PPCISelLowering.cpp

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//===-- PPCISelLowering.cpp - PPC DAG Lowering Implementation -------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the PPCISelLowering class.
//
//===----------------------------------------------------------------------===//
 
#include "PPCISelLowering.h"
#include "MCTargetDesc/PPCPredicates.h"
#include "PPC.h"
#include "PPCCCState.h"
#include "PPCCallingConv.h"
#include "PPCFrameLowering.h"
#include "PPCInstrInfo.h"
#include "PPCMachineFunctionInfo.h"
#include "PPCPerfectShuffle.h"
#include "PPCRegisterInfo.h"
#include "PPCSubtarget.h"
#include "PPCTargetMachine.h"
#include "llvm/ADT/APFloat.h"
#include "llvm/ADT/APInt.h"
#include "llvm/ADT/APSInt.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/CodeGen/ISDOpcodes.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineJumpTableInfo.h"
#include "llvm/CodeGen/MachineLoopInfo.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/MachineValueType.h"
#include "llvm/CodeGen/RuntimeLibcalls.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/SelectionDAGNodes.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/CodeGen/TargetLowering.h"
#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/IR/CallingConv.h"
#include "llvm/IR/Constant.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DebugLoc.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/IntrinsicsPowerPC.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/Use.h"
#include "llvm/IR/Value.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSectionXCOFF.h"
#include "llvm/MC/MCSymbolXCOFF.h"
#include "llvm/Support/AtomicOrdering.h"
#include "llvm/Support/BranchProbability.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CodeGen.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/KnownBits.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include <algorithm>
#include <cassert>
#include <cstdint>
#include <iterator>
#include <list>
#include <optional>
#include <utility>
#include <vector>
 
using namespace llvm;
 
#define DEBUG_TYPE "ppc-lowering"
 
static cl::opt<bool> DisablePPCPreinc("disable-ppc-preinc",
cl::desc("disable preincrement load/store generation on PPC"), cl::Hidden);
 
static cl::opt<bool> DisableILPPref("disable-ppc-ilp-pref",
cl::desc("disable setting the node scheduling preference to ILP on PPC"), cl::Hidden);
 
static cl::opt<bool> DisablePPCUnaligned("disable-ppc-unaligned",
cl::desc("disable unaligned load/store generation on PPC"), cl::Hidden);
 
static cl::opt<bool> DisableSCO("disable-ppc-sco",
cl::desc("disable sibling call optimization on ppc"), cl::Hidden);
 
static cl::opt<bool> DisableInnermostLoopAlign32("disable-ppc-innermost-loop-align32",
cl::desc("don't always align innermost loop to 32 bytes on ppc"), cl::Hidden);
 
static cl::opt<bool> UseAbsoluteJumpTables("ppc-use-absolute-jumptables",
cl::desc("use absolute jump tables on ppc"), cl::Hidden);
 
static cl::opt<bool>
    DisablePerfectShuffle("ppc-disable-perfect-shuffle",
                          cl::desc("disable vector permute decomposition"),
                          cl::init(true), cl::Hidden);
 
cl::opt<bool> DisableAutoPairedVecSt(
    "disable-auto-paired-vec-st",
    cl::desc("disable automatically generated 32byte paired vector stores"),
    cl::init(true), cl::Hidden);
 
static cl::opt<unsigned> PPCMinimumJumpTableEntries(
    "ppc-min-jump-table-entries", cl::init(64), cl::Hidden,
    cl::desc("Set minimum number of entries to use a jump table on PPC"));
 
STATISTIC(NumTailCalls, "Number of tail calls");
STATISTIC(NumSiblingCalls, "Number of sibling calls");
STATISTIC(ShufflesHandledWithVPERM,
          "Number of shuffles lowered to a VPERM or XXPERM");
STATISTIC(NumDynamicAllocaProbed, "Number of dynamic stack allocation probed");
 
static bool isNByteElemShuffleMask(ShuffleVectorSDNode *, unsigned, int);
 
static SDValue widenVec(SelectionDAG &DAG, SDValue Vec, const SDLoc &dl);
 
static const char AIXSSPCanaryWordName[] = "__ssp_canary_word";
 
// A faster local-exec TLS access sequence (enabled with the
// -maix-small-local-exec-tls option) can be produced for TLS variables;
// consistent with the IBM XL compiler, we apply a max size of slightly under
// 32KB.
constexpr uint64_t AIXSmallTlsPolicySizeLimit = 32751;
 
// FIXME: Remove this once the bug has been fixed!
extern cl::opt<bool> ANDIGlueBug;
 
PPCTargetLowering::PPCTargetLowering(const PPCTargetMachine &TM,
                                     const PPCSubtarget &STI)
    : TargetLowering(TM), Subtarget(STI) {
  // Initialize map that relates the PPC addressing modes to the computed flags
  // of a load/store instruction. The map is used to determine the optimal
  // addressing mode when selecting load and stores.
  initializeAddrModeMap();
  // On PPC32/64, arguments smaller than 4/8 bytes are extended, so all
  // arguments are at least 4/8 bytes aligned.
  bool isPPC64 = Subtarget.isPPC64();
  setMinStackArgumentAlignment(isPPC64 ? Align(8) : Align(4));
 
  // Set up the register classes.
  addRegisterClass(MVT::i32, &PPC::GPRCRegClass);
  if (!useSoftFloat()) {
    if (hasSPE()) {
      addRegisterClass(MVT::f32, &PPC::GPRCRegClass);
      // EFPU2 APU only supports f32
      if (!Subtarget.hasEFPU2())
        addRegisterClass(MVT::f64, &PPC::SPERCRegClass);
    } else {
      addRegisterClass(MVT::f32, &PPC::F4RCRegClass);
      addRegisterClass(MVT::f64, &PPC::F8RCRegClass);
    }
  }
 
  // Match BITREVERSE to customized fast code sequence in the td file.
  setOperationAction(ISD::BITREVERSE, MVT::i32, Legal);
  setOperationAction(ISD::BITREVERSE, MVT::i64, Legal);
 
  // Sub-word ATOMIC_CMP_SWAP need to ensure that the input is zero-extended.
  setOperationAction(ISD::ATOMIC_CMP_SWAP, MVT::i32, Custom);
 
  // Custom lower inline assembly to check for special registers.
  setOperationAction(ISD::INLINEASM, MVT::Other, Custom);
  setOperationAction(ISD::INLINEASM_BR, MVT::Other, Custom);
 
