widen the integer operations only to fail to
// promote due to some other unsplittable entry (which we may make splittable
// later). However, if there are only splittable uses, go ahead and assume
// that we cover the alloca.
// FIXME: We shouldn't consider split slices that happen to start in the
// partition here...
bool WholeAllocaOp =
    P.begin() != P.end() ? false : DL.isLegalInteger(SizeInBits);

for (const Slice &S : P)
  if (!isIntegerWideningViableForSlice(S, P.beginOffset(), AllocaTy, DL,
                                       WholeAllocaOp))
    return false;

for (const Slice *S : P.splitSliceTails())
  if (!isIntegerWideningViableForSlice(*S, P.beginOffset(), AllocaTy, DL,
                                       WholeAllocaOp))
    return false;

return WholeAllocaOp;
2128}

2130static Value *extractInteger(const DataLayout &DL, IRBuilderTy &IRB, Value *V,
                           IntegerType *Ty, uint64_t Offset,
                           const Twine &Name) {
LLVM_DEBUG(dbgs() << "       start: " << *V << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "       start: " << *V <<
 "\n"; } } while (false);
64
←
Assuming 'DebugFlag' is false→
65
←
Loop condition is false.  Exiting loop→
IntegerType *IntTy = cast<IntegerType>(V->getType());
66
←
The object is a 'IntegerType'→
assert(DL.getTypeStoreSize(Ty) + Offset <= DL.getTypeStoreSize(IntTy) &&((DL.getTypeStoreSize(Ty) + Offset <= DL.getTypeStoreSize(
IntTy) && "Element extends past full value") ? static_cast
<void> (0) : __assert_fail ("DL.getTypeStoreSize(Ty) + Offset <= DL.getTypeStoreSize(IntTy) && \"Element extends past full value\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2136, __PRETTY_FUNCTION__))
67
←
Assuming the condition is true→
68
←
'?' condition is true→
       "Element extends past full value")((DL.getTypeStoreSize(Ty) + Offset <= DL.getTypeStoreSize(
IntTy) && "Element extends past full value") ? static_cast
<void> (0) : __assert_fail ("DL.getTypeStoreSize(Ty) + Offset <= DL.getTypeStoreSize(IntTy) && \"Element extends past full value\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2136, __PRETTY_FUNCTION__));
uint64_t ShAmt = 8 * Offset;
if (DL.isBigEndian())
69
←
Assuming the condition is false→
70
←
Taking false branch→
  ShAmt = 8 * (DL.getTypeStoreSize(IntTy) - DL.getTypeStoreSize(Ty) - Offset);
if (ShAmt) {
71
←
Assuming 'ShAmt' is 0→
72
←
Taking false branch→
  V = IRB.CreateLShr(V, ShAmt, Name + ".shift");
  LLVM_DEBUG(dbgs() << "     shifted: " << *V << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "     shifted: " << *V <<
 "\n"; } } while (false);
}
assert(Ty->getBitWidth() <= IntTy->getBitWidth() &&((Ty->getBitWidth() <= IntTy->getBitWidth() &&
 "Cannot extract to a larger integer!") ? static_cast<void
> (0) : __assert_fail ("Ty->getBitWidth() <= IntTy->getBitWidth() && \"Cannot extract to a larger integer!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2145, __PRETTY_FUNCTION__))
73
←
Called C++ object pointer is null
       "Cannot extract to a larger integer!")((Ty->getBitWidth() <= IntTy->getBitWidth() &&
 "Cannot extract to a larger integer!") ? static_cast<void
> (0) : __assert_fail ("Ty->getBitWidth() <= IntTy->getBitWidth() && \"Cannot extract to a larger integer!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2145, __PRETTY_FUNCTION__));
if (Ty != IntTy) {
  V = IRB.CreateTrunc(V, Ty, Name + ".trunc");
  LLVM_DEBUG(dbgs() << "     trunced: " << *V << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "     trunced: " << *V <<
 "\n"; } } while (false);
}
return V;
2151}

2153static Value *insertInteger(const DataLayout &DL, IRBuilderTy &IRB, Value *Old,
                          Value *V, uint64_t Offset, const Twine &Name) {
IntegerType *IntTy = cast<IntegerType>(Old->getType());
IntegerType *Ty = cast<IntegerType>(V->getType());
assert(Ty->getBitWidth() <= IntTy->getBitWidth() &&((Ty->getBitWidth() <= IntTy->getBitWidth() &&
 "Cannot insert a larger integer!") ? static_cast<void>
 (0) : __assert_fail ("Ty->getBitWidth() <= IntTy->getBitWidth() && \"Cannot insert a larger integer!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2158, __PRETTY_FUNCTION__))
       "Cannot insert a larger integer!")((Ty->getBitWidth() <= IntTy->getBitWidth() &&
 "Cannot insert a larger integer!") ? static_cast<void>
 (0) : __assert_fail ("Ty->getBitWidth() <= IntTy->getBitWidth() && \"Cannot insert a larger integer!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2158, __PRETTY_FUNCTION__));
LLVM_DEBUG(dbgs() << "       start: " << *V << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "       start: " << *V <<
 "\n"; } } while (false);
if (Ty != IntTy) {
  V = IRB.CreateZExt(V, IntTy, Name + ".ext");
  LLVM_DEBUG(dbgs() << "    extended: " << *V << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    extended: " << *V <<
 "\n"; } } while (false);
}
assert(DL.getTypeStoreSize(Ty) + Offset <= DL.getTypeStoreSize(IntTy) &&((DL.getTypeStoreSize(Ty) + Offset <= DL.getTypeStoreSize(
IntTy) && "Element store outside of alloca store") ? static_cast
<void> (0) : __assert_fail ("DL.getTypeStoreSize(Ty) + Offset <= DL.getTypeStoreSize(IntTy) && \"Element store outside of alloca store\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2165, __PRETTY_FUNCTION__))
       "Element store outside of alloca store")((DL.getTypeStoreSize(Ty) + Offset <= DL.getTypeStoreSize(
IntTy) && "Element store outside of alloca store") ? static_cast
<void> (0) : __assert_fail ("DL.getTypeStoreSize(Ty) + Offset <= DL.getTypeStoreSize(IntTy) && \"Element store outside of alloca store\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2165, __PRETTY_FUNCTION__));
uint64_t ShAmt = 8 * Offset;
if (DL.isBigEndian())
  ShAmt = 8 * (DL.getTypeStoreSize(IntTy) - DL.getTypeStoreSize(Ty) - Offset);
if (ShAmt) {
  V = IRB.CreateShl(V, ShAmt, Name + ".shift");
  LLVM_DEBUG(dbgs() << "     shifted: " << *V << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "     shifted: " << *V <<
 "\n"; } } while (false);
}

if (ShAmt || Ty->getBitWidth() < IntTy->getBitWidth()) {
  APInt Mask = ~Ty->getMask().zext(IntTy->getBitWidth()).shl(ShAmt);
  Old = IRB.CreateAnd(Old, Mask, Name + ".mask");
  LLVM_DEBUG(dbgs() << "      masked: " << *Old << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "      masked: " << *Old <<
 "\n"; } } while (false);
  V = IRB.CreateOr(Old, V, Name + ".insert");
  LLVM_DEBUG(dbgs() << "    inserted: " << *V << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    inserted: " << *V <<
 "\n"; } } while (false);
}
return V;
2182}

2184static Value *extractVector(IRBuilderTy &IRB, Value *V, unsigned BeginIndex,
                          unsigned EndIndex, const Twine &Name) {
VectorType *VecTy = cast<VectorType>(V->getType());
unsigned NumElements = EndIndex - BeginIndex;
assert(NumElements <= VecTy->getNumElements() && "Too many elements!")((NumElements <= VecTy->getNumElements() && "Too many elements!"
) ? static_cast<void> (0) : __assert_fail ("NumElements <= VecTy->getNumElements() && \"Too many elements!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2188, __PRETTY_FUNCTION__));

if (NumElements == VecTy->getNumElements())
  return V;

if (NumElements == 1) {
  V = IRB.CreateExtractElement(V, IRB.getInt32(BeginIndex),
                               Name + ".extract");
  LLVM_DEBUG(dbgs() << "     extract: " << *V << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "     extract: " << *V <<
 "\n"; } } while (false);
  return V;
}

SmallVector<Constant *, 8> Mask;
Mask.reserve(NumElements);
for (unsigned i = BeginIndex; i != EndIndex; ++i)
  Mask.push_back(IRB.getInt32(i));
V = IRB.CreateShuffleVector(V, UndefValue::get(V->getType()),
                            ConstantVector::get(Mask), Name + ".extract");
LLVM_DEBUG(dbgs() << "     shuffle: " << *V << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "     shuffle: " << *V <<
 "\n"; } } while (false);
return V;
2208}

2210static Value *insertVector(IRBuilderTy &IRB, Value *Old, Value *V,
                         unsigned BeginIndex, const Twine &Name) {
VectorType *VecTy = cast<VectorType>(Old->getType());
assert(VecTy && "Can only insert a vector into a vector")((VecTy && "Can only insert a vector into a vector") ?
 static_cast<void> (0) : __assert_fail ("VecTy && \"Can only insert a vector into a vector\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2213, __PRETTY_FUNCTION__));

VectorType *Ty = dyn_cast<VectorType>(V->getType());
if (!Ty) {
  // Single element to insert.
  V = IRB.CreateInsertElement(Old, V, IRB.getInt32(BeginIndex),
                              Name + ".insert");
  LLVM_DEBUG(dbgs() << "     insert: " << *V << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "     insert: " << *V <<
 "\n"; } } while (false);
  return V;
}

assert(Ty->getNumElements() <= VecTy->getNumElements() &&((Ty->getNumElements() <= VecTy->getNumElements() &&
 "Too many elements!") ? static_cast<void> (0) : __assert_fail
 ("Ty->getNumElements() <= VecTy->getNumElements() && \"Too many elements!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2225, __PRETTY_FUNCTION__))
       "Too many elements!")((Ty->getNumElements() <= VecTy->getNumElements() &&
 "Too many elements!") ? static_cast<void> (0) : __assert_fail
 ("Ty->getNumElements() <= VecTy->getNumElements() && \"Too many elements!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2225, __PRETTY_FUNCTION__));
if (Ty->getNumElements() == VecTy->getNumElements()) {
  assert(V->getType() == VecTy && "Vector type mismatch")((V->getType() == VecTy && "Vector type mismatch")
 ? static_cast<void> (0) : __assert_fail ("V->getType() == VecTy && \"Vector type mismatch\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2227, __PRETTY_FUNCTION__));
  return V;
}
unsigned EndIndex = BeginIndex + Ty->getNumElements();

// When inserting a smaller vector into the larger to store, we first
// use a shuffle vector to widen it with undef elements, and then
// a second shuffle vector to select between the loaded vector and the
// incoming vector.
SmallVector<Constant *, 8> Mask;
Mask.reserve(VecTy->getNumElements());
for (unsigned i = 0; i != VecTy->getNumElements(); ++i)
  if (i >= BeginIndex && i < EndIndex)
    Mask.push_back(IRB.getInt32(i - BeginIndex));
  else
    Mask.push_back(UndefValue::get(IRB.getInt32Ty()));
V = IRB.CreateShuffleVector(V, UndefValue::get(V->getType()),
                            ConstantVector::get(Mask), Name + ".expand");
LLVM_DEBUG(dbgs() << "    shuffle: " << *V << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    shuffle: " << *V <<
 "\n"; } } while (false);

Mask.clear();
for (unsigned i = 0; i != VecTy->getNumElements(); ++i)
  Mask.push_back(IRB.getInt1(i >= BeginIndex && i < EndIndex));

V = IRB.CreateSelect(ConstantVector::get(Mask), V, Old, Name + "blend");

LLVM_DEBUG(dbgs() << "    blend: " << *V << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    blend: " << *V <<
 "\n"; } } while (false);
return V;
2255}

2257/// Visitor to rewrite instructions using p particular slice of an alloca
2258/// to use a new alloca.
2259///
2260/// Also implements the rewriting to vector-based accesses when the partition
2261/// passes the isVectorPromotionViable predicate. Most of the rewriting logic
2262/// lives here.
2263class llvm::sroa::AllocaSliceRewriter
  : public InstVisitor<AllocaSliceRewriter, bool> {
// Befriend the base class so it can delegate to private visit methods.
friend class InstVisitor<AllocaSliceRewriter, bool>;

using Base = InstVisitor<AllocaSliceRewriter, bool>;

const DataLayout &DL;
AllocaSlices &AS;
SROA &Pass;
AllocaInst &OldAI, &NewAI;
const uint64_t NewAllocaBeginOffset, NewAllocaEndOffset;
Type *NewAllocaTy;

// This is a convenience and flag variable that will be null unless the new
// alloca's integer operations should be widened to this integer type due to
// passing isIntegerWideningViable above. If it is non-null, the desired
// integer type will be stored here for easy access during rewriting.
IntegerType *IntTy;

// If we are rewriting an alloca partition which can be written as pure
// vector operations, we stash extra information here. When VecTy is
// non-null, we have some strict guarantees about the rewritten alloca:
//   - The new alloca is exactly the size of the vector type here.
//   - The accesses all either map to the entire vector or to a single
//     element.
//   - The set of accessing instructions is only one of those handled above
//     in isVectorPromotionViable. Generally these are the same access kinds
//     which are promotable via mem2reg.
VectorType *VecTy;
Type *ElementTy;
uint64_t ElementSize;

// The original offset of the slice currently being rewritten relative to
// the original alloca.
uint64_t BeginOffset = 0;
uint64_t EndOffset = 0;

// The new offsets of the slice currently being rewritten relative to the
// original alloca.
uint64_t NewBeginOffset, NewEndOffset;

uint64_t SliceSize;
bool IsSplittable = false;
bool IsSplit = false;
Use *OldUse = nullptr;
Instruction *OldPtr = nullptr;

// Track post-rewrite users which are PHI nodes and Selects.
SmallSetVector<PHINode *, 8> &PHIUsers;
SmallSetVector<SelectInst *, 8> &SelectUsers;

// Utility IR builder, whose name prefix is setup for each visited use, and
// the insertion point is set to point to the user.
IRBuilderTy IRB;

2319public:
AllocaSliceRewriter(const DataLayout &DL, AllocaSlices &AS, SROA &Pass,
                    AllocaInst &OldAI, AllocaInst &NewAI,
                    uint64_t NewAllocaBeginOffset,
                    uint64_t NewAllocaEndOffset, bool IsIntegerPromotable,
                    VectorType *PromotableVecTy,
                    SmallSetVector<PHINode *, 8> &PHIUsers,
                    SmallSetVector<SelectInst *, 8> &SelectUsers)
    : DL(DL), AS(AS), Pass(Pass), OldAI(OldAI), NewAI(NewAI),
      NewAllocaBeginOffset(NewAllocaBeginOffset),
      NewAllocaEndOffset(NewAllocaEndOffset),
      NewAllocaTy(NewAI.getAllocatedType()),
      IntTy(IsIntegerPromotable
                ? Type::getIntNTy(
                      NewAI.getContext(),
                      DL.getTypeSizeInBits(NewAI.getAllocatedType()))
                : nullptr),
      VecTy(PromotableVecTy),
      ElementTy(VecTy ? VecTy->getElementType() : nullptr),
      ElementSize(VecTy ? DL.getTypeSizeInBits(ElementTy) / 8 : 0),
      PHIUsers(PHIUsers), SelectUsers(SelectUsers),
      IRB(NewAI.getContext(), ConstantFolder()) {
  if (VecTy) {
    assert((DL.getTypeSizeInBits(ElementTy) % 8) == 0 &&(((DL.getTypeSizeInBits(ElementTy) % 8) == 0 && "Only multiple-of-8 sized vector elements are viable"
) ? static_cast<void> (0) : __assert_fail ("(DL.getTypeSizeInBits(ElementTy) % 8) == 0 && \"Only multiple-of-8 sized vector elements are viable\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2343, __PRETTY_FUNCTION__))
           "Only multiple-of-8 sized vector elements are viable")(((DL.getTypeSizeInBits(ElementTy) % 8) == 0 && "Only multiple-of-8 sized vector elements are viable"
) ? static_cast<void> (0) : __assert_fail ("(DL.getTypeSizeInBits(ElementTy) % 8) == 0 && \"Only multiple-of-8 sized vector elements are viable\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2343, __PRETTY_FUNCTION__));
    ++NumVectorized;
  }
  assert((!IntTy && !VecTy) || (IntTy && !VecTy) || (!IntTy && VecTy))(((!IntTy && !VecTy) || (IntTy && !VecTy) || (
!IntTy && VecTy)) ? static_cast<void> (0) : __assert_fail
 ("(!IntTy && !VecTy) || (IntTy && !VecTy) || (!IntTy && VecTy)"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2346, __PRETTY_FUNCTION__));
}

bool visit(AllocaSlices::const_iterator I) {
  bool CanSROA = true;
  BeginOffset = I->beginOffset();
  EndOffset = I->endOffset();
  IsSplittable = I->isSplittable();
  IsSplit =
      BeginOffset < NewAllocaBeginOffset || EndOffset > NewAllocaEndOffset;
  LLVM_DEBUG(dbgs() << "  rewriting " << (IsSplit ? "split " : ""))do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "  rewriting " << (IsSplit ?
 "split " : ""); } } while (false);
  LLVM_DEBUG(AS.printSlice(dbgs(), I, ""))do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { AS.printSlice(dbgs(), I, ""); } } while (false);
  LLVM_DEBUG(dbgs() << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "\n"; } } while (false);

  // Compute the intersecting offset range.
  assert(BeginOffset < NewAllocaEndOffset)((BeginOffset < NewAllocaEndOffset) ? static_cast<void>
 (0) : __assert_fail ("BeginOffset < NewAllocaEndOffset", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2361, __PRETTY_FUNCTION__));
  assert(EndOffset > NewAllocaBeginOffset)((EndOffset > NewAllocaBeginOffset) ? static_cast<void>
 (0) : __assert_fail ("EndOffset > NewAllocaBeginOffset", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2362, __PRETTY_FUNCTION__));
  NewBeginOffset = std::max(BeginOffset, NewAllocaBeginOffset);
  NewEndOffset = std::min(EndOffset, NewAllocaEndOffset);

  SliceSize = NewEndOffset - NewBeginOffset;

  OldUse = I->getUse();
  OldPtr = cast<Instruction>(OldUse->get());

  Instruction *OldUserI = cast<Instruction>(OldUse->getUser());
  IRB.SetInsertPoint(OldUserI);
  IRB.SetCurrentDebugLocation(OldUserI->getDebugLoc());
  IRB.SetNamePrefix(Twine(NewAI.getName()) + "." + Twine(BeginOffset) + ".");

  CanSROA &= visit(cast<Instruction>(OldUse->getUser()));
  if (VecTy || IntTy)
    assert(CanSROA)((CanSROA) ? static_cast<void> (0) : __assert_fail ("CanSROA"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2378, __PRETTY_FUNCTION__));
  return CanSROA;
}

2382private:
// Make sure the other visit overloads are visible.
using Base::visit;

// Every instruction which can end up as a user must have a rewrite rule.
bool visitInstruction(Instruction &I) {
  LLVM_DEBUG(dbgs() << "    !!!! Cannot rewrite: " << I << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    !!!! Cannot rewrite: " <<
 I << "\n"; } } while (false);
  llvm_unreachable("No rewrite rule for this instruction!")::llvm::llvm_unreachable_internal("No rewrite rule for this instruction!"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2389);
}

Value *getNewAllocaSlicePtr(IRBuilderTy &IRB, Type *PointerTy) {
  // Note that the offset computation can use BeginOffset or NewBeginOffset
  // interchangeably for unsplit slices.
  assert(IsSplit || BeginOffset == NewBeginOffset)((IsSplit || BeginOffset == NewBeginOffset) ? static_cast<
void> (0) : __assert_fail ("IsSplit || BeginOffset == NewBeginOffset"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2395, __PRETTY_FUNCTION__));
  uint64_t Offset = NewBeginOffset - NewAllocaBeginOffset;

2398#ifndef NDEBUG
  StringRef OldName = OldPtr->getName();
  // Skip through the last '.sroa.' component of the name.
  size_t LastSROAPrefix = OldName.rfind(".sroa.");
  if (LastSROAPrefix != StringRef::npos) {
    OldName = OldName.substr(LastSROAPrefix + strlen(".sroa."));
    // Look for an SROA slice index.
    size_t IndexEnd = OldName.find_first_not_of("0123456789");
    if (IndexEnd != StringRef::npos && OldName[IndexEnd] == '.') {
      // Strip the index and look for the offset.
      OldName = OldName.substr(IndexEnd + 1);
      size_t OffsetEnd = OldName.find_first_not_of("0123456789");
      if (OffsetEnd != StringRef::npos && OldName[OffsetEnd] == '.')
        // Strip the offset.
        OldName = OldName.substr(OffsetEnd + 1);
    }
  }
  // Strip any SROA suffixes as well.
  OldName = OldName.substr(0, OldName.find(".sroa_"));
2417#endif

  return getAdjustedPtr(IRB, DL, &NewAI,
                        APInt(DL.getIndexTypeSizeInBits(PointerTy), Offset),
                        PointerTy,
2422#ifndef NDEBUG
                        Twine(OldName) + "."
2424#else
                        Twine()
2426#endif
                        );
}

/// Compute suitable alignment to access this slice of the *new*
/// alloca.
///
/// You can optionally pass a type to this routine and if that type's ABI
/// alignment is itself suitable, this will return zero.
unsigned getSliceAlign(Type *Ty = nullptr) {
  unsigned NewAIAlign = NewAI.getAlignment();
  if (!NewAIAlign)
    NewAIAlign = DL.getABITypeAlignment(NewAI.getAllocatedType());
  unsigned Align =
      MinAlign(NewAIAlign, NewBeginOffset - NewAllocaBeginOffset);
  return (Ty && Align == DL.getABITypeAlignment(Ty)) ? 0 : Align;
}

unsigned getIndex(uint64_t Offset) {
  assert(VecTy && "Can only call getIndex when rewriting a vector")((VecTy && "Can only call getIndex when rewriting a vector"
) ? static_cast<void> (0) : __assert_fail ("VecTy && \"Can only call getIndex when rewriting a vector\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2445, __PRETTY_FUNCTION__));
  uint64_t RelOffset = Offset - NewAllocaBeginOffset;
  assert(RelOffset / ElementSize < UINT32_MAX && "Index out of bounds")((RelOffset / ElementSize < (4294967295U) && "Index out of bounds"
) ? static_cast<void> (0) : __assert_fail ("RelOffset / ElementSize < UINT32_MAX && \"Index out of bounds\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2447, __PRETTY_FUNCTION__));
  uint32_t Index = RelOffset / ElementSize;
  assert(Index * ElementSize == RelOffset)((Index * ElementSize == RelOffset) ? static_cast<void>
 (0) : __assert_fail ("Index * ElementSize == RelOffset", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2449, __PRETTY_FUNCTION__));
  return Index;
}

void deleteIfTriviallyDead(Value *V) {
  Instruction *I = cast<Instruction>(V);
  if (isInstructionTriviallyDead(I))
    Pass.DeadInsts.insert(I);
}

Value *rewriteVectorizedLoadInst() {
  unsigned BeginIndex = getIndex(NewBeginOffset);
  unsigned EndIndex = getIndex(NewEndOffset);
  assert(EndIndex > BeginIndex && "Empty vector!")((EndIndex > BeginIndex && "Empty vector!") ? static_cast
<void> (0) : __assert_fail ("EndIndex > BeginIndex && \"Empty vector!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2462, __PRETTY_FUNCTION__));

  Value *V = IRB.CreateAlignedLoad(NewAI.getAllocatedType(), &NewAI,
                                   NewAI.getAlignment(), "load");
  return extractVector(IRB, V, BeginIndex, EndIndex, "vec");
}

Value *rewriteIntegerLoad(LoadInst &LI) {
  assert(IntTy && "We cannot insert an integer to the alloca")((IntTy && "We cannot insert an integer to the alloca"
) ? static_cast<void> (0) : __assert_fail ("IntTy && \"We cannot insert an integer to the alloca\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2470, __PRETTY_FUNCTION__));
  assert(!LI.isVolatile())((!LI.isVolatile()) ? static_cast<void> (0) : __assert_fail
 ("!LI.isVolatile()", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2471, __PRETTY_FUNCTION__));
  Value *V = IRB.CreateAlignedLoad(NewAI.getAllocatedType(), &NewAI,
                                   NewAI.getAlignment(), "load");
  V = convertValue(DL, IRB, V, IntTy);
  assert(NewBeginOffset >= NewAllocaBeginOffset && "Out of bounds offset")((NewBeginOffset >= NewAllocaBeginOffset && "Out of bounds offset"
) ? static_cast<void> (0) : __assert_fail ("NewBeginOffset >= NewAllocaBeginOffset && \"Out of bounds offset\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2475, __PRETTY_FUNCTION__));
  uint64_t Offset = NewBeginOffset - NewAllocaBeginOffset;
  if (Offset > 0 || NewEndOffset < NewAllocaEndOffset) {
    IntegerType *ExtractTy = Type::getIntNTy(LI.getContext(), SliceSize * 8);
    V = extractInteger(DL, IRB, V, ExtractTy, Offset, "extract");
  }
  // It is possible that the extracted type is not the load type. This
  // happens if there is a load past the end of the alloca, and as
  // a consequence the slice is narrower but still a candidate for integer
  // lowering. To handle this case, we just zero extend the extracted
  // integer.
  assert(cast<IntegerType>(LI.getType())->getBitWidth() >= SliceSize * 8 &&((cast<IntegerType>(LI.getType())->getBitWidth() >=
 SliceSize * 8 && "Can only handle an extract for an overly wide load"
) ? static_cast<void> (0) : __assert_fail ("cast<IntegerType>(LI.getType())->getBitWidth() >= SliceSize * 8 && \"Can only handle an extract for an overly wide load\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2487, __PRETTY_FUNCTION__))
         "Can only handle an extract for an overly wide load")((cast<IntegerType>(LI.getType())->getBitWidth() >=
 SliceSize * 8 && "Can only handle an extract for an overly wide load"
) ? static_cast<void> (0) : __assert_fail ("cast<IntegerType>(LI.getType())->getBitWidth() >= SliceSize * 8 && \"Can only handle an extract for an overly wide load\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2487, __PRETTY_FUNCTION__));
  if (cast<IntegerType>(LI.getType())->getBitWidth() > SliceSize * 8)
    V = IRB.CreateZExt(V, LI.getType());
  return V;
}

bool visitLoadInst(LoadInst &LI) {
  LLVM_DEBUG(dbgs() << "    original: " << LI << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    original: " << LI <<
 "\n"; } } while (false);
  Value *OldOp = LI.getOperand(0);
  assert(OldOp == OldPtr)((OldOp == OldPtr) ? static_cast<void> (0) : __assert_fail
 ("OldOp == OldPtr", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2496, __PRETTY_FUNCTION__));

  AAMDNodes AATags;
  LI.getAAMetadata(AATags);

  unsigned AS = LI.getPointerAddressSpace();

  Type *TargetTy = IsSplit ? Type::getIntNTy(LI.getContext(), SliceSize * 8)
                           : LI.getType();
  const bool IsLoadPastEnd = DL.getTypeStoreSize(TargetTy) > SliceSize;
  bool IsPtrAdjusted = false;
  Value *V;
  if (VecTy) {
    V = rewriteVectorizedLoadInst();
  } else if (IntTy && LI.getType()->isIntegerTy()) {
    V = rewriteIntegerLoad(LI);
  } else if (NewBeginOffset == NewAllocaBeginOffset &&
             NewEndOffset == NewAllocaEndOffset &&
             (canConvertValue(DL, NewAllocaTy, TargetTy) ||
              (IsLoadPastEnd && NewAllocaTy->isIntegerTy() &&
               TargetTy->isIntegerTy()))) {
    LoadInst *NewLI = IRB.CreateAlignedLoad(NewAI.getAllocatedType(), &NewAI,
                                            NewAI.getAlignment(),
                                            LI.isVolatile(), LI.getName());
    if (AATags)
      NewLI->setAAMetadata(AATags);
    if (LI.isVolatile())
      NewLI->setAtomic(LI.getOrdering(), LI.getSyncScopeID());

    // Any !nonnull metadata or !range metadata on the old load is also valid
    // on the new load. This is even true in some cases even when the loads
    // are different types, for example by mapping !nonnull metadata to
    // !range metadata by modeling the null pointer constant converted to the
    // integer type.
    // FIXME: Add support for range metadata here. Currently the utilities
    // for this don't propagate range metadata in trivial cases from one
    // integer load to another, don't handle non-addrspace-0 null pointers
    // correctly, and don't have any support for mapping ranges as the
    // integer type becomes winder or narrower.
    if (MDNode *N = LI.getMetadata(LLVMContext::MD_nonnull))
      copyNonnullMetadata(LI, N, *NewLI);

    // Try to preserve nonnull metadata
    V = NewLI;

    // If this is an integer load past the end of the slice (which means the
    // bytes outside the slice are undef or this load is dead) just forcibly
    // fix the integer size with correct handling of endianness.
    if (auto *AITy = dyn_cast<IntegerType>(NewAllocaTy))
      if (auto *TITy = dyn_cast<IntegerType>(TargetTy))
        if (AITy->getBitWidth() < TITy->getBitWidth()) {
          V = IRB.CreateZExt(V, TITy, "load.ext");
          if (DL.isBigEndian())
            V = IRB.CreateShl(V, TITy->getBitWidth() - AITy->getBitWidth(),
                              "endian_shift");
        }
  } else {
    Type *LTy = TargetTy->getPointerTo(AS);
    LoadInst *NewLI = IRB.CreateAlignedLoad(
        TargetTy, getNewAllocaSlicePtr(IRB, LTy), getSliceAlign(TargetTy),
        LI.isVolatile(), LI.getName());
    if (AATags)
      NewLI->setAAMetadata(AATags);
    if (LI.isVolatile())
      NewLI->setAtomic(LI.getOrdering(), LI.getSyncScopeID());

    V = NewLI;
    IsPtrAdjusted = true;
  }
  V = convertValue(DL, IRB, V, TargetTy);

  if (IsSplit) {
    assert(!LI.isVolatile())((!LI.isVolatile()) ? static_cast<void> (0) : __assert_fail
 ("!LI.isVolatile()", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2568, __PRETTY_FUNCTION__));
    assert(LI.getType()->isIntegerTy() &&((LI.getType()->isIntegerTy() && "Only integer type loads and stores are split"
) ? static_cast<void> (0) : __assert_fail ("LI.getType()->isIntegerTy() && \"Only integer type loads and stores are split\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2570, __PRETTY_FUNCTION__))
           "Only integer type loads and stores are split")((LI.getType()->isIntegerTy() && "Only integer type loads and stores are split"
) ? static_cast<void> (0) : __assert_fail ("LI.getType()->isIntegerTy() && \"Only integer type loads and stores are split\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2570, __PRETTY_FUNCTION__));
    assert(SliceSize < DL.getTypeStoreSize(LI.getType()) &&((SliceSize < DL.getTypeStoreSize(LI.getType()) &&
 "Split load isn't smaller than original load") ? static_cast
<void> (0) : __assert_fail ("SliceSize < DL.getTypeStoreSize(LI.getType()) && \"Split load isn't smaller than original load\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2572, __PRETTY_FUNCTION__))
           "Split load isn't smaller than original load")((SliceSize < DL.getTypeStoreSize(LI.getType()) &&
 "Split load isn't smaller than original load") ? static_cast
<void> (0) : __assert_fail ("SliceSize < DL.getTypeStoreSize(LI.getType()) && \"Split load isn't smaller than original load\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2572, __PRETTY_FUNCTION__));
    assert(DL.typeSizeEqualsStoreSize(LI.getType()) &&((DL.typeSizeEqualsStoreSize(LI.getType()) && "Non-byte-multiple bit width"
) ? static_cast<void> (0) : __assert_fail ("DL.typeSizeEqualsStoreSize(LI.getType()) && \"Non-byte-multiple bit width\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2574, __PRETTY_FUNCTION__))
           "Non-byte-multiple bit width")((DL.typeSizeEqualsStoreSize(LI.getType()) && "Non-byte-multiple bit width"
) ? static_cast<void> (0) : __assert_fail ("DL.typeSizeEqualsStoreSize(LI.getType()) && \"Non-byte-multiple bit width\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2574, __PRETTY_FUNCTION__));
    // Move the insertion point just past the load so that we can refer to it.
    IRB.SetInsertPoint(&*std::next(BasicBlock::iterator(&LI)));
    // Create a placeholder value with the same type as LI to use as the
    // basis for the new value. This allows us to replace the uses of LI with
    // the computed value, and then replace the placeholder with LI, leaving
    // LI only used for this computation.
    Value *Placeholder = new LoadInst(
        LI.getType(), UndefValue::get(LI.getType()->getPointerTo(AS)));
    V = insertInteger(DL, IRB, Placeholder, V, NewBeginOffset - BeginOffset,
                      "insert");
    LI.replaceAllUsesWith(V);
    Placeholder->replaceAllUsesWith(&LI);
    Placeholder->deleteValue();
  } else {
    LI.replaceAllUsesWith(V);
  }

  Pass.DeadInsts.insert(&LI);
  deleteIfTriviallyDead(OldOp);
  LLVM_DEBUG(dbgs() << "          to: " << *V << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "          to: " << *V <<
 "\n"; } } while (false);
  return !LI.isVolatile() && !IsPtrAdjusted;
}

bool rewriteVectorizedStoreInst(Value *V, StoreInst &SI, Value *OldOp,
                                AAMDNodes AATags) {
  if (V->getType() != VecTy) {
    unsigned BeginIndex = getIndex(NewBeginOffset);
    unsigned EndIndex = getIndex(NewEndOffset);
    assert(EndIndex > BeginIndex && "Empty vector!")((EndIndex > BeginIndex && "Empty vector!") ? static_cast
<void> (0) : __assert_fail ("EndIndex > BeginIndex && \"Empty vector!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2603, __PRETTY_FUNCTION__));
    unsigned NumElements = EndIndex - BeginIndex;
    assert(NumElements <= VecTy->getNumElements() && "Too many elements!")((NumElements <= VecTy->getNumElements() && "Too many elements!"
) ? static_cast<void> (0) : __assert_fail ("NumElements <= VecTy->getNumElements() && \"Too many elements!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2605, __PRETTY_FUNCTION__));
    Type *SliceTy = (NumElements == 1)
                        ? ElementTy
                        : VectorType::get(ElementTy, NumElements);
    if (V->getType() != SliceTy)
      V = convertValue(DL, IRB, V, SliceTy);

    // Mix in the existing elements.
    Value *Old = IRB.CreateAlignedLoad(NewAI.getAllocatedType(), &NewAI,
                                       NewAI.getAlignment(), "load");
    V = insertVector(IRB, Old, V, BeginIndex, "vec");
  }
  StoreInst *Store = IRB.CreateAlignedStore(V, &NewAI, NewAI.getAlignment());
  if (AATags)
    Store->setAAMetadata(AATags);
  Pass.DeadInsts.insert(&SI);

  LLVM_DEBUG(dbgs() << "          to: " << *Store << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "          to: " << *Store <<
 "\n"; } } while (false);
  return true;
}

bool rewriteIntegerStore(Value *V, StoreInst &SI, AAMDNodes AATags) {
  assert(IntTy && "We cannot extract an integer from the alloca")((IntTy && "We cannot extract an integer from the alloca"
) ? static_cast<void> (0) : __assert_fail ("IntTy && \"We cannot extract an integer from the alloca\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2627, __PRETTY_FUNCTION__));
  assert(!SI.isVolatile())((!SI.isVolatile()) ? static_cast<void> (0) : __assert_fail
 ("!SI.isVolatile()", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2628, __PRETTY_FUNCTION__));
  if (DL.getTypeSizeInBits(V->getType()) != IntTy->getBitWidth()) {
    Value *Old = IRB.CreateAlignedLoad(NewAI.getAllocatedType(), &NewAI,
                                       NewAI.getAlignment(), "oldload");
    Old = convertValue(DL, IRB, Old, IntTy);
    assert(BeginOffset >= NewAllocaBeginOffset && "Out of bounds offset")((BeginOffset >= NewAllocaBeginOffset && "Out of bounds offset"
) ? static_cast<void> (0) : __assert_fail ("BeginOffset >= NewAllocaBeginOffset && \"Out of bounds offset\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2633, __PRETTY_FUNCTION__));
    uint64_t Offset = BeginOffset - NewAllocaBeginOffset;
    V = insertInteger(DL, IRB, Old, SI.getValueOperand(), Offset, "insert");
  }
  V = convertValue(DL, IRB, V, NewAllocaTy);
  StoreInst *Store = IRB.CreateAlignedStore(V, &NewAI, NewAI.getAlignment());
  Store->copyMetadata(SI, {LLVMContext::MD_mem_parallel_loop_access,
                           LLVMContext::MD_access_group});
  if (AATags)
    Store->setAAMetadata(AATags);
  Pass.DeadInsts.insert(&SI);
  LLVM_DEBUG(dbgs() << "          to: " << *Store << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "          to: " << *Store <<
 "\n"; } } while (false);
  return true;
}

bool visitStoreInst(StoreInst &SI) {
  LLVM_DEBUG(dbgs() << "    original: " << SI << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    original: " << SI <<
 "\n"; } } while (false);
  Value *OldOp = SI.getOperand(1);
  assert(OldOp == OldPtr)((OldOp == OldPtr) ? static_cast<void> (0) : __assert_fail
 ("OldOp == OldPtr", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2651, __PRETTY_FUNCTION__));