  // PowerPC has an i16 but no i8 (or i1) SEXTLOAD.
  for (MVT VT : MVT::integer_valuetypes()) {
    setLoadExtAction(ISD::SEXTLOAD, VT, MVT::i1, Promote);
    setLoadExtAction(ISD::SEXTLOAD, VT, MVT::i8, Expand);
  }
 
  if (Subtarget.isISA3_0()) {
    setLoadExtAction(ISD::EXTLOAD, MVT::f64, MVT::f16, Legal);
    setLoadExtAction(ISD::EXTLOAD, MVT::f32, MVT::f16, Legal);
    setTruncStoreAction(MVT::f64, MVT::f16, Legal);
    setTruncStoreAction(MVT::f32, MVT::f16, Legal);
  } else {
    // No extending loads from f16 or HW conversions back and forth.
    setLoadExtAction(ISD::EXTLOAD, MVT::f64, MVT::f16, Expand);
    setOperationAction(ISD::FP16_TO_FP, MVT::f64, Expand);
    setOperationAction(ISD::FP_TO_FP16, MVT::f64, Expand);
    setLoadExtAction(ISD::EXTLOAD, MVT::f32, MVT::f16, Expand);
    setOperationAction(ISD::FP16_TO_FP, MVT::f32, Expand);
    setOperationAction(ISD::FP_TO_FP16, MVT::f32, Expand);
    setTruncStoreAction(MVT::f64, MVT::f16, Expand);
    setTruncStoreAction(MVT::f32, MVT::f16, Expand);
  }
 
  setTruncStoreAction(MVT::f64, MVT::f32, Expand);
 
  // PowerPC has pre-inc load and store's.
  setIndexedLoadAction(ISD::PRE_INC, MVT::i1, Legal);
  setIndexedLoadAction(ISD::PRE_INC, MVT::i8, Legal);
  setIndexedLoadAction(ISD::PRE_INC, MVT::i16, Legal);
  setIndexedLoadAction(ISD::PRE_INC, MVT::i32, Legal);
  setIndexedLoadAction(ISD::PRE_INC, MVT::i64, Legal);
  setIndexedStoreAction(ISD::PRE_INC, MVT::i1, Legal);
  setIndexedStoreAction(ISD::PRE_INC, MVT::i8, Legal);
  setIndexedStoreAction(ISD::PRE_INC, MVT::i16, Legal);
  setIndexedStoreAction(ISD::PRE_INC, MVT::i32, Legal);
  setIndexedStoreAction(ISD::PRE_INC, MVT::i64, Legal);
  if (!Subtarget.hasSPE()) {
    setIndexedLoadAction(ISD::PRE_INC, MVT::f32, Legal);
    setIndexedLoadAction(ISD::PRE_INC, MVT::f64, Legal);
    setIndexedStoreAction(ISD::PRE_INC, MVT::f32, Legal);
    setIndexedStoreAction(ISD::PRE_INC, MVT::f64, Legal);
  }
 
  // PowerPC uses ADDC/ADDE/SUBC/SUBE to propagate carry.
  const MVT ScalarIntVTs[] = { MVT::i32, MVT::i64 };
  for (MVT VT : ScalarIntVTs) {
    setOperationAction(ISD::ADDC, VT, Legal);
    setOperationAction(ISD::ADDE, VT, Legal);
    setOperationAction(ISD::SUBC, VT, Legal);
    setOperationAction(ISD::SUBE, VT, Legal);
  }
 
  if (Subtarget.useCRBits()) {
    setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
 
    if (isPPC64 || Subtarget.hasFPCVT()) {
      setOperationAction(ISD::STRICT_SINT_TO_FP, MVT::i1, Promote);
      AddPromotedToType(ISD::STRICT_SINT_TO_FP, MVT::i1,
                        isPPC64 ? MVT::i64 : MVT::i32);
      setOperationAction(ISD::STRICT_UINT_TO_FP, MVT::i1, Promote);
      AddPromotedToType(ISD::STRICT_UINT_TO_FP, MVT::i1,
                        isPPC64 ? MVT::i64 : MVT::i32);
 
      setOperationAction(ISD::SINT_TO_FP, MVT::i1, Promote);
      AddPromotedToType (ISD::SINT_TO_FP, MVT::i1,
                         isPPC64 ? MVT::i64 : MVT::i32);
      setOperationAction(ISD::UINT_TO_FP, MVT::i1, Promote);
      AddPromotedToType(ISD::UINT_TO_FP, MVT::i1,
                        isPPC64 ? MVT::i64 : MVT::i32);
 
      setOperationAction(ISD::STRICT_FP_TO_SINT, MVT::i1, Promote);
      AddPromotedToType(ISD::STRICT_FP_TO_SINT, MVT::i1,
                        isPPC64 ? MVT::i64 : MVT::i32);
      setOperationAction(ISD::STRICT_FP_TO_UINT, MVT::i1, Promote);
      AddPromotedToType(ISD::STRICT_FP_TO_UINT, MVT::i1,
                        isPPC64 ? MVT::i64 : MVT::i32);
 
      setOperationAction(ISD::FP_TO_SINT, MVT::i1, Promote);
      AddPromotedToType(ISD::FP_TO_SINT, MVT::i1,
                        isPPC64 ? MVT::i64 : MVT::i32);
      setOperationAction(ISD::FP_TO_UINT, MVT::i1, Promote);
      AddPromotedToType(ISD::FP_TO_UINT, MVT::i1,
                        isPPC64 ? MVT::i64 : MVT::i32);
    } else {
      setOperationAction(ISD::STRICT_SINT_TO_FP, MVT::i1, Custom);
      setOperationAction(ISD::STRICT_UINT_TO_FP, MVT::i1, Custom);
      setOperationAction(ISD::SINT_TO_FP, MVT::i1, Custom);
      setOperationAction(ISD::UINT_TO_FP, MVT::i1, Custom);
    }
 
    // PowerPC does not support direct load/store of condition registers.
    setOperationAction(ISD::LOAD, MVT::i1, Custom);
    setOperationAction(ISD::STORE, MVT::i1, Custom);
 
    // FIXME: Remove this once the ANDI glue bug is fixed:
    if (ANDIGlueBug)
      setOperationAction(ISD::TRUNCATE, MVT::i1, Custom);
 
    for (MVT VT : MVT::integer_valuetypes()) {
      setLoadExtAction(ISD::SEXTLOAD, VT, MVT::i1, Promote);
      setLoadExtAction(ISD::ZEXTLOAD, VT, MVT::i1, Promote);
      setTruncStoreAction(VT, MVT::i1, Expand);
    }
 
    addRegisterClass(MVT::i1, &PPC::CRBITRCRegClass);
  }
 
  // Expand ppcf128 to i32 by hand for the benefit of llvm-gcc bootstrap on
  // PPC (the libcall is not available).
  setOperationAction(ISD::FP_TO_SINT, MVT::ppcf128, Custom);
  setOperationAction(ISD::FP_TO_UINT, MVT::ppcf128, Custom);
  setOperationAction(ISD::STRICT_FP_TO_SINT, MVT::ppcf128, Custom);
  setOperationAction(ISD::STRICT_FP_TO_UINT, MVT::ppcf128, Custom);
 
  // We do not currently implement these libm ops for PowerPC.
  setOperationAction(ISD::FFLOOR, MVT::ppcf128, Expand);
  setOperationAction(ISD::FCEIL,  MVT::ppcf128, Expand);
  setOperationAction(ISD::FTRUNC, MVT::ppcf128, Expand);
  setOperationAction(ISD::FRINT,  MVT::ppcf128, Expand);
  setOperationAction(ISD::FNEARBYINT, MVT::ppcf128, Expand);
  setOperationAction(ISD::FREM, MVT::ppcf128, Expand);
 