  AAMDNodes AATags;
  SI.getAAMetadata(AATags);

  Value *V = SI.getValueOperand();

  // Strip all inbounds GEPs and pointer casts to try to dig out any root
  // alloca that should be re-examined after promoting this alloca.
  if (V->getType()->isPointerTy())
    if (AllocaInst *AI = dyn_cast<AllocaInst>(V->stripInBoundsOffsets()))
      Pass.PostPromotionWorklist.insert(AI);

  if (SliceSize < DL.getTypeStoreSize(V->getType())) {
    assert(!SI.isVolatile())((!SI.isVolatile()) ? static_cast<void> (0) : __assert_fail
 ("!SI.isVolatile()", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2665, __PRETTY_FUNCTION__));
    assert(V->getType()->isIntegerTy() &&((V->getType()->isIntegerTy() && "Only integer type loads and stores are split"
) ? static_cast<void> (0) : __assert_fail ("V->getType()->isIntegerTy() && \"Only integer type loads and stores are split\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2667, __PRETTY_FUNCTION__))
           "Only integer type loads and stores are split")((V->getType()->isIntegerTy() && "Only integer type loads and stores are split"
) ? static_cast<void> (0) : __assert_fail ("V->getType()->isIntegerTy() && \"Only integer type loads and stores are split\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2667, __PRETTY_FUNCTION__));
    assert(DL.typeSizeEqualsStoreSize(V->getType()) &&((DL.typeSizeEqualsStoreSize(V->getType()) && "Non-byte-multiple bit width"
) ? static_cast<void> (0) : __assert_fail ("DL.typeSizeEqualsStoreSize(V->getType()) && \"Non-byte-multiple bit width\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2669, __PRETTY_FUNCTION__))
           "Non-byte-multiple bit width")((DL.typeSizeEqualsStoreSize(V->getType()) && "Non-byte-multiple bit width"
) ? static_cast<void> (0) : __assert_fail ("DL.typeSizeEqualsStoreSize(V->getType()) && \"Non-byte-multiple bit width\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2669, __PRETTY_FUNCTION__));
    IntegerType *NarrowTy = Type::getIntNTy(SI.getContext(), SliceSize * 8);
    V = extractInteger(DL, IRB, V, NarrowTy, NewBeginOffset - BeginOffset,
                       "extract");
  }

  if (VecTy)
    return rewriteVectorizedStoreInst(V, SI, OldOp, AATags);
  if (IntTy && V->getType()->isIntegerTy())
    return rewriteIntegerStore(V, SI, AATags);

  const bool IsStorePastEnd = DL.getTypeStoreSize(V->getType()) > SliceSize;
  StoreInst *NewSI;
  if (NewBeginOffset == NewAllocaBeginOffset &&
      NewEndOffset == NewAllocaEndOffset &&
      (canConvertValue(DL, V->getType(), NewAllocaTy) ||
       (IsStorePastEnd && NewAllocaTy->isIntegerTy() &&
        V->getType()->isIntegerTy()))) {
    // If this is an integer store past the end of slice (and thus the bytes
    // past that point are irrelevant or this is unreachable), truncate the
    // value prior to storing.
    if (auto *VITy = dyn_cast<IntegerType>(V->getType()))
      if (auto *AITy = dyn_cast<IntegerType>(NewAllocaTy))
        if (VITy->getBitWidth() > AITy->getBitWidth()) {
          if (DL.isBigEndian())
            V = IRB.CreateLShr(V, VITy->getBitWidth() - AITy->getBitWidth(),
                               "endian_shift");
          V = IRB.CreateTrunc(V, AITy, "load.trunc");
        }

    V = convertValue(DL, IRB, V, NewAllocaTy);
    NewSI = IRB.CreateAlignedStore(V, &NewAI, NewAI.getAlignment(),
                                   SI.isVolatile());
  } else {
    unsigned AS = SI.getPointerAddressSpace();
    Value *NewPtr = getNewAllocaSlicePtr(IRB, V->getType()->getPointerTo(AS));
    NewSI = IRB.CreateAlignedStore(V, NewPtr, getSliceAlign(V->getType()),
                                   SI.isVolatile());
  }
  NewSI->copyMetadata(SI, {LLVMContext::MD_mem_parallel_loop_access,
                           LLVMContext::MD_access_group});
  if (AATags)
    NewSI->setAAMetadata(AATags);
  if (SI.isVolatile())
    NewSI->setAtomic(SI.getOrdering(), SI.getSyncScopeID());
  Pass.DeadInsts.insert(&SI);
  deleteIfTriviallyDead(OldOp);

  LLVM_DEBUG(dbgs() << "          to: " << *NewSI << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "          to: " << *NewSI <<
 "\n"; } } while (false);
  return NewSI->getPointerOperand() == &NewAI && !SI.isVolatile();
}

/// Compute an integer value from splatting an i8 across the given
/// number of bytes.
///
/// Note that this routine assumes an i8 is a byte. If that isn't true, don't
/// call this routine.
/// FIXME: Heed the advice above.
///
/// \param V The i8 value to splat.
/// \param Size The number of bytes in the output (assuming i8 is one byte)
Value *getIntegerSplat(Value *V, unsigned Size) {
  assert(Size > 0 && "Expected a positive number of bytes.")((Size > 0 && "Expected a positive number of bytes."
) ? static_cast<void> (0) : __assert_fail ("Size > 0 && \"Expected a positive number of bytes.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2731, __PRETTY_FUNCTION__));
  IntegerType *VTy = cast<IntegerType>(V->getType());
  assert(VTy->getBitWidth() == 8 && "Expected an i8 value for the byte")((VTy->getBitWidth() == 8 && "Expected an i8 value for the byte"
) ? static_cast<void> (0) : __assert_fail ("VTy->getBitWidth() == 8 && \"Expected an i8 value for the byte\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2733, __PRETTY_FUNCTION__));
  if (Size == 1)
    return V;

  Type *SplatIntTy = Type::getIntNTy(VTy->getContext(), Size * 8);
  V = IRB.CreateMul(
      IRB.CreateZExt(V, SplatIntTy, "zext"),
      ConstantExpr::getUDiv(
          Constant::getAllOnesValue(SplatIntTy),
          ConstantExpr::getZExt(Constant::getAllOnesValue(V->getType()),
                                SplatIntTy)),
      "isplat");
  return V;
}

/// Compute a vector splat for a given element value.
Value *getVectorSplat(Value *V, unsigned NumElements) {
  V = IRB.CreateVectorSplat(NumElements, V, "vsplat");
  LLVM_DEBUG(dbgs() << "       splat: " << *V << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "       splat: " << *V <<
 "\n"; } } while (false);
  return V;
}

bool visitMemSetInst(MemSetInst &II) {
  LLVM_DEBUG(dbgs() << "    original: " << II << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    original: " << II <<
 "\n"; } } while (false);
  assert(II.getRawDest() == OldPtr)((II.getRawDest() == OldPtr) ? static_cast<void> (0) : __assert_fail
 ("II.getRawDest() == OldPtr", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2757, __PRETTY_FUNCTION__));

  AAMDNodes AATags;
  II.getAAMetadata(AATags);

  // If the memset has a variable size, it cannot be split, just adjust the
  // pointer to the new alloca.
  if (!isa<Constant>(II.getLength())) {
    assert(!IsSplit)((!IsSplit) ? static_cast<void> (0) : __assert_fail ("!IsSplit"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2765, __PRETTY_FUNCTION__));
    assert(NewBeginOffset == BeginOffset)((NewBeginOffset == BeginOffset) ? static_cast<void> (0
) : __assert_fail ("NewBeginOffset == BeginOffset", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2766, __PRETTY_FUNCTION__));
    II.setDest(getNewAllocaSlicePtr(IRB, OldPtr->getType()));
    II.setDestAlignment(getSliceAlign());

    deleteIfTriviallyDead(OldPtr);
    return false;
  }

  // Record this instruction for deletion.
  Pass.DeadInsts.insert(&II);

  Type *AllocaTy = NewAI.getAllocatedType();
  Type *ScalarTy = AllocaTy->getScalarType();
  
  const bool CanContinue = [&]() {
    if (VecTy || IntTy)
      return true;
    if (BeginOffset > NewAllocaBeginOffset ||
        EndOffset < NewAllocaEndOffset)
      return false;
    auto *C = cast<ConstantInt>(II.getLength());
    if (C->getBitWidth() > 64)
      return false;
    const auto Len = C->getZExtValue();
    auto *Int8Ty = IntegerType::getInt8Ty(NewAI.getContext());
    auto *SrcTy = VectorType::get(Int8Ty, Len);
    return canConvertValue(DL, SrcTy, AllocaTy) &&
      DL.isLegalInteger(DL.getTypeSizeInBits(ScalarTy));
  }();

  // If this doesn't map cleanly onto the alloca type, and that type isn't
  // a single value type, just emit a memset.
  if (!CanContinue) {
    Type *SizeTy = II.getLength()->getType();
    Constant *Size = ConstantInt::get(SizeTy, NewEndOffset - NewBeginOffset);
    CallInst *New = IRB.CreateMemSet(
        getNewAllocaSlicePtr(IRB, OldPtr->getType()), II.getValue(), Size,
        getSliceAlign(), II.isVolatile());
    if (AATags)
      New->setAAMetadata(AATags);
    LLVM_DEBUG(dbgs() << "          to: " << *New << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "          to: " << *New <<
 "\n"; } } while (false);
    return false;
  }

  // If we can represent this as a simple value, we have to build the actual
  // value to store, which requires expanding the byte present in memset to
  // a sensible representation for the alloca type. This is essentially
  // splatting the byte to a sufficiently wide integer, splatting it across
  // any desired vector width, and bitcasting to the final type.
  Value *V;

  if (VecTy) {
    // If this is a memset of a vectorized alloca, insert it.
    assert(ElementTy == ScalarTy)((ElementTy == ScalarTy) ? static_cast<void> (0) : __assert_fail
 ("ElementTy == ScalarTy", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2819, __PRETTY_FUNCTION__));

    unsigned BeginIndex = getIndex(NewBeginOffset);
    unsigned EndIndex = getIndex(NewEndOffset);
    assert(EndIndex > BeginIndex && "Empty vector!")((EndIndex > BeginIndex && "Empty vector!") ? static_cast
<void> (0) : __assert_fail ("EndIndex > BeginIndex && \"Empty vector!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2823, __PRETTY_FUNCTION__));
    unsigned NumElements = EndIndex - BeginIndex;
    assert(NumElements <= VecTy->getNumElements() && "Too many elements!")((NumElements <= VecTy->getNumElements() && "Too many elements!"
) ? static_cast<void> (0) : __assert_fail ("NumElements <= VecTy->getNumElements() && \"Too many elements!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2825, __PRETTY_FUNCTION__));

    Value *Splat =
        getIntegerSplat(II.getValue(), DL.getTypeSizeInBits(ElementTy) / 8);
    Splat = convertValue(DL, IRB, Splat, ElementTy);
    if (NumElements > 1)
      Splat = getVectorSplat(Splat, NumElements);

    Value *Old = IRB.CreateAlignedLoad(NewAI.getAllocatedType(), &NewAI,
                                       NewAI.getAlignment(), "oldload");
    V = insertVector(IRB, Old, Splat, BeginIndex, "vec");
  } else if (IntTy) {
    // If this is a memset on an alloca where we can widen stores, insert the
    // set integer.
    assert(!II.isVolatile())((!II.isVolatile()) ? static_cast<void> (0) : __assert_fail
 ("!II.isVolatile()", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2839, __PRETTY_FUNCTION__));

    uint64_t Size = NewEndOffset - NewBeginOffset;
    V = getIntegerSplat(II.getValue(), Size);

    if (IntTy && (BeginOffset != NewAllocaBeginOffset ||
                  EndOffset != NewAllocaBeginOffset)) {
      Value *Old = IRB.CreateAlignedLoad(NewAI.getAllocatedType(), &NewAI,
                                         NewAI.getAlignment(), "oldload");
      Old = convertValue(DL, IRB, Old, IntTy);
      uint64_t Offset = NewBeginOffset - NewAllocaBeginOffset;
      V = insertInteger(DL, IRB, Old, V, Offset, "insert");
    } else {
      assert(V->getType() == IntTy &&((V->getType() == IntTy && "Wrong type for an alloca wide integer!"
) ? static_cast<void> (0) : __assert_fail ("V->getType() == IntTy && \"Wrong type for an alloca wide integer!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2853, __PRETTY_FUNCTION__))
             "Wrong type for an alloca wide integer!")((V->getType() == IntTy && "Wrong type for an alloca wide integer!"
) ? static_cast<void> (0) : __assert_fail ("V->getType() == IntTy && \"Wrong type for an alloca wide integer!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2853, __PRETTY_FUNCTION__));
    }
    V = convertValue(DL, IRB, V, AllocaTy);
  } else {
    // Established these invariants above.
    assert(NewBeginOffset == NewAllocaBeginOffset)((NewBeginOffset == NewAllocaBeginOffset) ? static_cast<void
> (0) : __assert_fail ("NewBeginOffset == NewAllocaBeginOffset"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2858, __PRETTY_FUNCTION__));
    assert(NewEndOffset == NewAllocaEndOffset)((NewEndOffset == NewAllocaEndOffset) ? static_cast<void>
 (0) : __assert_fail ("NewEndOffset == NewAllocaEndOffset", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2859, __PRETTY_FUNCTION__));

    V = getIntegerSplat(II.getValue(), DL.getTypeSizeInBits(ScalarTy) / 8);
    if (VectorType *AllocaVecTy = dyn_cast<VectorType>(AllocaTy))
      V = getVectorSplat(V, AllocaVecTy->getNumElements());

    V = convertValue(DL, IRB, V, AllocaTy);
  }

  StoreInst *New = IRB.CreateAlignedStore(V, &NewAI, NewAI.getAlignment(),
                                          II.isVolatile());
  if (AATags)
    New->setAAMetadata(AATags);
  LLVM_DEBUG(dbgs() << "          to: " << *New << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "          to: " << *New <<
 "\n"; } } while (false);
  return !II.isVolatile();
}

bool visitMemTransferInst(MemTransferInst &II) {
  // Rewriting of memory transfer instructions can be a bit tricky. We break
  // them into two categories: split intrinsics and unsplit intrinsics.

  LLVM_DEBUG(dbgs() << "    original: " << II << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    original: " << II <<
 "\n"; } } while (false);
1
Assuming 'DebugFlag' is false→
2
←
Loop condition is false.  Exiting loop→

  AAMDNodes AATags;
  II.getAAMetadata(AATags);

  bool IsDest = &II.getRawDestUse() == OldUse;
  assert3.1
'IsDest' is false
1
'IsDest' is false
1
'IsDest' is false
((IsDest && II.getRawDest() == OldPtr) ||(((IsDest && II.getRawDest() == OldPtr) || (!IsDest &&
 II.getRawSource() == OldPtr)) ? static_cast<void> (0) :
 __assert_fail ("(IsDest && II.getRawDest() == OldPtr) || (!IsDest && II.getRawSource() == OldPtr)"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2887, __PRETTY_FUNCTION__))
3
←
Assuming 'IsDest' is false→
4
←
Assuming the condition is true→
5
←
'?' condition is true→
         (!IsDest && II.getRawSource() == OldPtr))(((IsDest && II.getRawDest() == OldPtr) || (!IsDest &&
 II.getRawSource() == OldPtr)) ? static_cast<void> (0) :
 __assert_fail ("(IsDest && II.getRawDest() == OldPtr) || (!IsDest && II.getRawSource() == OldPtr)"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2887, __PRETTY_FUNCTION__));

  unsigned SliceAlign = getSliceAlign();

  // For unsplit intrinsics, we simply modify the source and destination
  // pointers in place. This isn't just an optimization, it is a matter of
  // correctness. With unsplit intrinsics we may be dealing with transfers
  // within a single alloca before SROA ran, or with transfers that have
  // a variable length. We may also be dealing with memmove instead of
  // memcpy, and so simply updating the pointers is the necessary for us to
  // update both source and dest of a single call.
  if (!IsSplittable) {
6
←
Assuming field 'IsSplittable' is true→
7
←
Taking false branch→
    Value *AdjustedPtr = getNewAllocaSlicePtr(IRB, OldPtr->getType());
    if (IsDest) {
      II.setDest(AdjustedPtr);
      II.setDestAlignment(SliceAlign);
    }
    else {
      II.setSource(AdjustedPtr);
      II.setSourceAlignment(SliceAlign);
    }

    LLVM_DEBUG(dbgs() << "          to: " << II << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "          to: " << II <<
 "\n"; } } while (false);
    deleteIfTriviallyDead(OldPtr);
    return false;
  }
  // For split transfer intrinsics we have an incredibly useful assurance:
  // the source and destination do not reside within the same alloca, and at
  // least one of them does not escape. This means that we can replace
  // memmove with memcpy, and we don't need to worry about all manner of
  // downsides to splitting and transforming the operations.

  // If this doesn't map cleanly onto the alloca type, and that type isn't
  // a single value type, just emit a memcpy.
  bool EmitMemCpy =
      !VecTy && !IntTy &&
8
←
Assuming field 'VecTy' is non-null→
      (BeginOffset > NewAllocaBeginOffset || EndOffset < NewAllocaEndOffset ||
       SliceSize != DL.getTypeStoreSize(NewAI.getAllocatedType()) ||
       !NewAI.getAllocatedType()->isSingleValueType());

  // If we're just going to emit a memcpy, the alloca hasn't changed, and the
  // size hasn't been shrunk based on analysis of the viable range, this is
  // a no-op.
  if (EmitMemCpy8.1
'EmitMemCpy' is false
1
'EmitMemCpy' is false
1
'EmitMemCpy' is false
 && &OldAI == &NewAI) {
    // Ensure the start lines up.
    assert(NewBeginOffset == BeginOffset)((NewBeginOffset == BeginOffset) ? static_cast<void> (0
) : __assert_fail ("NewBeginOffset == BeginOffset", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2932, __PRETTY_FUNCTION__));

    // Rewrite the size as needed.
    if (NewEndOffset != EndOffset)
      II.setLength(ConstantInt::get(II.getLength()->getType(),
                                    NewEndOffset - NewBeginOffset));
    return false;
  }
  // Record this instruction for deletion.
  Pass.DeadInsts.insert(&II);

  // Strip all inbounds GEPs and pointer casts to try to dig out any root
  // alloca that should be re-examined after rewriting this instruction.
  Value *OtherPtr = IsDest8.2
'IsDest' is false
2
'IsDest' is false
2
'IsDest' is false
 ? II.getRawSource() : II.getRawDest();
9
←
'?' condition is false→
  if (AllocaInst *AI10.1
'AI' is null
1
'AI' is null
1
'AI' is null
 =
11
←
Taking false branch→
          dyn_cast<AllocaInst>(OtherPtr->stripInBoundsOffsets())) {
10
←
Assuming the object is not a 'AllocaInst'→
    assert(AI != &OldAI && AI != &NewAI &&((AI != &OldAI && AI != &NewAI && "Splittable transfers cannot reach the same alloca on both ends."
) ? static_cast<void> (0) : __assert_fail ("AI != &OldAI && AI != &NewAI && \"Splittable transfers cannot reach the same alloca on both ends.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2949, __PRETTY_FUNCTION__))
           "Splittable transfers cannot reach the same alloca on both ends.")((AI != &OldAI && AI != &NewAI && "Splittable transfers cannot reach the same alloca on both ends."
) ? static_cast<void> (0) : __assert_fail ("AI != &OldAI && AI != &NewAI && \"Splittable transfers cannot reach the same alloca on both ends.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 2949, __PRETTY_FUNCTION__));
    Pass.Worklist.insert(AI);
  }

  Type *OtherPtrTy = OtherPtr->getType();
  unsigned OtherAS = OtherPtrTy->getPointerAddressSpace();

  // Compute the relative offset for the other pointer within the transfer.
  unsigned OffsetWidth = DL.getIndexSizeInBits(OtherAS);
  APInt OtherOffset(OffsetWidth, NewBeginOffset - BeginOffset);
  unsigned OtherAlign =
    IsDest11.1
'IsDest' is false
1
'IsDest' is false
1
'IsDest' is false
 ? II.getSourceAlignment() : II.getDestAlignment();
12
←
'?' condition is false→
  OtherAlign =  MinAlign(OtherAlign12.1
'OtherAlign' is 0
1
'OtherAlign' is 0
1
'OtherAlign' is 0
 ? OtherAlign : 1,
13
←
'?' condition is false→
                         OtherOffset.zextOrTrunc(64).getZExtValue());

  if (EmitMemCpy13.1
'EmitMemCpy' is false
1
'EmitMemCpy' is false
1
'EmitMemCpy' is false
) {
14
←
Taking false branch→
    // Compute the other pointer, folding as much as possible to produce
    // a single, simple GEP in most cases.
    OtherPtr = getAdjustedPtr(IRB, DL, OtherPtr, OtherOffset, OtherPtrTy,
                              OtherPtr->getName() + ".");

    Value *OurPtr = getNewAllocaSlicePtr(IRB, OldPtr->getType());
    Type *SizeTy = II.getLength()->getType();
    Constant *Size = ConstantInt::get(SizeTy, NewEndOffset - NewBeginOffset);

    Value *DestPtr, *SrcPtr;
    unsigned DestAlign, SrcAlign;
    // Note: IsDest is true iff we're copying into the new alloca slice
    if (IsDest) {
      DestPtr = OurPtr;
      DestAlign = SliceAlign;
      SrcPtr = OtherPtr;
      SrcAlign = OtherAlign;
    } else {
      DestPtr = OtherPtr;
      DestAlign = OtherAlign;
      SrcPtr = OurPtr;
      SrcAlign = SliceAlign;
    }
    CallInst *New = IRB.CreateMemCpy(DestPtr, DestAlign, SrcPtr, SrcAlign,
                                     Size, II.isVolatile());
    if (AATags)
      New->setAAMetadata(AATags);
    LLVM_DEBUG(dbgs() << "          to: " << *New << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "          to: " << *New <<
 "\n"; } } while (false);
    return false;
  }

  bool IsWholeAlloca = NewBeginOffset == NewAllocaBeginOffset &&
15
←
Assuming field 'NewBeginOffset' is not equal to field 'NewAllocaBeginOffset'→
                       NewEndOffset == NewAllocaEndOffset;
  uint64_t Size = NewEndOffset - NewBeginOffset;
  unsigned BeginIndex = VecTy15.1
Field 'VecTy' is non-null
1
Field 'VecTy' is non-null
1
Field 'VecTy' is non-null
 ? getIndex(NewBeginOffset) : 0;
16
←
'?' condition is true→
  unsigned EndIndex = VecTy16.1
Field 'VecTy' is non-null
1
Field 'VecTy' is non-null
1
Field 'VecTy' is non-null
 ? getIndex(NewEndOffset) : 0;
17
←
'?' condition is true→
  unsigned NumElements = EndIndex - BeginIndex;
  IntegerType *SubIntTy =
20
←
'SubIntTy' initialized to a null pointer value→
      IntTy ? Type::getIntNTy(IntTy->getContext(), Size * 8) : nullptr;
18
←
Assuming field 'IntTy' is null→
19
←
'?' condition is false→

  // Reset the other pointer type to match the register type we're going to
  // use, but using the address space of the original other pointer.
  Type *OtherTy;
  if (VecTy20.1
Field 'VecTy' is non-null
1
Field 'VecTy' is non-null
1
Field 'VecTy' is non-null
 && !IsWholeAlloca20.2
'IsWholeAlloca' is false
2
'IsWholeAlloca' is false
2
'IsWholeAlloca' is false
) {
21
←
Taking true branch→
    if (NumElements == 1)
22
←
Assuming 'NumElements' is not equal to 1→
23
←
Taking false branch→
      OtherTy = VecTy->getElementType();
    else
      OtherTy = VectorType::get(VecTy->getElementType(), NumElements);
  } else if (IntTy && !IsWholeAlloca) {
    OtherTy = SubIntTy;
  } else {
    OtherTy = NewAllocaTy;
  }
  OtherPtrTy = OtherTy->getPointerTo(OtherAS);

  Value *SrcPtr = getAdjustedPtr(IRB, DL, OtherPtr, OtherOffset, OtherPtrTy,
24
←
Calling 'getAdjustedPtr'→
57
←
Returning from 'getAdjustedPtr'→
                                 OtherPtr->getName() + ".");
  unsigned SrcAlign = OtherAlign;
  Value *DstPtr = &NewAI;
  unsigned DstAlign = SliceAlign;
  if (!IsDest57.1
'IsDest' is false
1
'IsDest' is false
1
'IsDest' is false
) {
58
←
Taking true branch→
    std::swap(SrcPtr, DstPtr);
    std::swap(SrcAlign, DstAlign);
  }

  Value *Src;
  if (VecTy && !IsWholeAlloca && !IsDest) {
59
←
Assuming field 'VecTy' is null→
    Src = IRB.CreateAlignedLoad(NewAI.getAllocatedType(), &NewAI,
                                NewAI.getAlignment(), "load");
    Src = extractVector(IRB, Src, BeginIndex, EndIndex, "vec");
  } else if (IntTy && !IsWholeAlloca60.1
'IsWholeAlloca' is false
1
'IsWholeAlloca' is false
1
'IsWholeAlloca' is false
 && !IsDest60.2
'IsDest' is false
2
'IsDest' is false
2
'IsDest' is false
) {
60
←
Assuming field 'IntTy' is non-null→
61
←
Taking true branch→
    Src = IRB.CreateAlignedLoad(NewAI.getAllocatedType(), &NewAI,
                                NewAI.getAlignment(), "load");
    Src = convertValue(DL, IRB, Src, IntTy);
    uint64_t Offset = NewBeginOffset - NewAllocaBeginOffset;
    Src = extractInteger(DL, IRB, Src, SubIntTy, Offset, "extract");
62
←
Passing null pointer value via 4th parameter 'Ty'→
63
←
Calling 'extractInteger'→
  } else {
    LoadInst *Load = IRB.CreateAlignedLoad(OtherTy, SrcPtr, SrcAlign,
                                           II.isVolatile(), "copyload");
    if (AATags)
      Load->setAAMetadata(AATags);
    Src = Load;
  }

  if (VecTy && !IsWholeAlloca && IsDest) {
    Value *Old = IRB.CreateAlignedLoad(NewAI.getAllocatedType(), &NewAI,
                                       NewAI.getAlignment(), "oldload");
    Src = insertVector(IRB, Old, Src, BeginIndex, "vec");
  } else if (IntTy && !IsWholeAlloca && IsDest) {
    Value *Old = IRB.CreateAlignedLoad(NewAI.getAllocatedType(), &NewAI,
                                       NewAI.getAlignment(), "oldload");
    Old = convertValue(DL, IRB, Old, IntTy);
    uint64_t Offset = NewBeginOffset - NewAllocaBeginOffset;
    Src = insertInteger(DL, IRB, Old, Src, Offset, "insert");
    Src = convertValue(DL, IRB, Src, NewAllocaTy);
  }

  StoreInst *Store = cast<StoreInst>(
      IRB.CreateAlignedStore(Src, DstPtr, DstAlign, II.isVolatile()));
  if (AATags)
    Store->setAAMetadata(AATags);
  LLVM_DEBUG(dbgs() << "          to: " << *Store << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "          to: " << *Store <<
 "\n"; } } while (false);
  return !II.isVolatile();
}

bool visitIntrinsicInst(IntrinsicInst &II) {
  assert(II.isLifetimeStartOrEnd())((II.isLifetimeStartOrEnd()) ? static_cast<void> (0) : __assert_fail
 ("II.isLifetimeStartOrEnd()", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3071, __PRETTY_FUNCTION__));
  LLVM_DEBUG(dbgs() << "    original: " << II << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    original: " << II <<
 "\n"; } } while (false);
  assert(II.getArgOperand(1) == OldPtr)((II.getArgOperand(1) == OldPtr) ? static_cast<void> (0
) : __assert_fail ("II.getArgOperand(1) == OldPtr", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3073, __PRETTY_FUNCTION__));

  // Record this instruction for deletion.
  Pass.DeadInsts.insert(&II);

  // Lifetime intrinsics are only promotable if they cover the whole alloca.
  // Therefore, we drop lifetime intrinsics which don't cover the whole
  // alloca.
  // (In theory, intrinsics which partially cover an alloca could be
  // promoted, but PromoteMemToReg doesn't handle that case.)
  // FIXME: Check whether the alloca is promotable before dropping the
  // lifetime intrinsics?
  if (NewBeginOffset != NewAllocaBeginOffset ||
      NewEndOffset != NewAllocaEndOffset)
    return true;

  ConstantInt *Size =
      ConstantInt::get(cast<IntegerType>(II.getArgOperand(0)->getType()),
                       NewEndOffset - NewBeginOffset);
  // Lifetime intrinsics always expect an i8* so directly get such a pointer
  // for the new alloca slice.
  Type *PointerTy = IRB.getInt8PtrTy(OldPtr->getType()->getPointerAddressSpace());
  Value *Ptr = getNewAllocaSlicePtr(IRB, PointerTy);
  Value *New;
  if (II.getIntrinsicID() == Intrinsic::lifetime_start)
    New = IRB.CreateLifetimeStart(Ptr, Size);
  else
    New = IRB.CreateLifetimeEnd(Ptr, Size);

  (void)New;
  LLVM_DEBUG(dbgs() << "          to: " << *New << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "          to: " << *New <<
 "\n"; } } while (false);

  return true;
}

void fixLoadStoreAlign(Instruction &Root) {
  // This algorithm implements the same visitor loop as
  // hasUnsafePHIOrSelectUse, and fixes the alignment of each load
  // or store found.
  SmallPtrSet<Instruction *, 4> Visited;
  SmallVector<Instruction *, 4> Uses;
  Visited.insert(&Root);
  Uses.push_back(&Root);
  do {
    Instruction *I = Uses.pop_back_val();

    if (LoadInst *LI = dyn_cast<LoadInst>(I)) {
      unsigned LoadAlign = LI->getAlignment();
      if (!LoadAlign)
        LoadAlign = DL.getABITypeAlignment(LI->getType());
      LI->setAlignment(MaybeAlign(std::min(LoadAlign, getSliceAlign())));
      continue;
    }
    if (StoreInst *SI = dyn_cast<StoreInst>(I)) {
      unsigned StoreAlign = SI->getAlignment();
      if (!StoreAlign) {
        Value *Op = SI->getOperand(0);
        StoreAlign = DL.getABITypeAlignment(Op->getType());
      }
      SI->setAlignment(MaybeAlign(std::min(StoreAlign, getSliceAlign())));
      continue;
    }

    assert(isa<BitCastInst>(I) || isa<AddrSpaceCastInst>(I) ||((isa<BitCastInst>(I) || isa<AddrSpaceCastInst>(I
) || isa<PHINode>(I) || isa<SelectInst>(I) || isa
<GetElementPtrInst>(I)) ? static_cast<void> (0) :
 __assert_fail ("isa<BitCastInst>(I) || isa<AddrSpaceCastInst>(I) || isa<PHINode>(I) || isa<SelectInst>(I) || isa<GetElementPtrInst>(I)"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3138, __PRETTY_FUNCTION__))
           isa<PHINode>(I) || isa<SelectInst>(I) ||((isa<BitCastInst>(I) || isa<AddrSpaceCastInst>(I
) || isa<PHINode>(I) || isa<SelectInst>(I) || isa
<GetElementPtrInst>(I)) ? static_cast<void> (0) :
 __assert_fail ("isa<BitCastInst>(I) || isa<AddrSpaceCastInst>(I) || isa<PHINode>(I) || isa<SelectInst>(I) || isa<GetElementPtrInst>(I)"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3138, __PRETTY_FUNCTION__))
           isa<GetElementPtrInst>(I))((isa<BitCastInst>(I) || isa<AddrSpaceCastInst>(I
) || isa<PHINode>(I) || isa<SelectInst>(I) || isa
<GetElementPtrInst>(I)) ? static_cast<void> (0) :
 __assert_fail ("isa<BitCastInst>(I) || isa<AddrSpaceCastInst>(I) || isa<PHINode>(I) || isa<SelectInst>(I) || isa<GetElementPtrInst>(I)"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3138, __PRETTY_FUNCTION__));
    for (User *U : I->users())
      if (Visited.insert(cast<Instruction>(U)).second)
        Uses.push_back(cast<Instruction>(U));
  } while (!Uses.empty());
}

bool visitPHINode(PHINode &PN) {
  LLVM_DEBUG(dbgs() << "    original: " << PN << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    original: " << PN <<
 "\n"; } } while (false);
  assert(BeginOffset >= NewAllocaBeginOffset && "PHIs are unsplittable")((BeginOffset >= NewAllocaBeginOffset && "PHIs are unsplittable"
) ? static_cast<void> (0) : __assert_fail ("BeginOffset >= NewAllocaBeginOffset && \"PHIs are unsplittable\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3147, __PRETTY_FUNCTION__));
  assert(EndOffset <= NewAllocaEndOffset && "PHIs are unsplittable")((EndOffset <= NewAllocaEndOffset && "PHIs are unsplittable"
) ? static_cast<void> (0) : __assert_fail ("EndOffset <= NewAllocaEndOffset && \"PHIs are unsplittable\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3148, __PRETTY_FUNCTION__));

  // We would like to compute a new pointer in only one place, but have it be
  // as local as possible to the PHI. To do that, we re-use the location of
  // the old pointer, which necessarily must be in the right position to
  // dominate the PHI.
  IRBuilderTy PtrBuilder(IRB);
  if (isa<PHINode>(OldPtr))
    PtrBuilder.SetInsertPoint(&*OldPtr->getParent()->getFirstInsertionPt());
  else
    PtrBuilder.SetInsertPoint(OldPtr);
  PtrBuilder.SetCurrentDebugLocation(OldPtr->getDebugLoc());

  Value *NewPtr = getNewAllocaSlicePtr(PtrBuilder, OldPtr->getType());
  // Replace the operands which were using the old pointer.
  std::replace(PN.op_begin(), PN.op_end(), cast<Value>(OldPtr), NewPtr);

  LLVM_DEBUG(dbgs() << "          to: " << PN << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "          to: " << PN <<
 "\n"; } } while (false);
  deleteIfTriviallyDead(OldPtr);

  // Fix the alignment of any loads or stores using this PHI node.
  fixLoadStoreAlign(PN);

  // PHIs can't be promoted on their own, but often can be speculated. We
  // check the speculation outside of the rewriter so that we see the
  // fully-rewritten alloca.
  PHIUsers.insert(&PN);
  return true;
}

bool visitSelectInst(SelectInst &SI) {
  LLVM_DEBUG(dbgs() << "    original: " << SI << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    original: " << SI <<
 "\n"; } } while (false);
  assert((SI.getTrueValue() == OldPtr || SI.getFalseValue() == OldPtr) &&(((SI.getTrueValue() == OldPtr || SI.getFalseValue() == OldPtr
) && "Pointer isn't an operand!") ? static_cast<void
> (0) : __assert_fail ("(SI.getTrueValue() == OldPtr || SI.getFalseValue() == OldPtr) && \"Pointer isn't an operand!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3181, __PRETTY_FUNCTION__))
         "Pointer isn't an operand!")(((SI.getTrueValue() == OldPtr || SI.getFalseValue() == OldPtr
) && "Pointer isn't an operand!") ? static_cast<void
> (0) : __assert_fail ("(SI.getTrueValue() == OldPtr || SI.getFalseValue() == OldPtr) && \"Pointer isn't an operand!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3181, __PRETTY_FUNCTION__));
  assert(BeginOffset >= NewAllocaBeginOffset && "Selects are unsplittable")((BeginOffset >= NewAllocaBeginOffset && "Selects are unsplittable"
) ? static_cast<void> (0) : __assert_fail ("BeginOffset >= NewAllocaBeginOffset && \"Selects are unsplittable\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3182, __PRETTY_FUNCTION__));
  assert(EndOffset <= NewAllocaEndOffset && "Selects are unsplittable")((EndOffset <= NewAllocaEndOffset && "Selects are unsplittable"
) ? static_cast<void> (0) : __assert_fail ("EndOffset <= NewAllocaEndOffset && \"Selects are unsplittable\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3183, __PRETTY_FUNCTION__));

  Value *NewPtr = getNewAllocaSlicePtr(IRB, OldPtr->getType());
  // Replace the operands which were using the old pointer.
  if (SI.getOperand(1) == OldPtr)
    SI.setOperand(1, NewPtr);
  if (SI.getOperand(2) == OldPtr)
    SI.setOperand(2, NewPtr);

  LLVM_DEBUG(dbgs() << "          to: " << SI << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "          to: " << SI <<
 "\n"; } } while (false);
  deleteIfTriviallyDead(OldPtr);

  // Fix the alignment of any loads or stores using this select.
  fixLoadStoreAlign(SI);

  // Selects can't be promoted on their own, but often can be speculated. We
  // check the speculation outside of the rewriter so that we see the
  // fully-rewritten alloca.
  SelectUsers.insert(&SI);
  return true;
}
3204};

3206namespace {

3208/// Visitor to rewrite aggregate loads and stores as scalar.
3209///
3210/// This pass aggressively rewrites all aggregate loads and stores on
3211/// a particular pointer (or any pointer derived from it which we can identify)
3212/// with scalar loads and stores.
3213class AggLoadStoreRewriter : public InstVisitor<AggLoadStoreRewriter, bool> {
// Befriend the base class so it can delegate to private visit methods.
friend class InstVisitor<AggLoadStoreRewriter, bool>;

/// Queue of pointer uses to analyze and potentially rewrite.
SmallVector<Use *, 8> Queue;

/// Set to prevent us from cycling with phi nodes and loops.
SmallPtrSet<User *, 8> Visited;

/// The current pointer use being rewritten. This is used to dig up the used
/// value (as opposed to the user).
Use *U;

/// Used to calculate offsets, and hence alignment, of subobjects.
const DataLayout &DL;

3230public:
AggLoadStoreRewriter(const DataLayout &DL) : DL(DL) {}

/// Rewrite loads and stores through a pointer and all pointers derived from
/// it.
bool rewrite(Instruction &I) {
  LLVM_DEBUG(dbgs() << "  Rewriting FCA loads and stores...\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "  Rewriting FCA loads and stores...\n"
; } } while (false);
  enqueueUsers(I);
  bool Changed = false;
  while (!Queue.empty()) {
    U = Queue.pop_back_val();
    Changed |= visit(cast<Instruction>(U->getUser()));
  }
  return Changed;
}

3246private:
/// Enqueue all the users of the given instruction for further processing.
/// This uses a set to de-duplicate users.
void enqueueUsers(Instruction &I) {
  for (Use &U : I.uses())
    if (Visited.insert(U.getUser()).second)
      Queue.push_back(&U);
}

// Conservative default is to not rewrite anything.
bool visitInstruction(Instruction &I) { return false; }

/// Generic recursive split emission class.
template <typename Derived> class OpSplitter {
protected:
  /// The builder used to form new instructions.
  IRBuilderTy IRB;

  /// The indices which to be used with insert- or extractvalue to select the
  /// appropriate value within the aggregate.
  SmallVector<unsigned, 4> Indices;

  /// The indices to a GEP instruction which will move Ptr to the correct slot
  /// within the aggregate.
  SmallVector<Value *, 4> GEPIndices;

  /// The base pointer of the original op, used as a base for GEPing the
  /// split operations.
  Value *Ptr;

  /// The base pointee type being GEPed into.
  Type *BaseTy;

  /// Known alignment of the base pointer.
  unsigned BaseAlign;

  /// To calculate offset of each component so we can correctly deduce
  /// alignments.
  const DataLayout &DL;

  /// Initialize the splitter with an insertion point, Ptr and start with a
  /// single zero GEP index.
  OpSplitter(Instruction *InsertionPoint, Value *Ptr, Type *BaseTy,
             unsigned BaseAlign, const DataLayout &DL)
      : IRB(InsertionPoint), GEPIndices(1, IRB.getInt32(0)), Ptr(Ptr),
        BaseTy(BaseTy), BaseAlign(BaseAlign), DL(DL) {}

public:
  /// Generic recursive split emission routine.
  ///
  /// This method recursively splits an aggregate op (load or store) into
  /// scalar or vector ops. It splits recursively until it hits a single value
  /// and emits that single value operation via the template argument.
  ///
  /// The logic of this routine relies on GEPs and insertvalue and
  /// extractvalue all operating with the same fundamental index list, merely
  /// formatted differently (GEPs need actual values).
  ///
  /// \param Ty  The type being split recursively into smaller ops.
  /// \param Agg The aggregate value being built up or stored, depending on
  /// whether this is splitting a load or a store respectively.
  void emitSplitOps(Type *Ty, Value *&Agg, const Twine &Name) {
    if (Ty->isSingleValueType()) {
      unsigned Offset = DL.getIndexedOffsetInType(BaseTy, GEPIndices);
      return static_cast<Derived *>(this)->emitFunc(
          Ty, Agg, MinAlign(BaseAlign, Offset), Name);
    }

    if (ArrayType *ATy = dyn_cast<ArrayType>(Ty)) {
      unsigned OldSize = Indices.size();
      (void)OldSize;
      for (unsigned Idx = 0, Size = ATy->getNumElements(); Idx != Size;
           ++Idx) {
        assert(Indices.size() == OldSize && "Did not return to the old size")((Indices.size() == OldSize && "Did not return to the old size"
) ? static_cast<void> (0) : __assert_fail ("Indices.size() == OldSize && \"Did not return to the old size\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3319, __PRETTY_FUNCTION__));
        Indices.push_back(Idx);
        GEPIndices.push_back(IRB.getInt32(Idx));
        emitSplitOps(ATy->getElementType(), Agg, Name + "." + Twine(Idx));
        GEPIndices.pop_back();
        Indices.pop_back();
      }
      return;
    }

    if (StructType *STy = dyn_cast<StructType>(Ty)) {
      unsigned OldSize = Indices.size();
      (void)OldSize;
      for (unsigned Idx = 0, Size = STy->getNumElements(); Idx != Size;
           ++Idx) {
        assert(Indices.size() == OldSize && "Did not return to the old size")((Indices.size() == OldSize && "Did not return to the old size"
) ? static_cast<void> (0) : __assert_fail ("Indices.size() == OldSize && \"Did not return to the old size\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3334, __PRETTY_FUNCTION__));
        Indices.push_back(Idx);
        GEPIndices.push_back(IRB.getInt32(Idx));
        emitSplitOps(STy->getElementType(Idx), Agg, Name + "." + Twine(Idx));
        GEPIndices.pop_back();
        Indices.pop_back();
      }
      return;
    }

    llvm_unreachable("Only arrays and structs are aggregate loadable types")::llvm::llvm_unreachable_internal("Only arrays and structs are aggregate loadable types"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3344);
  }
};

struct LoadOpSplitter : public OpSplitter<LoadOpSplitter> {
  AAMDNodes AATags;

  LoadOpSplitter(Instruction *InsertionPoint, Value *Ptr, Type *BaseTy,
                 AAMDNodes AATags, unsigned BaseAlign, const DataLayout &DL)
      : OpSplitter<LoadOpSplitter>(InsertionPoint, Ptr, BaseTy, BaseAlign,
                                   DL), AATags(AATags) {}

  /// Emit a leaf load of a single value. This is called at the leaves of the
  /// recursive emission to actually load values.
  void emitFunc(Type *Ty, Value *&Agg, unsigned Align, const Twine &Name) {
    assert(Ty->isSingleValueType())((Ty->isSingleValueType()) ? static_cast<void> (0) :
 __assert_fail ("Ty->isSingleValueType()", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3359, __PRETTY_FUNCTION__));
    // Load the single value and insert it using the indices.
    Value *GEP =
        IRB.CreateInBoundsGEP(BaseTy, Ptr, GEPIndices, Name + ".gep");
    LoadInst *Load = IRB.CreateAlignedLoad(Ty, GEP, Align, Name + ".load");
    if (AATags)
      Load->setAAMetadata(AATags);
    Agg = IRB.CreateInsertValue(Agg, Load, Indices, Name + ".insert");
    LLVM_DEBUG(dbgs() << "          to: " << *Load << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "          to: " << *Load <<
 "\n"; } } while (false);
  }
};

bool visitLoadInst(LoadInst &LI) {
  assert(LI.getPointerOperand() == *U)((LI.getPointerOperand() == *U) ? static_cast<void> (0)
 : __assert_fail ("LI.getPointerOperand() == *U", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3372, __PRETTY_FUNCTION__));
  if (!LI.isSimple() || LI.getType()->isSingleValueType())
    return false;

  // We have an aggregate being loaded, split it apart.
  LLVM_DEBUG(dbgs() << "    original: " << LI << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    original: " << LI <<
 "\n"; } } while (false);
  AAMDNodes AATags;
  LI.getAAMetadata(AATags);
  LoadOpSplitter Splitter(&LI, *U, LI.getType(), AATags,
                          getAdjustedAlignment(&LI, 0, DL), DL);
  Value *V = UndefValue::get(LI.getType());
  Splitter.emitSplitOps(LI.getType(), V, LI.getName() + ".fca");
  LI.replaceAllUsesWith(V);
  LI.eraseFromParent();
  return true;
}

struct StoreOpSplitter : public OpSplitter<StoreOpSplitter> {
  StoreOpSplitter(Instruction *InsertionPoint, Value *Ptr, Type *BaseTy,
                  AAMDNodes AATags, unsigned BaseAlign, const DataLayout &DL)
      : OpSplitter<StoreOpSplitter>(InsertionPoint, Ptr, BaseTy, BaseAlign,
                                    DL),
        AATags(AATags) {}
  AAMDNodes AATags;
  /// Emit a leaf store of a single value. This is called at the leaves of the
  /// recursive emission to actually produce stores.
  void emitFunc(Type *Ty, Value *&Agg, unsigned Align, const Twine &Name) {
    assert(Ty->isSingleValueType())((Ty->isSingleValueType()) ? static_cast<void> (0) :
 __assert_fail ("Ty->isSingleValueType()", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3399, __PRETTY_FUNCTION__));
    // Extract the single value and store it using the indices.
    //
    // The gep and extractvalue values are factored out of the CreateStore
    // call to make the output independent of the argument evaluation order.
    Value *ExtractValue =
        IRB.CreateExtractValue(Agg, Indices, Name + ".extract");
    Value *InBoundsGEP =
        IRB.CreateInBoundsGEP(BaseTy, Ptr, GEPIndices, Name + ".gep");
    StoreInst *Store =
        IRB.CreateAlignedStore(ExtractValue, InBoundsGEP, Align);
    if (AATags)
      Store->setAAMetadata(AATags);
    LLVM_DEBUG(dbgs() << "          to: " << *Store << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "          to: " << *Store <<
 "\n"; } } while (false);
  }
};

bool visitStoreInst(StoreInst &SI) {
  if (!SI.isSimple() || SI.getPointerOperand() != *U)
    return false;
  Value *V = SI.getValueOperand();
  if (V->getType()->isSingleValueType())
    return false;

  // We have an aggregate being stored, split it apart.
  LLVM_DEBUG(dbgs() << "    original: " << SI << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    original: " << SI <<
 "\n"; } } while (false);
  AAMDNodes AATags;
  SI.getAAMetadata(AATags);
  StoreOpSplitter Splitter(&SI, *U, V->getType(), AATags,
                           getAdjustedAlignment(&SI, 0, DL), DL);
  Splitter.emitSplitOps(V->getType(), V, V->getName() + ".fca");
  SI.eraseFromParent();
  return true;
}

bool visitBitCastInst(BitCastInst &BC) {
  enqueueUsers(BC);
  return false;
}

bool visitAddrSpaceCastInst(AddrSpaceCastInst &ASC) {
  enqueueUsers(ASC);
  return false;
}

bool visitGetElementPtrInst(GetElementPtrInst &GEPI) {
  enqueueUsers(GEPI);
  return false;
}

bool visitPHINode(PHINode &PN) {
  enqueueUsers(PN);
  return false;
}

bool visitSelectInst(SelectInst &SI) {
  enqueueUsers(SI);
  return false;
}
3458};

3460} // end anonymous namespace

3462/// Strip aggregate type wrapping.
3463///
3464/// This removes no-op aggregate types wrapping an underlying type. It will
3465/// strip as many layers of types as it can without changing either the type
3466/// size or the allocated size.
3467static Type *stripAggregateTypeWrapping(const DataLayout &DL, Type *Ty) {
if (Ty->isSingleValueType())
  return Ty;

uint64_t AllocSize = DL.getTypeAllocSize(Ty);
uint64_t TypeSize = DL.getTypeSizeInBits(Ty);

Type *InnerTy;
if (ArrayType *ArrTy = dyn_cast<ArrayType>(Ty)) {
  InnerTy = ArrTy->getElementType();
} else if (StructType *STy = dyn_cast<StructType>(Ty)) {
  const StructLayout *SL = DL.getStructLayout(STy);
  unsigned Index = SL->getElementContainingOffset(0);
  InnerTy = STy->getElementType(Index);
} else {
  return Ty;
}

if (AllocSize > DL.getTypeAllocSize(InnerTy) ||
    TypeSize > DL.getTypeSizeInBits(InnerTy))
  return Ty;

return stripAggregateTypeWrapping(DL, InnerTy);
3490}

3492/// Try to find a partition of the aggregate type passed in for a given
3493/// offset and size.
3494///
3495/// This recurses through the aggregate type and tries to compute a subtype
3496/// based on the offset and size. When the offset and size span a sub-section
3497/// of an array, it will even compute a new array type for that sub-section,
3498/// and the same for structs.
3499///
3500/// Note that this routine is very strict and tries to find a partition of the
3501/// type which produces the *exact* right offset and size. It is not forgiving
3502/// when the size or offset cause either end of type-based partition to be off.
3503/// Also, this is a best-effort routine. It is reasonable to give up and not
3504/// return a type if necessary.
3505static Type *getTypePartition(const DataLayout &DL, Type *Ty, uint64_t Offset,
                            uint64_t Size) {
if (Offset == 0 && DL.getTypeAllocSize(Ty) == Size)
  return stripAggregateTypeWrapping(DL, Ty);
if (Offset > DL.getTypeAllocSize(Ty) ||
    (DL.getTypeAllocSize(Ty) - Offset) < Size)
  return nullptr;

if (SequentialType *SeqTy = dyn_cast<SequentialType>(Ty)) {
  Type *ElementTy = SeqTy->getElementType();
  uint64_t ElementSize = DL.getTypeAllocSize(ElementTy);
  uint64_t NumSkippedElements = Offset / ElementSize;
  if (NumSkippedElements >= SeqTy->getNumElements())
    return nullptr;
  Offset -= NumSkippedElements * ElementSize;

  // First check if we need to recurse.
  if (Offset > 0 || Size < ElementSize) {
    // Bail if the partition ends in a different array element.
    if ((Offset + Size) > ElementSize)
      return nullptr;
    // Recurse through the element type trying to peel off offset bytes.
    return getTypePartition(DL, ElementTy, Offset, Size);
  }
  assert(Offset == 0)((Offset == 0) ? static_cast<void> (0) : __assert_fail (
"Offset == 0", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3529, __PRETTY_FUNCTION__));

  if (Size == ElementSize)
    return stripAggregateTypeWrapping(DL, ElementTy);
  assert(Size > ElementSize)((Size > ElementSize) ? static_cast<void> (0) : __assert_fail
 ("Size > ElementSize", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3533, __PRETTY_FUNCTION__));
  uint64_t NumElements = Size / ElementSize;
  if (NumElements * ElementSize != Size)
    return nullptr;
  return ArrayType::get(ElementTy, NumElements);
}

StructType *STy = dyn_cast<StructType>(Ty);
if (!STy)
  return nullptr;

const StructLayout *SL = DL.getStructLayout(STy);
if (Offset >= SL->getSizeInBytes())
  return nullptr;
uint64_t EndOffset = Offset + Size;
if (EndOffset > SL->getSizeInBytes())
  return nullptr;

unsigned Index = SL->getElementContainingOffset(Offset);
Offset -= SL->getElementOffset(Index);

Type *ElementTy = STy->getElementType(Index);
uint64_t ElementSize = DL.getTypeAllocSize(ElementTy);
if (Offset >= ElementSize)
  return nullptr; // The offset points into alignment padding.

// See if any partition must be contained by the element.
if (Offset > 0 || Size < ElementSize) {
  if ((Offset + Size) > ElementSize)
    return nullptr;
  return getTypePartition(DL, ElementTy, Offset, Size);
}
assert(Offset == 0)((Offset == 0) ? static_cast<void> (0) : __assert_fail (
"Offset == 0", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3565, __PRETTY_FUNCTION__));

if (Size == ElementSize)
  return stripAggregateTypeWrapping(DL, ElementTy);

StructType::element_iterator EI = STy->element_begin() + Index,
                             EE = STy->element_end();
if (EndOffset < SL->getSizeInBytes()) {
  unsigned EndIndex = SL->getElementContainingOffset(EndOffset);
  if (Index == EndIndex)
    return nullptr; // Within a single element and its padding.

  // Don't try to form "natural" types if the elements don't line up with the
  // expected size.
  // FIXME: We could potentially recurse down through the last element in the
  // sub-struct to find a natural end point.
  if (SL->getElementOffset(EndIndex) != EndOffset)
    return nullptr;

  assert(Index < EndIndex)((Index < EndIndex) ? static_cast<void> (0) : __assert_fail
 ("Index < EndIndex", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3584, __PRETTY_FUNCTION__));
  EE = STy->element_begin() + EndIndex;
}

// Try to build up a sub-structure.
StructType *SubTy =
    StructType::get(STy->getContext(), makeArrayRef(EI, EE), STy->isPacked());
const StructLayout *SubSL = DL.getStructLayout(SubTy);
if (Size != SubSL->getSizeInBytes())
  return nullptr; // The sub-struct doesn't have quite the size needed.

return SubTy;
3596}

3598/// Pre-split loads and stores to simplify rewriting.
3599///
3600/// We want to break up the splittable load+store pairs as much as
3601/// possible. This is important to do as a preprocessing step, as once we
3602/// start rewriting the accesses to partitions of the alloca we lose the
3603/// necessary information to correctly split apart paired loads and stores
3604/// which both point into this alloca. The case to consider is something like
3605/// the following:
3606///
3607///   %a = alloca [12 x i8]
3608///   %gep1 = getelementptr [12 x i8]* %a, i32 0, i32 0
3609///   %gep2 = getelementptr [12 x i8]* %a, i32 0, i32 4
3610///   %gep3 = getelementptr [12 x i8]* %a, i32 0, i32 8
3611///   %iptr1 = bitcast i8* %gep1 to i64*
3612///   %iptr2 = bitcast i8* %gep2 to i64*
3613///   %fptr1 = bitcast i8* %gep1 to float*
3614///   %fptr2 = bitcast i8* %gep2 to float*
3615///   %fptr3 = bitcast i8* %gep3 to float*
3616///   store float 0.0, float* %fptr1
3617///   store float 1.0, float* %fptr2
3618///   %v = load i64* %iptr1
3619///   store i64 %v, i64* %iptr2
3620///   %f1 = load float* %fptr2
3621///   %f2 = load float* %fptr3
3622///
3623/// Here we want to form 3 partitions of the alloca, each 4 bytes large, and
3624/// promote everything so we recover the 2 SSA values that should have been
3625/// there all along.
3626///
3627/// \returns true if any changes are made.
3628bool SROA::presplitLoadsAndStores(AllocaInst &AI, AllocaSlices &AS) {
LLVM_DEBUG(dbgs() << "Pre-splitting loads and stores\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "Pre-splitting loads and stores\n"
; } } while (false);

// Track the loads and stores which are candidates for pre-splitting here, in
// the order they first appear during the partition scan. These give stable
// iteration order and a basis for tracking which loads and stores we
// actually split.
SmallVector<LoadInst *, 4> Loads;
SmallVector<StoreInst *, 4> Stores;

// We need to accumulate the splits required of each load or store where we
// can find them via a direct lookup. This is important to cross-check loads
// and stores against each other. We also track the slice so that we can kill
// all the slices that end up split.
struct SplitOffsets {
  Slice *S;
  std::vector<uint64_t> Splits;
};
SmallDenseMap<Instruction *, SplitOffsets, 8> SplitOffsetsMap;

// Track loads out of this alloca which cannot, for any reason, be pre-split.
// This is important as we also cannot pre-split stores of those loads!
// FIXME: This is all pretty gross. It means that we can be more aggressive
// in pre-splitting when the load feeding the store happens to come from
// a separate alloca. Put another way, the effectiveness of SROA would be
// decreased by a frontend which just concatenated all of its local allocas
// into one big flat alloca. But defeating such patterns is exactly the job
// SROA is tasked with! Sadly, to not have this discrepancy we would have
// change store pre-splitting to actually force pre-splitting of the load
// that feeds it *and all stores*. That makes pre-splitting much harder, but
// maybe it would make it more principled?
SmallPtrSet<LoadInst *, 8> UnsplittableLoads;

LLVM_DEBUG(dbgs() << "  Searching for candidate loads and stores\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "  Searching for candidate loads and stores\n"
; } } while (false);
for (auto &P : AS.partitions()) {
  for (Slice &S : P) {
    Instruction *I = cast<Instruction>(S.getUse()->getUser());
    if (!S.isSplittable() || S.endOffset() <= P.endOffset()) {
      // If this is a load we have to track that it can't participate in any
      // pre-splitting. If this is a store of a load we have to track that
      // that load also can't participate in any pre-splitting.
      if (auto *LI = dyn_cast<LoadInst>(I))
        UnsplittableLoads.insert(LI);
      else if (auto *SI = dyn_cast<StoreInst>(I))
        if (auto *LI = dyn_cast<LoadInst>(SI->getValueOperand()))
          UnsplittableLoads.insert(LI);
      continue;
    }
    assert(P.endOffset() > S.beginOffset() &&((P.endOffset() > S.beginOffset() && "Empty or backwards partition!"
) ? static_cast<void> (0) : __assert_fail ("P.endOffset() > S.beginOffset() && \"Empty or backwards partition!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3677, __PRETTY_FUNCTION__))
           "Empty or backwards partition!")((P.endOffset() > S.beginOffset() && "Empty or backwards partition!"
) ? static_cast<void> (0) : __assert_fail ("P.endOffset() > S.beginOffset() && \"Empty or backwards partition!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3677, __PRETTY_FUNCTION__));

    // Determine if this is a pre-splittable slice.
    if (auto *LI = dyn_cast<LoadInst>(I)) {
      assert(!LI->isVolatile() && "Cannot split volatile loads!")((!LI->isVolatile() && "Cannot split volatile loads!"
) ? static_cast<void> (0) : __assert_fail ("!LI->isVolatile() && \"Cannot split volatile loads!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3681, __PRETTY_FUNCTION__));

      // The load must be used exclusively to store into other pointers for
      // us to be able to arbitrarily pre-split it. The stores must also be
      // simple to avoid changing semantics.
      auto IsLoadSimplyStored = [](LoadInst *LI) {
        for (User *LU : LI->users()) {
          auto *SI = dyn_cast<StoreInst>(LU);
          if (!SI || !SI->isSimple())
            return false;
        }
        return true;
      };
      if (!IsLoadSimplyStored(LI)) {
        UnsplittableLoads.insert(LI);
        continue;
      }

      Loads.push_back(LI);
    } else if (auto *SI = dyn_cast<StoreInst>(I)) {
      if (S.getUse() != &SI->getOperandUse(SI->getPointerOperandIndex()))
        // Skip stores *of* pointers. FIXME: This shouldn't even be possible!
        continue;
      auto *StoredLoad = dyn_cast<LoadInst>(SI->getValueOperand());
      if (!StoredLoad || !StoredLoad->isSimple())
        continue;
      assert(!SI->isVolatile() && "Cannot split volatile stores!")((!SI->isVolatile() && "Cannot split volatile stores!"
) ? static_cast<void> (0) : __assert_fail ("!SI->isVolatile() && \"Cannot split volatile stores!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3707, __PRETTY_FUNCTION__));

      Stores.push_back(SI);
    } else {
      // Other uses cannot be pre-split.
      continue;
    }

    // Record the initial split.
    LLVM_DEBUG(dbgs() << "    Candidate: " << *I << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    Candidate: " << *I <<
 "\n"; } } while (false);
    auto &Offsets = SplitOffsetsMap[I];
    assert(Offsets.Splits.empty() &&((Offsets.Splits.empty() && "Should not have splits the first time we see an instruction!"
) ? static_cast<void> (0) : __assert_fail ("Offsets.Splits.empty() && \"Should not have splits the first time we see an instruction!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3719, __PRETTY_FUNCTION__))
           "Should not have splits the first time we see an instruction!")((Offsets.Splits.empty() && "Should not have splits the first time we see an instruction!"
) ? static_cast<void> (0) : __assert_fail ("Offsets.Splits.empty() && \"Should not have splits the first time we see an instruction!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3719, __PRETTY_FUNCTION__));
    Offsets.S = &S;
    Offsets.Splits.push_back(P.endOffset() - S.beginOffset());
  }

  // Now scan the already split slices, and add a split for any of them which
  // we're going to pre-split.
  for (Slice *S : P.splitSliceTails()) {
    auto SplitOffsetsMapI =
        SplitOffsetsMap.find(cast<Instruction>(S->getUse()->getUser()));
    if (SplitOffsetsMapI == SplitOffsetsMap.end())
      continue;
    auto &Offsets = SplitOffsetsMapI->second;

    assert(Offsets.S == S && "Found a mismatched slice!")((Offsets.S == S && "Found a mismatched slice!") ? static_cast
<void> (0) : __assert_fail ("Offsets.S == S && \"Found a mismatched slice!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3733, __PRETTY_FUNCTION__));
    assert(!Offsets.Splits.empty() &&((!Offsets.Splits.empty() && "Cannot have an empty set of splits on the second partition!"
) ? static_cast<void> (0) : __assert_fail ("!Offsets.Splits.empty() && \"Cannot have an empty set of splits on the second partition!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3735, __PRETTY_FUNCTION__))
           "Cannot have an empty set of splits on the second partition!")((!Offsets.Splits.empty() && "Cannot have an empty set of splits on the second partition!"
) ? static_cast<void> (0) : __assert_fail ("!Offsets.Splits.empty() && \"Cannot have an empty set of splits on the second partition!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3735, __PRETTY_FUNCTION__));
    assert(Offsets.Splits.back() ==((Offsets.Splits.back() == P.beginOffset() - Offsets.S->beginOffset
() && "Previous split does not end where this one begins!"
) ? static_cast<void> (0) : __assert_fail ("Offsets.Splits.back() == P.beginOffset() - Offsets.S->beginOffset() && \"Previous split does not end where this one begins!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3738, __PRETTY_FUNCTION__))
               P.beginOffset() - Offsets.S->beginOffset() &&((Offsets.Splits.back() == P.beginOffset() - Offsets.S->beginOffset
() && "Previous split does not end where this one begins!"
) ? static_cast<void> (0) : __assert_fail ("Offsets.Splits.back() == P.beginOffset() - Offsets.S->beginOffset() && \"Previous split does not end where this one begins!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3738, __PRETTY_FUNCTION__))
           "Previous split does not end where this one begins!")((Offsets.Splits.back() == P.beginOffset() - Offsets.S->beginOffset
() && "Previous split does not end where this one begins!"
) ? static_cast<void> (0) : __assert_fail ("Offsets.Splits.back() == P.beginOffset() - Offsets.S->beginOffset() && \"Previous split does not end where this one begins!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3738, __PRETTY_FUNCTION__));

    // Record each split. The last partition's end isn't needed as the size
    // of the slice dictates that.
    if (S->endOffset() > P.endOffset())
      Offsets.Splits.push_back(P.endOffset() - Offsets.S->beginOffset());
  }
}

// We may have split loads where some of their stores are split stores. For
// such loads and stores, we can only pre-split them if their splits exactly
// match relative to their starting offset. We have to verify this prior to
// any rewriting.
Stores.erase(
    llvm::remove_if(Stores,
                    [&UnsplittableLoads, &SplitOffsetsMap](StoreInst *SI) {
                      // Lookup the load we are storing in our map of split
                      // offsets.
                      auto *LI = cast<LoadInst>(SI->getValueOperand());
                      // If it was completely unsplittable, then we're done,
                      // and this store can't be pre-split.
                      if (UnsplittableLoads.count(LI))
                        return true;

                      auto LoadOffsetsI = SplitOffsetsMap.find(LI);
                      if (LoadOffsetsI == SplitOffsetsMap.end())
                        return false; // Unrelated loads are definitely safe.
                      auto &LoadOffsets = LoadOffsetsI->second;

                      // Now lookup the store's offsets.
                      auto &StoreOffsets = SplitOffsetsMap[SI];

                      // If the relative offsets of each split in the load and
                      // store match exactly, then we can split them and we
                      // don't need to remove them here.
                      if (LoadOffsets.Splits == StoreOffsets.Splits)
                        return false;

                      LLVM_DEBUG(do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    Mismatched splits for load and store:\n"
 << "      " << *LI << "\n" << "      "
 << *SI << "\n"; } } while (false)
                          dbgs()do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    Mismatched splits for load and store:\n"
 << "      " << *LI << "\n" << "      "
 << *SI << "\n"; } } while (false)
                          << "    Mismatched splits for load and store:\n"do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    Mismatched splits for load and store:\n"
 << "      " << *LI << "\n" << "      "
 << *SI << "\n"; } } while (false)
                          << "      " << *LI << "\n"do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    Mismatched splits for load and store:\n"
 << "      " << *LI << "\n" << "      "
 << *SI << "\n"; } } while (false)
                          << "      " << *SI << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    Mismatched splits for load and store:\n"
 << "      " << *LI << "\n" << "      "
 << *SI << "\n"; } } while (false);

                      // We've found a store and load that we need to split
                      // with mismatched relative splits. Just give up on them
                      // and remove both instructions from our list of
                      // candidates.
                      UnsplittableLoads.insert(LI);
                      return true;
                    }),
    Stores.end());
// Now we have to go *back* through all the stores, because a later store may
// have caused an earlier store's load to become unsplittable and if it is
// unsplittable for the later store, then we can't rely on it being split in
// the earlier store either.
Stores.erase(llvm::remove_if(Stores,
                             [&UnsplittableLoads](StoreInst *SI) {
                               auto *LI =
                                   cast<LoadInst>(SI->getValueOperand());
                               return UnsplittableLoads.count(LI);
                             }),
             Stores.end());
// Once we've established all the loads that can't be split for some reason,
// filter any that made it into our list out.
Loads.erase(llvm::remove_if(Loads,
                            [&UnsplittableLoads](LoadInst *LI) {
                              return UnsplittableLoads.count(LI);
                            }),
            Loads.end());

// If no loads or stores are left, there is no pre-splitting to be done for
// this alloca.
if (Loads.empty() && Stores.empty())
  return false;

// From here on, we can't fail and will be building new accesses, so rig up
// an IR builder.
IRBuilderTy IRB(&AI);

// Collect the new slices which we will merge into the alloca slices.
SmallVector<Slice, 4> NewSlices;

// Track any allocas we end up splitting loads and stores for so we iterate
// on them.
SmallPtrSet<AllocaInst *, 4> ResplitPromotableAllocas;

// At this point, we have collected all of the loads and stores we can
// pre-split, and the specific splits needed for them. We actually do the
// splitting in a specific order in order to handle when one of the loads in
// the value operand to one of the stores.
//
// First, we rewrite all of the split loads, and just accumulate each split
// load in a parallel structure. We also build the slices for them and append
// them to the alloca slices.
SmallDenseMap<LoadInst *, std::vector<LoadInst *>, 1> SplitLoadsMap;
std::vector<LoadInst *> SplitLoads;
const DataLayout &DL = AI.getModule()->getDataLayout();
for (LoadInst *LI : Loads) {
  SplitLoads.clear();

  IntegerType *Ty = cast<IntegerType>(LI->getType());
  uint64_t LoadSize = Ty->getBitWidth() / 8;
  assert(LoadSize > 0 && "Cannot have a zero-sized integer load!")((LoadSize > 0 && "Cannot have a zero-sized integer load!"
) ? static_cast<void> (0) : __assert_fail ("LoadSize > 0 && \"Cannot have a zero-sized integer load!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3841, __PRETTY_FUNCTION__));

  auto &Offsets = SplitOffsetsMap[LI];
  assert(LoadSize == Offsets.S->endOffset() - Offsets.S->beginOffset() &&((LoadSize == Offsets.S->endOffset() - Offsets.S->beginOffset
() && "Slice size should always match load size exactly!"
) ? static_cast<void> (0) : __assert_fail ("LoadSize == Offsets.S->endOffset() - Offsets.S->beginOffset() && \"Slice size should always match load size exactly!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3845, __PRETTY_FUNCTION__))
         "Slice size should always match load size exactly!")((LoadSize == Offsets.S->endOffset() - Offsets.S->beginOffset
() && "Slice size should always match load size exactly!"
) ? static_cast<void> (0) : __assert_fail ("LoadSize == Offsets.S->endOffset() - Offsets.S->beginOffset() && \"Slice size should always match load size exactly!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3845, __PRETTY_FUNCTION__));
  uint64_t BaseOffset = Offsets.S->beginOffset();
  assert(BaseOffset + LoadSize > BaseOffset &&((BaseOffset + LoadSize > BaseOffset && "Cannot represent alloca access size using 64-bit integers!"
) ? static_cast<void> (0) : __assert_fail ("BaseOffset + LoadSize > BaseOffset && \"Cannot represent alloca access size using 64-bit integers!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3848, __PRETTY_FUNCTION__))
         "Cannot represent alloca access size using 64-bit integers!")((BaseOffset + LoadSize > BaseOffset && "Cannot represent alloca access size using 64-bit integers!"
) ? static_cast<void> (0) : __assert_fail ("BaseOffset + LoadSize > BaseOffset && \"Cannot represent alloca access size using 64-bit integers!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3848, __PRETTY_FUNCTION__));

  Instruction *BasePtr = cast<Instruction>(LI->getPointerOperand());
  IRB.SetInsertPoint(LI);

  LLVM_DEBUG(dbgs() << "  Splitting load: " << *LI << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "  Splitting load: " << *LI
 << "\n"; } } while (false);

  uint64_t PartOffset = 0, PartSize = Offsets.Splits.front();
  int Idx = 0, Size = Offsets.Splits.size();
  for (;;) {
    auto *PartTy = Type::getIntNTy(Ty->getContext(), PartSize * 8);
    auto AS = LI->getPointerAddressSpace();
    auto *PartPtrTy = PartTy->getPointerTo(AS);
    LoadInst *PLoad = IRB.CreateAlignedLoad(
        PartTy,
        getAdjustedPtr(IRB, DL, BasePtr,
                       APInt(DL.getIndexSizeInBits(AS), PartOffset),
                       PartPtrTy, BasePtr->getName() + "."),
        getAdjustedAlignment(LI, PartOffset, DL), /*IsVolatile*/ false,
        LI->getName());
    PLoad->copyMetadata(*LI, {LLVMContext::MD_mem_parallel_loop_access,
                              LLVMContext::MD_access_group});

    // Append this load onto the list of split loads so we can find it later
    // to rewrite the stores.
    SplitLoads.push_back(PLoad);

    // Now build a new slice for the alloca.
    NewSlices.push_back(
        Slice(BaseOffset + PartOffset, BaseOffset + PartOffset + PartSize,
              &PLoad->getOperandUse(PLoad->getPointerOperandIndex()),
              /*IsSplittable*/ false));
    LLVM_DEBUG(dbgs() << "    new slice [" << NewSlices.back().beginOffset()do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    new slice [" << NewSlices
.back().beginOffset() << ", " << NewSlices.back()
.endOffset() << "): " << *PLoad << "\n"; } }
 while (false)
                      << ", " << NewSlices.back().endOffset()do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    new slice [" << NewSlices
.back().beginOffset() << ", " << NewSlices.back()
.endOffset() << "): " << *PLoad << "\n"; } }
 while (false)
                      << "): " << *PLoad << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    new slice [" << NewSlices
.back().beginOffset() << ", " << NewSlices.back()
.endOffset() << "): " << *PLoad << "\n"; } }
 while (false);

    // See if we've handled all the splits.
    if (Idx >= Size)
      break;

    // Setup the next partition.
    PartOffset = Offsets.Splits[Idx];
    ++Idx;
    PartSize = (Idx < Size ? Offsets.Splits[Idx] : LoadSize) - PartOffset;
  }

  // Now that we have the split loads, do the slow walk over all uses of the
  // load and rewrite them as split stores, or save the split loads to use
  // below if the store is going to be split there anyways.
  bool DeferredStores = false;
  for (User *LU : LI->users()) {
    StoreInst *SI = cast<StoreInst>(LU);
    if (!Stores.empty() && SplitOffsetsMap.count(SI)) {
      DeferredStores = true;
      LLVM_DEBUG(dbgs() << "    Deferred splitting of store: " << *SIdo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    Deferred splitting of store: "
 << *SI << "\n"; } } while (false)
                        << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    Deferred splitting of store: "
 << *SI << "\n"; } } while (false);
      continue;
    }

    Value *StoreBasePtr = SI->getPointerOperand();
    IRB.SetInsertPoint(SI);

    LLVM_DEBUG(dbgs() << "    Splitting store of load: " << *SI << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    Splitting store of load: " <<
 *SI << "\n"; } } while (false);

    for (int Idx = 0, Size = SplitLoads.size(); Idx < Size; ++Idx) {
      LoadInst *PLoad = SplitLoads[Idx];
      uint64_t PartOffset = Idx == 0 ? 0 : Offsets.Splits[Idx - 1];
      auto *PartPtrTy =
          PLoad->getType()->getPointerTo(SI->getPointerAddressSpace());

      auto AS = SI->getPointerAddressSpace();
      StoreInst *PStore = IRB.CreateAlignedStore(
          PLoad,
          getAdjustedPtr(IRB, DL, StoreBasePtr,
                         APInt(DL.getIndexSizeInBits(AS), PartOffset),
                         PartPtrTy, StoreBasePtr->getName() + "."),
          getAdjustedAlignment(SI, PartOffset, DL), /*IsVolatile*/ false);
      PStore->copyMetadata(*LI, {LLVMContext::MD_mem_parallel_loop_access,
                                 LLVMContext::MD_access_group});
      LLVM_DEBUG(dbgs() << "      +" << PartOffset << ":" << *PStore << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "      +" << PartOffset <<
 ":" << *PStore << "\n"; } } while (false);
    }