  // PowerPC has no SREM/UREM instructions unless we are on P9
  // On P9 we may use a hardware instruction to compute the remainder.
  // When the result of both the remainder and the division is required it is
  // more efficient to compute the remainder from the result of the division
  // rather than use the remainder instruction. The instructions are legalized
  // directly because the DivRemPairsPass performs the transformation at the IR
  // level.
  if (Subtarget.isISA3_0()) {
    setOperationAction(ISD::SREM, MVT::i32, Legal);
    setOperationAction(ISD::UREM, MVT::i32, Legal);
    setOperationAction(ISD::SREM, MVT::i64, Legal);
    setOperationAction(ISD::UREM, MVT::i64, Legal);
  } else {
    setOperationAction(ISD::SREM, MVT::i32, Expand);
    setOperationAction(ISD::UREM, MVT::i32, Expand);
    setOperationAction(ISD::SREM, MVT::i64, Expand);
    setOperationAction(ISD::UREM, MVT::i64, Expand);
  }
 
  // Don't use SMUL_LOHI/UMUL_LOHI or SDIVREM/UDIVREM to lower SREM/UREM.
  setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand);
  setOperationAction(ISD::SMUL_LOHI, MVT::i32, Expand);
  setOperationAction(ISD::UMUL_LOHI, MVT::i64, Expand);
  setOperationAction(ISD::SMUL_LOHI, MVT::i64, Expand);
  setOperationAction(ISD::UDIVREM, MVT::i32, Expand);
  setOperationAction(ISD::SDIVREM, MVT::i32, Expand);
  setOperationAction(ISD::UDIVREM, MVT::i64, Expand);
  setOperationAction(ISD::SDIVREM, MVT::i64, Expand);
 
  // Handle constrained floating-point operations of scalar.
  // TODO: Handle SPE specific operation.
  setOperationAction(ISD::STRICT_FADD, MVT::f32, Legal);
  setOperationAction(ISD::STRICT_FSUB, MVT::f32, Legal);
  setOperationAction(ISD::STRICT_FMUL, MVT::f32, Legal);
  setOperationAction(ISD::STRICT_FDIV, MVT::f32, Legal);
  setOperationAction(ISD::STRICT_FP_ROUND, MVT::f32, Legal);
 
  setOperationAction(ISD::STRICT_FADD, MVT::f64, Legal);
  setOperationAction(ISD::STRICT_FSUB, MVT::f64, Legal);
  setOperationAction(ISD::STRICT_FMUL, MVT::f64, Legal);
  setOperationAction(ISD::STRICT_FDIV, MVT::f64, Legal);
 
  if (!Subtarget.hasSPE()) {
    setOperationAction(ISD::STRICT_FMA, MVT::f32, Legal);
    setOperationAction(ISD::STRICT_FMA, MVT::f64, Legal);
  }
 
  if (Subtarget.hasVSX()) {
    setOperationAction(ISD::STRICT_FRINT, MVT::f32, Legal);
    setOperationAction(ISD::STRICT_FRINT, MVT::f64, Legal);
  }
 
  if (Subtarget.hasFSQRT()) {
    setOperationAction(ISD::STRICT_FSQRT, MVT::f32, Legal);
    setOperationAction(ISD::STRICT_FSQRT, MVT::f64, Legal);
  }
 
  if (Subtarget.hasFPRND()) {
    setOperationAction(ISD::STRICT_FFLOOR, MVT::f32, Legal);
    setOperationAction(ISD::STRICT_FCEIL,  MVT::f32, Legal);
    setOperationAction(ISD::STRICT_FTRUNC, MVT::f32, Legal);
    setOperationAction(ISD::STRICT_FROUND, MVT::f32, Legal);
 
    setOperationAction(ISD::STRICT_FFLOOR, MVT::f64, Legal);
    setOperationAction(ISD::STRICT_FCEIL,  MVT::f64, Legal);
    setOperationAction(ISD::STRICT_FTRUNC, MVT::f64, Legal);
    setOperationAction(ISD::STRICT_FROUND, MVT::f64, Legal);
  }
 
  // We don't support sin/cos/sqrt/fmod/pow
  setOperationAction(ISD::FSIN , MVT::f64, Expand);
  setOperationAction(ISD::FCOS , MVT::f64, Expand);
  setOperationAction(ISD::FSINCOS, MVT::f64, Expand);
  setOperationAction(ISD::FREM , MVT::f64, Expand);
  setOperationAction(ISD::FPOW , MVT::f64, Expand);
  setOperationAction(ISD::FSIN , MVT::f32, Expand);
  setOperationAction(ISD::FCOS , MVT::f32, Expand);
  setOperationAction(ISD::FSINCOS, MVT::f32, Expand);
  setOperationAction(ISD::FREM , MVT::f32, Expand);
  setOperationAction(ISD::FPOW , MVT::f32, Expand);
 
  // MASS transformation for LLVM intrinsics with replicating fast-math flag
  // to be consistent to PPCGenScalarMASSEntries pass
  if (TM.getOptLevel() == CodeGenOptLevel::Aggressive) {
    setOperationAction(ISD::FSIN , MVT::f64, Custom);
    setOperationAction(ISD::FCOS , MVT::f64, Custom);
    setOperationAction(ISD::FPOW , MVT::f64, Custom);
    setOperationAction(ISD::FLOG, MVT::f64, Custom);
    setOperationAction(ISD::FLOG10, MVT::f64, Custom);
    setOperationAction(ISD::FEXP, MVT::f64, Custom);
    setOperationAction(ISD::FSIN , MVT::f32, Custom);
    setOperationAction(ISD::FCOS , MVT::f32, Custom);
    setOperationAction(ISD::FPOW , MVT::f32, Custom);
    setOperationAction(ISD::FLOG, MVT::f32, Custom);
    setOperationAction(ISD::FLOG10, MVT::f32, Custom);
    setOperationAction(ISD::FEXP, MVT::f32, Custom);
  }
 
  if (Subtarget.hasSPE()) {
    setOperationAction(ISD::FMA  , MVT::f64, Expand);
    setOperationAction(ISD::FMA  , MVT::f32, Expand);
  } else {
    setOperationAction(ISD::FMA  , MVT::f64, Legal);
    setOperationAction(ISD::FMA  , MVT::f32, Legal);
  }
 
  if (Subtarget.hasSPE())
    setLoadExtAction(ISD::EXTLOAD, MVT::f64, MVT::f32, Expand);
 
  setOperationAction(ISD::GET_ROUNDING, MVT::i32, Custom);
 