    // We want to immediately iterate on any allocas impacted by splitting
    // this store, and we have to track any promotable alloca (indicated by
    // a direct store) as needing to be resplit because it is no longer
    // promotable.
    if (AllocaInst *OtherAI = dyn_cast<AllocaInst>(StoreBasePtr)) {
      ResplitPromotableAllocas.insert(OtherAI);
      Worklist.insert(OtherAI);
    } else if (AllocaInst *OtherAI = dyn_cast<AllocaInst>(
                   StoreBasePtr->stripInBoundsOffsets())) {
      Worklist.insert(OtherAI);
    }

    // Mark the original store as dead.
    DeadInsts.insert(SI);
  }

  // Save the split loads if there are deferred stores among the users.
  if (DeferredStores)
    SplitLoadsMap.insert(std::make_pair(LI, std::move(SplitLoads)));

  // Mark the original load as dead and kill the original slice.
  DeadInsts.insert(LI);
  Offsets.S->kill();
}

// Second, we rewrite all of the split stores. At this point, we know that
// all loads from this alloca have been split already. For stores of such
// loads, we can simply look up the pre-existing split loads. For stores of
// other loads, we split those loads first and then write split stores of
// them.
for (StoreInst *SI : Stores) {
  auto *LI = cast<LoadInst>(SI->getValueOperand());
  IntegerType *Ty = cast<IntegerType>(LI->getType());
  uint64_t StoreSize = Ty->getBitWidth() / 8;
  assert(StoreSize > 0 && "Cannot have a zero-sized integer store!")((StoreSize > 0 && "Cannot have a zero-sized integer store!"
) ? static_cast<void> (0) : __assert_fail ("StoreSize > 0 && \"Cannot have a zero-sized integer store!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3964, __PRETTY_FUNCTION__));

  auto &Offsets = SplitOffsetsMap[SI];
  assert(StoreSize == Offsets.S->endOffset() - Offsets.S->beginOffset() &&((StoreSize == Offsets.S->endOffset() - Offsets.S->beginOffset
() && "Slice size should always match load size exactly!"
) ? static_cast<void> (0) : __assert_fail ("StoreSize == Offsets.S->endOffset() - Offsets.S->beginOffset() && \"Slice size should always match load size exactly!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3968, __PRETTY_FUNCTION__))
         "Slice size should always match load size exactly!")((StoreSize == Offsets.S->endOffset() - Offsets.S->beginOffset
() && "Slice size should always match load size exactly!"
) ? static_cast<void> (0) : __assert_fail ("StoreSize == Offsets.S->endOffset() - Offsets.S->beginOffset() && \"Slice size should always match load size exactly!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3968, __PRETTY_FUNCTION__));
  uint64_t BaseOffset = Offsets.S->beginOffset();
  assert(BaseOffset + StoreSize > BaseOffset &&((BaseOffset + StoreSize > BaseOffset && "Cannot represent alloca access size using 64-bit integers!"
) ? static_cast<void> (0) : __assert_fail ("BaseOffset + StoreSize > BaseOffset && \"Cannot represent alloca access size using 64-bit integers!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3971, __PRETTY_FUNCTION__))
         "Cannot represent alloca access size using 64-bit integers!")((BaseOffset + StoreSize > BaseOffset && "Cannot represent alloca access size using 64-bit integers!"
) ? static_cast<void> (0) : __assert_fail ("BaseOffset + StoreSize > BaseOffset && \"Cannot represent alloca access size using 64-bit integers!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3971, __PRETTY_FUNCTION__));

  Value *LoadBasePtr = LI->getPointerOperand();
  Instruction *StoreBasePtr = cast<Instruction>(SI->getPointerOperand());

  LLVM_DEBUG(dbgs() << "  Splitting store: " << *SI << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "  Splitting store: " << *SI
 << "\n"; } } while (false);

  // Check whether we have an already split load.
  auto SplitLoadsMapI = SplitLoadsMap.find(LI);
  std::vector<LoadInst *> *SplitLoads = nullptr;
  if (SplitLoadsMapI != SplitLoadsMap.end()) {
    SplitLoads = &SplitLoadsMapI->second;
    assert(SplitLoads->size() == Offsets.Splits.size() + 1 &&((SplitLoads->size() == Offsets.Splits.size() + 1 &&
 "Too few split loads for the number of splits in the store!"
) ? static_cast<void> (0) : __assert_fail ("SplitLoads->size() == Offsets.Splits.size() + 1 && \"Too few split loads for the number of splits in the store!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3984, __PRETTY_FUNCTION__))
           "Too few split loads for the number of splits in the store!")((SplitLoads->size() == Offsets.Splits.size() + 1 &&
 "Too few split loads for the number of splits in the store!"
) ? static_cast<void> (0) : __assert_fail ("SplitLoads->size() == Offsets.Splits.size() + 1 && \"Too few split loads for the number of splits in the store!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 3984, __PRETTY_FUNCTION__));
  } else {
    LLVM_DEBUG(dbgs() << "          of load: " << *LI << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "          of load: " << *LI
 << "\n"; } } while (false);
  }

  uint64_t PartOffset = 0, PartSize = Offsets.Splits.front();
  int Idx = 0, Size = Offsets.Splits.size();
  for (;;) {
    auto *PartTy = Type::getIntNTy(Ty->getContext(), PartSize * 8);
    auto *LoadPartPtrTy = PartTy->getPointerTo(LI->getPointerAddressSpace());
    auto *StorePartPtrTy = PartTy->getPointerTo(SI->getPointerAddressSpace());

    // Either lookup a split load or create one.
    LoadInst *PLoad;
    if (SplitLoads) {
      PLoad = (*SplitLoads)[Idx];
    } else {
      IRB.SetInsertPoint(LI);
      auto AS = LI->getPointerAddressSpace();
      PLoad = IRB.CreateAlignedLoad(
          PartTy,
          getAdjustedPtr(IRB, DL, LoadBasePtr,
                         APInt(DL.getIndexSizeInBits(AS), PartOffset),
                         LoadPartPtrTy, LoadBasePtr->getName() + "."),
          getAdjustedAlignment(LI, PartOffset, DL), /*IsVolatile*/ false,
          LI->getName());
    }

    // And store this partition.
    IRB.SetInsertPoint(SI);
    auto AS = SI->getPointerAddressSpace();
    StoreInst *PStore = IRB.CreateAlignedStore(
        PLoad,
        getAdjustedPtr(IRB, DL, StoreBasePtr,
                       APInt(DL.getIndexSizeInBits(AS), PartOffset),
                       StorePartPtrTy, StoreBasePtr->getName() + "."),
        getAdjustedAlignment(SI, PartOffset, DL), /*IsVolatile*/ false);

    // Now build a new slice for the alloca.
    NewSlices.push_back(
        Slice(BaseOffset + PartOffset, BaseOffset + PartOffset + PartSize,
              &PStore->getOperandUse(PStore->getPointerOperandIndex()),
              /*IsSplittable*/ false));
    LLVM_DEBUG(dbgs() << "    new slice [" << NewSlices.back().beginOffset()do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    new slice [" << NewSlices
.back().beginOffset() << ", " << NewSlices.back()
.endOffset() << "): " << *PStore << "\n"; }
 } while (false)
                      << ", " << NewSlices.back().endOffset()do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    new slice [" << NewSlices
.back().beginOffset() << ", " << NewSlices.back()
.endOffset() << "): " << *PStore << "\n"; }
 } while (false)
                      << "): " << *PStore << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "    new slice [" << NewSlices
.back().beginOffset() << ", " << NewSlices.back()
.endOffset() << "): " << *PStore << "\n"; }
 } while (false);
    if (!SplitLoads) {
      LLVM_DEBUG(dbgs() << "      of split load: " << *PLoad << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "      of split load: " << *
PLoad << "\n"; } } while (false);
    }

    // See if we've finished all the splits.
    if (Idx >= Size)
      break;

    // Setup the next partition.
    PartOffset = Offsets.Splits[Idx];
    ++Idx;
    PartSize = (Idx < Size ? Offsets.Splits[Idx] : StoreSize) - PartOffset;
  }

  // We want to immediately iterate on any allocas impacted by splitting
  // this load, which is only relevant if it isn't a load of this alloca and
  // thus we didn't already split the loads above. We also have to keep track
  // of any promotable allocas we split loads on as they can no longer be
  // promoted.
  if (!SplitLoads) {
    if (AllocaInst *OtherAI = dyn_cast<AllocaInst>(LoadBasePtr)) {
      assert(OtherAI != &AI && "We can't re-split our own alloca!")((OtherAI != &AI && "We can't re-split our own alloca!"
) ? static_cast<void> (0) : __assert_fail ("OtherAI != &AI && \"We can't re-split our own alloca!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 4051, __PRETTY_FUNCTION__));
      ResplitPromotableAllocas.insert(OtherAI);
      Worklist.insert(OtherAI);
    } else if (AllocaInst *OtherAI = dyn_cast<AllocaInst>(
                   LoadBasePtr->stripInBoundsOffsets())) {
      assert(OtherAI != &AI && "We can't re-split our own alloca!")((OtherAI != &AI && "We can't re-split our own alloca!"
) ? static_cast<void> (0) : __assert_fail ("OtherAI != &AI && \"We can't re-split our own alloca!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 4056, __PRETTY_FUNCTION__));
      Worklist.insert(OtherAI);
    }
  }

  // Mark the original store as dead now that we've split it up and kill its
  // slice. Note that we leave the original load in place unless this store
  // was its only use. It may in turn be split up if it is an alloca load
  // for some other alloca, but it may be a normal load. This may introduce
  // redundant loads, but where those can be merged the rest of the optimizer
  // should handle the merging, and this uncovers SSA splits which is more
  // important. In practice, the original loads will almost always be fully
  // split and removed eventually, and the splits will be merged by any
  // trivial CSE, including instcombine.
  if (LI->hasOneUse()) {
    assert(*LI->user_begin() == SI && "Single use isn't this store!")((*LI->user_begin() == SI && "Single use isn't this store!"
) ? static_cast<void> (0) : __assert_fail ("*LI->user_begin() == SI && \"Single use isn't this store!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 4071, __PRETTY_FUNCTION__));
    DeadInsts.insert(LI);
  }
  DeadInsts.insert(SI);
  Offsets.S->kill();
}

// Remove the killed slices that have ben pre-split.
AS.erase(llvm::remove_if(AS, [](const Slice &S) { return S.isDead(); }),
         AS.end());

// Insert our new slices. This will sort and merge them into the sorted
// sequence.
AS.insert(NewSlices);

LLVM_DEBUG(dbgs() << "  Pre-split slices:\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "  Pre-split slices:\n"; } } while
 (false);
4087#ifndef NDEBUG
for (auto I = AS.begin(), E = AS.end(); I != E; ++I)
  LLVM_DEBUG(AS.print(dbgs(), I, "    "))do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { AS.print(dbgs(), I, "    "); } } while (false);
4090#endif

// Finally, don't try to promote any allocas that new require re-splitting.
// They have already been added to the worklist above.
PromotableAllocas.erase(
    llvm::remove_if(
        PromotableAllocas,
        [&](AllocaInst *AI) { return ResplitPromotableAllocas.count(AI); }),
    PromotableAllocas.end());

return true;
4101}

4103/// Rewrite an alloca partition's users.
4104///
4105/// This routine drives both of the rewriting goals of the SROA pass. It tries
4106/// to rewrite uses of an alloca partition to be conducive for SSA value
4107/// promotion. If the partition needs a new, more refined alloca, this will
4108/// build that new alloca, preserving as much type information as possible, and
4109/// rewrite the uses of the old alloca to point at the new one and have the
4110/// appropriate new offsets. It also evaluates how successful the rewrite was
4111/// at enabling promotion and if it was successful queues the alloca to be
4112/// promoted.
4113AllocaInst *SROA::rewritePartition(AllocaInst &AI, AllocaSlices &AS,
                                 Partition &P) {
// Try to compute a friendly type for this partition of the alloca. This
// won't always succeed, in which case we fall back to a legal integer type
// or an i8 array of an appropriate size.
Type *SliceTy = nullptr;
const DataLayout &DL = AI.getModule()->getDataLayout();
if (Type *CommonUseTy = findCommonType(P.begin(), P.end(), P.endOffset()))
  if (DL.getTypeAllocSize(CommonUseTy) >= P.size())
    SliceTy = CommonUseTy;
if (!SliceTy)
  if (Type *TypePartitionTy = getTypePartition(DL, AI.getAllocatedType(),
                                               P.beginOffset(), P.size()))
    SliceTy = TypePartitionTy;
if ((!SliceTy || (SliceTy->isArrayTy() &&
                  SliceTy->getArrayElementType()->isIntegerTy())) &&
    DL.isLegalInteger(P.size() * 8))
  SliceTy = Type::getIntNTy(*C, P.size() * 8);
if (!SliceTy)
  SliceTy = ArrayType::get(Type::getInt8Ty(*C), P.size());
assert(DL.getTypeAllocSize(SliceTy) >= P.size())((DL.getTypeAllocSize(SliceTy) >= P.size()) ? static_cast<
void> (0) : __assert_fail ("DL.getTypeAllocSize(SliceTy) >= P.size()"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 4133, __PRETTY_FUNCTION__));

bool IsIntegerPromotable = isIntegerWideningViable(P, SliceTy, DL);

VectorType *VecTy =
    IsIntegerPromotable ? nullptr : isVectorPromotionViable(P, DL);
if (VecTy)
  SliceTy = VecTy;

// Check for the case where we're going to rewrite to a new alloca of the
// exact same type as the original, and with the same access offsets. In that
// case, re-use the existing alloca, but still run through the rewriter to
// perform phi and select speculation.
// P.beginOffset() can be non-zero even with the same type in a case with
// out-of-bounds access (e.g. @PR35657 function in SROA/basictest.ll).
AllocaInst *NewAI;
if (SliceTy == AI.getAllocatedType() && P.beginOffset() == 0) {
  NewAI = &AI;
  // FIXME: We should be able to bail at this point with "nothing changed".
  // FIXME: We might want to defer PHI speculation until after here.
  // FIXME: return nullptr;
} else {
  // If alignment is unspecified we fallback on the one required by the ABI
  // for this type. We also make sure the alignment is compatible with
  // P.beginOffset().
  const Align Alignment = commonAlignment(
      DL.getValueOrABITypeAlignment(MaybeAlign(AI.getAlignment()),
                                    AI.getAllocatedType()),
      P.beginOffset());
  // If we will get at least this much alignment from the type alone, leave
  // the alloca's alignment unconstrained.
  const bool IsUnconstrained = Alignment <= DL.getABITypeAlignment(SliceTy);
  NewAI = new AllocaInst(
      SliceTy, AI.getType()->getAddressSpace(), nullptr,
      IsUnconstrained ? MaybeAlign() : Alignment,
      AI.getName() + ".sroa." + Twine(P.begin() - AS.begin()), &AI);
  // Copy the old AI debug location over to the new one.
  NewAI->setDebugLoc(AI.getDebugLoc());
  ++NumNewAllocas;
}

LLVM_DEBUG(dbgs() << "Rewriting alloca partition "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "Rewriting alloca partition " <<
 "[" << P.beginOffset() << "," << P.endOffset
() << ") to: " << *NewAI << "\n"; } } while
 (false)
                  << "[" << P.beginOffset() << "," << P.endOffset()do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "Rewriting alloca partition " <<
 "[" << P.beginOffset() << "," << P.endOffset
() << ") to: " << *NewAI << "\n"; } } while
 (false)
                  << ") to: " << *NewAI << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "Rewriting alloca partition " <<
 "[" << P.beginOffset() << "," << P.endOffset
() << ") to: " << *NewAI << "\n"; } } while
 (false);

// Track the high watermark on the worklist as it is only relevant for
// promoted allocas. We will reset it to this point if the alloca is not in
// fact scheduled for promotion.
unsigned PPWOldSize = PostPromotionWorklist.size();
unsigned NumUses = 0;
SmallSetVector<PHINode *, 8> PHIUsers;
SmallSetVector<SelectInst *, 8> SelectUsers;

AllocaSliceRewriter Rewriter(DL, AS, *this, AI, *NewAI, P.beginOffset(),
                             P.endOffset(), IsIntegerPromotable, VecTy,
                             PHIUsers, SelectUsers);
bool Promotable = true;
for (Slice *S : P.splitSliceTails()) {
  Promotable &= Rewriter.visit(S);
  ++NumUses;
}
for (Slice &S : P) {
  Promotable &= Rewriter.visit(&S);
  ++NumUses;
}

NumAllocaPartitionUses += NumUses;
MaxUsesPerAllocaPartition.updateMax(NumUses);

// Now that we've processed all the slices in the new partition, check if any
// PHIs or Selects would block promotion.
for (PHINode *PHI : PHIUsers)
  if (!isSafePHIToSpeculate(*PHI)) {
    Promotable = false;
    PHIUsers.clear();
    SelectUsers.clear();
    break;
  }

for (SelectInst *Sel : SelectUsers)
  if (!isSafeSelectToSpeculate(*Sel)) {
    Promotable = false;
    PHIUsers.clear();
    SelectUsers.clear();
    break;
  }

if (Promotable) {
  if (PHIUsers.empty() && SelectUsers.empty()) {
    // Promote the alloca.
    PromotableAllocas.push_back(NewAI);
  } else {
    // If we have either PHIs or Selects to speculate, add them to those
    // worklists and re-queue the new alloca so that we promote in on the
    // next iteration.
    for (PHINode *PHIUser : PHIUsers)
      SpeculatablePHIs.insert(PHIUser);
    for (SelectInst *SelectUser : SelectUsers)
      SpeculatableSelects.insert(SelectUser);
    Worklist.insert(NewAI);
  }
} else {
  // Drop any post-promotion work items if promotion didn't happen.
  while (PostPromotionWorklist.size() > PPWOldSize)
    PostPromotionWorklist.pop_back();

  // We couldn't promote and we didn't create a new partition, nothing
  // happened.
  if (NewAI == &AI)
    return nullptr;

  // If we can't promote the alloca, iterate on it to check for new
  // refinements exposed by splitting the current alloca. Don't iterate on an
  // alloca which didn't actually change and didn't get promoted.
  Worklist.insert(NewAI);
}

return NewAI;
4251}

4253/// Walks the slices of an alloca and form partitions based on them,
4254/// rewriting each of their uses.
4255bool SROA::splitAlloca(AllocaInst &AI, AllocaSlices &AS) {
if (AS.begin() == AS.end())
  return false;

unsigned NumPartitions = 0;
bool Changed = false;
const DataLayout &DL = AI.getModule()->getDataLayout();

// First try to pre-split loads and stores.
Changed |= presplitLoadsAndStores(AI, AS);

// Now that we have identified any pre-splitting opportunities,
// mark loads and stores unsplittable except for the following case.
// We leave a slice splittable if all other slices are disjoint or fully
// included in the slice, such as whole-alloca loads and stores.
// If we fail to split these during pre-splitting, we want to force them
// to be rewritten into a partition.
bool IsSorted = true;

uint64_t AllocaSize = DL.getTypeAllocSize(AI.getAllocatedType());
const uint64_t MaxBitVectorSize = 1024;
if (AllocaSize <= MaxBitVectorSize) {
  // If a byte boundary is included in any load or store, a slice starting or
  // ending at the boundary is not splittable.
  SmallBitVector SplittableOffset(AllocaSize + 1, true);
  for (Slice &S : AS)
    for (unsigned O = S.beginOffset() + 1;
         O < S.endOffset() && O < AllocaSize; O++)
      SplittableOffset.reset(O);

  for (Slice &S : AS) {
    if (!S.isSplittable())
      continue;

    if ((S.beginOffset() > AllocaSize || SplittableOffset[S.beginOffset()]) &&
        (S.endOffset() > AllocaSize || SplittableOffset[S.endOffset()]))
      continue;

    if (isa<LoadInst>(S.getUse()->getUser()) ||
        isa<StoreInst>(S.getUse()->getUser())) {
      S.makeUnsplittable();
      IsSorted = false;
    }
  }
}
else {
  // We only allow whole-alloca splittable loads and stores
  // for a large alloca to avoid creating too large BitVector.
  for (Slice &S : AS) {
    if (!S.isSplittable())
      continue;

    if (S.beginOffset() == 0 && S.endOffset() >= AllocaSize)
      continue;

    if (isa<LoadInst>(S.getUse()->getUser()) ||
        isa<StoreInst>(S.getUse()->getUser())) {
      S.makeUnsplittable();
      IsSorted = false;
    }
  }
}

if (!IsSorted)
  llvm::sort(AS);

/// Describes the allocas introduced by rewritePartition in order to migrate
/// the debug info.
struct Fragment {
  AllocaInst *Alloca;
  uint64_t Offset;
  uint64_t Size;
  Fragment(AllocaInst *AI, uint64_t O, uint64_t S)
    : Alloca(AI), Offset(O), Size(S) {}
};
SmallVector<Fragment, 4> Fragments;

// Rewrite each partition.
for (auto &P : AS.partitions()) {
  if (AllocaInst *NewAI = rewritePartition(AI, AS, P)) {
    Changed = true;
    if (NewAI != &AI) {
      uint64_t SizeOfByte = 8;
      uint64_t AllocaSize = DL.getTypeSizeInBits(NewAI->getAllocatedType());
      // Don't include any padding.
      uint64_t Size = std::min(AllocaSize, P.size() * SizeOfByte);
      Fragments.push_back(Fragment(NewAI, P.beginOffset() * SizeOfByte, Size));
    }
  }
  ++NumPartitions;
}

NumAllocaPartitions += NumPartitions;
MaxPartitionsPerAlloca.updateMax(NumPartitions);

// Migrate debug information from the old alloca to the new alloca(s)
// and the individual partitions.
TinyPtrVector<DbgVariableIntrinsic *> DbgDeclares = FindDbgAddrUses(&AI);
if (!DbgDeclares.empty()) {
  auto *Var = DbgDeclares.front()->getVariable();
  auto *Expr = DbgDeclares.front()->getExpression();
  auto VarSize = Var->getSizeInBits();
  DIBuilder DIB(*AI.getModule(), /*AllowUnresolved*/ false);
  uint64_t AllocaSize = DL.getTypeSizeInBits(AI.getAllocatedType());
  for (auto Fragment : Fragments) {
    // Create a fragment expression describing the new partition or reuse AI's
    // expression if there is only one partition.
    auto *FragmentExpr = Expr;
    if (Fragment.Size < AllocaSize || Expr->isFragment()) {
      // If this alloca is already a scalar replacement of a larger aggregate,
      // Fragment.Offset describes the offset inside the scalar.
      auto ExprFragment = Expr->getFragmentInfo();
      uint64_t Offset = ExprFragment ? ExprFragment->OffsetInBits : 0;
      uint64_t Start = Offset + Fragment.Offset;
      uint64_t Size = Fragment.Size;
      if (ExprFragment) {
        uint64_t AbsEnd =
            ExprFragment->OffsetInBits + ExprFragment->SizeInBits;
        if (Start >= AbsEnd)
          // No need to describe a SROAed padding.
          continue;
        Size = std::min(Size, AbsEnd - Start);
      }
      // The new, smaller fragment is stenciled out from the old fragment.
      if (auto OrigFragment = FragmentExpr->getFragmentInfo()) {
        assert(Start >= OrigFragment->OffsetInBits &&((Start >= OrigFragment->OffsetInBits && "new fragment is outside of original fragment"
) ? static_cast<void> (0) : __assert_fail ("Start >= OrigFragment->OffsetInBits && \"new fragment is outside of original fragment\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 4381, __PRETTY_FUNCTION__))
               "new fragment is outside of original fragment")((Start >= OrigFragment->OffsetInBits && "new fragment is outside of original fragment"
) ? static_cast<void> (0) : __assert_fail ("Start >= OrigFragment->OffsetInBits && \"new fragment is outside of original fragment\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/lib/Transforms/Scalar/SROA.cpp"
, 4381, __PRETTY_FUNCTION__));
        Start -= OrigFragment->OffsetInBits;
      }

      // The alloca may be larger than the variable.
      if (VarSize) {
        if (Size > *VarSize)
          Size = *VarSize;
        if (Size == 0 || Start + Size > *VarSize)
          continue;
      }

      // Avoid creating a fragment expression that covers the entire variable.
      if (!VarSize || *VarSize != Size) {
        if (auto E =
                DIExpression::createFragmentExpression(Expr, Start, Size))
          FragmentExpr = *E;
        else
          continue;
      }
    }

    // Remove any existing intrinsics describing the same alloca.
    for (DbgVariableIntrinsic *OldDII : FindDbgAddrUses(Fragment.Alloca))
      OldDII->eraseFromParent();

    DIB.insertDeclare(Fragment.Alloca, Var, FragmentExpr,
                      DbgDeclares.front()->getDebugLoc(), &AI);
  }
}
return Changed;
4412}

4414/// Clobber a use with undef, deleting the used value if it becomes dead.
4415void SROA::clobberUse(Use &U) {
Value *OldV = U;
// Replace the use with an undef value.
U = UndefValue::get(OldV->getType());

// Check for this making an instruction dead. We have to garbage collect
// all the dead instructions to ensure the uses of any alloca end up being
// minimal.
if (Instruction *OldI = dyn_cast<Instruction>(OldV))
  if (isInstructionTriviallyDead(OldI)) {
    DeadInsts.insert(OldI);
  }
4427}

4429/// Analyze an alloca for SROA.
4430///
4431/// This analyzes the alloca to ensure we can reason about it, builds
4432/// the slices of the alloca, and then hands it off to be split and
4433/// rewritten as needed.
4434bool SROA::runOnAlloca(AllocaInst &AI) {
LLVM_DEBUG(dbgs() << "SROA alloca: " << AI << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "SROA alloca: " << AI <<
 "\n"; } } while (false);
++NumAllocasAnalyzed;

// Special case dead allocas, as they're trivial.
if (AI.use_empty()) {
  AI.eraseFromParent();
  return true;
}
const DataLayout &DL = AI.getModule()->getDataLayout();

// Skip alloca forms that this analysis can't handle.
if (AI.isArrayAllocation() || !AI.getAllocatedType()->isSized() ||
    DL.getTypeAllocSize(AI.getAllocatedType()) == 0)
  return false;

bool Changed = false;

// First, split any FCA loads and stores touching this alloca to promote
// better splitting and promotion opportunities.
AggLoadStoreRewriter AggRewriter(DL);
Changed |= AggRewriter.rewrite(AI);

// Build the slices using a recursive instruction-visiting builder.
AllocaSlices AS(DL, AI);
LLVM_DEBUG(AS.print(dbgs()))do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { AS.print(dbgs()); } } while (false);
if (AS.isEscaped())
  return Changed;

// Delete all the dead users of this alloca before splitting and rewriting it.
for (Instruction *DeadUser : AS.getDeadUsers()) {
  // Free up everything used by this instruction.
  for (Use &DeadOp : DeadUser->operands())
    clobberUse(DeadOp);

  // Now replace the uses of this instruction.
  DeadUser->replaceAllUsesWith(UndefValue::get(DeadUser->getType()));

  // And mark it for deletion.
  DeadInsts.insert(DeadUser);
  Changed = true;
}
for (Use *DeadOp : AS.getDeadOperands()) {
  clobberUse(*DeadOp);
  Changed = true;
}

// No slices to split. Leave the dead alloca for a later pass to clean up.
if (AS.begin() == AS.end())
  return Changed;

Changed |= splitAlloca(AI, AS);

LLVM_DEBUG(dbgs() << "  Speculating PHIs\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "  Speculating PHIs\n"; } } while
 (false);
while (!SpeculatablePHIs.empty())
  speculatePHINodeLoads(*SpeculatablePHIs.pop_back_val());

LLVM_DEBUG(dbgs() << "  Speculating Selects\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "  Speculating Selects\n"; } } while
 (false);
while (!SpeculatableSelects.empty())
  speculateSelectInstLoads(*SpeculatableSelects.pop_back_val());

return Changed;
4496}

4498/// Delete the dead instructions accumulated in this run.
4499///
4500/// Recursively deletes the dead instructions we've accumulated. This is done
4501/// at the very end to maximize locality of the recursive delete and to
4502/// minimize the problems of invalidated instruction pointers as such pointers
4503/// are used heavily in the intermediate stages of the algorithm.
4504///
4505/// We also record the alloca instructions deleted here so that they aren't
4506/// subsequently handed to mem2reg to promote.
4507bool SROA::deleteDeadInstructions(
  SmallPtrSetImpl<AllocaInst *> &DeletedAllocas) {
bool Changed = false;
while (!DeadInsts.empty()) {
  Instruction *I = DeadInsts.pop_back_val();
  LLVM_DEBUG(dbgs() << "Deleting dead instruction: " << *I << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "Deleting dead instruction: " <<
 *I << "\n"; } } while (false);

  // If the instruction is an alloca, find the possible dbg.declare connected
  // to it, and remove it too. We must do this before calling RAUW or we will
  // not be able to find it.
  if (AllocaInst *AI = dyn_cast<AllocaInst>(I)) {
    DeletedAllocas.insert(AI);
    for (DbgVariableIntrinsic *OldDII : FindDbgAddrUses(AI))
      OldDII->eraseFromParent();
  }

  I->replaceAllUsesWith(UndefValue::get(I->getType()));

  for (Use &Operand : I->operands())
    if (Instruction *U = dyn_cast<Instruction>(Operand)) {
      // Zero out the operand and see if it becomes trivially dead.
      Operand = nullptr;
      if (isInstructionTriviallyDead(U))
        DeadInsts.insert(U);
    }

  ++NumDeleted;
  I->eraseFromParent();
  Changed = true;
}
return Changed;
4538}

4540/// Promote the allocas, using the best available technique.
4541///
4542/// This attempts to promote whatever allocas have been identified as viable in
4543/// the PromotableAllocas list. If that list is empty, there is nothing to do.
4544/// This function returns whether any promotion occurred.
4545bool SROA::promoteAllocas(Function &F) {
if (PromotableAllocas.empty())
  return false;

NumPromoted += PromotableAllocas.size();

LLVM_DEBUG(dbgs() << "Promoting allocas with mem2reg...\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "Promoting allocas with mem2reg...\n"
; } } while (false);
PromoteMemToReg(PromotableAllocas, *DT, AC);
PromotableAllocas.clear();
return true;
4555}

4557PreservedAnalyses SROA::runImpl(Function &F, DominatorTree &RunDT,
                              AssumptionCache &RunAC) {
LLVM_DEBUG(dbgs() << "SROA function: " << F.getName() << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("sroa")) { dbgs() << "SROA function: " << F.getName
() << "\n"; } } while (false);
C = &F.getContext();
DT = &RunDT;
AC = &RunAC;

BasicBlock &EntryBB = F.getEntryBlock();
for (BasicBlock::iterator I = EntryBB.begin(), E = std::prev(EntryBB.end());
     I != E; ++I) {
  if (AllocaInst *AI = dyn_cast<AllocaInst>(I))
    Worklist.insert(AI);
}

bool Changed = false;
// A set of deleted alloca instruction pointers which should be removed from
// the list of promotable allocas.
SmallPtrSet<AllocaInst *, 4> DeletedAllocas;

do {
  while (!Worklist.empty()) {
    Changed |= runOnAlloca(*Worklist.pop_back_val());
    Changed |= deleteDeadInstructions(DeletedAllocas);

    // Remove the deleted allocas from various lists so that we don't try to
    // continue processing them.
    if (!DeletedAllocas.empty()) {
      auto IsInSet = [&](AllocaInst *AI) { return DeletedAllocas.count(AI); };
      Worklist.remove_if(IsInSet);
      PostPromotionWorklist.remove_if(IsInSet);
      PromotableAllocas.erase(llvm::remove_if(PromotableAllocas, IsInSet),
                              PromotableAllocas.end());
      DeletedAllocas.clear();
    }
  }

  Changed |= promoteAllocas(F);

  Worklist = PostPromotionWorklist;
  PostPromotionWorklist.clear();
} while (!Worklist.empty());

if (!Changed)
  return PreservedAnalyses::all();

PreservedAnalyses PA;
PA.preserveSet<CFGAnalyses>();
PA.preserve<GlobalsAA>();
return PA;
4606}

4608PreservedAnalyses SROA::run(Function &F, FunctionAnalysisManager &AM) {
return runImpl(F, AM.getResult<DominatorTreeAnalysis>(F),
               AM.getResult<AssumptionAnalysis>(F));
4611}

4613/// A legacy pass for the legacy pass manager that wraps the \c SROA pass.
4614///
4615/// This is in the llvm namespace purely to allow it to be a friend of the \c
4616/// SROA pass.
4617class llvm::sroa::SROALegacyPass : public FunctionPass {
/// The SROA implementation.
SROA Impl;

4621public:
static char ID;

SROALegacyPass() : FunctionPass(ID) {
  initializeSROALegacyPassPass(*PassRegistry::getPassRegistry());
}

bool runOnFunction(Function &F) override {
  if (skipFunction(F))
    return false;

  auto PA = Impl.runImpl(
      F, getAnalysis<DominatorTreeWrapperPass>().getDomTree(),
      getAnalysis<AssumptionCacheTracker>().getAssumptionCache(F));
  return !PA.areAllPreserved();
}

void getAnalysisUsage(AnalysisUsage &AU) const override {
  AU.addRequired<AssumptionCacheTracker>();
  AU.addRequired<DominatorTreeWrapperPass>();
  AU.addPreserved<GlobalsAAWrapperPass>();
  AU.setPreservesCFG();
}

StringRef getPassName() const override { return "SROA"; }
4646};

4648char SROALegacyPass::ID = 0;

4650FunctionPass *llvm::createSROAPass() { return new SROALegacyPass(); }

4652INITIALIZE_PASS_BEGIN(SROALegacyPass, "sroa",static void *initializeSROALegacyPassPassOnce(PassRegistry &
Registry) {
                    "Scalar Replacement Of Aggregates", false, false)static void *initializeSROALegacyPassPassOnce(PassRegistry &
Registry) {
4654INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)initializeAssumptionCacheTrackerPass(Registry);
4655INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)initializeDominatorTreeWrapperPassPass(Registry);
4656INITIALIZE_PASS_END(SROALegacyPass, "sroa", "Scalar Replacement Of Aggregates",PassInfo *PI = new PassInfo( "Scalar Replacement Of Aggregates"
, "sroa", &SROALegacyPass::ID, PassInfo::NormalCtor_t(callDefaultCtor
<SROALegacyPass>), false, false); Registry.registerPass
(*PI, true); return PI; } static llvm::once_flag InitializeSROALegacyPassPassFlag
; void llvm::initializeSROALegacyPassPass(PassRegistry &Registry
) { llvm::call_once(InitializeSROALegacyPassPassFlag, initializeSROALegacyPassPassOnce
, std::ref(Registry)); }
                  false, false)PassInfo *PI = new PassInfo( "Scalar Replacement Of Aggregates"
, "sroa", &SROALegacyPass::ID, PassInfo::NormalCtor_t(callDefaultCtor
<SROALegacyPass>), false, false); Registry.registerPass
(*PI, true); return PI; } static llvm::once_flag InitializeSROALegacyPassPassFlag
; void llvm::initializeSROALegacyPassPass(PassRegistry &Registry
) { llvm::call_once(InitializeSROALegacyPassPassFlag, initializeSROALegacyPassPassOnce
, std::ref(Registry)); }

←

/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h

→

1//===- llvm/IRBuilder.h - Builder for LLVM Instructions ---------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file defines the IRBuilder class, which is used as a convenient way
10// to create LLVM instructions with a consistent and simplified interface.
11//
12//===----------------------------------------------------------------------===//

14#ifndef LLVM_IR_IRBUILDER_H
15#define LLVM_IR_IRBUILDER_H

17#include "llvm-c/Types.h"
18#include "llvm/ADT/ArrayRef.h"
19#include "llvm/ADT/None.h"
20#include "llvm/ADT/StringRef.h"
21#include "llvm/ADT/Twine.h"
22#include "llvm/IR/BasicBlock.h"
23#include "llvm/IR/Constant.h"
24#include "llvm/IR/ConstantFolder.h"
25#include "llvm/IR/Constants.h"
26#include "llvm/IR/DataLayout.h"
27#include "llvm/IR/DebugLoc.h"
28#include "llvm/IR/DerivedTypes.h"
29#include "llvm/IR/Function.h"
30#include "llvm/IR/GlobalVariable.h"
31#include "llvm/IR/InstrTypes.h"
32#include "llvm/IR/Instruction.h"
33#include "llvm/IR/Instructions.h"
34#include "llvm/IR/IntrinsicInst.h"
35#include "llvm/IR/LLVMContext.h"
36#include "llvm/IR/Module.h"
37#include "llvm/IR/Operator.h"
38#include "llvm/IR/Type.h"
39#include "llvm/IR/Value.h"
40#include "llvm/IR/ValueHandle.h"
41#include "llvm/Support/AtomicOrdering.h"
42#include "llvm/Support/CBindingWrapping.h"
43#include "llvm/Support/Casting.h"
44#include <cassert>
45#include <cstddef>
46#include <cstdint>
47#include <functional>
48#include <utility>

50namespace llvm {

52class APInt;
53class MDNode;
54class Use;

56/// This provides the default implementation of the IRBuilder
57/// 'InsertHelper' method that is called whenever an instruction is created by
58/// IRBuilder and needs to be inserted.
59///
60/// By default, this inserts the instruction at the insertion point.
61class IRBuilderDefaultInserter {
62protected:
void InsertHelper(Instruction *I, const Twine &Name,
                  BasicBlock *BB, BasicBlock::iterator InsertPt) const {
  if (BB) BB->getInstList().insert(InsertPt, I);
  I->setName(Name);
}
68};

70/// Provides an 'InsertHelper' that calls a user-provided callback after
71/// performing the default insertion.
72class IRBuilderCallbackInserter : IRBuilderDefaultInserter {
std::function<void(Instruction *)> Callback;

75public:
IRBuilderCallbackInserter(std::function<void(Instruction *)> Callback)
    : Callback(std::move(Callback)) {}

79protected:
void InsertHelper(Instruction *I, const Twine &Name,
                  BasicBlock *BB, BasicBlock::iterator InsertPt) const {
  IRBuilderDefaultInserter::InsertHelper(I, Name, BB, InsertPt);
  Callback(I);
}
85};

87/// Common base class shared among various IRBuilders.
88class IRBuilderBase {
DebugLoc CurDbgLocation;

91protected:
BasicBlock *BB;
BasicBlock::iterator InsertPt;
LLVMContext &Context;

MDNode *DefaultFPMathTag;
FastMathFlags FMF;

bool IsFPConstrained;
ConstrainedFPIntrinsic::ExceptionBehavior DefaultConstrainedExcept;
ConstrainedFPIntrinsic::RoundingMode DefaultConstrainedRounding;

ArrayRef<OperandBundleDef> DefaultOperandBundles;

105public:
IRBuilderBase(LLVMContext &context, MDNode *FPMathTag = nullptr,
              ArrayRef<OperandBundleDef> OpBundles = None)
    : Context(context), DefaultFPMathTag(FPMathTag), IsFPConstrained(false),
      DefaultConstrainedExcept(ConstrainedFPIntrinsic::ebStrict),
      DefaultConstrainedRounding(ConstrainedFPIntrinsic::rmDynamic),
      DefaultOperandBundles(OpBundles) {
  ClearInsertionPoint();
}

//===--------------------------------------------------------------------===//
// Builder configuration methods
//===--------------------------------------------------------------------===//

/// Clear the insertion point: created instructions will not be
/// inserted into a block.
void ClearInsertionPoint() {
  BB = nullptr;
  InsertPt = BasicBlock::iterator();
}

BasicBlock *GetInsertBlock() const { return BB; }
BasicBlock::iterator GetInsertPoint() const { return InsertPt; }
LLVMContext &getContext() const { return Context; }

/// This specifies that created instructions should be appended to the
/// end of the specified block.
void SetInsertPoint(BasicBlock *TheBB) {
  BB = TheBB;
  InsertPt = BB->end();
}

/// This specifies that created instructions should be inserted before
/// the specified instruction.
void SetInsertPoint(Instruction *I) {
  BB = I->getParent();
  InsertPt = I->getIterator();
  assert(InsertPt != BB->end() && "Can't read debug loc from end()")((InsertPt != BB->end() && "Can't read debug loc from end()"
) ? static_cast<void> (0) : __assert_fail ("InsertPt != BB->end() && \"Can't read debug loc from end()\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 142, __PRETTY_FUNCTION__));
  SetCurrentDebugLocation(I->getDebugLoc());
}

/// This specifies that created instructions should be inserted at the
/// specified point.
void SetInsertPoint(BasicBlock *TheBB, BasicBlock::iterator IP) {
  BB = TheBB;
  InsertPt = IP;
  if (IP != TheBB->end())
    SetCurrentDebugLocation(IP->getDebugLoc());
}

/// Set location information used by debugging information.
void SetCurrentDebugLocation(DebugLoc L) { CurDbgLocation = std::move(L); }

/// Get location information used by debugging information.
const DebugLoc &getCurrentDebugLocation() const { return CurDbgLocation; }

/// If this builder has a current debug location, set it on the
/// specified instruction.
void SetInstDebugLocation(Instruction *I) const {
  if (CurDbgLocation)
    I->setDebugLoc(CurDbgLocation);
}

/// Get the return type of the current function that we're emitting
/// into.
Type *getCurrentFunctionReturnType() const;

/// InsertPoint - A saved insertion point.
class InsertPoint {
  BasicBlock *Block = nullptr;
  BasicBlock::iterator Point;

public:
  /// Creates a new insertion point which doesn't point to anything.
  InsertPoint() = default;

  /// Creates a new insertion point at the given location.
  InsertPoint(BasicBlock *InsertBlock, BasicBlock::iterator InsertPoint)
      : Block(InsertBlock), Point(InsertPoint) {}

  /// Returns true if this insert point is set.
  bool isSet() const { return (Block != nullptr); }

  BasicBlock *getBlock() const { return Block; }
  BasicBlock::iterator getPoint() const { return Point; }
};

/// Returns the current insert point.
InsertPoint saveIP() const {
  return InsertPoint(GetInsertBlock(), GetInsertPoint());
}

/// Returns the current insert point, clearing it in the process.
InsertPoint saveAndClearIP() {
  InsertPoint IP(GetInsertBlock(), GetInsertPoint());
  ClearInsertionPoint();
  return IP;
}

/// Sets the current insert point to a previously-saved location.
void restoreIP(InsertPoint IP) {
  if (IP.isSet())
    SetInsertPoint(IP.getBlock(), IP.getPoint());
  else
    ClearInsertionPoint();
}

/// Get the floating point math metadata being used.
MDNode *getDefaultFPMathTag() const { return DefaultFPMathTag; }

/// Get the flags to be applied to created floating point ops
FastMathFlags getFastMathFlags() const { return FMF; }

/// Clear the fast-math flags.
void clearFastMathFlags() { FMF.clear(); }

/// Set the floating point math metadata to be used.
void setDefaultFPMathTag(MDNode *FPMathTag) { DefaultFPMathTag = FPMathTag; }

/// Set the fast-math flags to be used with generated fp-math operators
void setFastMathFlags(FastMathFlags NewFMF) { FMF = NewFMF; }

/// Enable/Disable use of constrained floating point math. When
/// enabled the CreateF<op>() calls instead create constrained
/// floating point intrinsic calls. Fast math flags are unaffected
/// by this setting.
void setIsFPConstrained(bool IsCon) { IsFPConstrained = IsCon; }

/// Query for the use of constrained floating point math
bool getIsFPConstrained() { return IsFPConstrained; }

/// Set the exception handling to be used with constrained floating point
void setDefaultConstrainedExcept(
    ConstrainedFPIntrinsic::ExceptionBehavior NewExcept) {
  DefaultConstrainedExcept = NewExcept;
}

/// Set the rounding mode handling to be used with constrained floating point
void setDefaultConstrainedRounding(
    ConstrainedFPIntrinsic::RoundingMode NewRounding) {
  DefaultConstrainedRounding = NewRounding;
}

/// Get the exception handling used with constrained floating point
ConstrainedFPIntrinsic::ExceptionBehavior getDefaultConstrainedExcept() {
  return DefaultConstrainedExcept;
}

/// Get the rounding mode handling used with constrained floating point
ConstrainedFPIntrinsic::RoundingMode getDefaultConstrainedRounding() {
  return DefaultConstrainedRounding;
}

void setConstrainedFPFunctionAttr() {
  assert(BB && "Must have a basic block to set any function attributes!")((BB && "Must have a basic block to set any function attributes!"
) ? static_cast<void> (0) : __assert_fail ("BB && \"Must have a basic block to set any function attributes!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 259, __PRETTY_FUNCTION__));

  Function *F = BB->getParent();
  if (!F->hasFnAttribute(Attribute::StrictFP)) {
    F->addFnAttr(Attribute::StrictFP);
  }
}

void setConstrainedFPCallAttr(CallInst *I) {
  if (!I->hasFnAttr(Attribute::StrictFP))
    I->addAttribute(AttributeList::FunctionIndex, Attribute::StrictFP);
  setConstrainedFPFunctionAttr();
}

//===--------------------------------------------------------------------===//
// RAII helpers.
//===--------------------------------------------------------------------===//

// RAII object that stores the current insertion point and restores it
// when the object is destroyed. This includes the debug location.
class InsertPointGuard {
  IRBuilderBase &Builder;
  AssertingVH<BasicBlock> Block;
  BasicBlock::iterator Point;
  DebugLoc DbgLoc;

public:
  InsertPointGuard(IRBuilderBase &B)
      : Builder(B), Block(B.GetInsertBlock()), Point(B.GetInsertPoint()),
        DbgLoc(B.getCurrentDebugLocation()) {}

  InsertPointGuard(const InsertPointGuard &) = delete;
  InsertPointGuard &operator=(const InsertPointGuard &) = delete;

  ~InsertPointGuard() {
    Builder.restoreIP(InsertPoint(Block, Point));
    Builder.SetCurrentDebugLocation(DbgLoc);
  }
};

// RAII object that stores the current fast math settings and restores
// them when the object is destroyed.
class FastMathFlagGuard {
  IRBuilderBase &Builder;
  FastMathFlags FMF;
  MDNode *FPMathTag;

public:
  FastMathFlagGuard(IRBuilderBase &B)
      : Builder(B), FMF(B.FMF), FPMathTag(B.DefaultFPMathTag) {}

  FastMathFlagGuard(const FastMathFlagGuard &) = delete;
  FastMathFlagGuard &operator=(const FastMathFlagGuard &) = delete;

  ~FastMathFlagGuard() {
    Builder.FMF = FMF;
    Builder.DefaultFPMathTag = FPMathTag;
  }
};

//===--------------------------------------------------------------------===//
// Miscellaneous creation methods.
//===--------------------------------------------------------------------===//

/// Make a new global variable with initializer type i8*
///
/// Make a new global variable with an initializer that has array of i8 type
/// filled in with the null terminated string value specified.  The new global
/// variable will be marked mergable with any others of the same contents.  If
/// Name is specified, it is the name of the global variable created.
GlobalVariable *CreateGlobalString(StringRef Str, const Twine &Name = "",
                                   unsigned AddressSpace = 0);

/// Get a constant value representing either true or false.
ConstantInt *getInt1(bool V) {
  return ConstantInt::get(getInt1Ty(), V);
}

/// Get the constant value for i1 true.
ConstantInt *getTrue() {
  return ConstantInt::getTrue(Context);
}

/// Get the constant value for i1 false.
ConstantInt *getFalse() {
  return ConstantInt::getFalse(Context);
}

/// Get a constant 8-bit value.
ConstantInt *getInt8(uint8_t C) {
  return ConstantInt::get(getInt8Ty(), C);
}

/// Get a constant 16-bit value.
ConstantInt *getInt16(uint16_t C) {
  return ConstantInt::get(getInt16Ty(), C);
}

/// Get a constant 32-bit value.
ConstantInt *getInt32(uint32_t C) {
  return ConstantInt::get(getInt32Ty(), C);
}

/// Get a constant 64-bit value.
ConstantInt *getInt64(uint64_t C) {
  return ConstantInt::get(getInt64Ty(), C);
}

/// Get a constant N-bit value, zero extended or truncated from
/// a 64-bit value.
ConstantInt *getIntN(unsigned N, uint64_t C) {
  return ConstantInt::get(getIntNTy(N), C);
}

/// Get a constant integer value.
ConstantInt *getInt(const APInt &AI) {
  return ConstantInt::get(Context, AI);
}

//===--------------------------------------------------------------------===//
// Type creation methods
//===--------------------------------------------------------------------===//

/// Fetch the type representing a single bit
IntegerType *getInt1Ty() {
  return Type::getInt1Ty(Context);
}

/// Fetch the type representing an 8-bit integer.
IntegerType *getInt8Ty() {
  return Type::getInt8Ty(Context);
}

/// Fetch the type representing a 16-bit integer.
IntegerType *getInt16Ty() {
  return Type::getInt16Ty(Context);
}

/// Fetch the type representing a 32-bit integer.
IntegerType *getInt32Ty() {
  return Type::getInt32Ty(Context);
}

/// Fetch the type representing a 64-bit integer.
IntegerType *getInt64Ty() {
  return Type::getInt64Ty(Context);
}

/// Fetch the type representing a 128-bit integer.
IntegerType *getInt128Ty() { return Type::getInt128Ty(Context); }

/// Fetch the type representing an N-bit integer.
IntegerType *getIntNTy(unsigned N) {
  return Type::getIntNTy(Context, N);
}

/// Fetch the type representing a 16-bit floating point value.
Type *getHalfTy() {
  return Type::getHalfTy(Context);
}

/// Fetch the type representing a 32-bit floating point value.
Type *getFloatTy() {
  return Type::getFloatTy(Context);
}

/// Fetch the type representing a 64-bit floating point value.
Type *getDoubleTy() {
  return Type::getDoubleTy(Context);
}

/// Fetch the type representing void.
Type *getVoidTy() {
  return Type::getVoidTy(Context);
}

/// Fetch the type representing a pointer to an 8-bit integer value.
PointerType *getInt8PtrTy(unsigned AddrSpace = 0) {
  return Type::getInt8PtrTy(Context, AddrSpace);
}

/// Fetch the type representing a pointer to an integer value.
IntegerType *getIntPtrTy(const DataLayout &DL, unsigned AddrSpace = 0) {
  return DL.getIntPtrType(Context, AddrSpace);
}

//===--------------------------------------------------------------------===//
// Intrinsic creation methods
//===--------------------------------------------------------------------===//

/// Create and insert a memset to the specified pointer and the
/// specified value.
///
/// If the pointer isn't an i8*, it will be converted. If a TBAA tag is
/// specified, it will be added to the instruction. Likewise with alias.scope
/// and noalias tags.
CallInst *CreateMemSet(Value *Ptr, Value *Val, uint64_t Size, unsigned Align,
                       bool isVolatile = false, MDNode *TBAATag = nullptr,
                       MDNode *ScopeTag = nullptr,
                       MDNode *NoAliasTag = nullptr) {
  return CreateMemSet(Ptr, Val, getInt64(Size), Align, isVolatile,
                      TBAATag, ScopeTag, NoAliasTag);
}

CallInst *CreateMemSet(Value *Ptr, Value *Val, Value *Size, unsigned Align,
                       bool isVolatile = false, MDNode *TBAATag = nullptr,
                       MDNode *ScopeTag = nullptr,
                       MDNode *NoAliasTag = nullptr);

/// Create and insert an element unordered-atomic memset of the region of
/// memory starting at the given pointer to the given value.
///
/// If the pointer isn't an i8*, it will be converted. If a TBAA tag is
/// specified, it will be added to the instruction. Likewise with alias.scope
/// and noalias tags.
CallInst *CreateElementUnorderedAtomicMemSet(Value *Ptr, Value *Val,
                                             uint64_t Size, unsigned Align,
                                             uint32_t ElementSize,
                                             MDNode *TBAATag = nullptr,
                                             MDNode *ScopeTag = nullptr,
                                             MDNode *NoAliasTag = nullptr) {
  return CreateElementUnorderedAtomicMemSet(Ptr, Val, getInt64(Size), Align,
                                            ElementSize, TBAATag, ScopeTag,
                                            NoAliasTag);
}

CallInst *CreateElementUnorderedAtomicMemSet(Value *Ptr, Value *Val,
                                             Value *Size, unsigned Align,
                                             uint32_t ElementSize,
                                             MDNode *TBAATag = nullptr,
                                             MDNode *ScopeTag = nullptr,
                                             MDNode *NoAliasTag = nullptr);

/// Create and insert a memcpy between the specified pointers.
///
/// If the pointers aren't i8*, they will be converted.  If a TBAA tag is
/// specified, it will be added to the instruction. Likewise with alias.scope
/// and noalias tags.
CallInst *CreateMemCpy(Value *Dst, unsigned DstAlign, Value *Src,
                       unsigned SrcAlign, uint64_t Size,
                       bool isVolatile = false, MDNode *TBAATag = nullptr,
                       MDNode *TBAAStructTag = nullptr,
                       MDNode *ScopeTag = nullptr,
                       MDNode *NoAliasTag = nullptr) {
  return CreateMemCpy(Dst, DstAlign, Src, SrcAlign, getInt64(Size),
                      isVolatile, TBAATag, TBAAStructTag, ScopeTag,
                      NoAliasTag);
}

CallInst *CreateMemCpy(Value *Dst, unsigned DstAlign, Value *Src,
                       unsigned SrcAlign, Value *Size,
                       bool isVolatile = false, MDNode *TBAATag = nullptr,
                       MDNode *TBAAStructTag = nullptr,
                       MDNode *ScopeTag = nullptr,
                       MDNode *NoAliasTag = nullptr);

/// Create and insert an element unordered-atomic memcpy between the
/// specified pointers.
///
/// DstAlign/SrcAlign are the alignments of the Dst/Src pointers, respectively.
///
/// If the pointers aren't i8*, they will be converted.  If a TBAA tag is
/// specified, it will be added to the instruction. Likewise with alias.scope
/// and noalias tags.
CallInst *CreateElementUnorderedAtomicMemCpy(
    Value *Dst, unsigned DstAlign, Value *Src, unsigned SrcAlign,
    uint64_t Size, uint32_t ElementSize, MDNode *TBAATag = nullptr,
    MDNode *TBAAStructTag = nullptr, MDNode *ScopeTag = nullptr,
    MDNode *NoAliasTag = nullptr) {
  return CreateElementUnorderedAtomicMemCpy(
      Dst, DstAlign, Src, SrcAlign, getInt64(Size), ElementSize, TBAATag,
      TBAAStructTag, ScopeTag, NoAliasTag);
}

CallInst *CreateElementUnorderedAtomicMemCpy(
    Value *Dst, unsigned DstAlign, Value *Src, unsigned SrcAlign, Value *Size,
    uint32_t ElementSize, MDNode *TBAATag = nullptr,
    MDNode *TBAAStructTag = nullptr, MDNode *ScopeTag = nullptr,
    MDNode *NoAliasTag = nullptr);

/// Create and insert a memmove between the specified
/// pointers.
///
/// If the pointers aren't i8*, they will be converted.  If a TBAA tag is
/// specified, it will be added to the instruction. Likewise with alias.scope
/// and noalias tags.
CallInst *CreateMemMove(Value *Dst, unsigned DstAlign, Value *Src, unsigned SrcAlign,
                        uint64_t Size, bool isVolatile = false,
                        MDNode *TBAATag = nullptr, MDNode *ScopeTag = nullptr,
                        MDNode *NoAliasTag = nullptr) {
  return CreateMemMove(Dst, DstAlign, Src, SrcAlign, getInt64(Size), isVolatile,
                       TBAATag, ScopeTag, NoAliasTag);
}

CallInst *CreateMemMove(Value *Dst, unsigned DstAlign, Value *Src, unsigned SrcAlign,
                        Value *Size, bool isVolatile = false, MDNode *TBAATag = nullptr,
                        MDNode *ScopeTag = nullptr,
                        MDNode *NoAliasTag = nullptr);

/// \brief Create and insert an element unordered-atomic memmove between the
/// specified pointers.
///
/// DstAlign/SrcAlign are the alignments of the Dst/Src pointers,
/// respectively.
///
/// If the pointers aren't i8*, they will be converted.  If a TBAA tag is
/// specified, it will be added to the instruction. Likewise with alias.scope
/// and noalias tags.
CallInst *CreateElementUnorderedAtomicMemMove(
    Value *Dst, unsigned DstAlign, Value *Src, unsigned SrcAlign,
    uint64_t Size, uint32_t ElementSize, MDNode *TBAATag = nullptr,
    MDNode *TBAAStructTag = nullptr, MDNode *ScopeTag = nullptr,
    MDNode *NoAliasTag = nullptr) {
  return CreateElementUnorderedAtomicMemMove(
      Dst, DstAlign, Src, SrcAlign, getInt64(Size), ElementSize, TBAATag,
      TBAAStructTag, ScopeTag, NoAliasTag);
}

CallInst *CreateElementUnorderedAtomicMemMove(
    Value *Dst, unsigned DstAlign, Value *Src, unsigned SrcAlign, Value *Size,
    uint32_t ElementSize, MDNode *TBAATag = nullptr,
    MDNode *TBAAStructTag = nullptr, MDNode *ScopeTag = nullptr,
    MDNode *NoAliasTag = nullptr);

/// Create a vector fadd reduction intrinsic of the source vector.
/// The first parameter is a scalar accumulator value for ordered reductions.
CallInst *CreateFAddReduce(Value *Acc, Value *Src);

/// Create a vector fmul reduction intrinsic of the source vector.
/// The first parameter is a scalar accumulator value for ordered reductions.
CallInst *CreateFMulReduce(Value *Acc, Value *Src);

/// Create a vector int add reduction intrinsic of the source vector.
CallInst *CreateAddReduce(Value *Src);

/// Create a vector int mul reduction intrinsic of the source vector.
CallInst *CreateMulReduce(Value *Src);

/// Create a vector int AND reduction intrinsic of the source vector.
CallInst *CreateAndReduce(Value *Src);

/// Create a vector int OR reduction intrinsic of the source vector.
CallInst *CreateOrReduce(Value *Src);

/// Create a vector int XOR reduction intrinsic of the source vector.
CallInst *CreateXorReduce(Value *Src);

/// Create a vector integer max reduction intrinsic of the source
/// vector.
CallInst *CreateIntMaxReduce(Value *Src, bool IsSigned = false);

/// Create a vector integer min reduction intrinsic of the source
/// vector.
CallInst *CreateIntMinReduce(Value *Src, bool IsSigned = false);

/// Create a vector float max reduction intrinsic of the source
/// vector.
CallInst *CreateFPMaxReduce(Value *Src, bool NoNaN = false);

/// Create a vector float min reduction intrinsic of the source
/// vector.
CallInst *CreateFPMinReduce(Value *Src, bool NoNaN = false);

/// Create a lifetime.start intrinsic.
///
/// If the pointer isn't i8* it will be converted.
CallInst *CreateLifetimeStart(Value *Ptr, ConstantInt *Size = nullptr);

/// Create a lifetime.end intrinsic.
///
/// If the pointer isn't i8* it will be converted.
CallInst *CreateLifetimeEnd(Value *Ptr, ConstantInt *Size = nullptr);

/// Create a call to invariant.start intrinsic.
///
/// If the pointer isn't i8* it will be converted.
CallInst *CreateInvariantStart(Value *Ptr, ConstantInt *Size = nullptr);

/// Create a call to Masked Load intrinsic
CallInst *CreateMaskedLoad(Value *Ptr, unsigned Align, Value *Mask,
                           Value *PassThru = nullptr, const Twine &Name = "");

/// Create a call to Masked Store intrinsic
CallInst *CreateMaskedStore(Value *Val, Value *Ptr, unsigned Align,
                            Value *Mask);

/// Create a call to Masked Gather intrinsic
CallInst *CreateMaskedGather(Value *Ptrs, unsigned Align,
                             Value *Mask = nullptr,
                             Value *PassThru = nullptr,
                             const Twine& Name = "");

/// Create a call to Masked Scatter intrinsic
CallInst *CreateMaskedScatter(Value *Val, Value *Ptrs, unsigned Align,
                              Value *Mask = nullptr);

/// Create an assume intrinsic call that allows the optimizer to
/// assume that the provided condition will be true.
CallInst *CreateAssumption(Value *Cond);

/// Create a call to the experimental.gc.statepoint intrinsic to
/// start a new statepoint sequence.
CallInst *CreateGCStatepointCall(uint64_t ID, uint32_t NumPatchBytes,
                                 Value *ActualCallee,
                                 ArrayRef<Value *> CallArgs,
                                 ArrayRef<Value *> DeoptArgs,
                                 ArrayRef<Value *> GCArgs,
                                 const Twine &Name = "");

/// Create a call to the experimental.gc.statepoint intrinsic to
/// start a new statepoint sequence.
CallInst *CreateGCStatepointCall(uint64_t ID, uint32_t NumPatchBytes,
                                 Value *ActualCallee, uint32_t Flags,
                                 ArrayRef<Use> CallArgs,
                                 ArrayRef<Use> TransitionArgs,
                                 ArrayRef<Use> DeoptArgs,
                                 ArrayRef<Value *> GCArgs,
                                 const Twine &Name = "");

/// Conveninence function for the common case when CallArgs are filled
/// in using makeArrayRef(CS.arg_begin(), CS.arg_end()); Use needs to be
/// .get()'ed to get the Value pointer.
CallInst *CreateGCStatepointCall(uint64_t ID, uint32_t NumPatchBytes,
                                 Value *ActualCallee, ArrayRef<Use> CallArgs,
                                 ArrayRef<Value *> DeoptArgs,
                                 ArrayRef<Value *> GCArgs,
                                 const Twine &Name = "");

/// Create an invoke to the experimental.gc.statepoint intrinsic to
/// start a new statepoint sequence.
InvokeInst *
CreateGCStatepointInvoke(uint64_t ID, uint32_t NumPatchBytes,
                         Value *ActualInvokee, BasicBlock *NormalDest,
                         BasicBlock *UnwindDest, ArrayRef<Value *> InvokeArgs,
                         ArrayRef<Value *> DeoptArgs,
                         ArrayRef<Value *> GCArgs, const Twine &Name = "");

/// Create an invoke to the experimental.gc.statepoint intrinsic to
/// start a new statepoint sequence.
InvokeInst *CreateGCStatepointInvoke(
    uint64_t ID, uint32_t NumPatchBytes, Value *ActualInvokee,
    BasicBlock *NormalDest, BasicBlock *UnwindDest, uint32_t Flags,
    ArrayRef<Use> InvokeArgs, ArrayRef<Use> TransitionArgs,
    ArrayRef<Use> DeoptArgs, ArrayRef<Value *> GCArgs,
    const Twine &Name = "");

// Convenience function for the common case when CallArgs are filled in using
// makeArrayRef(CS.arg_begin(), CS.arg_end()); Use needs to be .get()'ed to
// get the Value *.
InvokeInst *
CreateGCStatepointInvoke(uint64_t ID, uint32_t NumPatchBytes,
                         Value *ActualInvokee, BasicBlock *NormalDest,
                         BasicBlock *UnwindDest, ArrayRef<Use> InvokeArgs,
                         ArrayRef<Value *> DeoptArgs,
                         ArrayRef<Value *> GCArgs, const Twine &Name = "");

/// Create a call to the experimental.gc.result intrinsic to extract
/// the result from a call wrapped in a statepoint.
CallInst *CreateGCResult(Instruction *Statepoint,
                         Type *ResultType,
                         const Twine &Name = "");

/// Create a call to the experimental.gc.relocate intrinsics to
/// project the relocated value of one pointer from the statepoint.
CallInst *CreateGCRelocate(Instruction *Statepoint,
                           int BaseOffset,
                           int DerivedOffset,
                           Type *ResultType,
                           const Twine &Name = "");

/// Create a call to intrinsic \p ID with 1 operand which is mangled on its
/// type.
CallInst *CreateUnaryIntrinsic(Intrinsic::ID ID, Value *V,
                               Instruction *FMFSource = nullptr,
                               const Twine &Name = "");

/// Create a call to intrinsic \p ID with 2 operands which is mangled on the
/// first type.
CallInst *CreateBinaryIntrinsic(Intrinsic::ID ID, Value *LHS, Value *RHS,
                                Instruction *FMFSource = nullptr,
                                const Twine &Name = "");

/// Create a call to intrinsic \p ID with \p args, mangled using \p Types. If
/// \p FMFSource is provided, copy fast-math-flags from that instruction to
/// the intrinsic.
CallInst *CreateIntrinsic(Intrinsic::ID ID, ArrayRef<Type *> Types,
                          ArrayRef<Value *> Args,
                          Instruction *FMFSource = nullptr,
                          const Twine &Name = "");

/// Create call to the minnum intrinsic.
CallInst *CreateMinNum(Value *LHS, Value *RHS, const Twine &Name = "") {
  return CreateBinaryIntrinsic(Intrinsic::minnum, LHS, RHS, nullptr, Name);
}

/// Create call to the maxnum intrinsic.
CallInst *CreateMaxNum(Value *LHS, Value *RHS, const Twine &Name = "") {
  return CreateBinaryIntrinsic(Intrinsic::maxnum, LHS, RHS, nullptr, Name);
}

/// Create call to the minimum intrinsic.
CallInst *CreateMinimum(Value *LHS, Value *RHS, const Twine &Name = "") {
  return CreateBinaryIntrinsic(Intrinsic::minimum, LHS, RHS, nullptr, Name);
}

/// Create call to the maximum intrinsic.
CallInst *CreateMaximum(Value *LHS, Value *RHS, const Twine &Name = "") {
  return CreateBinaryIntrinsic(Intrinsic::maximum, LHS, RHS, nullptr, Name);
}

769private:
/// Create a call to a masked intrinsic with given Id.
CallInst *CreateMaskedIntrinsic(Intrinsic::ID Id, ArrayRef<Value *> Ops,
                                ArrayRef<Type *> OverloadedTypes,
                                const Twine &Name = "");

Value *getCastedInt8PtrValue(Value *Ptr);
776};

778/// This provides a uniform API for creating instructions and inserting
779/// them into a basic block: either at the end of a BasicBlock, or at a specific
780/// iterator location in a block.
781///
782/// Note that the builder does not expose the full generality of LLVM
783/// instructions.  For access to extra instruction properties, use the mutators
784/// (e.g. setVolatile) on the instructions after they have been
785/// created. Convenience state exists to specify fast-math flags and fp-math
786/// tags.
787///
788/// The first template argument specifies a class to use for creating constants.
789/// This defaults to creating minimally folded constants.  The second template
790/// argument allows clients to specify custom insertion hooks that are called on
791/// every newly created insertion.
792template <typename T = ConstantFolder,
        typename Inserter = IRBuilderDefaultInserter>
794class IRBuilder : public IRBuilderBase, public Inserter {
T Folder;

797public:
IRBuilder(LLVMContext &C, const T &F, Inserter I = Inserter(),
          MDNode *FPMathTag = nullptr,
          ArrayRef<OperandBundleDef> OpBundles = None)
    : IRBuilderBase(C, FPMathTag, OpBundles), Inserter(std::move(I)),
      Folder(F) {}

explicit IRBuilder(LLVMContext &C, MDNode *FPMathTag = nullptr,
                   ArrayRef<OperandBundleDef> OpBundles = None)
    : IRBuilderBase(C, FPMathTag, OpBundles) {}

explicit IRBuilder(BasicBlock *TheBB, const T &F, MDNode *FPMathTag = nullptr,
                   ArrayRef<OperandBundleDef> OpBundles = None)
    : IRBuilderBase(TheBB->getContext(), FPMathTag, OpBundles), Folder(F) {
  SetInsertPoint(TheBB);
}

explicit IRBuilder(BasicBlock *TheBB, MDNode *FPMathTag = nullptr,
                   ArrayRef<OperandBundleDef> OpBundles = None)
    : IRBuilderBase(TheBB->getContext(), FPMathTag, OpBundles) {
  SetInsertPoint(TheBB);
}

explicit IRBuilder(Instruction *IP, MDNode *FPMathTag = nullptr,
                   ArrayRef<OperandBundleDef> OpBundles = None)
    : IRBuilderBase(IP->getContext(), FPMathTag, OpBundles) {
  SetInsertPoint(IP);
}

IRBuilder(BasicBlock *TheBB, BasicBlock::iterator IP, const T &F,
          MDNode *FPMathTag = nullptr,
          ArrayRef<OperandBundleDef> OpBundles = None)
    : IRBuilderBase(TheBB->getContext(), FPMathTag, OpBundles), Folder(F) {
  SetInsertPoint(TheBB, IP);
}

IRBuilder(BasicBlock *TheBB, BasicBlock::iterator IP,
          MDNode *FPMathTag = nullptr,
          ArrayRef<OperandBundleDef> OpBundles = None)
    : IRBuilderBase(TheBB->getContext(), FPMathTag, OpBundles) {
  SetInsertPoint(TheBB, IP);
}

/// Get the constant folder being used.
const T &getFolder() { return Folder; }

/// Insert and return the specified instruction.
template<typename InstTy>
InstTy *Insert(InstTy *I, const Twine &Name = "") const {
  this->InsertHelper(I, Name, BB, InsertPt);
43
←
Calling 'IRBuilderPrefixedInserter::InsertHelper'→
51
←
Returning from 'IRBuilderPrefixedInserter::InsertHelper'→
  this->SetInstDebugLocation(I);
  return I;
}

/// No-op overload to handle constants.
Constant *Insert(Constant *C, const Twine& = "") const {
  return C;
}

//===--------------------------------------------------------------------===//
// Instruction creation methods: Terminators
//===--------------------------------------------------------------------===//

860private:
/// Helper to add branch weight and unpredictable metadata onto an
/// instruction.
/// \returns The annotated instruction.
template <typename InstTy>
InstTy *addBranchMetadata(InstTy *I, MDNode *Weights, MDNode *Unpredictable) {
  if (Weights)
    I->setMetadata(LLVMContext::MD_prof, Weights);
  if (Unpredictable)
    I->setMetadata(LLVMContext::MD_unpredictable, Unpredictable);
  return I;
}

873public:
/// Create a 'ret void' instruction.
ReturnInst *CreateRetVoid() {
  return Insert(ReturnInst::Create(Context));
}

/// Create a 'ret <val>' instruction.
ReturnInst *CreateRet(Value *V) {
  return Insert(ReturnInst::Create(Context, V));
}

/// Create a sequence of N insertvalue instructions,
/// with one Value from the retVals array each, that build a aggregate
/// return value one value at a time, and a ret instruction to return
/// the resulting aggregate value.
///
/// This is a convenience function for code that uses aggregate return values
/// as a vehicle for having multiple return values.
ReturnInst *CreateAggregateRet(Value *const *retVals, unsigned N) {
  Value *V = UndefValue::get(getCurrentFunctionReturnType());
  for (unsigned i = 0; i != N; ++i)
    V = CreateInsertValue(V, retVals[i], i, "mrv");
  return Insert(ReturnInst::Create(Context, V));
}

/// Create an unconditional 'br label X' instruction.
BranchInst *CreateBr(BasicBlock *Dest) {
  return Insert(BranchInst::Create(Dest));
}

/// Create a conditional 'br Cond, TrueDest, FalseDest'
/// instruction.
BranchInst *CreateCondBr(Value *Cond, BasicBlock *True, BasicBlock *False,
                         MDNode *BranchWeights = nullptr,
                         MDNode *Unpredictable = nullptr) {
  return Insert(addBranchMetadata(BranchInst::Create(True, False, Cond),
                                  BranchWeights, Unpredictable));
}

/// Create a conditional 'br Cond, TrueDest, FalseDest'
/// instruction. Copy branch meta data if available.
BranchInst *CreateCondBr(Value *Cond, BasicBlock *True, BasicBlock *False,
                         Instruction *MDSrc) {
  BranchInst *Br = BranchInst::Create(True, False, Cond);
  if (MDSrc) {
    unsigned WL[4] = {LLVMContext::MD_prof, LLVMContext::MD_unpredictable,
                      LLVMContext::MD_make_implicit, LLVMContext::MD_dbg};
    Br->copyMetadata(*MDSrc, makeArrayRef(&WL[0], 4));
  }
  return Insert(Br);
}

/// Create a switch instruction with the specified value, default dest,
/// and with a hint for the number of cases that will be added (for efficient
/// allocation).
SwitchInst *CreateSwitch(Value *V, BasicBlock *Dest, unsigned NumCases = 10,
                         MDNode *BranchWeights = nullptr,
                         MDNode *Unpredictable = nullptr) {
  return Insert(addBranchMetadata(SwitchInst::Create(V, Dest, NumCases),
                                  BranchWeights, Unpredictable));
}

/// Create an indirect branch instruction with the specified address
/// operand, with an optional hint for the number of destinations that will be
/// added (for efficient allocation).
IndirectBrInst *CreateIndirectBr(Value *Addr, unsigned NumDests = 10) {
  return Insert(IndirectBrInst::Create(Addr, NumDests));
}

/// Create an invoke instruction.
InvokeInst *CreateInvoke(FunctionType *Ty, Value *Callee,
                         BasicBlock *NormalDest, BasicBlock *UnwindDest,
                         ArrayRef<Value *> Args,
                         ArrayRef<OperandBundleDef> OpBundles,
                         const Twine &Name = "") {
  return Insert(
      InvokeInst::Create(Ty, Callee, NormalDest, UnwindDest, Args, OpBundles),
      Name);
}
InvokeInst *CreateInvoke(FunctionType *Ty, Value *Callee,
                         BasicBlock *NormalDest, BasicBlock *UnwindDest,
                         ArrayRef<Value *> Args = None,
                         const Twine &Name = "") {
  return Insert(InvokeInst::Create(Ty, Callee, NormalDest, UnwindDest, Args),
                Name);
}

InvokeInst *CreateInvoke(FunctionCallee Callee, BasicBlock *NormalDest,
                         BasicBlock *UnwindDest, ArrayRef<Value *> Args,
                         ArrayRef<OperandBundleDef> OpBundles,
                         const Twine &Name = "") {
  return CreateInvoke(Callee.getFunctionType(), Callee.getCallee(),
                      NormalDest, UnwindDest, Args, OpBundles, Name);
}

InvokeInst *CreateInvoke(FunctionCallee Callee, BasicBlock *NormalDest,
                         BasicBlock *UnwindDest,
                         ArrayRef<Value *> Args = None,
                         const Twine &Name = "") {
  return CreateInvoke(Callee.getFunctionType(), Callee.getCallee(),
                      NormalDest, UnwindDest, Args, Name);
}

// Deprecated [opaque pointer types]
InvokeInst *CreateInvoke(Value *Callee, BasicBlock *NormalDest,
                         BasicBlock *UnwindDest, ArrayRef<Value *> Args,
                         ArrayRef<OperandBundleDef> OpBundles,
                         const Twine &Name = "") {
  return CreateInvoke(
      cast<FunctionType>(
          cast<PointerType>(Callee->getType())->getElementType()),
      Callee, NormalDest, UnwindDest, Args, OpBundles, Name);
}