  // If we're enabling GP optimizations, use hardware square root
  if (!Subtarget.hasFSQRT() &&
      !(TM.Options.UnsafeFPMath && Subtarget.hasFRSQRTE() &&
        Subtarget.hasFRE()))
    setOperationAction(ISD::FSQRT, MVT::f64, Expand);
 
  if (!Subtarget.hasFSQRT() &&
      !(TM.Options.UnsafeFPMath && Subtarget.hasFRSQRTES() &&
        Subtarget.hasFRES()))
    setOperationAction(ISD::FSQRT, MVT::f32, Expand);
 
  if (Subtarget.hasFCPSGN()) {
    setOperationAction(ISD::FCOPYSIGN, MVT::f64, Legal);
    setOperationAction(ISD::FCOPYSIGN, MVT::f32, Legal);
  } else {
    setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
    setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand);
  }
 
  if (Subtarget.hasFPRND()) {
    setOperationAction(ISD::FFLOOR, MVT::f64, Legal);
    setOperationAction(ISD::FCEIL,  MVT::f64, Legal);
    setOperationAction(ISD::FTRUNC, MVT::f64, Legal);
    setOperationAction(ISD::FROUND, MVT::f64, Legal);
 
    setOperationAction(ISD::FFLOOR, MVT::f32, Legal);
    setOperationAction(ISD::FCEIL,  MVT::f32, Legal);
    setOperationAction(ISD::FTRUNC, MVT::f32, Legal);
    setOperationAction(ISD::FROUND, MVT::f32, Legal);
  }
 
  // Prior to P10, PowerPC does not have BSWAP, but we can use vector BSWAP
  // instruction xxbrd to speed up scalar BSWAP64.
  if (Subtarget.isISA3_1()) {
    setOperationAction(ISD::BSWAP, MVT::i32, Legal);
    setOperationAction(ISD::BSWAP, MVT::i64, Legal);
  } else {
    setOperationAction(ISD::BSWAP, MVT::i32, Expand);
    setOperationAction(
        ISD::BSWAP, MVT::i64,
        (Subtarget.hasP9Vector() && Subtarget.isPPC64()) ? Custom : Expand);
  }
 
  // CTPOP or CTTZ were introduced in P8/P9 respectively
  if (Subtarget.isISA3_0()) {
    setOperationAction(ISD::CTTZ , MVT::i32  , Legal);
    setOperationAction(ISD::CTTZ , MVT::i64  , Legal);
  } else {
    setOperationAction(ISD::CTTZ , MVT::i32  , Expand);
    setOperationAction(ISD::CTTZ , MVT::i64  , Expand);
  }
 
  if (Subtarget.hasPOPCNTD() == PPCSubtarget::POPCNTD_Fast) {
    setOperationAction(ISD::CTPOP, MVT::i32  , Legal);
    setOperationAction(ISD::CTPOP, MVT::i64  , Legal);
  } else {
    setOperationAction(ISD::CTPOP, MVT::i32  , Expand);
    setOperationAction(ISD::CTPOP, MVT::i64  , Expand);
  }
 
  // PowerPC does not have ROTR
  setOperationAction(ISD::ROTR, MVT::i32   , Expand);
  setOperationAction(ISD::ROTR, MVT::i64   , Expand);
 
  if (!Subtarget.useCRBits()) {
    // PowerPC does not have Select
    setOperationAction(ISD::SELECT, MVT::i32, Expand);
    setOperationAction(ISD::SELECT, MVT::i64, Expand);
    setOperationAction(ISD::SELECT, MVT::f32, Expand);
    setOperationAction(ISD::SELECT, MVT::f64, Expand);
  }
 
  // PowerPC wants to turn select_cc of FP into fsel when possible.
  setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
  setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
 
  // PowerPC wants to optimize integer setcc a bit
  if (!Subtarget.useCRBits())
    setOperationAction(ISD::SETCC, MVT::i32, Custom);
 
  if (Subtarget.hasFPU()) {
    setOperationAction(ISD::STRICT_FSETCC, MVT::f32, Legal);
    setOperationAction(ISD::STRICT_FSETCC, MVT::f64, Legal);
    setOperationAction(ISD::STRICT_FSETCC, MVT::f128, Legal);
 
    setOperationAction(ISD::STRICT_FSETCCS, MVT::f32, Legal);
    setOperationAction(ISD::STRICT_FSETCCS, MVT::f64, Legal);
    setOperationAction(ISD::STRICT_FSETCCS, MVT::f128, Legal);
  }
 
  // PowerPC does not have BRCOND which requires SetCC
  if (!Subtarget.useCRBits())
    setOperationAction(ISD::BRCOND, MVT::Other, Expand);
 
  setOperationAction(ISD::BR_JT,  MVT::Other, Expand);
 
  if (Subtarget.hasSPE()) {
    // SPE has built-in conversions
    setOperationAction(ISD::STRICT_FP_TO_SINT, MVT::i32, Legal);
    setOperationAction(ISD::STRICT_SINT_TO_FP, MVT::i32, Legal);
    setOperationAction(ISD::STRICT_UINT_TO_FP, MVT::i32, Legal);
    setOperationAction(ISD::FP_TO_SINT, MVT::i32, Legal);
    setOperationAction(ISD::SINT_TO_FP, MVT::i32, Legal);
    setOperationAction(ISD::UINT_TO_FP, MVT::i32, Legal);
 
    // SPE supports signaling compare of f32/f64.
    setOperationAction(ISD::STRICT_FSETCCS, MVT::f32, Legal);
    setOperationAction(ISD::STRICT_FSETCCS, MVT::f64, Legal);
  } else {
    // PowerPC turns FP_TO_SINT into FCTIWZ and some load/stores.
    setOperationAction(ISD::STRICT_FP_TO_SINT, MVT::i32, Custom);
    setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
 
    // PowerPC does not have [U|S]INT_TO_FP
    setOperationAction(ISD::STRICT_SINT_TO_FP, MVT::i32, Expand);
    setOperationAction(ISD::STRICT_UINT_TO_FP, MVT::i32, Expand);
    setOperationAction(ISD::SINT_TO_FP, MVT::i32, Expand);
    setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
  }
 
  if (Subtarget.hasDirectMove() && isPPC64) {
    setOperationAction(ISD::BITCAST, MVT::f32, Legal);
    setOperationAction(ISD::BITCAST, MVT::i32, Legal);
    setOperationAction(ISD::BITCAST, MVT::i64, Legal);
    setOperationAction(ISD::BITCAST, MVT::f64, Legal);
    if (TM.Options.UnsafeFPMath) {
      setOperationAction(ISD::LRINT, MVT::f64, Legal);
      setOperationAction(ISD::LRINT, MVT::f32, Legal);
      setOperationAction(ISD::LLRINT, MVT::f64, Legal);
      setOperationAction(ISD::LLRINT, MVT::f32, Legal);
      setOperationAction(ISD::LROUND, MVT::f64, Legal);
      setOperationAction(ISD::LROUND, MVT::f32, Legal);
      setOperationAction(ISD::LLROUND, MVT::f64, Legal);
      setOperationAction(ISD::LLROUND, MVT::f32, Legal);
    }
  } else {
    setOperationAction(ISD::BITCAST, MVT::f32, Expand);
    setOperationAction(ISD::BITCAST, MVT::i32, Expand);
    setOperationAction(ISD::BITCAST, MVT::i64, Expand);
    setOperationAction(ISD::BITCAST, MVT::f64, Expand);
  }
 
  // We cannot sextinreg(i1).  Expand to shifts.
  setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
 