// Deprecated [opaque pointer types]
InvokeInst *CreateInvoke(Value *Callee, BasicBlock *NormalDest,
                         BasicBlock *UnwindDest,
                         ArrayRef<Value *> Args = None,
                         const Twine &Name = "") {
  return CreateInvoke(
      cast<FunctionType>(
          cast<PointerType>(Callee->getType())->getElementType()),
      Callee, NormalDest, UnwindDest, Args, Name);
}

/// \brief Create a callbr instruction.
CallBrInst *CreateCallBr(FunctionType *Ty, Value *Callee,
                         BasicBlock *DefaultDest,
                         ArrayRef<BasicBlock *> IndirectDests,
                         ArrayRef<Value *> Args = None,
                         const Twine &Name = "") {
  return Insert(CallBrInst::Create(Ty, Callee, DefaultDest, IndirectDests,
                                   Args), Name);
}
CallBrInst *CreateCallBr(FunctionType *Ty, Value *Callee,
                         BasicBlock *DefaultDest,
                         ArrayRef<BasicBlock *> IndirectDests,
                         ArrayRef<Value *> Args,
                         ArrayRef<OperandBundleDef> OpBundles,
                         const Twine &Name = "") {
  return Insert(
      CallBrInst::Create(Ty, Callee, DefaultDest, IndirectDests, Args,
                         OpBundles), Name);
}

CallBrInst *CreateCallBr(FunctionCallee Callee, BasicBlock *DefaultDest,
                         ArrayRef<BasicBlock *> IndirectDests,
                         ArrayRef<Value *> Args = None,
                         const Twine &Name = "") {
  return CreateCallBr(Callee.getFunctionType(), Callee.getCallee(),
                      DefaultDest, IndirectDests, Args, Name);
}
CallBrInst *CreateCallBr(FunctionCallee Callee, BasicBlock *DefaultDest,
                         ArrayRef<BasicBlock *> IndirectDests,
                         ArrayRef<Value *> Args,
                         ArrayRef<OperandBundleDef> OpBundles,
                         const Twine &Name = "") {
  return CreateCallBr(Callee.getFunctionType(), Callee.getCallee(),
                      DefaultDest, IndirectDests, Args, Name);
}

ResumeInst *CreateResume(Value *Exn) {
  return Insert(ResumeInst::Create(Exn));
}

CleanupReturnInst *CreateCleanupRet(CleanupPadInst *CleanupPad,
                                    BasicBlock *UnwindBB = nullptr) {
  return Insert(CleanupReturnInst::Create(CleanupPad, UnwindBB));
}

CatchSwitchInst *CreateCatchSwitch(Value *ParentPad, BasicBlock *UnwindBB,
                                   unsigned NumHandlers,
                                   const Twine &Name = "") {
  return Insert(CatchSwitchInst::Create(ParentPad, UnwindBB, NumHandlers),
                Name);
}

CatchPadInst *CreateCatchPad(Value *ParentPad, ArrayRef<Value *> Args,
                             const Twine &Name = "") {
  return Insert(CatchPadInst::Create(ParentPad, Args), Name);
}

CleanupPadInst *CreateCleanupPad(Value *ParentPad,
                                 ArrayRef<Value *> Args = None,
                                 const Twine &Name = "") {
  return Insert(CleanupPadInst::Create(ParentPad, Args), Name);
}

CatchReturnInst *CreateCatchRet(CatchPadInst *CatchPad, BasicBlock *BB) {
  return Insert(CatchReturnInst::Create(CatchPad, BB));
}

UnreachableInst *CreateUnreachable() {
  return Insert(new UnreachableInst(Context));
}

//===--------------------------------------------------------------------===//
// Instruction creation methods: Binary Operators
//===--------------------------------------------------------------------===//
1072private:
BinaryOperator *CreateInsertNUWNSWBinOp(BinaryOperator::BinaryOps Opc,
                                        Value *LHS, Value *RHS,
                                        const Twine &Name,
                                        bool HasNUW, bool HasNSW) {
  BinaryOperator *BO = Insert(BinaryOperator::Create(Opc, LHS, RHS), Name);
  if (HasNUW) BO->setHasNoUnsignedWrap();
  if (HasNSW) BO->setHasNoSignedWrap();
  return BO;
}

Instruction *setFPAttrs(Instruction *I, MDNode *FPMD,
                        FastMathFlags FMF) const {
  if (!FPMD)
    FPMD = DefaultFPMathTag;
  if (FPMD)
    I->setMetadata(LLVMContext::MD_fpmath, FPMD);
  I->setFastMathFlags(FMF);
  return I;
}

Value *foldConstant(Instruction::BinaryOps Opc, Value *L,
                    Value *R, const Twine &Name) const {
  auto *LC = dyn_cast<Constant>(L);
  auto *RC = dyn_cast<Constant>(R);
  return (LC && RC) ? Insert(Folder.CreateBinOp(Opc, LC, RC), Name) : nullptr;
}

Value *getConstrainedFPRounding(
    Optional<ConstrainedFPIntrinsic::RoundingMode> Rounding) {
  ConstrainedFPIntrinsic::RoundingMode UseRounding =
      DefaultConstrainedRounding;

  if (Rounding.hasValue())
    UseRounding = Rounding.getValue();

  Optional<StringRef> RoundingStr =
      ConstrainedFPIntrinsic::RoundingModeToStr(UseRounding);
  assert(RoundingStr.hasValue() && "Garbage strict rounding mode!")((RoundingStr.hasValue() && "Garbage strict rounding mode!"
) ? static_cast<void> (0) : __assert_fail ("RoundingStr.hasValue() && \"Garbage strict rounding mode!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 1110, __PRETTY_FUNCTION__));
  auto *RoundingMDS = MDString::get(Context, RoundingStr.getValue());

  return MetadataAsValue::get(Context, RoundingMDS);
}

Value *getConstrainedFPExcept(
    Optional<ConstrainedFPIntrinsic::ExceptionBehavior> Except) {
  ConstrainedFPIntrinsic::ExceptionBehavior UseExcept =
      DefaultConstrainedExcept;

  if (Except.hasValue())
    UseExcept = Except.getValue();

  Optional<StringRef> ExceptStr =
      ConstrainedFPIntrinsic::ExceptionBehaviorToStr(UseExcept);
  assert(ExceptStr.hasValue() && "Garbage strict exception behavior!")((ExceptStr.hasValue() && "Garbage strict exception behavior!"
) ? static_cast<void> (0) : __assert_fail ("ExceptStr.hasValue() && \"Garbage strict exception behavior!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 1126, __PRETTY_FUNCTION__));
  auto *ExceptMDS = MDString::get(Context, ExceptStr.getValue());

  return MetadataAsValue::get(Context, ExceptMDS);
}

1132public:
Value *CreateAdd(Value *LHS, Value *RHS, const Twine &Name = "",
                 bool HasNUW = false, bool HasNSW = false) {
  if (auto *LC = dyn_cast<Constant>(LHS))
    if (auto *RC = dyn_cast<Constant>(RHS))
      return Insert(Folder.CreateAdd(LC, RC, HasNUW, HasNSW), Name);
  return CreateInsertNUWNSWBinOp(Instruction::Add, LHS, RHS, Name,
                                 HasNUW, HasNSW);
}

Value *CreateNSWAdd(Value *LHS, Value *RHS, const Twine &Name = "") {
  return CreateAdd(LHS, RHS, Name, false, true);
}

Value *CreateNUWAdd(Value *LHS, Value *RHS, const Twine &Name = "") {
  return CreateAdd(LHS, RHS, Name, true, false);
}

Value *CreateSub(Value *LHS, Value *RHS, const Twine &Name = "",
                 bool HasNUW = false, bool HasNSW = false) {
  if (auto *LC = dyn_cast<Constant>(LHS))
    if (auto *RC = dyn_cast<Constant>(RHS))
      return Insert(Folder.CreateSub(LC, RC, HasNUW, HasNSW), Name);
  return CreateInsertNUWNSWBinOp(Instruction::Sub, LHS, RHS, Name,
                                 HasNUW, HasNSW);
}

Value *CreateNSWSub(Value *LHS, Value *RHS, const Twine &Name = "") {
  return CreateSub(LHS, RHS, Name, false, true);
}

Value *CreateNUWSub(Value *LHS, Value *RHS, const Twine &Name = "") {
  return CreateSub(LHS, RHS, Name, true, false);
}

Value *CreateMul(Value *LHS, Value *RHS, const Twine &Name = "",
                 bool HasNUW = false, bool HasNSW = false) {
  if (auto *LC = dyn_cast<Constant>(LHS))
    if (auto *RC = dyn_cast<Constant>(RHS))
      return Insert(Folder.CreateMul(LC, RC, HasNUW, HasNSW), Name);
  return CreateInsertNUWNSWBinOp(Instruction::Mul, LHS, RHS, Name,
                                 HasNUW, HasNSW);
}

Value *CreateNSWMul(Value *LHS, Value *RHS, const Twine &Name = "") {
  return CreateMul(LHS, RHS, Name, false, true);
}

Value *CreateNUWMul(Value *LHS, Value *RHS, const Twine &Name = "") {
  return CreateMul(LHS, RHS, Name, true, false);
}

Value *CreateUDiv(Value *LHS, Value *RHS, const Twine &Name = "",
                  bool isExact = false) {
  if (auto *LC = dyn_cast<Constant>(LHS))
    if (auto *RC = dyn_cast<Constant>(RHS))
      return Insert(Folder.CreateUDiv(LC, RC, isExact), Name);
  if (!isExact)
    return Insert(BinaryOperator::CreateUDiv(LHS, RHS), Name);
  return Insert(BinaryOperator::CreateExactUDiv(LHS, RHS), Name);
}

Value *CreateExactUDiv(Value *LHS, Value *RHS, const Twine &Name = "") {
  return CreateUDiv(LHS, RHS, Name, true);
}

Value *CreateSDiv(Value *LHS, Value *RHS, const Twine &Name = "",
                  bool isExact = false) {
  if (auto *LC = dyn_cast<Constant>(LHS))
    if (auto *RC = dyn_cast<Constant>(RHS))
      return Insert(Folder.CreateSDiv(LC, RC, isExact), Name);
  if (!isExact)
    return Insert(BinaryOperator::CreateSDiv(LHS, RHS), Name);
  return Insert(BinaryOperator::CreateExactSDiv(LHS, RHS), Name);
}

Value *CreateExactSDiv(Value *LHS, Value *RHS, const Twine &Name = "") {
  return CreateSDiv(LHS, RHS, Name, true);
}

Value *CreateURem(Value *LHS, Value *RHS, const Twine &Name = "") {
  if (Value *V = foldConstant(Instruction::URem, LHS, RHS, Name)) return V;
  return Insert(BinaryOperator::CreateURem(LHS, RHS), Name);
}

Value *CreateSRem(Value *LHS, Value *RHS, const Twine &Name = "") {
  if (Value *V = foldConstant(Instruction::SRem, LHS, RHS, Name)) return V;
  return Insert(BinaryOperator::CreateSRem(LHS, RHS), Name);
}

Value *CreateShl(Value *LHS, Value *RHS, const Twine &Name = "",
                 bool HasNUW = false, bool HasNSW = false) {
  if (auto *LC = dyn_cast<Constant>(LHS))
    if (auto *RC = dyn_cast<Constant>(RHS))
      return Insert(Folder.CreateShl(LC, RC, HasNUW, HasNSW), Name);
  return CreateInsertNUWNSWBinOp(Instruction::Shl, LHS, RHS, Name,
                                 HasNUW, HasNSW);
}

Value *CreateShl(Value *LHS, const APInt &RHS, const Twine &Name = "",
                 bool HasNUW = false, bool HasNSW = false) {
  return CreateShl(LHS, ConstantInt::get(LHS->getType(), RHS), Name,
                   HasNUW, HasNSW);
}

Value *CreateShl(Value *LHS, uint64_t RHS, const Twine &Name = "",
                 bool HasNUW = false, bool HasNSW = false) {
  return CreateShl(LHS, ConstantInt::get(LHS->getType(), RHS), Name,
                   HasNUW, HasNSW);
}

Value *CreateLShr(Value *LHS, Value *RHS, const Twine &Name = "",
                  bool isExact = false) {
  if (auto *LC = dyn_cast<Constant>(LHS))
    if (auto *RC = dyn_cast<Constant>(RHS))
      return Insert(Folder.CreateLShr(LC, RC, isExact), Name);
  if (!isExact)
    return Insert(BinaryOperator::CreateLShr(LHS, RHS), Name);
  return Insert(BinaryOperator::CreateExactLShr(LHS, RHS), Name);
}

Value *CreateLShr(Value *LHS, const APInt &RHS, const Twine &Name = "",
                  bool isExact = false) {
  return CreateLShr(LHS, ConstantInt::get(LHS->getType(), RHS), Name,isExact);
}

Value *CreateLShr(Value *LHS, uint64_t RHS, const Twine &Name = "",
                  bool isExact = false) {
  return CreateLShr(LHS, ConstantInt::get(LHS->getType(), RHS), Name,isExact);
}

Value *CreateAShr(Value *LHS, Value *RHS, const Twine &Name = "",
                  bool isExact = false) {
  if (auto *LC = dyn_cast<Constant>(LHS))
    if (auto *RC = dyn_cast<Constant>(RHS))
      return Insert(Folder.CreateAShr(LC, RC, isExact), Name);
  if (!isExact)
    return Insert(BinaryOperator::CreateAShr(LHS, RHS), Name);
  return Insert(BinaryOperator::CreateExactAShr(LHS, RHS), Name);
}

Value *CreateAShr(Value *LHS, const APInt &RHS, const Twine &Name = "",
                  bool isExact = false) {
  return CreateAShr(LHS, ConstantInt::get(LHS->getType(), RHS), Name,isExact);
}

Value *CreateAShr(Value *LHS, uint64_t RHS, const Twine &Name = "",
                  bool isExact = false) {
  return CreateAShr(LHS, ConstantInt::get(LHS->getType(), RHS), Name,isExact);
}

Value *CreateAnd(Value *LHS, Value *RHS, const Twine &Name = "") {
  if (auto *RC = dyn_cast<Constant>(RHS)) {
    if (isa<ConstantInt>(RC) && cast<ConstantInt>(RC)->isMinusOne())
      return LHS;  // LHS & -1 -> LHS
    if (auto *LC = dyn_cast<Constant>(LHS))
      return Insert(Folder.CreateAnd(LC, RC), Name);
  }
  return Insert(BinaryOperator::CreateAnd(LHS, RHS), Name);
}

Value *CreateAnd(Value *LHS, const APInt &RHS, const Twine &Name = "") {
  return CreateAnd(LHS, ConstantInt::get(LHS->getType(), RHS), Name);
}

Value *CreateAnd(Value *LHS, uint64_t RHS, const Twine &Name = "") {
  return CreateAnd(LHS, ConstantInt::get(LHS->getType(), RHS), Name);
}

Value *CreateAnd(ArrayRef<Value*> Ops) {
  assert(!Ops.empty())((!Ops.empty()) ? static_cast<void> (0) : __assert_fail
 ("!Ops.empty()", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 1302, __PRETTY_FUNCTION__));
  Value *Accum = Ops[0];
  for (unsigned i = 1; i < Ops.size(); i++)
    Accum = CreateAnd(Accum, Ops[i]);
  return Accum;
}

Value *CreateOr(Value *LHS, Value *RHS, const Twine &Name = "") {
  if (auto *RC = dyn_cast<Constant>(RHS)) {
    if (RC->isNullValue())
      return LHS;  // LHS | 0 -> LHS
    if (auto *LC = dyn_cast<Constant>(LHS))
      return Insert(Folder.CreateOr(LC, RC), Name);
  }
  return Insert(BinaryOperator::CreateOr(LHS, RHS), Name);
}

Value *CreateOr(Value *LHS, const APInt &RHS, const Twine &Name = "") {
  return CreateOr(LHS, ConstantInt::get(LHS->getType(), RHS), Name);
}

Value *CreateOr(Value *LHS, uint64_t RHS, const Twine &Name = "") {
  return CreateOr(LHS, ConstantInt::get(LHS->getType(), RHS), Name);
}

Value *CreateOr(ArrayRef<Value*> Ops) {
  assert(!Ops.empty())((!Ops.empty()) ? static_cast<void> (0) : __assert_fail
 ("!Ops.empty()", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 1328, __PRETTY_FUNCTION__));
  Value *Accum = Ops[0];
  for (unsigned i = 1; i < Ops.size(); i++)
    Accum = CreateOr(Accum, Ops[i]);
  return Accum;
}

Value *CreateXor(Value *LHS, Value *RHS, const Twine &Name = "") {
  if (Value *V = foldConstant(Instruction::Xor, LHS, RHS, Name)) return V;
  return Insert(BinaryOperator::CreateXor(LHS, RHS), Name);
}

Value *CreateXor(Value *LHS, const APInt &RHS, const Twine &Name = "") {
  return CreateXor(LHS, ConstantInt::get(LHS->getType(), RHS), Name);
}

Value *CreateXor(Value *LHS, uint64_t RHS, const Twine &Name = "") {
  return CreateXor(LHS, ConstantInt::get(LHS->getType(), RHS), Name);
}

Value *CreateFAdd(Value *L, Value *R, const Twine &Name = "",
                  MDNode *FPMD = nullptr) {
  if (IsFPConstrained)
    return CreateConstrainedFPBinOp(Intrinsic::experimental_constrained_fadd,
                                    L, R, nullptr, Name, FPMD);

  if (Value *V = foldConstant(Instruction::FAdd, L, R, Name)) return V;
  Instruction *I = setFPAttrs(BinaryOperator::CreateFAdd(L, R), FPMD, FMF);
  return Insert(I, Name);
}

/// Copy fast-math-flags from an instruction rather than using the builder's
/// default FMF.
Value *CreateFAddFMF(Value *L, Value *R, Instruction *FMFSource,
                     const Twine &Name = "") {
  if (IsFPConstrained)
    return CreateConstrainedFPBinOp(Intrinsic::experimental_constrained_fadd,
                                    L, R, FMFSource, Name);

  if (Value *V = foldConstant(Instruction::FAdd, L, R, Name)) return V;
  Instruction *I = setFPAttrs(BinaryOperator::CreateFAdd(L, R), nullptr,
                              FMFSource->getFastMathFlags());
  return Insert(I, Name);
}

Value *CreateFSub(Value *L, Value *R, const Twine &Name = "",
                  MDNode *FPMD = nullptr) {
  if (IsFPConstrained)
    return CreateConstrainedFPBinOp(Intrinsic::experimental_constrained_fsub,
                                    L, R, nullptr, Name, FPMD);

  if (Value *V = foldConstant(Instruction::FSub, L, R, Name)) return V;
  Instruction *I = setFPAttrs(BinaryOperator::CreateFSub(L, R), FPMD, FMF);
  return Insert(I, Name);
}

/// Copy fast-math-flags from an instruction rather than using the builder's
/// default FMF.
Value *CreateFSubFMF(Value *L, Value *R, Instruction *FMFSource,
                     const Twine &Name = "") {
  if (IsFPConstrained)
    return CreateConstrainedFPBinOp(Intrinsic::experimental_constrained_fsub,
                                    L, R, FMFSource, Name);

  if (Value *V = foldConstant(Instruction::FSub, L, R, Name)) return V;
  Instruction *I = setFPAttrs(BinaryOperator::CreateFSub(L, R), nullptr,
                              FMFSource->getFastMathFlags());
  return Insert(I, Name);
}

Value *CreateFMul(Value *L, Value *R, const Twine &Name = "",
                  MDNode *FPMD = nullptr) {
  if (IsFPConstrained)
    return CreateConstrainedFPBinOp(Intrinsic::experimental_constrained_fmul,
                                    L, R, nullptr, Name, FPMD);

  if (Value *V = foldConstant(Instruction::FMul, L, R, Name)) return V;
  Instruction *I = setFPAttrs(BinaryOperator::CreateFMul(L, R), FPMD, FMF);
  return Insert(I, Name);
}

/// Copy fast-math-flags from an instruction rather than using the builder's
/// default FMF.
Value *CreateFMulFMF(Value *L, Value *R, Instruction *FMFSource,
                     const Twine &Name = "") {
  if (IsFPConstrained)
    return CreateConstrainedFPBinOp(Intrinsic::experimental_constrained_fmul,
                                    L, R, FMFSource, Name);

  if (Value *V = foldConstant(Instruction::FMul, L, R, Name)) return V;
  Instruction *I = setFPAttrs(BinaryOperator::CreateFMul(L, R), nullptr,
                              FMFSource->getFastMathFlags());
  return Insert(I, Name);
}

Value *CreateFDiv(Value *L, Value *R, const Twine &Name = "",
                  MDNode *FPMD = nullptr) {
  if (IsFPConstrained)
    return CreateConstrainedFPBinOp(Intrinsic::experimental_constrained_fdiv,
                                    L, R, nullptr, Name, FPMD);

  if (Value *V = foldConstant(Instruction::FDiv, L, R, Name)) return V;
  Instruction *I = setFPAttrs(BinaryOperator::CreateFDiv(L, R), FPMD, FMF);
  return Insert(I, Name);
}

/// Copy fast-math-flags from an instruction rather than using the builder's
/// default FMF.
Value *CreateFDivFMF(Value *L, Value *R, Instruction *FMFSource,
                     const Twine &Name = "") {
  if (IsFPConstrained)
    return CreateConstrainedFPBinOp(Intrinsic::experimental_constrained_fdiv,
                                    L, R, FMFSource, Name);

  if (Value *V = foldConstant(Instruction::FDiv, L, R, Name)) return V;
  Instruction *I = setFPAttrs(BinaryOperator::CreateFDiv(L, R), nullptr,
                              FMFSource->getFastMathFlags());
  return Insert(I, Name);
}

Value *CreateFRem(Value *L, Value *R, const Twine &Name = "",
                  MDNode *FPMD = nullptr) {
  if (IsFPConstrained)
    return CreateConstrainedFPBinOp(Intrinsic::experimental_constrained_frem,
                                    L, R, nullptr, Name, FPMD);

  if (Value *V = foldConstant(Instruction::FRem, L, R, Name)) return V;
  Instruction *I = setFPAttrs(BinaryOperator::CreateFRem(L, R), FPMD, FMF);
  return Insert(I, Name);
}

/// Copy fast-math-flags from an instruction rather than using the builder's
/// default FMF.
Value *CreateFRemFMF(Value *L, Value *R, Instruction *FMFSource,
                     const Twine &Name = "") {
  if (IsFPConstrained)
    return CreateConstrainedFPBinOp(Intrinsic::experimental_constrained_frem,
                                    L, R, FMFSource, Name);

  if (Value *V = foldConstant(Instruction::FRem, L, R, Name)) return V;
  Instruction *I = setFPAttrs(BinaryOperator::CreateFRem(L, R), nullptr,
                              FMFSource->getFastMathFlags());
  return Insert(I, Name);
}

Value *CreateBinOp(Instruction::BinaryOps Opc,
                   Value *LHS, Value *RHS, const Twine &Name = "",
                   MDNode *FPMathTag = nullptr) {
  if (Value *V = foldConstant(Opc, LHS, RHS, Name)) return V;
  Instruction *BinOp = BinaryOperator::Create(Opc, LHS, RHS);
  if (isa<FPMathOperator>(BinOp))
    setFPAttrs(BinOp, FPMathTag, FMF);
  return Insert(BinOp, Name);
}

CallInst *CreateConstrainedFPBinOp(
    Intrinsic::ID ID, Value *L, Value *R, Instruction *FMFSource = nullptr,
    const Twine &Name = "", MDNode *FPMathTag = nullptr,
    Optional<ConstrainedFPIntrinsic::RoundingMode> Rounding = None,
    Optional<ConstrainedFPIntrinsic::ExceptionBehavior> Except = None) {
  Value *RoundingV = getConstrainedFPRounding(Rounding);
  Value *ExceptV = getConstrainedFPExcept(Except);

  FastMathFlags UseFMF = FMF;
  if (FMFSource)
    UseFMF = FMFSource->getFastMathFlags();

  CallInst *C = CreateIntrinsic(ID, {L->getType()},
                                {L, R, RoundingV, ExceptV}, nullptr, Name);
  setConstrainedFPCallAttr(C);
  setFPAttrs(C, FPMathTag, UseFMF);
  return C;
}

Value *CreateNeg(Value *V, const Twine &Name = "",
                 bool HasNUW = false, bool HasNSW = false) {
  if (auto *VC = dyn_cast<Constant>(V))
    return Insert(Folder.CreateNeg(VC, HasNUW, HasNSW), Name);
  BinaryOperator *BO = Insert(BinaryOperator::CreateNeg(V), Name);
  if (HasNUW) BO->setHasNoUnsignedWrap();
  if (HasNSW) BO->setHasNoSignedWrap();
  return BO;
}

Value *CreateNSWNeg(Value *V, const Twine &Name = "") {
  return CreateNeg(V, Name, false, true);
}

Value *CreateNUWNeg(Value *V, const Twine &Name = "") {
  return CreateNeg(V, Name, true, false);
}

Value *CreateFNeg(Value *V, const Twine &Name = "",
                  MDNode *FPMathTag = nullptr) {
  if (auto *VC = dyn_cast<Constant>(V))
    return Insert(Folder.CreateFNeg(VC), Name);
  return Insert(setFPAttrs(UnaryOperator::CreateFNeg(V), FPMathTag, FMF),
                Name);
}

/// Copy fast-math-flags from an instruction rather than using the builder's
/// default FMF.
Value *CreateFNegFMF(Value *V, Instruction *FMFSource,
                     const Twine &Name = "") {
 if (auto *VC = dyn_cast<Constant>(V))
   return Insert(Folder.CreateFNeg(VC), Name);
 return Insert(setFPAttrs(UnaryOperator::CreateFNeg(V), nullptr,
                          FMFSource->getFastMathFlags()),
               Name);
}

Value *CreateNot(Value *V, const Twine &Name = "") {
  if (auto *VC = dyn_cast<Constant>(V))
    return Insert(Folder.CreateNot(VC), Name);
  return Insert(BinaryOperator::CreateNot(V), Name);
}

Value *CreateUnOp(Instruction::UnaryOps Opc,
                  Value *V, const Twine &Name = "",
                  MDNode *FPMathTag = nullptr) {
  if (auto *VC = dyn_cast<Constant>(V))
    return Insert(Folder.CreateUnOp(Opc, VC), Name);
  Instruction *UnOp = UnaryOperator::Create(Opc, V);
  if (isa<FPMathOperator>(UnOp))
    setFPAttrs(UnOp, FPMathTag, FMF);
  return Insert(UnOp, Name);
}

/// Create either a UnaryOperator or BinaryOperator depending on \p Opc.
/// Correct number of operands must be passed accordingly.
Value *CreateNAryOp(unsigned Opc, ArrayRef<Value *> Ops,
                    const Twine &Name = "",
                    MDNode *FPMathTag = nullptr) {
  if (Instruction::isBinaryOp(Opc)) {
    assert(Ops.size() == 2 && "Invalid number of operands!")((Ops.size() == 2 && "Invalid number of operands!") ?
 static_cast<void> (0) : __assert_fail ("Ops.size() == 2 && \"Invalid number of operands!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 1562, __PRETTY_FUNCTION__));
    return CreateBinOp(static_cast<Instruction::BinaryOps>(Opc),
                       Ops[0], Ops[1], Name, FPMathTag);
  }
  if (Instruction::isUnaryOp(Opc)) {
    assert(Ops.size() == 1 && "Invalid number of operands!")((Ops.size() == 1 && "Invalid number of operands!") ?
 static_cast<void> (0) : __assert_fail ("Ops.size() == 1 && \"Invalid number of operands!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 1567, __PRETTY_FUNCTION__));
    return CreateUnOp(static_cast<Instruction::UnaryOps>(Opc),
                      Ops[0], Name, FPMathTag);
  }
  llvm_unreachable("Unexpected opcode!")::llvm::llvm_unreachable_internal("Unexpected opcode!", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 1571);
}

//===--------------------------------------------------------------------===//
// Instruction creation methods: Memory Instructions
//===--------------------------------------------------------------------===//

AllocaInst *CreateAlloca(Type *Ty, unsigned AddrSpace,
                         Value *ArraySize = nullptr, const Twine &Name = "") {
  return Insert(new AllocaInst(Ty, AddrSpace, ArraySize), Name);
}

AllocaInst *CreateAlloca(Type *Ty, Value *ArraySize = nullptr,
                         const Twine &Name = "") {
  const DataLayout &DL = BB->getParent()->getParent()->getDataLayout();
  return Insert(new AllocaInst(Ty, DL.getAllocaAddrSpace(), ArraySize), Name);
}

/// Provided to resolve 'CreateLoad(Ty, Ptr, "...")' correctly, instead of
/// converting the string to 'bool' for the isVolatile parameter.
LoadInst *CreateLoad(Type *Ty, Value *Ptr, const char *Name) {
  return Insert(new LoadInst(Ty, Ptr), Name);
}

LoadInst *CreateLoad(Type *Ty, Value *Ptr, const Twine &Name = "") {
  return Insert(new LoadInst(Ty, Ptr), Name);
}

LoadInst *CreateLoad(Type *Ty, Value *Ptr, bool isVolatile,
                     const Twine &Name = "") {
  return Insert(new LoadInst(Ty, Ptr, Twine(), isVolatile), Name);
}

// Deprecated [opaque pointer types]
LoadInst *CreateLoad(Value *Ptr, const char *Name) {
  return CreateLoad(Ptr->getType()->getPointerElementType(), Ptr, Name);
}

// Deprecated [opaque pointer types]
LoadInst *CreateLoad(Value *Ptr, const Twine &Name = "") {
  return CreateLoad(Ptr->getType()->getPointerElementType(), Ptr, Name);
}

// Deprecated [opaque pointer types]
LoadInst *CreateLoad(Value *Ptr, bool isVolatile, const Twine &Name = "") {
  return CreateLoad(Ptr->getType()->getPointerElementType(), Ptr, isVolatile,
                    Name);
}

StoreInst *CreateStore(Value *Val, Value *Ptr, bool isVolatile = false) {
  return Insert(new StoreInst(Val, Ptr, isVolatile));
}

/// Provided to resolve 'CreateAlignedLoad(Ptr, Align, "...")'
/// correctly, instead of converting the string to 'bool' for the isVolatile
/// parameter.
LoadInst *CreateAlignedLoad(Type *Ty, Value *Ptr, unsigned Align,
                            const char *Name) {
  LoadInst *LI = CreateLoad(Ty, Ptr, Name);
  LI->setAlignment(MaybeAlign(Align));
  return LI;
}
LoadInst *CreateAlignedLoad(Type *Ty, Value *Ptr, unsigned Align,
                            const Twine &Name = "") {
  LoadInst *LI = CreateLoad(Ty, Ptr, Name);
  LI->setAlignment(MaybeAlign(Align));
  return LI;
}
LoadInst *CreateAlignedLoad(Type *Ty, Value *Ptr, unsigned Align,
                            bool isVolatile, const Twine &Name = "") {
  LoadInst *LI = CreateLoad(Ty, Ptr, isVolatile, Name);
  LI->setAlignment(MaybeAlign(Align));
  return LI;
}

// Deprecated [opaque pointer types]
LoadInst *CreateAlignedLoad(Value *Ptr, unsigned Align, const char *Name) {
  return CreateAlignedLoad(Ptr->getType()->getPointerElementType(), Ptr,
                           Align, Name);
}
// Deprecated [opaque pointer types]
LoadInst *CreateAlignedLoad(Value *Ptr, unsigned Align,
                            const Twine &Name = "") {
  return CreateAlignedLoad(Ptr->getType()->getPointerElementType(), Ptr,
                           Align, Name);
}
// Deprecated [opaque pointer types]
LoadInst *CreateAlignedLoad(Value *Ptr, unsigned Align, bool isVolatile,
                            const Twine &Name = "") {
  return CreateAlignedLoad(Ptr->getType()->getPointerElementType(), Ptr,
                           Align, isVolatile, Name);
}

StoreInst *CreateAlignedStore(Value *Val, Value *Ptr, unsigned Align,
                              bool isVolatile = false) {
  StoreInst *SI = CreateStore(Val, Ptr, isVolatile);
  SI->setAlignment(MaybeAlign(Align));
  return SI;
}

FenceInst *CreateFence(AtomicOrdering Ordering,
                       SyncScope::ID SSID = SyncScope::System,
                       const Twine &Name = "") {
  return Insert(new FenceInst(Context, Ordering, SSID), Name);
}

AtomicCmpXchgInst *
CreateAtomicCmpXchg(Value *Ptr, Value *Cmp, Value *New,
                    AtomicOrdering SuccessOrdering,
                    AtomicOrdering FailureOrdering,
                    SyncScope::ID SSID = SyncScope::System) {
  return Insert(new AtomicCmpXchgInst(Ptr, Cmp, New, SuccessOrdering,
                                      FailureOrdering, SSID));
}

AtomicRMWInst *CreateAtomicRMW(AtomicRMWInst::BinOp Op, Value *Ptr, Value *Val,
                               AtomicOrdering Ordering,
                               SyncScope::ID SSID = SyncScope::System) {
  return Insert(new AtomicRMWInst(Op, Ptr, Val, Ordering, SSID));
}

Value *CreateGEP(Value *Ptr, ArrayRef<Value *> IdxList,
                 const Twine &Name = "") {
  return CreateGEP(nullptr, Ptr, IdxList, Name);
}

Value *CreateGEP(Type *Ty, Value *Ptr, ArrayRef<Value *> IdxList,
                 const Twine &Name = "") {
  if (auto *PC = dyn_cast<Constant>(Ptr)) {
    // Every index must be constant.
    size_t i, e;
    for (i = 0, e = IdxList.size(); i != e; ++i)
      if (!isa<Constant>(IdxList[i]))
        break;
    if (i == e)
      return Insert(Folder.CreateGetElementPtr(Ty, PC, IdxList), Name);
  }
  return Insert(GetElementPtrInst::Create(Ty, Ptr, IdxList), Name);
}

Value *CreateInBoundsGEP(Value *Ptr, ArrayRef<Value *> IdxList,
                         const Twine &Name = "") {
  return CreateInBoundsGEP(nullptr, Ptr, IdxList, Name);
}

Value *CreateInBoundsGEP(Type *Ty, Value *Ptr, ArrayRef<Value *> IdxList,
                         const Twine &Name = "") {
  if (auto *PC = dyn_cast<Constant>(Ptr)) {
    // Every index must be constant.
    size_t i, e;
    for (i = 0, e = IdxList.size(); i != e; ++i)
      if (!isa<Constant>(IdxList[i]))
        break;
    if (i == e)
      return Insert(Folder.CreateInBoundsGetElementPtr(Ty, PC, IdxList),
                    Name);
  }
  return Insert(GetElementPtrInst::CreateInBounds(Ty, Ptr, IdxList), Name);
}

Value *CreateGEP(Value *Ptr, Value *Idx, const Twine &Name = "") {
  return CreateGEP(nullptr, Ptr, Idx, Name);
}

Value *CreateGEP(Type *Ty, Value *Ptr, Value *Idx, const Twine &Name = "") {
  if (auto *PC = dyn_cast<Constant>(Ptr))
    if (auto *IC = dyn_cast<Constant>(Idx))
      return Insert(Folder.CreateGetElementPtr(Ty, PC, IC), Name);
  return Insert(GetElementPtrInst::Create(Ty, Ptr, Idx), Name);
}

Value *CreateInBoundsGEP(Type *Ty, Value *Ptr, Value *Idx,
                         const Twine &Name = "") {
  if (auto *PC40.1
'PC' is null
1
'PC' is null
1
'PC' is null
 = dyn_cast<Constant>(Ptr))
40
←
Assuming 'Ptr' is not a 'Constant'→
41
←
Taking false branch→
    if (auto *IC = dyn_cast<Constant>(Idx))
      return Insert(Folder.CreateInBoundsGetElementPtr(Ty, PC, IC), Name);
  return Insert(GetElementPtrInst::CreateInBounds(Ty, Ptr, Idx), Name);
42
←
Calling 'IRBuilder::Insert'→
52
←
Returning from 'IRBuilder::Insert'→
}

Value *CreateConstGEP1_32(Value *Ptr, unsigned Idx0, const Twine &Name = "") {
  return CreateConstGEP1_32(nullptr, Ptr, Idx0, Name);
}

Value *CreateConstGEP1_32(Type *Ty, Value *Ptr, unsigned Idx0,
                          const Twine &Name = "") {
  Value *Idx = ConstantInt::get(Type::getInt32Ty(Context), Idx0);

  if (auto *PC = dyn_cast<Constant>(Ptr))
    return Insert(Folder.CreateGetElementPtr(Ty, PC, Idx), Name);

  return Insert(GetElementPtrInst::Create(Ty, Ptr, Idx), Name);
}

Value *CreateConstInBoundsGEP1_32(Type *Ty, Value *Ptr, unsigned Idx0,
                                  const Twine &Name = "") {
  Value *Idx = ConstantInt::get(Type::getInt32Ty(Context), Idx0);

  if (auto *PC = dyn_cast<Constant>(Ptr))
    return Insert(Folder.CreateInBoundsGetElementPtr(Ty, PC, Idx), Name);

  return Insert(GetElementPtrInst::CreateInBounds(Ty, Ptr, Idx), Name);
}

Value *CreateConstGEP2_32(Type *Ty, Value *Ptr, unsigned Idx0, unsigned Idx1,
                          const Twine &Name = "") {
  Value *Idxs[] = {
    ConstantInt::get(Type::getInt32Ty(Context), Idx0),
    ConstantInt::get(Type::getInt32Ty(Context), Idx1)
  };

  if (auto *PC = dyn_cast<Constant>(Ptr))
    return Insert(Folder.CreateGetElementPtr(Ty, PC, Idxs), Name);

  return Insert(GetElementPtrInst::Create(Ty, Ptr, Idxs), Name);
}

Value *CreateConstInBoundsGEP2_32(Type *Ty, Value *Ptr, unsigned Idx0,
                                  unsigned Idx1, const Twine &Name = "") {
  Value *Idxs[] = {
    ConstantInt::get(Type::getInt32Ty(Context), Idx0),
    ConstantInt::get(Type::getInt32Ty(Context), Idx1)
  };

  if (auto *PC = dyn_cast<Constant>(Ptr))
    return Insert(Folder.CreateInBoundsGetElementPtr(Ty, PC, Idxs), Name);

  return Insert(GetElementPtrInst::CreateInBounds(Ty, Ptr, Idxs), Name);
}

Value *CreateConstGEP1_64(Type *Ty, Value *Ptr, uint64_t Idx0,
                          const Twine &Name = "") {
  Value *Idx = ConstantInt::get(Type::getInt64Ty(Context), Idx0);

  if (auto *PC = dyn_cast<Constant>(Ptr))
    return Insert(Folder.CreateGetElementPtr(Ty, PC, Idx), Name);

  return Insert(GetElementPtrInst::Create(Ty, Ptr, Idx), Name);
}

Value *CreateConstGEP1_64(Value *Ptr, uint64_t Idx0, const Twine &Name = "") {
  return CreateConstGEP1_64(nullptr, Ptr, Idx0, Name);
}

Value *CreateConstInBoundsGEP1_64(Type *Ty, Value *Ptr, uint64_t Idx0,
                                  const Twine &Name = "") {
  Value *Idx = ConstantInt::get(Type::getInt64Ty(Context), Idx0);

  if (auto *PC = dyn_cast<Constant>(Ptr))
    return Insert(Folder.CreateInBoundsGetElementPtr(Ty, PC, Idx), Name);

  return Insert(GetElementPtrInst::CreateInBounds(Ty, Ptr, Idx), Name);
}

Value *CreateConstInBoundsGEP1_64(Value *Ptr, uint64_t Idx0,
                                  const Twine &Name = "") {
  return CreateConstInBoundsGEP1_64(nullptr, Ptr, Idx0, Name);
}

Value *CreateConstGEP2_64(Type *Ty, Value *Ptr, uint64_t Idx0, uint64_t Idx1,
                          const Twine &Name = "") {
  Value *Idxs[] = {
    ConstantInt::get(Type::getInt64Ty(Context), Idx0),
    ConstantInt::get(Type::getInt64Ty(Context), Idx1)
  };

  if (auto *PC = dyn_cast<Constant>(Ptr))
    return Insert(Folder.CreateGetElementPtr(Ty, PC, Idxs), Name);

  return Insert(GetElementPtrInst::Create(Ty, Ptr, Idxs), Name);
}

Value *CreateConstGEP2_64(Value *Ptr, uint64_t Idx0, uint64_t Idx1,
                          const Twine &Name = "") {
  return CreateConstGEP2_64(nullptr, Ptr, Idx0, Idx1, Name);
}

Value *CreateConstInBoundsGEP2_64(Type *Ty, Value *Ptr, uint64_t Idx0,
                                  uint64_t Idx1, const Twine &Name = "") {
  Value *Idxs[] = {
    ConstantInt::get(Type::getInt64Ty(Context), Idx0),
    ConstantInt::get(Type::getInt64Ty(Context), Idx1)
  };

  if (auto *PC = dyn_cast<Constant>(Ptr))
    return Insert(Folder.CreateInBoundsGetElementPtr(Ty, PC, Idxs), Name);

  return Insert(GetElementPtrInst::CreateInBounds(Ty, Ptr, Idxs), Name);
}

Value *CreateConstInBoundsGEP2_64(Value *Ptr, uint64_t Idx0, uint64_t Idx1,
                                  const Twine &Name = "") {
  return CreateConstInBoundsGEP2_64(nullptr, Ptr, Idx0, Idx1, Name);
}

Value *CreateStructGEP(Type *Ty, Value *Ptr, unsigned Idx,
                       const Twine &Name = "") {
  return CreateConstInBoundsGEP2_32(Ty, Ptr, 0, Idx, Name);
}

Value *CreateStructGEP(Value *Ptr, unsigned Idx, const Twine &Name = "") {
  return CreateConstInBoundsGEP2_32(nullptr, Ptr, 0, Idx, Name);
}

/// Same as CreateGlobalString, but return a pointer with "i8*" type
/// instead of a pointer to array of i8.
Constant *CreateGlobalStringPtr(StringRef Str, const Twine &Name = "",
                                unsigned AddressSpace = 0) {
  GlobalVariable *GV = CreateGlobalString(Str, Name, AddressSpace);
  Constant *Zero = ConstantInt::get(Type::getInt32Ty(Context), 0);
  Constant *Indices[] = {Zero, Zero};
  return ConstantExpr::getInBoundsGetElementPtr(GV->getValueType(), GV,
                                                Indices);
}

//===--------------------------------------------------------------------===//
// Instruction creation methods: Cast/Conversion Operators
//===--------------------------------------------------------------------===//

Value *CreateTrunc(Value *V, Type *DestTy, const Twine &Name = "") {
  return CreateCast(Instruction::Trunc, V, DestTy, Name);
}

Value *CreateZExt(Value *V, Type *DestTy, const Twine &Name = "") {
  return CreateCast(Instruction::ZExt, V, DestTy, Name);
}

Value *CreateSExt(Value *V, Type *DestTy, const Twine &Name = "") {
  return CreateCast(Instruction::SExt, V, DestTy, Name);
}

/// Create a ZExt or Trunc from the integer value V to DestTy. Return
/// the value untouched if the type of V is already DestTy.
Value *CreateZExtOrTrunc(Value *V, Type *DestTy,
                         const Twine &Name = "") {
  assert(V->getType()->isIntOrIntVectorTy() &&((V->getType()->isIntOrIntVectorTy() && DestTy->
isIntOrIntVectorTy() && "Can only zero extend/truncate integers!"
) ? static_cast<void> (0) : __assert_fail ("V->getType()->isIntOrIntVectorTy() && DestTy->isIntOrIntVectorTy() && \"Can only zero extend/truncate integers!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 1907, __PRETTY_FUNCTION__))
         DestTy->isIntOrIntVectorTy() &&((V->getType()->isIntOrIntVectorTy() && DestTy->
isIntOrIntVectorTy() && "Can only zero extend/truncate integers!"
) ? static_cast<void> (0) : __assert_fail ("V->getType()->isIntOrIntVectorTy() && DestTy->isIntOrIntVectorTy() && \"Can only zero extend/truncate integers!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 1907, __PRETTY_FUNCTION__))
         "Can only zero extend/truncate integers!")((V->getType()->isIntOrIntVectorTy() && DestTy->
isIntOrIntVectorTy() && "Can only zero extend/truncate integers!"
) ? static_cast<void> (0) : __assert_fail ("V->getType()->isIntOrIntVectorTy() && DestTy->isIntOrIntVectorTy() && \"Can only zero extend/truncate integers!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 1907, __PRETTY_FUNCTION__));
  Type *VTy = V->getType();
  if (VTy->getScalarSizeInBits() < DestTy->getScalarSizeInBits())
    return CreateZExt(V, DestTy, Name);
  if (VTy->getScalarSizeInBits() > DestTy->getScalarSizeInBits())
    return CreateTrunc(V, DestTy, Name);
  return V;
}

/// Create a SExt or Trunc from the integer value V to DestTy. Return
/// the value untouched if the type of V is already DestTy.
Value *CreateSExtOrTrunc(Value *V, Type *DestTy,
                         const Twine &Name = "") {
  assert(V->getType()->isIntOrIntVectorTy() &&((V->getType()->isIntOrIntVectorTy() && DestTy->
isIntOrIntVectorTy() && "Can only sign extend/truncate integers!"
) ? static_cast<void> (0) : __assert_fail ("V->getType()->isIntOrIntVectorTy() && DestTy->isIntOrIntVectorTy() && \"Can only sign extend/truncate integers!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 1922, __PRETTY_FUNCTION__))
         DestTy->isIntOrIntVectorTy() &&((V->getType()->isIntOrIntVectorTy() && DestTy->
isIntOrIntVectorTy() && "Can only sign extend/truncate integers!"
) ? static_cast<void> (0) : __assert_fail ("V->getType()->isIntOrIntVectorTy() && DestTy->isIntOrIntVectorTy() && \"Can only sign extend/truncate integers!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 1922, __PRETTY_FUNCTION__))
         "Can only sign extend/truncate integers!")((V->getType()->isIntOrIntVectorTy() && DestTy->
isIntOrIntVectorTy() && "Can only sign extend/truncate integers!"
) ? static_cast<void> (0) : __assert_fail ("V->getType()->isIntOrIntVectorTy() && DestTy->isIntOrIntVectorTy() && \"Can only sign extend/truncate integers!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 1922, __PRETTY_FUNCTION__));
  Type *VTy = V->getType();
  if (VTy->getScalarSizeInBits() < DestTy->getScalarSizeInBits())
    return CreateSExt(V, DestTy, Name);
  if (VTy->getScalarSizeInBits() > DestTy->getScalarSizeInBits())
    return CreateTrunc(V, DestTy, Name);
  return V;
}

Value *CreateFPToUI(Value *V, Type *DestTy, const Twine &Name = "") {
  if (IsFPConstrained)
    return CreateConstrainedFPCast(Intrinsic::experimental_constrained_fptoui,
                                   V, DestTy, nullptr, Name);
  return CreateCast(Instruction::FPToUI, V, DestTy, Name);
}

Value *CreateFPToSI(Value *V, Type *DestTy, const Twine &Name = "") {
  if (IsFPConstrained)
    return CreateConstrainedFPCast(Intrinsic::experimental_constrained_fptosi,
                                   V, DestTy, nullptr, Name);
  return CreateCast(Instruction::FPToSI, V, DestTy, Name);
}

Value *CreateUIToFP(Value *V, Type *DestTy, const Twine &Name = ""){
  return CreateCast(Instruction::UIToFP, V, DestTy, Name);
}

Value *CreateSIToFP(Value *V, Type *DestTy, const Twine &Name = ""){
  return CreateCast(Instruction::SIToFP, V, DestTy, Name);
}

Value *CreateFPTrunc(Value *V, Type *DestTy,
                     const Twine &Name = "") {
  if (IsFPConstrained)
    return CreateConstrainedFPCast(
        Intrinsic::experimental_constrained_fptrunc, V, DestTy, nullptr,
        Name);
  return CreateCast(Instruction::FPTrunc, V, DestTy, Name);
}

Value *CreateFPExt(Value *V, Type *DestTy, const Twine &Name = "") {
  if (IsFPConstrained)
    return CreateConstrainedFPCast(Intrinsic::experimental_constrained_fpext,
                                   V, DestTy, nullptr, Name);
  return CreateCast(Instruction::FPExt, V, DestTy, Name);
}

Value *CreatePtrToInt(Value *V, Type *DestTy,
                      const Twine &Name = "") {
  return CreateCast(Instruction::PtrToInt, V, DestTy, Name);
}

Value *CreateIntToPtr(Value *V, Type *DestTy,
                      const Twine &Name = "") {
  return CreateCast(Instruction::IntToPtr, V, DestTy, Name);
}

Value *CreateBitCast(Value *V, Type *DestTy,
                     const Twine &Name = "") {
  return CreateCast(Instruction::BitCast, V, DestTy, Name);
}

Value *CreateAddrSpaceCast(Value *V, Type *DestTy,
                           const Twine &Name = "") {
  return CreateCast(Instruction::AddrSpaceCast, V, DestTy, Name);
}

Value *CreateZExtOrBitCast(Value *V, Type *DestTy,
                           const Twine &Name = "") {
  if (V->getType() == DestTy)
    return V;
  if (auto *VC = dyn_cast<Constant>(V))
    return Insert(Folder.CreateZExtOrBitCast(VC, DestTy), Name);
  return Insert(CastInst::CreateZExtOrBitCast(V, DestTy), Name);
}

Value *CreateSExtOrBitCast(Value *V, Type *DestTy,
                           const Twine &Name = "") {
  if (V->getType() == DestTy)
    return V;
  if (auto *VC = dyn_cast<Constant>(V))
    return Insert(Folder.CreateSExtOrBitCast(VC, DestTy), Name);
  return Insert(CastInst::CreateSExtOrBitCast(V, DestTy), Name);
}

Value *CreateTruncOrBitCast(Value *V, Type *DestTy,
                            const Twine &Name = "") {
  if (V->getType() == DestTy)
    return V;
  if (auto *VC = dyn_cast<Constant>(V))
    return Insert(Folder.CreateTruncOrBitCast(VC, DestTy), Name);
  return Insert(CastInst::CreateTruncOrBitCast(V, DestTy), Name);
}

Value *CreateCast(Instruction::CastOps Op, Value *V, Type *DestTy,
                  const Twine &Name = "") {
  if (V->getType() == DestTy)
    return V;
  if (auto *VC = dyn_cast<Constant>(V))
    return Insert(Folder.CreateCast(Op, VC, DestTy), Name);
  return Insert(CastInst::Create(Op, V, DestTy), Name);
}

Value *CreatePointerCast(Value *V, Type *DestTy,
                         const Twine &Name = "") {
  if (V->getType() == DestTy)
    return V;
  if (auto *VC = dyn_cast<Constant>(V))
    return Insert(Folder.CreatePointerCast(VC, DestTy), Name);
  return Insert(CastInst::CreatePointerCast(V, DestTy), Name);
}

Value *CreatePointerBitCastOrAddrSpaceCast(Value *V, Type *DestTy,
                                           const Twine &Name = "") {
  if (V->getType() == DestTy)
    return V;

  if (auto *VC = dyn_cast<Constant>(V)) {
    return Insert(Folder.CreatePointerBitCastOrAddrSpaceCast(VC, DestTy),
                  Name);
  }

  return Insert(CastInst::CreatePointerBitCastOrAddrSpaceCast(V, DestTy),
                Name);
}

Value *CreateIntCast(Value *V, Type *DestTy, bool isSigned,
                     const Twine &Name = "") {
  if (V->getType() == DestTy)
    return V;
  if (auto *VC = dyn_cast<Constant>(V))
    return Insert(Folder.CreateIntCast(VC, DestTy, isSigned), Name);
  return Insert(CastInst::CreateIntegerCast(V, DestTy, isSigned), Name);
}

Value *CreateBitOrPointerCast(Value *V, Type *DestTy,
                              const Twine &Name = "") {
  if (V->getType() == DestTy)
    return V;
  if (V->getType()->isPtrOrPtrVectorTy() && DestTy->isIntOrIntVectorTy())
    return CreatePtrToInt(V, DestTy, Name);
  if (V->getType()->isIntOrIntVectorTy() && DestTy->isPtrOrPtrVectorTy())
    return CreateIntToPtr(V, DestTy, Name);

  return CreateBitCast(V, DestTy, Name);
}

Value *CreateFPCast(Value *V, Type *DestTy, const Twine &Name = "") {
  if (V->getType() == DestTy)
    return V;
  if (auto *VC = dyn_cast<Constant>(V))
    return Insert(Folder.CreateFPCast(VC, DestTy), Name);
  return Insert(CastInst::CreateFPCast(V, DestTy), Name);
}

CallInst *CreateConstrainedFPCast(
    Intrinsic::ID ID, Value *V, Type *DestTy,
    Instruction *FMFSource = nullptr, const Twine &Name = "",
    MDNode *FPMathTag = nullptr,
    Optional<ConstrainedFPIntrinsic::RoundingMode> Rounding = None,
    Optional<ConstrainedFPIntrinsic::ExceptionBehavior> Except = None) {
  Value *ExceptV = getConstrainedFPExcept(Except);

  FastMathFlags UseFMF = FMF;
  if (FMFSource)
    UseFMF = FMFSource->getFastMathFlags();

  CallInst *C;
  switch (ID) {
  default: {
    Value *RoundingV = getConstrainedFPRounding(Rounding);
    C = CreateIntrinsic(ID, {DestTy, V->getType()}, {V, RoundingV, ExceptV},
                        nullptr, Name);
  } break;
  case Intrinsic::experimental_constrained_fpext:
  case Intrinsic::experimental_constrained_fptoui:
  case Intrinsic::experimental_constrained_fptosi:
    C = CreateIntrinsic(ID, {DestTy, V->getType()}, {V, ExceptV}, nullptr,
                        Name);
    break;
  }
  setConstrainedFPCallAttr(C);

  if (isa<FPMathOperator>(C))
    setFPAttrs(C, FPMathTag, UseFMF);
  return C;
}

// Provided to resolve 'CreateIntCast(Ptr, Ptr, "...")', giving a
// compile time error, instead of converting the string to bool for the
// isSigned parameter.
Value *CreateIntCast(Value *, Type *, const char *) = delete;

//===--------------------------------------------------------------------===//
// Instruction creation methods: Compare Instructions
//===--------------------------------------------------------------------===//

Value *CreateICmpEQ(Value *LHS, Value *RHS, const Twine &Name = "") {
  return CreateICmp(ICmpInst::ICMP_EQ, LHS, RHS, Name);
}

Value *CreateICmpNE(Value *LHS, Value *RHS, const Twine &Name = "") {
  return CreateICmp(ICmpInst::ICMP_NE, LHS, RHS, Name);
}

Value *CreateICmpUGT(Value *LHS, Value *RHS, const Twine &Name = "") {
  return CreateICmp(ICmpInst::ICMP_UGT, LHS, RHS, Name);
}

Value *CreateICmpUGE(Value *LHS, Value *RHS, const Twine &Name = "") {
  return CreateICmp(ICmpInst::ICMP_UGE, LHS, RHS, Name);
}

Value *CreateICmpULT(Value *LHS, Value *RHS, const Twine &Name = "") {
  return CreateICmp(ICmpInst::ICMP_ULT, LHS, RHS, Name);
}

Value *CreateICmpULE(Value *LHS, Value *RHS, const Twine &Name = "") {
  return CreateICmp(ICmpInst::ICMP_ULE, LHS, RHS, Name);
}

Value *CreateICmpSGT(Value *LHS, Value *RHS, const Twine &Name = "") {
  return CreateICmp(ICmpInst::ICMP_SGT, LHS, RHS, Name);
}

Value *CreateICmpSGE(Value *LHS, Value *RHS, const Twine &Name = "") {
  return CreateICmp(ICmpInst::ICMP_SGE, LHS, RHS, Name);
}

Value *CreateICmpSLT(Value *LHS, Value *RHS, const Twine &Name = "") {
  return CreateICmp(ICmpInst::ICMP_SLT, LHS, RHS, Name);
}

Value *CreateICmpSLE(Value *LHS, Value *RHS, const Twine &Name = "") {
  return CreateICmp(ICmpInst::ICMP_SLE, LHS, RHS, Name);
}

Value *CreateFCmpOEQ(Value *LHS, Value *RHS, const Twine &Name = "",
                     MDNode *FPMathTag = nullptr) {
  return CreateFCmp(FCmpInst::FCMP_OEQ, LHS, RHS, Name, FPMathTag);
}

Value *CreateFCmpOGT(Value *LHS, Value *RHS, const Twine &Name = "",
                     MDNode *FPMathTag = nullptr) {
  return CreateFCmp(FCmpInst::FCMP_OGT, LHS, RHS, Name, FPMathTag);
}

Value *CreateFCmpOGE(Value *LHS, Value *RHS, const Twine &Name = "",
                     MDNode *FPMathTag = nullptr) {
  return CreateFCmp(FCmpInst::FCMP_OGE, LHS, RHS, Name, FPMathTag);
}

Value *CreateFCmpOLT(Value *LHS, Value *RHS, const Twine &Name = "",
                     MDNode *FPMathTag = nullptr) {
  return CreateFCmp(FCmpInst::FCMP_OLT, LHS, RHS, Name, FPMathTag);
}

Value *CreateFCmpOLE(Value *LHS, Value *RHS, const Twine &Name = "",
                     MDNode *FPMathTag = nullptr) {
  return CreateFCmp(FCmpInst::FCMP_OLE, LHS, RHS, Name, FPMathTag);
}

Value *CreateFCmpONE(Value *LHS, Value *RHS, const Twine &Name = "",
                     MDNode *FPMathTag = nullptr) {
  return CreateFCmp(FCmpInst::FCMP_ONE, LHS, RHS, Name, FPMathTag);
}

Value *CreateFCmpORD(Value *LHS, Value *RHS, const Twine &Name = "",
                     MDNode *FPMathTag = nullptr) {
  return CreateFCmp(FCmpInst::FCMP_ORD, LHS, RHS, Name, FPMathTag);
}

Value *CreateFCmpUNO(Value *LHS, Value *RHS, const Twine &Name = "",
                     MDNode *FPMathTag = nullptr) {
  return CreateFCmp(FCmpInst::FCMP_UNO, LHS, RHS, Name, FPMathTag);
}

Value *CreateFCmpUEQ(Value *LHS, Value *RHS, const Twine &Name = "",
                     MDNode *FPMathTag = nullptr) {
  return CreateFCmp(FCmpInst::FCMP_UEQ, LHS, RHS, Name, FPMathTag);
}

Value *CreateFCmpUGT(Value *LHS, Value *RHS, const Twine &Name = "",
                     MDNode *FPMathTag = nullptr) {
  return CreateFCmp(FCmpInst::FCMP_UGT, LHS, RHS, Name, FPMathTag);
}

Value *CreateFCmpUGE(Value *LHS, Value *RHS, const Twine &Name = "",
                     MDNode *FPMathTag = nullptr) {
  return CreateFCmp(FCmpInst::FCMP_UGE, LHS, RHS, Name, FPMathTag);
}

Value *CreateFCmpULT(Value *LHS, Value *RHS, const Twine &Name = "",
                     MDNode *FPMathTag = nullptr) {
  return CreateFCmp(FCmpInst::FCMP_ULT, LHS, RHS, Name, FPMathTag);
}

Value *CreateFCmpULE(Value *LHS, Value *RHS, const Twine &Name = "",
                     MDNode *FPMathTag = nullptr) {
  return CreateFCmp(FCmpInst::FCMP_ULE, LHS, RHS, Name, FPMathTag);
}

Value *CreateFCmpUNE(Value *LHS, Value *RHS, const Twine &Name = "",
                     MDNode *FPMathTag = nullptr) {
  return CreateFCmp(FCmpInst::FCMP_UNE, LHS, RHS, Name, FPMathTag);
}

Value *CreateICmp(CmpInst::Predicate P, Value *LHS, Value *RHS,
                  const Twine &Name = "") {
  if (auto *LC = dyn_cast<Constant>(LHS))
    if (auto *RC = dyn_cast<Constant>(RHS))
      return Insert(Folder.CreateICmp(P, LC, RC), Name);
  return Insert(new ICmpInst(P, LHS, RHS), Name);
}

Value *CreateFCmp(CmpInst::Predicate P, Value *LHS, Value *RHS,
                  const Twine &Name = "", MDNode *FPMathTag = nullptr) {
  if (auto *LC = dyn_cast<Constant>(LHS))
    if (auto *RC = dyn_cast<Constant>(RHS))
      return Insert(Folder.CreateFCmp(P, LC, RC), Name);
  return Insert(setFPAttrs(new FCmpInst(P, LHS, RHS), FPMathTag, FMF), Name);
}

//===--------------------------------------------------------------------===//
// Instruction creation methods: Other Instructions
//===--------------------------------------------------------------------===//

PHINode *CreatePHI(Type *Ty, unsigned NumReservedValues,
                   const Twine &Name = "") {
  PHINode *Phi = PHINode::Create(Ty, NumReservedValues);
  if (isa<FPMathOperator>(Phi))
    setFPAttrs(Phi, nullptr /* MDNode* */, FMF);
  return Insert(Phi, Name);
}

CallInst *CreateCall(FunctionType *FTy, Value *Callee,
                     ArrayRef<Value *> Args = None, const Twine &Name = "",
                     MDNode *FPMathTag = nullptr) {
  CallInst *CI = CallInst::Create(FTy, Callee, Args, DefaultOperandBundles);
  if (IsFPConstrained)
    setConstrainedFPCallAttr(CI);
  if (isa<FPMathOperator>(CI))
    setFPAttrs(CI, FPMathTag, FMF);
  return Insert(CI, Name);
}

CallInst *CreateCall(FunctionType *FTy, Value *Callee, ArrayRef<Value *> Args,
                     ArrayRef<OperandBundleDef> OpBundles,
                     const Twine &Name = "", MDNode *FPMathTag = nullptr) {
  CallInst *CI = CallInst::Create(FTy, Callee, Args, OpBundles);
  if (IsFPConstrained)
    setConstrainedFPCallAttr(CI);
  if (isa<FPMathOperator>(CI))
    setFPAttrs(CI, FPMathTag, FMF);
  return Insert(CI, Name);
}

CallInst *CreateCall(FunctionCallee Callee, ArrayRef<Value *> Args = None,
                     const Twine &Name = "", MDNode *FPMathTag = nullptr) {
  return CreateCall(Callee.getFunctionType(), Callee.getCallee(), Args, Name,
                    FPMathTag);
}

CallInst *CreateCall(FunctionCallee Callee, ArrayRef<Value *> Args,
                     ArrayRef<OperandBundleDef> OpBundles,
                     const Twine &Name = "", MDNode *FPMathTag = nullptr) {
  return CreateCall(Callee.getFunctionType(), Callee.getCallee(), Args,
                    OpBundles, Name, FPMathTag);
}

// Deprecated [opaque pointer types]
CallInst *CreateCall(Value *Callee, ArrayRef<Value *> Args = None,
                     const Twine &Name = "", MDNode *FPMathTag = nullptr) {
  return CreateCall(
      cast<FunctionType>(Callee->getType()->getPointerElementType()), Callee,
      Args, Name, FPMathTag);
}

// Deprecated [opaque pointer types]
CallInst *CreateCall(Value *Callee, ArrayRef<Value *> Args,
                     ArrayRef<OperandBundleDef> OpBundles,
                     const Twine &Name = "", MDNode *FPMathTag = nullptr) {
  return CreateCall(
      cast<FunctionType>(Callee->getType()->getPointerElementType()), Callee,
      Args, OpBundles, Name, FPMathTag);
}

Value *CreateSelect(Value *C, Value *True, Value *False,
                    const Twine &Name = "", Instruction *MDFrom = nullptr) {
  if (auto *CC = dyn_cast<Constant>(C))
    if (auto *TC = dyn_cast<Constant>(True))
      if (auto *FC = dyn_cast<Constant>(False))
        return Insert(Folder.CreateSelect(CC, TC, FC), Name);

  SelectInst *Sel = SelectInst::Create(C, True, False);
  if (MDFrom) {
    MDNode *Prof = MDFrom->getMetadata(LLVMContext::MD_prof);
    MDNode *Unpred = MDFrom->getMetadata(LLVMContext::MD_unpredictable);
    Sel = addBranchMetadata(Sel, Prof, Unpred);
  }
  if (isa<FPMathOperator>(Sel))
    setFPAttrs(Sel, nullptr /* MDNode* */, FMF);
  return Insert(Sel, Name);
}

VAArgInst *CreateVAArg(Value *List, Type *Ty, const Twine &Name = "") {
  return Insert(new VAArgInst(List, Ty), Name);
}

Value *CreateExtractElement(Value *Vec, Value *Idx,
                            const Twine &Name = "") {
  if (auto *VC = dyn_cast<Constant>(Vec))
    if (auto *IC = dyn_cast<Constant>(Idx))
      return Insert(Folder.CreateExtractElement(VC, IC), Name);
  return Insert(ExtractElementInst::Create(Vec, Idx), Name);
}

Value *CreateExtractElement(Value *Vec, uint64_t Idx,
                            const Twine &Name = "") {
  return CreateExtractElement(Vec, getInt64(Idx), Name);
}

Value *CreateInsertElement(Value *Vec, Value *NewElt, Value *Idx,
                           const Twine &Name = "") {
  if (auto *VC = dyn_cast<Constant>(Vec))
    if (auto *NC = dyn_cast<Constant>(NewElt))
      if (auto *IC = dyn_cast<Constant>(Idx))
        return Insert(Folder.CreateInsertElement(VC, NC, IC), Name);
  return Insert(InsertElementInst::Create(Vec, NewElt, Idx), Name);
}

Value *CreateInsertElement(Value *Vec, Value *NewElt, uint64_t Idx,
                           const Twine &Name = "") {
  return CreateInsertElement(Vec, NewElt, getInt64(Idx), Name);
}

Value *CreateShuffleVector(Value *V1, Value *V2, Value *Mask,
                           const Twine &Name = "") {
  if (auto *V1C = dyn_cast<Constant>(V1))
    if (auto *V2C = dyn_cast<Constant>(V2))
      if (auto *MC = dyn_cast<Constant>(Mask))
        return Insert(Folder.CreateShuffleVector(V1C, V2C, MC), Name);
  return Insert(new ShuffleVectorInst(V1, V2, Mask), Name);
}

Value *CreateShuffleVector(Value *V1, Value *V2, ArrayRef<uint32_t> IntMask,
                           const Twine &Name = "") {
  Value *Mask = ConstantDataVector::get(Context, IntMask);
  return CreateShuffleVector(V1, V2, Mask, Name);
}

Value *CreateExtractValue(Value *Agg,
                          ArrayRef<unsigned> Idxs,
                          const Twine &Name = "") {
  if (auto *AggC = dyn_cast<Constant>(Agg))
    return Insert(Folder.CreateExtractValue(AggC, Idxs), Name);
  return Insert(ExtractValueInst::Create(Agg, Idxs), Name);
}

Value *CreateInsertValue(Value *Agg, Value *Val,
                         ArrayRef<unsigned> Idxs,
                         const Twine &Name = "") {
  if (auto *AggC = dyn_cast<Constant>(Agg))
    if (auto *ValC = dyn_cast<Constant>(Val))
      return Insert(Folder.CreateInsertValue(AggC, ValC, Idxs), Name);
  return Insert(InsertValueInst::Create(Agg, Val, Idxs), Name);
}

LandingPadInst *CreateLandingPad(Type *Ty, unsigned NumClauses,
                                 const Twine &Name = "") {
  return Insert(LandingPadInst::Create(Ty, NumClauses), Name);
}

Value *CreateFreeze(Value *V, const Twine &Name = "") {
  return Insert(UnaryOperator::CreateFreeze(V, Name));
}

//===--------------------------------------------------------------------===//
// Utility creation methods
//===--------------------------------------------------------------------===//

/// Return an i1 value testing if \p Arg is null.
Value *CreateIsNull(Value *Arg, const Twine &Name = "") {
  return CreateICmpEQ(Arg, Constant::getNullValue(Arg->getType()),
                      Name);
}

/// Return an i1 value testing if \p Arg is not null.
Value *CreateIsNotNull(Value *Arg, const Twine &Name = "") {
  return CreateICmpNE(Arg, Constant::getNullValue(Arg->getType()),
                      Name);
}

/// Return the i64 difference between two pointer values, dividing out
/// the size of the pointed-to objects.
///
/// This is intended to implement C-style pointer subtraction. As such, the
/// pointers must be appropriately aligned for their element types and
/// pointing into the same object.
Value *CreatePtrDiff(Value *LHS, Value *RHS, const Twine &Name = "") {
  assert(LHS->getType() == RHS->getType() &&((LHS->getType() == RHS->getType() && "Pointer subtraction operand types must match!"
) ? static_cast<void> (0) : __assert_fail ("LHS->getType() == RHS->getType() && \"Pointer subtraction operand types must match!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2423, __PRETTY_FUNCTION__))
         "Pointer subtraction operand types must match!")((LHS->getType() == RHS->getType() && "Pointer subtraction operand types must match!"
) ? static_cast<void> (0) : __assert_fail ("LHS->getType() == RHS->getType() && \"Pointer subtraction operand types must match!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2423, __PRETTY_FUNCTION__));
  auto *ArgType = cast<PointerType>(LHS->getType());
  Value *LHS_int = CreatePtrToInt(LHS, Type::getInt64Ty(Context));
  Value *RHS_int = CreatePtrToInt(RHS, Type::getInt64Ty(Context));
  Value *Difference = CreateSub(LHS_int, RHS_int);
  return CreateExactSDiv(Difference,
                         ConstantExpr::getSizeOf(ArgType->getElementType()),
                         Name);
}

/// Create a launder.invariant.group intrinsic call. If Ptr type is
/// different from pointer to i8, it's casted to pointer to i8 in the same
/// address space before call and casted back to Ptr type after call.
Value *CreateLaunderInvariantGroup(Value *Ptr) {
  assert(isa<PointerType>(Ptr->getType()) &&((isa<PointerType>(Ptr->getType()) && "launder.invariant.group only applies to pointers."
) ? static_cast<void> (0) : __assert_fail ("isa<PointerType>(Ptr->getType()) && \"launder.invariant.group only applies to pointers.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2438, __PRETTY_FUNCTION__))
         "launder.invariant.group only applies to pointers.")((isa<PointerType>(Ptr->getType()) && "launder.invariant.group only applies to pointers."
) ? static_cast<void> (0) : __assert_fail ("isa<PointerType>(Ptr->getType()) && \"launder.invariant.group only applies to pointers.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2438, __PRETTY_FUNCTION__));
  // FIXME: we could potentially avoid casts to/from i8*.
  auto *PtrType = Ptr->getType();
  auto *Int8PtrTy = getInt8PtrTy(PtrType->getPointerAddressSpace());
  if (PtrType != Int8PtrTy)
    Ptr = CreateBitCast(Ptr, Int8PtrTy);
  Module *M = BB->getParent()->getParent();
  Function *FnLaunderInvariantGroup = Intrinsic::getDeclaration(
      M, Intrinsic::launder_invariant_group, {Int8PtrTy});

  assert(FnLaunderInvariantGroup->getReturnType() == Int8PtrTy &&((FnLaunderInvariantGroup->getReturnType() == Int8PtrTy &&
 FnLaunderInvariantGroup->getFunctionType()->getParamType
(0) == Int8PtrTy && "LaunderInvariantGroup should take and return the same type"
) ? static_cast<void> (0) : __assert_fail ("FnLaunderInvariantGroup->getReturnType() == Int8PtrTy && FnLaunderInvariantGroup->getFunctionType()->getParamType(0) == Int8PtrTy && \"LaunderInvariantGroup should take and return the same type\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2451, __PRETTY_FUNCTION__))
         FnLaunderInvariantGroup->getFunctionType()->getParamType(0) ==((FnLaunderInvariantGroup->getReturnType() == Int8PtrTy &&
 FnLaunderInvariantGroup->getFunctionType()->getParamType
(0) == Int8PtrTy && "LaunderInvariantGroup should take and return the same type"
) ? static_cast<void> (0) : __assert_fail ("FnLaunderInvariantGroup->getReturnType() == Int8PtrTy && FnLaunderInvariantGroup->getFunctionType()->getParamType(0) == Int8PtrTy && \"LaunderInvariantGroup should take and return the same type\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2451, __PRETTY_FUNCTION__))
             Int8PtrTy &&((FnLaunderInvariantGroup->getReturnType() == Int8PtrTy &&
 FnLaunderInvariantGroup->getFunctionType()->getParamType
(0) == Int8PtrTy && "LaunderInvariantGroup should take and return the same type"
) ? static_cast<void> (0) : __assert_fail ("FnLaunderInvariantGroup->getReturnType() == Int8PtrTy && FnLaunderInvariantGroup->getFunctionType()->getParamType(0) == Int8PtrTy && \"LaunderInvariantGroup should take and return the same type\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2451, __PRETTY_FUNCTION__))
         "LaunderInvariantGroup should take and return the same type")((FnLaunderInvariantGroup->getReturnType() == Int8PtrTy &&
 FnLaunderInvariantGroup->getFunctionType()->getParamType
(0) == Int8PtrTy && "LaunderInvariantGroup should take and return the same type"
) ? static_cast<void> (0) : __assert_fail ("FnLaunderInvariantGroup->getReturnType() == Int8PtrTy && FnLaunderInvariantGroup->getFunctionType()->getParamType(0) == Int8PtrTy && \"LaunderInvariantGroup should take and return the same type\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2451, __PRETTY_FUNCTION__));

  CallInst *Fn = CreateCall(FnLaunderInvariantGroup, {Ptr});

  if (PtrType != Int8PtrTy)
    return CreateBitCast(Fn, PtrType);
  return Fn;
}

/// \brief Create a strip.invariant.group intrinsic call. If Ptr type is
/// different from pointer to i8, it's casted to pointer to i8 in the same
/// address space before call and casted back to Ptr type after call.
Value *CreateStripInvariantGroup(Value *Ptr) {
  assert(isa<PointerType>(Ptr->getType()) &&((isa<PointerType>(Ptr->getType()) && "strip.invariant.group only applies to pointers."
) ? static_cast<void> (0) : __assert_fail ("isa<PointerType>(Ptr->getType()) && \"strip.invariant.group only applies to pointers.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2465, __PRETTY_FUNCTION__))
         "strip.invariant.group only applies to pointers.")((isa<PointerType>(Ptr->getType()) && "strip.invariant.group only applies to pointers."
) ? static_cast<void> (0) : __assert_fail ("isa<PointerType>(Ptr->getType()) && \"strip.invariant.group only applies to pointers.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2465, __PRETTY_FUNCTION__));