  // NOTE: EH_SJLJ_SETJMP/_LONGJMP supported here is NOT intended to support
  // SjLj exception handling but a light-weight setjmp/longjmp replacement to
  // support continuation, user-level threading, and etc.. As a result, no
  // other SjLj exception interfaces are implemented and please don't build
  // your own exception handling based on them.
  // LLVM/Clang supports zero-cost DWARF exception handling.
  setOperationAction(ISD::EH_SJLJ_SETJMP, MVT::i32, Custom);
  setOperationAction(ISD::EH_SJLJ_LONGJMP, MVT::Other, Custom);
 
  // We want to legalize GlobalAddress and ConstantPool nodes into the
  // appropriate instructions to materialize the address.
  setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
  setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
  setOperationAction(ISD::BlockAddress,  MVT::i32, Custom);
  setOperationAction(ISD::ConstantPool,  MVT::i32, Custom);
  setOperationAction(ISD::JumpTable,     MVT::i32, Custom);
  setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
  setOperationAction(ISD::GlobalTLSAddress, MVT::i64, Custom);
  setOperationAction(ISD::BlockAddress,  MVT::i64, Custom);
  setOperationAction(ISD::ConstantPool,  MVT::i64, Custom);
  setOperationAction(ISD::JumpTable,     MVT::i64, Custom);
 
  // TRAP is legal.
  setOperationAction(ISD::TRAP, MVT::Other, Legal);
 
  // TRAMPOLINE is custom lowered.
  setOperationAction(ISD::INIT_TRAMPOLINE, MVT::Other, Custom);
  setOperationAction(ISD::ADJUST_TRAMPOLINE, MVT::Other, Custom);
 
  // VASTART needs to be custom lowered to use the VarArgsFrameIndex
  setOperationAction(ISD::VASTART           , MVT::Other, Custom);
 
  if (Subtarget.is64BitELFABI()) {
    // VAARG always uses double-word chunks, so promote anything smaller.
    setOperationAction(ISD::VAARG, MVT::i1, Promote);
    AddPromotedToType(ISD::VAARG, MVT::i1, MVT::i64);
    setOperationAction(ISD::VAARG, MVT::i8, Promote);
    AddPromotedToType(ISD::VAARG, MVT::i8, MVT::i64);
    setOperationAction(ISD::VAARG, MVT::i16, Promote);
    AddPromotedToType(ISD::VAARG, MVT::i16, MVT::i64);
    setOperationAction(ISD::VAARG, MVT::i32, Promote);
    AddPromotedToType(ISD::VAARG, MVT::i32, MVT::i64);
    setOperationAction(ISD::VAARG, MVT::Other, Expand);
  } else if (Subtarget.is32BitELFABI()) {
    // VAARG is custom lowered with the 32-bit SVR4 ABI.
    setOperationAction(ISD::VAARG, MVT::Other, Custom);
    setOperationAction(ISD::VAARG, MVT::i64, Custom);
  } else
    setOperationAction(ISD::VAARG, MVT::Other, Expand);
 
  // VACOPY is custom lowered with the 32-bit SVR4 ABI.
  if (Subtarget.is32BitELFABI())
    setOperationAction(ISD::VACOPY            , MVT::Other, Custom);
  else
    setOperationAction(ISD::VACOPY            , MVT::Other, Expand);
 
  // Use the default implementation.
  setOperationAction(ISD::VAEND             , MVT::Other, Expand);
  setOperationAction(ISD::STACKSAVE         , MVT::Other, Expand);
  setOperationAction(ISD::STACKRESTORE      , MVT::Other, Custom);
  setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32  , Custom);
  setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64  , Custom);
  setOperationAction(ISD::GET_DYNAMIC_AREA_OFFSET, MVT::i32, Custom);
  setOperationAction(ISD::GET_DYNAMIC_AREA_OFFSET, MVT::i64, Custom);
  setOperationAction(ISD::EH_DWARF_CFA, MVT::i32, Custom);
  setOperationAction(ISD::EH_DWARF_CFA, MVT::i64, Custom);
 
  // We want to custom lower some of our intrinsics.
  setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
  setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::f64, Custom);
  setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::ppcf128, Custom);
  setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::v4f32, Custom);
  setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::v2f64, Custom);
 
  // To handle counter-based loop conditions.
  setOperationAction(ISD::INTRINSIC_W_CHAIN, MVT::i1, Custom);
 
  setOperationAction(ISD::INTRINSIC_VOID, MVT::i8, Custom);
  setOperationAction(ISD::INTRINSIC_VOID, MVT::i16, Custom);
  setOperationAction(ISD::INTRINSIC_VOID, MVT::i32, Custom);
  setOperationAction(ISD::INTRINSIC_VOID, MVT::Other, Custom);
 
  // Comparisons that require checking two conditions.
  if (Subtarget.hasSPE()) {
    setCondCodeAction(ISD::SETO, MVT::f32, Expand);
    setCondCodeAction(ISD::SETO, MVT::f64, Expand);
    setCondCodeAction(ISD::SETUO, MVT::f32, Expand);
    setCondCodeAction(ISD::SETUO, MVT::f64, Expand);
  }
  setCondCodeAction(ISD::SETULT, MVT::f32, Expand);
  setCondCodeAction(ISD::SETULT, MVT::f64, Expand);
  setCondCodeAction(ISD::SETUGT, MVT::f32, Expand);
  setCondCodeAction(ISD::SETUGT, MVT::f64, Expand);
  setCondCodeAction(ISD::SETUEQ, MVT::f32, Expand);
  setCondCodeAction(ISD::SETUEQ, MVT::f64, Expand);
  setCondCodeAction(ISD::SETOGE, MVT::f32, Expand);
  setCondCodeAction(ISD::SETOGE, MVT::f64, Expand);
  setCondCodeAction(ISD::SETOLE, MVT::f32, Expand);
  setCondCodeAction(ISD::SETOLE, MVT::f64, Expand);
  setCondCodeAction(ISD::SETONE, MVT::f32, Expand);
  setCondCodeAction(ISD::SETONE, MVT::f64, Expand);
 
  setOperationAction(ISD::STRICT_FP_EXTEND, MVT::f32, Legal);
  setOperationAction(ISD::STRICT_FP_EXTEND, MVT::f64, Legal);
 
  if (Subtarget.has64BitSupport()) {
    // They also have instructions for converting between i64 and fp.
    setOperationAction(ISD::STRICT_FP_TO_SINT, MVT::i64, Custom);
    setOperationAction(ISD::STRICT_FP_TO_UINT, MVT::i64, Expand);
    setOperationAction(ISD::STRICT_SINT_TO_FP, MVT::i64, Custom);
    setOperationAction(ISD::STRICT_UINT_TO_FP, MVT::i64, Expand);
    setOperationAction(ISD::FP_TO_SINT, MVT::i64, Custom);
    setOperationAction(ISD::FP_TO_UINT, MVT::i64, Expand);
    setOperationAction(ISD::SINT_TO_FP, MVT::i64, Custom);
    setOperationAction(ISD::UINT_TO_FP, MVT::i64, Expand);
    // This is just the low 32 bits of a (signed) fp->i64 conversion.
    // We cannot do this with Promote because i64 is not a legal type.
    setOperationAction(ISD::STRICT_FP_TO_UINT, MVT::i32, Custom);
    setOperationAction(ISD::FP_TO_UINT, MVT::i32, Custom);
 
    if (Subtarget.hasLFIWAX() || Subtarget.isPPC64()) {
      setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
      setOperationAction(ISD::STRICT_SINT_TO_FP, MVT::i32, Custom);
    }
  } else {
    // PowerPC does not have FP_TO_UINT on 32-bit implementations.
    if (Subtarget.hasSPE()) {
      setOperationAction(ISD::STRICT_FP_TO_UINT, MVT::i32, Legal);
      setOperationAction(ISD::FP_TO_UINT, MVT::i32, Legal);
    } else {
      setOperationAction(ISD::STRICT_FP_TO_UINT, MVT::i32, Expand);
      setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
    }
  }
 
  // With the instructions enabled under FPCVT, we can do everything.
  if (Subtarget.hasFPCVT()) {
    if (Subtarget.has64BitSupport()) {
      setOperationAction(ISD::STRICT_FP_TO_SINT, MVT::i64, Custom);
      setOperationAction(ISD::STRICT_FP_TO_UINT, MVT::i64, Custom);
      setOperationAction(ISD::STRICT_SINT_TO_FP, MVT::i64, Custom);
      setOperationAction(ISD::STRICT_UINT_TO_FP, MVT::i64, Custom);
      setOperationAction(ISD::FP_TO_SINT, MVT::i64, Custom);
      setOperationAction(ISD::FP_TO_UINT, MVT::i64, Custom);
      setOperationAction(ISD::SINT_TO_FP, MVT::i64, Custom);
      setOperationAction(ISD::UINT_TO_FP, MVT::i64, Custom);
    }
 
    setOperationAction(ISD::STRICT_FP_TO_SINT, MVT::i32, Custom);
    setOperationAction(ISD::STRICT_FP_TO_UINT, MVT::i32, Custom);
    setOperationAction(ISD::STRICT_SINT_TO_FP, MVT::i32, Custom);
    setOperationAction(ISD::STRICT_UINT_TO_FP, MVT::i32, Custom);
    setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
    setOperationAction(ISD::FP_TO_UINT, MVT::i32, Custom);
    setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
    setOperationAction(ISD::UINT_TO_FP, MVT::i32, Custom);
  }
 
  if (Subtarget.use64BitRegs()) {
    // 64-bit PowerPC implementations can support i64 types directly
    addRegisterClass(MVT::i64, &PPC::G8RCRegClass);
    // BUILD_PAIR can't be handled natively, and should be expanded to shl/or
    setOperationAction(ISD::BUILD_PAIR, MVT::i64, Expand);
    // 64-bit PowerPC wants to expand i128 shifts itself.
    setOperationAction(ISD::SHL_PARTS, MVT::i64, Custom);
    setOperationAction(ISD::SRA_PARTS, MVT::i64, Custom);
    setOperationAction(ISD::SRL_PARTS, MVT::i64, Custom);
  } else {
    // 32-bit PowerPC wants to expand i64 shifts itself.
    setOperationAction(ISD::SHL_PARTS, MVT::i32, Custom);
    setOperationAction(ISD::SRA_PARTS, MVT::i32, Custom);
    setOperationAction(ISD::SRL_PARTS, MVT::i32, Custom);
  }
 
  // PowerPC has better expansions for funnel shifts than the generic
  // TargetLowering::expandFunnelShift.
  if (Subtarget.has64BitSupport()) {
    setOperationAction(ISD::FSHL, MVT::i64, Custom);
    setOperationAction(ISD::FSHR, MVT::i64, Custom);
  }
  setOperationAction(ISD::FSHL, MVT::i32, Custom);
  setOperationAction(ISD::FSHR, MVT::i32, Custom);
 
  if (Subtarget.hasVSX()) {
    setOperationAction(ISD::FMAXNUM_IEEE, MVT::f64, Legal);
    setOperationAction(ISD::FMAXNUM_IEEE, MVT::f32, Legal);
    setOperationAction(ISD::FMINNUM_IEEE, MVT::f64, Legal);
    setOperationAction(ISD::FMINNUM_IEEE, MVT::f32, Legal);
  }
 
  if (Subtarget.hasAltivec()) {
    for (MVT VT : { MVT::v16i8, MVT::v8i16, MVT::v4i32 }) {
      setOperationAction(ISD::SADDSAT, VT, Legal);
      setOperationAction(ISD::SSUBSAT, VT, Legal);
      setOperationAction(ISD::UADDSAT, VT, Legal);
      setOperationAction(ISD::USUBSAT, VT, Legal);
    }
    // First set operation action for all vector types to expand. Then we
    // will selectively turn on ones that can be effectively codegen'd.
    for (MVT VT : MVT::fixedlen_vector_valuetypes()) {
      // add/sub are legal for all supported vector VT's.
      setOperationAction(ISD::ADD, VT, Legal);
      setOperationAction(ISD::SUB, VT, Legal);
 
      // For v2i64, these are only valid with P8Vector. This is corrected after
      // the loop.
      if (VT.getSizeInBits() <= 128 && VT.getScalarSizeInBits() <= 64) {
        setOperationAction(ISD::SMAX, VT, Legal);
        setOperationAction(ISD::SMIN, VT, Legal);
        setOperationAction(ISD::UMAX, VT, Legal);
        setOperationAction(ISD::UMIN, VT, Legal);
      }
      else {
        setOperationAction(ISD::SMAX, VT, Expand);
        setOperationAction(ISD::SMIN, VT, Expand);
        setOperationAction(ISD::UMAX, VT, Expand);
        setOperationAction(ISD::UMIN, VT, Expand);
      }
 
      if (Subtarget.hasVSX()) {
        setOperationAction(ISD::FMAXNUM, VT, Legal);
        setOperationAction(ISD::FMINNUM, VT, Legal);
      }
 
      // Vector instructions introduced in P8
      if (Subtarget.hasP8Altivec() && (VT.SimpleTy != MVT::v1i128)) {
        setOperationAction(ISD::CTPOP, VT, Legal);
        setOperationAction(ISD::CTLZ, VT, Legal);
      }
      else {
        setOperationAction(ISD::CTPOP, VT, Expand);
        setOperationAction(ISD::CTLZ, VT, Expand);
      }
 
      // Vector instructions introduced in P9
      if (Subtarget.hasP9Altivec() && (VT.SimpleTy != MVT::v1i128))
        setOperationAction(ISD::CTTZ, VT, Legal);
      else
        setOperationAction(ISD::CTTZ, VT, Expand);
 
      // We promote all shuffles to v16i8.
      setOperationAction(ISD::VECTOR_SHUFFLE, VT, Promote);
      AddPromotedToType (ISD::VECTOR_SHUFFLE, VT, MVT::v16i8);
 