  // FIXME: we could potentially avoid casts to/from i8*.
  auto *PtrType = Ptr->getType();
  auto *Int8PtrTy = getInt8PtrTy(PtrType->getPointerAddressSpace());
  if (PtrType != Int8PtrTy)
    Ptr = CreateBitCast(Ptr, Int8PtrTy);
  Module *M = BB->getParent()->getParent();
  Function *FnStripInvariantGroup = Intrinsic::getDeclaration(
      M, Intrinsic::strip_invariant_group, {Int8PtrTy});

  assert(FnStripInvariantGroup->getReturnType() == Int8PtrTy &&((FnStripInvariantGroup->getReturnType() == Int8PtrTy &&
 FnStripInvariantGroup->getFunctionType()->getParamType
(0) == Int8PtrTy && "StripInvariantGroup should take and return the same type"
) ? static_cast<void> (0) : __assert_fail ("FnStripInvariantGroup->getReturnType() == Int8PtrTy && FnStripInvariantGroup->getFunctionType()->getParamType(0) == Int8PtrTy && \"StripInvariantGroup should take and return the same type\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2479, __PRETTY_FUNCTION__))
         FnStripInvariantGroup->getFunctionType()->getParamType(0) ==((FnStripInvariantGroup->getReturnType() == Int8PtrTy &&
 FnStripInvariantGroup->getFunctionType()->getParamType
(0) == Int8PtrTy && "StripInvariantGroup should take and return the same type"
) ? static_cast<void> (0) : __assert_fail ("FnStripInvariantGroup->getReturnType() == Int8PtrTy && FnStripInvariantGroup->getFunctionType()->getParamType(0) == Int8PtrTy && \"StripInvariantGroup should take and return the same type\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2479, __PRETTY_FUNCTION__))
             Int8PtrTy &&((FnStripInvariantGroup->getReturnType() == Int8PtrTy &&
 FnStripInvariantGroup->getFunctionType()->getParamType
(0) == Int8PtrTy && "StripInvariantGroup should take and return the same type"
) ? static_cast<void> (0) : __assert_fail ("FnStripInvariantGroup->getReturnType() == Int8PtrTy && FnStripInvariantGroup->getFunctionType()->getParamType(0) == Int8PtrTy && \"StripInvariantGroup should take and return the same type\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2479, __PRETTY_FUNCTION__))
         "StripInvariantGroup should take and return the same type")((FnStripInvariantGroup->getReturnType() == Int8PtrTy &&
 FnStripInvariantGroup->getFunctionType()->getParamType
(0) == Int8PtrTy && "StripInvariantGroup should take and return the same type"
) ? static_cast<void> (0) : __assert_fail ("FnStripInvariantGroup->getReturnType() == Int8PtrTy && FnStripInvariantGroup->getFunctionType()->getParamType(0) == Int8PtrTy && \"StripInvariantGroup should take and return the same type\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2479, __PRETTY_FUNCTION__));

  CallInst *Fn = CreateCall(FnStripInvariantGroup, {Ptr});

  if (PtrType != Int8PtrTy)
    return CreateBitCast(Fn, PtrType);
  return Fn;
}

/// Return a vector value that contains \arg V broadcasted to \p
/// NumElts elements.
Value *CreateVectorSplat(unsigned NumElts, Value *V, const Twine &Name = "") {
  assert(NumElts > 0 && "Cannot splat to an empty vector!")((NumElts > 0 && "Cannot splat to an empty vector!"
) ? static_cast<void> (0) : __assert_fail ("NumElts > 0 && \"Cannot splat to an empty vector!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2491, __PRETTY_FUNCTION__));

  // First insert it into an undef vector so we can shuffle it.
  Type *I32Ty = getInt32Ty();
  Value *Undef = UndefValue::get(VectorType::get(V->getType(), NumElts));
  V = CreateInsertElement(Undef, V, ConstantInt::get(I32Ty, 0),
                          Name + ".splatinsert");

  // Shuffle the value across the desired number of elements.
  Value *Zeros = ConstantAggregateZero::get(VectorType::get(I32Ty, NumElts));
  return CreateShuffleVector(V, Undef, Zeros, Name + ".splat");
}

/// Return a value that has been extracted from a larger integer type.
Value *CreateExtractInteger(const DataLayout &DL, Value *From,
                            IntegerType *ExtractedTy, uint64_t Offset,
                            const Twine &Name) {
  auto *IntTy = cast<IntegerType>(From->getType());
  assert(DL.getTypeStoreSize(ExtractedTy) + Offset <=((DL.getTypeStoreSize(ExtractedTy) + Offset <= DL.getTypeStoreSize
(IntTy) && "Element extends past full value") ? static_cast
<void> (0) : __assert_fail ("DL.getTypeStoreSize(ExtractedTy) + Offset <= DL.getTypeStoreSize(IntTy) && \"Element extends past full value\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2511, __PRETTY_FUNCTION__))
             DL.getTypeStoreSize(IntTy) &&((DL.getTypeStoreSize(ExtractedTy) + Offset <= DL.getTypeStoreSize
(IntTy) && "Element extends past full value") ? static_cast
<void> (0) : __assert_fail ("DL.getTypeStoreSize(ExtractedTy) + Offset <= DL.getTypeStoreSize(IntTy) && \"Element extends past full value\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2511, __PRETTY_FUNCTION__))
         "Element extends past full value")((DL.getTypeStoreSize(ExtractedTy) + Offset <= DL.getTypeStoreSize
(IntTy) && "Element extends past full value") ? static_cast
<void> (0) : __assert_fail ("DL.getTypeStoreSize(ExtractedTy) + Offset <= DL.getTypeStoreSize(IntTy) && \"Element extends past full value\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2511, __PRETTY_FUNCTION__));
  uint64_t ShAmt = 8 * Offset;
  Value *V = From;
  if (DL.isBigEndian())
    ShAmt = 8 * (DL.getTypeStoreSize(IntTy) -
                 DL.getTypeStoreSize(ExtractedTy) - Offset);
  if (ShAmt) {
    V = CreateLShr(V, ShAmt, Name + ".shift");
  }
  assert(ExtractedTy->getBitWidth() <= IntTy->getBitWidth() &&((ExtractedTy->getBitWidth() <= IntTy->getBitWidth()
 && "Cannot extract to a larger integer!") ? static_cast
<void> (0) : __assert_fail ("ExtractedTy->getBitWidth() <= IntTy->getBitWidth() && \"Cannot extract to a larger integer!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2521, __PRETTY_FUNCTION__))
         "Cannot extract to a larger integer!")((ExtractedTy->getBitWidth() <= IntTy->getBitWidth()
 && "Cannot extract to a larger integer!") ? static_cast
<void> (0) : __assert_fail ("ExtractedTy->getBitWidth() <= IntTy->getBitWidth() && \"Cannot extract to a larger integer!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2521, __PRETTY_FUNCTION__));
  if (ExtractedTy != IntTy) {
    V = CreateTrunc(V, ExtractedTy, Name + ".trunc");
  }
  return V;
}

Value *CreatePreserveArrayAccessIndex(Type *ElTy, Value *Base,
                                      unsigned Dimension, unsigned LastIndex,
                                      MDNode *DbgInfo) {
  assert(isa<PointerType>(Base->getType()) &&((isa<PointerType>(Base->getType()) && "Invalid Base ptr type for preserve.array.access.index."
) ? static_cast<void> (0) : __assert_fail ("isa<PointerType>(Base->getType()) && \"Invalid Base ptr type for preserve.array.access.index.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2532, __PRETTY_FUNCTION__))
         "Invalid Base ptr type for preserve.array.access.index.")((isa<PointerType>(Base->getType()) && "Invalid Base ptr type for preserve.array.access.index."
) ? static_cast<void> (0) : __assert_fail ("isa<PointerType>(Base->getType()) && \"Invalid Base ptr type for preserve.array.access.index.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2532, __PRETTY_FUNCTION__));
  auto *BaseType = Base->getType();

  Value *LastIndexV = getInt32(LastIndex);
  Constant *Zero = ConstantInt::get(Type::getInt32Ty(Context), 0);
  SmallVector<Value *, 4> IdxList;
  for (unsigned I = 0; I < Dimension; ++I)
    IdxList.push_back(Zero);
  IdxList.push_back(LastIndexV);

  Type *ResultType =
      GetElementPtrInst::getGEPReturnType(ElTy, Base, IdxList);

  Module *M = BB->getParent()->getParent();
  Function *FnPreserveArrayAccessIndex = Intrinsic::getDeclaration(
      M, Intrinsic::preserve_array_access_index, {ResultType, BaseType});

  Value *DimV = getInt32(Dimension);
  CallInst *Fn =
      CreateCall(FnPreserveArrayAccessIndex, {Base, DimV, LastIndexV});
  if (DbgInfo)
    Fn->setMetadata(LLVMContext::MD_preserve_access_index, DbgInfo);

  return Fn;
}

Value *CreatePreserveUnionAccessIndex(Value *Base, unsigned FieldIndex,
                                      MDNode *DbgInfo) {
  assert(isa<PointerType>(Base->getType()) &&((isa<PointerType>(Base->getType()) && "Invalid Base ptr type for preserve.union.access.index."
) ? static_cast<void> (0) : __assert_fail ("isa<PointerType>(Base->getType()) && \"Invalid Base ptr type for preserve.union.access.index.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2561, __PRETTY_FUNCTION__))
         "Invalid Base ptr type for preserve.union.access.index.")((isa<PointerType>(Base->getType()) && "Invalid Base ptr type for preserve.union.access.index."
) ? static_cast<void> (0) : __assert_fail ("isa<PointerType>(Base->getType()) && \"Invalid Base ptr type for preserve.union.access.index.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2561, __PRETTY_FUNCTION__));
  auto *BaseType = Base->getType();

  Module *M = BB->getParent()->getParent();
  Function *FnPreserveUnionAccessIndex = Intrinsic::getDeclaration(
      M, Intrinsic::preserve_union_access_index, {BaseType, BaseType});

  Value *DIIndex = getInt32(FieldIndex);
  CallInst *Fn =
      CreateCall(FnPreserveUnionAccessIndex, {Base, DIIndex});
  if (DbgInfo)
    Fn->setMetadata(LLVMContext::MD_preserve_access_index, DbgInfo);

  return Fn;
}

Value *CreatePreserveStructAccessIndex(Type *ElTy, Value *Base,
                                       unsigned Index, unsigned FieldIndex,
                                       MDNode *DbgInfo) {
  assert(isa<PointerType>(Base->getType()) &&((isa<PointerType>(Base->getType()) && "Invalid Base ptr type for preserve.struct.access.index."
) ? static_cast<void> (0) : __assert_fail ("isa<PointerType>(Base->getType()) && \"Invalid Base ptr type for preserve.struct.access.index.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2581, __PRETTY_FUNCTION__))
         "Invalid Base ptr type for preserve.struct.access.index.")((isa<PointerType>(Base->getType()) && "Invalid Base ptr type for preserve.struct.access.index."
) ? static_cast<void> (0) : __assert_fail ("isa<PointerType>(Base->getType()) && \"Invalid Base ptr type for preserve.struct.access.index.\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2581, __PRETTY_FUNCTION__));
  auto *BaseType = Base->getType();

  Value *GEPIndex = getInt32(Index);
  Constant *Zero = ConstantInt::get(Type::getInt32Ty(Context), 0);
  Type *ResultType =
      GetElementPtrInst::getGEPReturnType(ElTy, Base, {Zero, GEPIndex});

  Module *M = BB->getParent()->getParent();
  Function *FnPreserveStructAccessIndex = Intrinsic::getDeclaration(
      M, Intrinsic::preserve_struct_access_index, {ResultType, BaseType});

  Value *DIIndex = getInt32(FieldIndex);
  CallInst *Fn = CreateCall(FnPreserveStructAccessIndex,
                            {Base, GEPIndex, DIIndex});
  if (DbgInfo)
    Fn->setMetadata(LLVMContext::MD_preserve_access_index, DbgInfo);

  return Fn;
}

2602private:
/// Helper function that creates an assume intrinsic call that
/// represents an alignment assumption on the provided Ptr, Mask, Type
/// and Offset. It may be sometimes useful to do some other logic
/// based on this alignment check, thus it can be stored into 'TheCheck'.
CallInst *CreateAlignmentAssumptionHelper(const DataLayout &DL,
                                          Value *PtrValue, Value *Mask,
                                          Type *IntPtrTy, Value *OffsetValue,
                                          Value **TheCheck) {
  Value *PtrIntValue = CreatePtrToInt(PtrValue, IntPtrTy, "ptrint");

  if (OffsetValue) {
    bool IsOffsetZero = false;
    if (const auto *CI = dyn_cast<ConstantInt>(OffsetValue))
      IsOffsetZero = CI->isZero();

    if (!IsOffsetZero) {
      if (OffsetValue->getType() != IntPtrTy)
        OffsetValue = CreateIntCast(OffsetValue, IntPtrTy, /*isSigned*/ true,
                                    "offsetcast");
      PtrIntValue = CreateSub(PtrIntValue, OffsetValue, "offsetptr");
    }
  }

  Value *Zero = ConstantInt::get(IntPtrTy, 0);
  Value *MaskedPtr = CreateAnd(PtrIntValue, Mask, "maskedptr");
  Value *InvCond = CreateICmpEQ(MaskedPtr, Zero, "maskcond");
  if (TheCheck)
    *TheCheck = InvCond;

  return CreateAssumption(InvCond);
}

2635public:
/// Create an assume intrinsic call that represents an alignment
/// assumption on the provided pointer.
///
/// An optional offset can be provided, and if it is provided, the offset
/// must be subtracted from the provided pointer to get the pointer with the
/// specified alignment.
///
/// It may be sometimes useful to do some other logic
/// based on this alignment check, thus it can be stored into 'TheCheck'.
CallInst *CreateAlignmentAssumption(const DataLayout &DL, Value *PtrValue,
                                    unsigned Alignment,
                                    Value *OffsetValue = nullptr,
                                    Value **TheCheck = nullptr) {
  assert(isa<PointerType>(PtrValue->getType()) &&((isa<PointerType>(PtrValue->getType()) && "trying to create an alignment assumption on a non-pointer?"
) ? static_cast<void> (0) : __assert_fail ("isa<PointerType>(PtrValue->getType()) && \"trying to create an alignment assumption on a non-pointer?\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2650, __PRETTY_FUNCTION__))
         "trying to create an alignment assumption on a non-pointer?")((isa<PointerType>(PtrValue->getType()) && "trying to create an alignment assumption on a non-pointer?"
) ? static_cast<void> (0) : __assert_fail ("isa<PointerType>(PtrValue->getType()) && \"trying to create an alignment assumption on a non-pointer?\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2650, __PRETTY_FUNCTION__));
  assert(Alignment != 0 && "Invalid Alignment")((Alignment != 0 && "Invalid Alignment") ? static_cast
<void> (0) : __assert_fail ("Alignment != 0 && \"Invalid Alignment\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2651, __PRETTY_FUNCTION__));
  auto *PtrTy = cast<PointerType>(PtrValue->getType());
  Type *IntPtrTy = getIntPtrTy(DL, PtrTy->getAddressSpace());

  Value *Mask = ConstantInt::get(IntPtrTy, Alignment - 1);
  return CreateAlignmentAssumptionHelper(DL, PtrValue, Mask, IntPtrTy,
                                         OffsetValue, TheCheck);
}

/// Create an assume intrinsic call that represents an alignment
/// assumption on the provided pointer.
///
/// An optional offset can be provided, and if it is provided, the offset
/// must be subtracted from the provided pointer to get the pointer with the
/// specified alignment.
///
/// It may be sometimes useful to do some other logic
/// based on this alignment check, thus it can be stored into 'TheCheck'.
///
/// This overload handles the condition where the Alignment is dependent
/// on an existing value rather than a static value.
CallInst *CreateAlignmentAssumption(const DataLayout &DL, Value *PtrValue,
                                    Value *Alignment,
                                    Value *OffsetValue = nullptr,
                                    Value **TheCheck = nullptr) {
  assert(isa<PointerType>(PtrValue->getType()) &&((isa<PointerType>(PtrValue->getType()) && "trying to create an alignment assumption on a non-pointer?"
) ? static_cast<void> (0) : __assert_fail ("isa<PointerType>(PtrValue->getType()) && \"trying to create an alignment assumption on a non-pointer?\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2677, __PRETTY_FUNCTION__))
         "trying to create an alignment assumption on a non-pointer?")((isa<PointerType>(PtrValue->getType()) && "trying to create an alignment assumption on a non-pointer?"
) ? static_cast<void> (0) : __assert_fail ("isa<PointerType>(PtrValue->getType()) && \"trying to create an alignment assumption on a non-pointer?\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/IR/IRBuilder.h"
, 2677, __PRETTY_FUNCTION__));
  auto *PtrTy = cast<PointerType>(PtrValue->getType());
  Type *IntPtrTy = getIntPtrTy(DL, PtrTy->getAddressSpace());

  if (Alignment->getType() != IntPtrTy)
    Alignment = CreateIntCast(Alignment, IntPtrTy, /*isSigned*/ false,
                              "alignmentcast");

  Value *Mask = CreateSub(Alignment, ConstantInt::get(IntPtrTy, 1), "mask");

  return CreateAlignmentAssumptionHelper(DL, PtrValue, Mask, IntPtrTy,
                                         OffsetValue, TheCheck);
}
2690};

2692// Create wrappers for C Binding types (see CBindingWrapping.h).
2693DEFINE_SIMPLE_CONVERSION_FUNCTIONS(IRBuilder<>, LLVMBuilderRef)inline IRBuilder<> *unwrap(LLVMBuilderRef P) { return reinterpret_cast
<IRBuilder<>*>(P); } inline LLVMBuilderRef wrap(const
 IRBuilder<> *P) { return reinterpret_cast<LLVMBuilderRef
>(const_cast<IRBuilder<>*>(P)); }

2695} // end namespace llvm

2697#endif // LLVM_IR_IRBUILDER_H

←

/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/ADT/Twine.h

1//===- Twine.h - Fast Temporary String Concatenation ------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//

9#ifndef LLVM_ADT_TWINE_H
10#define LLVM_ADT_TWINE_H

12#include "llvm/ADT/SmallVector.h"
13#include "llvm/ADT/StringRef.h"
14#include "llvm/Support/ErrorHandling.h"
15#include <cassert>
16#include <cstdint>
17#include <string>

19namespace llvm {

class formatv_object_base;
class raw_ostream;

/// Twine - A lightweight data structure for efficiently representing the
/// concatenation of temporary values as strings.
///
/// A Twine is a kind of rope, it represents a concatenated string using a
/// binary-tree, where the string is the preorder of the nodes. Since the
/// Twine can be efficiently rendered into a buffer when its result is used,
/// it avoids the cost of generating temporary values for intermediate string
/// results -- particularly in cases when the Twine result is never
/// required. By explicitly tracking the type of leaf nodes, we can also avoid
/// the creation of temporary strings for conversions operations (such as
/// appending an integer to a string).
///
/// A Twine is not intended for use directly and should not be stored, its
/// implementation relies on the ability to store pointers to temporary stack
/// objects which may be deallocated at the end of a statement. Twines should
/// only be used accepted as const references in arguments, when an API wishes
/// to accept possibly-concatenated strings.
///
/// Twines support a special 'null' value, which always concatenates to form
/// itself, and renders as an empty string. This can be returned from APIs to
/// effectively nullify any concatenations performed on the result.
///
/// \b Implementation
///
/// Given the nature of a Twine, it is not possible for the Twine's
/// concatenation method to construct interior nodes; the result must be
/// represented inside the returned value. For this reason a Twine object
/// actually holds two values, the left- and right-hand sides of a
/// concatenation. We also have nullary Twine objects, which are effectively
/// sentinel values that represent empty strings.
///
/// Thus, a Twine can effectively have zero, one, or two children. The \see
/// isNullary(), \see isUnary(), and \see isBinary() predicates exist for
/// testing the number of children.
///
/// We maintain a number of invariants on Twine objects (FIXME: Why):
///  - Nullary twines are always represented with their Kind on the left-hand
///    side, and the Empty kind on the right-hand side.
///  - Unary twines are always represented with the value on the left-hand
///    side, and the Empty kind on the right-hand side.
///  - If a Twine has another Twine as a child, that child should always be
///    binary (otherwise it could have been folded into the parent).
///
/// These invariants are check by \see isValid().
///
/// \b Efficiency Considerations
///
/// The Twine is designed to yield efficient and small code for common
/// situations. For this reason, the concat() method is inlined so that
/// concatenations of leaf nodes can be optimized into stores directly into a
/// single stack allocated object.
///
/// In practice, not all compilers can be trusted to optimize concat() fully,
/// so we provide two additional methods (and accompanying operator+
/// overloads) to guarantee that particularly important cases (cstring plus
/// StringRef) codegen as desired.
class Twine {
  /// NodeKind - Represent the type of an argument.
  enum NodeKind : unsigned char {
    /// An empty string; the result of concatenating anything with it is also
    /// empty.
    NullKind,

    /// The empty string.
    EmptyKind,

    /// A pointer to a Twine instance.
    TwineKind,

    /// A pointer to a C string instance.
    CStringKind,

    /// A pointer to an std::string instance.
    StdStringKind,

    /// A pointer to a StringRef instance.
    StringRefKind,

    /// A pointer to a SmallString instance.
    SmallStringKind,

    /// A pointer to a formatv_object_base instance.
    FormatvObjectKind,

    /// A char value, to render as a character.
    CharKind,

    /// An unsigned int value, to render as an unsigned decimal integer.
    DecUIKind,

    /// An int value, to render as a signed decimal integer.
    DecIKind,

    /// A pointer to an unsigned long value, to render as an unsigned decimal
    /// integer.
    DecULKind,

    /// A pointer to a long value, to render as a signed decimal integer.
    DecLKind,

    /// A pointer to an unsigned long long value, to render as an unsigned
    /// decimal integer.
    DecULLKind,

    /// A pointer to a long long value, to render as a signed decimal integer.
    DecLLKind,

    /// A pointer to a uint64_t value, to render as an unsigned hexadecimal
    /// integer.
    UHexKind
  };

  union Child
  {
    const Twine *twine;
    const char *cString;
    const std::string *stdString;
    const StringRef *stringRef;
    const SmallVectorImpl<char> *smallString;
    const formatv_object_base *formatvObject;
    char character;
    unsigned int decUI;
    int decI;
    const unsigned long *decUL;
    const long *decL;
    const unsigned long long *decULL;
    const long long *decLL;
    const uint64_t *uHex;
  };

  /// LHS - The prefix in the concatenation, which may be uninitialized for
  /// Null or Empty kinds.
  Child LHS = {0};

  /// RHS - The suffix in the concatenation, which may be uninitialized for
  /// Null or Empty kinds.
  Child RHS = {0};

  /// LHSKind - The NodeKind of the left hand side, \see getLHSKind().
  NodeKind LHSKind = EmptyKind;

  /// RHSKind - The NodeKind of the right hand side, \see getRHSKind().
  NodeKind RHSKind = EmptyKind;

  /// Construct a nullary twine; the kind must be NullKind or EmptyKind.
  explicit Twine(NodeKind Kind) : LHSKind(Kind) {
    assert(isNullary() && "Invalid kind!")((isNullary() && "Invalid kind!") ? static_cast<void
> (0) : __assert_fail ("isNullary() && \"Invalid kind!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/ADT/Twine.h"
, 170, __PRETTY_FUNCTION__));
  }

  /// Construct a binary twine.
  explicit Twine(const Twine &LHS, const Twine &RHS)
      : LHSKind(TwineKind), RHSKind(TwineKind) {
    this->LHS.twine = &LHS;
    this->RHS.twine = &RHS;
    assert(isValid() && "Invalid twine!")((isValid() && "Invalid twine!") ? static_cast<void
> (0) : __assert_fail ("isValid() && \"Invalid twine!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/ADT/Twine.h"
, 178, __PRETTY_FUNCTION__));
  }

  /// Construct a twine from explicit values.
  explicit Twine(Child LHS, NodeKind LHSKind, Child RHS, NodeKind RHSKind)
      : LHS(LHS), RHS(RHS), LHSKind(LHSKind), RHSKind(RHSKind) {
    assert(isValid() && "Invalid twine!")((isValid() && "Invalid twine!") ? static_cast<void
> (0) : __assert_fail ("isValid() && \"Invalid twine!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/ADT/Twine.h"
, 184, __PRETTY_FUNCTION__));
  }

  /// Check for the null twine.
  bool isNull() const {
    return getLHSKind() == NullKind;
  }

  /// Check for the empty twine.
  bool isEmpty() const {
    return getLHSKind() == EmptyKind;
  }

  /// Check if this is a nullary twine (null or empty).
  bool isNullary() const {
    return isNull() || isEmpty();
  }

  /// Check if this is a unary twine.
  bool isUnary() const {
    return getRHSKind() == EmptyKind && !isNullary();
  }

  /// Check if this is a binary twine.
  bool isBinary() const {
    return getLHSKind() != NullKind && getRHSKind() != EmptyKind;
  }

  /// Check if this is a valid twine (satisfying the invariants on
  /// order and number of arguments).
  bool isValid() const {
    // Nullary twines always have Empty on the RHS.
    if (isNullary() && getRHSKind() != EmptyKind)
      return false;

    // Null should never appear on the RHS.
    if (getRHSKind() == NullKind)
      return false;

    // The RHS cannot be non-empty if the LHS is empty.
    if (getRHSKind() != EmptyKind && getLHSKind() == EmptyKind)
      return false;

    // A twine child should always be binary.
    if (getLHSKind() == TwineKind &&
        !LHS.twine->isBinary())
      return false;
    if (getRHSKind() == TwineKind &&
        !RHS.twine->isBinary())
      return false;

    return true;
  }

  /// Get the NodeKind of the left-hand side.
  NodeKind getLHSKind() const { return LHSKind; }

  /// Get the NodeKind of the right-hand side.
  NodeKind getRHSKind() const { return RHSKind; }

  /// Print one child from a twine.
  void printOneChild(raw_ostream &OS, Child Ptr, NodeKind Kind) const;

  /// Print the representation of one child from a twine.
  void printOneChildRepr(raw_ostream &OS, Child Ptr,
                         NodeKind Kind) const;

public:
  /// @name Constructors
  /// @{

  /// Construct from an empty string.
  /*implicit*/ Twine() {
    assert(isValid() && "Invalid twine!")((isValid() && "Invalid twine!") ? static_cast<void
> (0) : __assert_fail ("isValid() && \"Invalid twine!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/ADT/Twine.h"
, 257, __PRETTY_FUNCTION__));
  }

  Twine(const Twine &) = default;

  /// Construct from a C string.
  ///
  /// We take care here to optimize "" into the empty twine -- this will be
  /// optimized out for string constants. This allows Twine arguments have
  /// default "" values, without introducing unnecessary string constants.
  /*implicit*/ Twine(const char *Str) {
    if (Str[0] != '\0') {
      LHS.cString = Str;
      LHSKind = CStringKind;
    } else
      LHSKind = EmptyKind;

    assert(isValid() && "Invalid twine!")((isValid() && "Invalid twine!") ? static_cast<void
> (0) : __assert_fail ("isValid() && \"Invalid twine!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/ADT/Twine.h"
, 274, __PRETTY_FUNCTION__));
  }
  /// Delete the implicit conversion from nullptr as Twine(const char *)
  /// cannot take nullptr.
  /*implicit*/ Twine(std::nullptr_t) = delete;

  /// Construct from an std::string.
  /*implicit*/ Twine(const std::string &Str) : LHSKind(StdStringKind) {
    LHS.stdString = &Str;
    assert(isValid() && "Invalid twine!")((isValid() && "Invalid twine!") ? static_cast<void
> (0) : __assert_fail ("isValid() && \"Invalid twine!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/ADT/Twine.h"
, 283, __PRETTY_FUNCTION__));
  }

  /// Construct from a StringRef.
  /*implicit*/ Twine(const StringRef &Str) : LHSKind(StringRefKind) {
    LHS.stringRef = &Str;
    assert(isValid() && "Invalid twine!")((isValid() && "Invalid twine!") ? static_cast<void
> (0) : __assert_fail ("isValid() && \"Invalid twine!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/ADT/Twine.h"
, 289, __PRETTY_FUNCTION__));
  }

  /// Construct from a SmallString.
  /*implicit*/ Twine(const SmallVectorImpl<char> &Str)
      : LHSKind(SmallStringKind) {
    LHS.smallString = &Str;
    assert(isValid() && "Invalid twine!")((isValid() && "Invalid twine!") ? static_cast<void
> (0) : __assert_fail ("isValid() && \"Invalid twine!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/ADT/Twine.h"
, 296, __PRETTY_FUNCTION__));
  }

  /// Construct from a formatv_object_base.
  /*implicit*/ Twine(const formatv_object_base &Fmt)
      : LHSKind(FormatvObjectKind) {
    LHS.formatvObject = &Fmt;
    assert(isValid() && "Invalid twine!")((isValid() && "Invalid twine!") ? static_cast<void
> (0) : __assert_fail ("isValid() && \"Invalid twine!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/ADT/Twine.h"
, 303, __PRETTY_FUNCTION__));
  }

  /// Construct from a char.
  explicit Twine(char Val) : LHSKind(CharKind) {
    LHS.character = Val;
  }

  /// Construct from a signed char.
  explicit Twine(signed char Val) : LHSKind(CharKind) {
    LHS.character = static_cast<char>(Val);
  }

  /// Construct from an unsigned char.
  explicit Twine(unsigned char Val) : LHSKind(CharKind) {
    LHS.character = static_cast<char>(Val);
  }

  /// Construct a twine to print \p Val as an unsigned decimal integer.
  explicit Twine(unsigned Val) : LHSKind(DecUIKind) {
    LHS.decUI = Val;
  }

  /// Construct a twine to print \p Val as a signed decimal integer.
  explicit Twine(int Val) : LHSKind(DecIKind) {
    LHS.decI = Val;
  }

  /// Construct a twine to print \p Val as an unsigned decimal integer.
  explicit Twine(const unsigned long &Val) : LHSKind(DecULKind) {
    LHS.decUL = &Val;
  }

  /// Construct a twine to print \p Val as a signed decimal integer.
  explicit Twine(const long &Val) : LHSKind(DecLKind) {
    LHS.decL = &Val;
  }

  /// Construct a twine to print \p Val as an unsigned decimal integer.
  explicit Twine(const unsigned long long &Val) : LHSKind(DecULLKind) {
    LHS.decULL = &Val;
  }

  /// Construct a twine to print \p Val as a signed decimal integer.
  explicit Twine(const long long &Val) : LHSKind(DecLLKind) {
    LHS.decLL = &Val;
  }

  // FIXME: Unfortunately, to make sure this is as efficient as possible we
  // need extra binary constructors from particular types. We can't rely on
  // the compiler to be smart enough to fold operator+()/concat() down to the
  // right thing. Yet.

  /// Construct as the concatenation of a C string and a StringRef.
  /*implicit*/ Twine(const char *LHS, const StringRef &RHS)
      : LHSKind(CStringKind), RHSKind(StringRefKind) {
    this->LHS.cString = LHS;
    this->RHS.stringRef = &RHS;
    assert(isValid() && "Invalid twine!")((isValid() && "Invalid twine!") ? static_cast<void
> (0) : __assert_fail ("isValid() && \"Invalid twine!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/ADT/Twine.h"
, 361, __PRETTY_FUNCTION__));
  }

  /// Construct as the concatenation of a StringRef and a C string.
  /*implicit*/ Twine(const StringRef &LHS, const char *RHS)
      : LHSKind(StringRefKind), RHSKind(CStringKind) {
    this->LHS.stringRef = &LHS;
    this->RHS.cString = RHS;
    assert(isValid() && "Invalid twine!")((isValid() && "Invalid twine!") ? static_cast<void
> (0) : __assert_fail ("isValid() && \"Invalid twine!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/ADT/Twine.h"
, 369, __PRETTY_FUNCTION__));
  }

  /// Since the intended use of twines is as temporary objects, assignments
  /// when concatenating might cause undefined behavior or stack corruptions
  Twine &operator=(const Twine &) = delete;

  /// Create a 'null' string, which is an empty string that always
  /// concatenates to form another empty string.
  static Twine createNull() {
    return Twine(NullKind);
  }

  /// @}
  /// @name Numeric Conversions
  /// @{

  // Construct a twine to print \p Val as an unsigned hexadecimal integer.
  static Twine utohexstr(const uint64_t &Val) {
    Child LHS, RHS;
    LHS.uHex = &Val;
    RHS.twine = nullptr;
    return Twine(LHS, UHexKind, RHS, EmptyKind);
  }

  /// @}
  /// @name Predicate Operations
  /// @{

  /// Check if this twine is trivially empty; a false return value does not
  /// necessarily mean the twine is empty.
  bool isTriviallyEmpty() const {
    return isNullary();
  }

  /// Return true if this twine can be dynamically accessed as a single
  /// StringRef value with getSingleStringRef().
  bool isSingleStringRef() const {
    if (getRHSKind() != EmptyKind) return false;

    switch (getLHSKind()) {
    case EmptyKind:
    case CStringKind:
    case StdStringKind:
    case StringRefKind:
    case SmallStringKind:
      return true;
    default:
      return false;
    }
  }

  /// @}
  /// @name String Operations
  /// @{

  Twine concat(const Twine &Suffix) const;

  /// @}
  /// @name Output & Conversion.
  /// @{

  /// Return the twine contents as a std::string.
  std::string str() const;

  /// Append the concatenated string into the given SmallString or SmallVector.
  void toVector(SmallVectorImpl<char> &Out) const;

  /// This returns the twine as a single StringRef.  This method is only valid
  /// if isSingleStringRef() is true.
  StringRef getSingleStringRef() const {
    assert(isSingleStringRef() &&"This cannot be had as a single stringref!")((isSingleStringRef() &&"This cannot be had as a single stringref!"
) ? static_cast<void> (0) : __assert_fail ("isSingleStringRef() &&\"This cannot be had as a single stringref!\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/ADT/Twine.h"
, 440, __PRETTY_FUNCTION__));
    switch (getLHSKind()) {
    default: llvm_unreachable("Out of sync with isSingleStringRef")::llvm::llvm_unreachable_internal("Out of sync with isSingleStringRef"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/llvm/include/llvm/ADT/Twine.h"
, 442);
    case EmptyKind:      return StringRef();
    case CStringKind:    return StringRef(LHS.cString);
    case StdStringKind:  return StringRef(*LHS.stdString);
    case StringRefKind:  return *LHS.stringRef;
    case SmallStringKind:
      return StringRef(LHS.smallString->data(), LHS.smallString->size());
    }
  }

  /// This returns the twine as a single StringRef if it can be
  /// represented as such. Otherwise the twine is written into the given
  /// SmallVector and a StringRef to the SmallVector's data is returned.
  StringRef toStringRef(SmallVectorImpl<char> &Out) const {
    if (isSingleStringRef())
      return getSingleStringRef();
    toVector(Out);
    return StringRef(Out.data(), Out.size());
  }

  /// This returns the twine as a single null terminated StringRef if it
  /// can be represented as such. Otherwise the twine is written into the
  /// given SmallVector and a StringRef to the SmallVector's data is returned.
  ///
  /// The returned StringRef's size does not include the null terminator.
  StringRef toNullTerminatedStringRef(SmallVectorImpl<char> &Out) const;

  /// Write the concatenated string represented by this twine to the
  /// stream \p OS.
  void print(raw_ostream &OS) const;

  /// Dump the concatenated string represented by this twine to stderr.
  void dump() const;

  /// Write the representation of this twine to the stream \p OS.
  void printRepr(raw_ostream &OS) const;

  /// Dump the representation of this twine to stderr.
  void dumpRepr() const;

  /// @}
};

/// @name Twine Inline Implementations
/// @{

inline Twine Twine::concat(const Twine &Suffix) const {
  // Concatenation with null is null.
  if (isNull() || Suffix.isNull())
    return Twine(NullKind);

  // Concatenation with empty yields the other side.
  if (isEmpty())
    return Suffix;
  if (Suffix.isEmpty())
    return *this;

  // Otherwise we need to create a new node, taking care to fold in unary
  // twines.
  Child NewLHS, NewRHS;
  NewLHS.twine = this;
  NewRHS.twine = &Suffix;
  NodeKind NewLHSKind = TwineKind, NewRHSKind = TwineKind;
  if (isUnary()) {
    NewLHS = LHS;
    NewLHSKind = getLHSKind();
  }
  if (Suffix.isUnary()) {
    NewRHS = Suffix.LHS;
    NewRHSKind = Suffix.getLHSKind();
  }

  return Twine(NewLHS, NewLHSKind, NewRHS, NewRHSKind);
}

inline Twine operator+(const Twine &LHS, const Twine &RHS) {
  return LHS.concat(RHS);
47
←
Value assigned to field 'VecTy', which participates in a condition later→
48
←
Value assigned to field 'IntTy', which participates in a condition later→
}

/// Additional overload to guarantee simplified codegen; this is equivalent to
/// concat().

inline Twine operator+(const char *LHS, const StringRef &RHS) {
  return Twine(LHS, RHS);
}

/// Additional overload to guarantee simplified codegen; this is equivalent to
/// concat().

inline Twine operator+(const StringRef &LHS, const char *RHS) {
  return Twine(LHS, RHS);
}

inline raw_ostream &operator<<(raw_ostream &OS, const Twine &RHS) {
  RHS.print(OS);
  return OS;
}

/// @}

542} // end namespace llvm

544#endif // LLVM_ADT_TWINE_H