      // We promote all non-typed operations to v4i32.
      setOperationAction(ISD::AND   , VT, Promote);
      AddPromotedToType (ISD::AND   , VT, MVT::v4i32);
      setOperationAction(ISD::OR    , VT, Promote);
      AddPromotedToType (ISD::OR    , VT, MVT::v4i32);
      setOperationAction(ISD::XOR   , VT, Promote);
      AddPromotedToType (ISD::XOR   , VT, MVT::v4i32);
      setOperationAction(ISD::LOAD  , VT, Promote);
      AddPromotedToType (ISD::LOAD  , VT, MVT::v4i32);
      setOperationAction(ISD::SELECT, VT, Promote);
      AddPromotedToType (ISD::SELECT, VT, MVT::v4i32);
      setOperationAction(ISD::VSELECT, VT, Legal);
      setOperationAction(ISD::SELECT_CC, VT, Promote);
      AddPromotedToType (ISD::SELECT_CC, VT, MVT::v4i32);
      setOperationAction(ISD::STORE, VT, Promote);
      AddPromotedToType (ISD::STORE, VT, MVT::v4i32);
 
      // No other operations are legal.
      setOperationAction(ISD::MUL , VT, Expand);
      setOperationAction(ISD::SDIV, VT, Expand);
      setOperationAction(ISD::SREM, VT, Expand);
      setOperationAction(ISD::UDIV, VT, Expand);
      setOperationAction(ISD::UREM, VT, Expand);
      setOperationAction(ISD::FDIV, VT, Expand);
      setOperationAction(ISD::FREM, VT, Expand);
      setOperationAction(ISD::FNEG, VT, Expand);
      setOperationAction(ISD::FSQRT, VT, Expand);
      setOperationAction(ISD::FLOG, VT, Expand);
      setOperationAction(ISD::FLOG10, VT, Expand);
      setOperationAction(ISD::FLOG2, VT, Expand);
      setOperationAction(ISD::FEXP, VT, Expand);
      setOperationAction(ISD::FEXP2, VT, Expand);
      setOperationAction(ISD::FSIN, VT, Expand);
      setOperationAction(ISD::FCOS, VT, Expand);
      setOperationAction(ISD::FABS, VT, Expand);
      setOperationAction(ISD::FFLOOR, VT, Expand);
      setOperationAction(ISD::FCEIL,  VT, Expand);
      setOperationAction(ISD::FTRUNC, VT, Expand);
      setOperationAction(ISD::FRINT,  VT, Expand);
      setOperationAction(ISD::FLDEXP, VT, Expand);
      setOperationAction(ISD::FNEARBYINT, VT, Expand);
      setOperationAction(ISD::EXTRACT_VECTOR_ELT, VT, Expand);
      setOperationAction(ISD::INSERT_VECTOR_ELT, VT, Expand);
      setOperationAction(ISD::BUILD_VECTOR, VT, Expand);
      setOperationAction(ISD::MULHU, VT, Expand);
      setOperationAction(ISD::MULHS, VT, Expand);
      setOperationAction(ISD::UMUL_LOHI, VT, Expand);
      setOperationAction(ISD::SMUL_LOHI, VT, Expand);
      setOperationAction(ISD::UDIVREM, VT, Expand);
      setOperationAction(ISD::SDIVREM, VT, Expand);
      setOperationAction(ISD::SCALAR_TO_VECTOR, VT, Expand);
      setOperationAction(ISD::FPOW, VT, Expand);
      setOperationAction(ISD::BSWAP, VT, Expand);
      setOperationAction(ISD::SIGN_EXTEND_INREG, VT, Expand);
      setOperationAction(ISD::ROTL, VT, Expand);
      setOperationAction(ISD::ROTR, VT, Expand);
 
      for (MVT InnerVT : MVT::fixedlen_vector_valuetypes()) {
        setTruncStoreAction(VT, InnerVT, Expand);
        setLoadExtAction(ISD::SEXTLOAD, VT, InnerVT, Expand);
        setLoadExtAction(ISD::ZEXTLOAD, VT, InnerVT, Expand);
        setLoadExtAction(ISD::EXTLOAD, VT, InnerVT, Expand);
      }
    }
    setOperationAction(ISD::SELECT_CC, MVT::v4i32, Expand);
    if (!Subtarget.hasP8Vector()) {
      setOperationAction(ISD::SMAX, MVT::v2i64, Expand);
      setOperationAction(ISD::SMIN, MVT::v2i64, Expand);
      setOperationAction(ISD::UMAX, MVT::v2i64, Expand);
      setOperationAction(ISD::UMIN, MVT::v2i64, Expand);
    }
 
    // We can custom expand all VECTOR_SHUFFLEs to VPERM, others we can handle
    // with merges, splats, etc.
    setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v16i8, Custom);
 
    // Vector truncates to sub-word integer that fit in an Altivec/VSX register
    // are cheap, so handle them before they get expanded to scalar.
    setOperationAction(ISD::TRUNCATE, MVT::v8i8, Custom);
    setOperationAction(ISD::TRUNCATE, MVT::v4i8, Custom);
    setOperationAction(ISD::TRUNCATE, MVT::v2i8, Custom);
    setOperationAction(ISD::TRUNCATE, MVT::v4i16, Custom);
    setOperationAction(ISD::TRUNCATE, MVT::v2i16, Custom);
 
    setOperationAction(ISD::AND   , MVT::v4i32, Legal);
    setOperationAction(ISD::OR    , MVT::v4i32, Legal);
    setOperationAction(ISD::XOR   , MVT::v4i32, Legal);
    setOperationAction(ISD::LOAD  , MVT::v4i32, Legal);
    setOperationAction(ISD::SELECT, MVT::v4i32,
                       Subtarget.useCRBits() ? Legal : Expand);
    setOperationAction(ISD::STORE , MVT::v4i32, Legal);
    setOperationAction(ISD::STRICT_FP_TO_SINT, MVT::v4i32, Legal);
    setOperationAction(ISD::STRICT_FP_TO_UINT, MVT::v4i32, Legal);
    setOperationAction(ISD::STRICT_SINT_TO_FP, MVT::v4i32, Legal);
    setOperationAction(ISD::STRICT_UINT_TO_FP, MVT::v4i32, Legal);
    setOperationAction(ISD::FP_TO_SINT, MVT::v4i32, Legal);
    setOperationAction(ISD::FP_TO_UINT, MVT::v4i32, Legal);
    setOperationAction(ISD::SINT_TO_FP, MVT::v4i32, Legal);
    setOperationAction(ISD::UINT_TO_FP, MVT::v4i32, Legal);
    setOperationAction(ISD::FFLOOR, MVT::v4f32, Legal);
    setOperationAction(ISD::FCEIL, MVT::v4f32, Legal);
    setOperationAction(ISD::FTRUNC, MVT::v4f32, Legal);
    setOperationAction(ISD::FNEARBYINT, MVT::v4f32, Legal);
 
    // Custom lowering ROTL v1i128 to VECTOR_SHUFFLE v16i8.
    setOperationAction(ISD::ROTL, MVT::v1i128, Custom);
    // With hasAltivec set, we can lower ISD::ROTL to vrl(b|h|w).
    if (Subtarget.hasAltivec())
      for (auto VT : {MVT::v4i32, MVT::v8i16, MVT::v16i8})
        setOperationAction(ISD::ROTL, VT, Legal);
    // With hasP8Altivec set, we can lower ISD::ROTL to vrld.
    if (Subtarget.hasP8Altivec())
      setOperationAction(ISD::ROTL, MVT::v2i64, Legal);
 
    addRegisterClass(MVT::v4f32, &PPC::VRRCRegClass);
    addRegisterClass(MVT::v4i32, &PPC::VRRCRegClass);
    addRegisterClass(MVT::v8i16, &PPC::VRRCRegClass);
    addRegisterClass(MVT::v16i8, &PPC::VRRCRegClass);
 
    setOperationAction(ISD::MUL, MVT::v4f32, Legal);
    setOperationAction(ISD::FMA, MVT::v4f32, Legal);
 
    if (Subtarget.hasVSX()) {
      setOperationAction(ISD::FDIV, MVT::v4f32, Legal);
      setOperationAction(ISD::FSQRT, MVT::v4f32, Legal);
      setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v2f64, Custom);
    }
 
    if (Subtarget.hasP8Altivec())
      setOperationAction(ISD::MUL, MVT::v4i32, Legal);
    else
      setOperationAction(ISD::MUL, MVT::v4i32, Custom);
 
    if (Subtarget.isISA3_1()) {
      setOperationAction(ISD::MUL, MVT::v2i64, Legal);
      setOperationAction(ISD::MULHS, MVT::v2i64, Legal);
      setOperationAction(ISD::MULHU, MVT::v2i64, Legal);
      setOperationAction(ISD::MULHS, MVT::v4i32, Legal);
      setOperationAction(ISD::MULHU, MVT::v4i32, Legal);
      setOperationAction(ISD::UDIV, MVT::v2i64, Legal);
      setOperationAction(ISD::SDIV, MVT::v2i64, Legal);
      setOperationAction(ISD::UDIV, MVT::v4i32, Legal);
      setOperationAction(ISD::SDIV, MVT::v4i32, Legal);
      setOperationAction(ISD::UREM, MVT::v2i64, Legal);
      setOperationAction(ISD::SREM, MVT::v2i64, Legal);
      setOperationAction(ISD::UREM, MVT::v4i32, Legal);
      setOperationAction(ISD::SREM, MVT::v4i32, Legal);
      setOperationAction(ISD::UREM, MVT::v1i128, Legal);
      setOperationAction(ISD::SREM, MVT::v1i128, Legal);
      setOperationAction(ISD::UDIV, MVT::v1i128, Legal);
      setOperationAction(ISD::SDIV, MVT::v1i128, Legal);
      setOperationAction(ISD::ROTL, MVT::v1i128, Legal);
    }
 
    setOperationAction(ISD::MUL, MVT::v8i16, Legal);
    setOperationAction(ISD::MUL, MVT::v16i8, Custom);
 
    setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4f32, Custom);
    setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4i32, Custom);
 
    setOperationAction(ISD::BUILD_VECTOR, MVT::v16i8, Custom);
    setOperationAction(ISD::BUILD_VECTOR, MVT::v8i16, Custom);
    setOperationAction(ISD::BUILD_VECTOR, MVT::v4i32, Custom);
    setOperationAction(ISD::BUILD_VECTOR, MVT::v4f32, Custom);
 
    // Altivec does not contain unordered floating-point compare instructions
    setCondCodeAction(ISD::SETUO, MVT::v4f32, Expand);
    setCondCodeAction(ISD::SETUEQ, MVT::v4f32, Expand);
    setCondCodeAction(ISD::SETO,   MVT::v4f32, Expand);
    setCondCodeAction(ISD::SETONE, MVT::v4f32, Expand);
 
    if (Subtarget.hasVSX()) {
      setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v2f64, Legal);
      setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v2f64, Legal);
      if (Subtarget.hasP8Vector()) {
        setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4f32, Legal);
        setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v4f32, Legal);
      }
      if (Subtarget.hasDirectMove() && isPPC64) {
        setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v16i8, Legal);
        setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v8i16, Legal);
        setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4i32, Legal);
        setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v2i64, Legal);
        setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v16i8, Legal);
        setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v8i16, Legal);
        setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v4i32, Legal);
        setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v2i64, Legal);
      }
      setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v2f64, Legal);
 
      // The nearbyint variants are not allowed to raise the inexact exception
      // so we can only code-gen them with unsafe math.
      if (TM.Options.UnsafeFPMath) {
        setOperationAction(ISD::FNEARBYINT, MVT::f64, Legal);
        setOperationAction(ISD::FNEARBYINT, MVT::f32, Legal);
      }
 
      setOperationAction(ISD::FFLOOR, MVT::v2f64, Legal);
      setOperationAction(ISD::FCEIL, MVT::v2f64, Legal);
      setOperationAction(ISD::FTRUNC, MVT::v2f64, Legal);
      setOperationAction(ISD::FNEARBYINT, MVT::v2f64, Legal);
      setOperationAction(ISD::FRINT, MVT::v2f64, Legal);
      setOperationAction(ISD::FROUND, MVT::v2f64, Legal);
      setOperationAction(ISD::FROUND, MVT::f64, Legal);
      setOperationAction(ISD::FRINT, MVT::f64, Legal);
 
      setOperationAction(ISD::FNEARBYINT, MVT::v4f32, Legal);
      setOperationAction(ISD::FRINT, MVT::v4f32, Legal);
      setOperationAction(ISD::FROUND, MVT::v4f32, Legal);
      setOperationAction(ISD::FROUND, MVT::f32, Legal);
      setOperationAction(ISD::FRINT, MVT::f32, Legal);
 
      setOperationAction(ISD::MUL, MVT::v2f64, Legal);
      setOperationAction(ISD::FMA, MVT::v2f64, Legal);
 
      setOperationAction(ISD::FDIV, MVT::v2f64, Legal);
      setOperationAction(ISD::FSQRT, MVT::v2f64, Legal);
 
      // Share the Altivec comparison restrictions.
      setCondCodeAction(ISD::SETUO, MVT::v2f64, Expand);
      setCondCodeAction(ISD::SETUEQ, MVT::v2f64, Expand);
      setCondCodeAction(ISD::SETO,   MVT::v2f64, Expand);
      setCondCodeAction(ISD::SETONE, MVT::v2f64, Expand);
 
      setOperationAction(ISD::LOAD, MVT::v2f64, Legal);
      setOperationAction(ISD::STORE, MVT::v2f64, Legal);
 
      setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v2f64, Custom);
 
      if (Subtarget.hasP8Vector())
        addRegisterClass(MVT::f32, &PPC::VSSRCRegClass);
 
      addRegisterClass(MVT::f64, &PPC::VSFRCRegClass);
 
      addRegisterClass(MVT::v4i32, &PPC::VSRCRegClass);
      addRegisterClass(MVT::v4f32, &PPC::VSRCRegClass);
      addRegisterClass(MVT::v2f64, &PPC::VSRCRegClass);
 
      if (Subtarget.hasP8Altivec()) {
        setOperationAction(ISD::SHL, MVT::v2i64, Legal);
        setOperationAction(ISD::SRA, MVT::v2i64, Legal);
        setOperationAction(ISD::SRL, MVT::v2i64, Legal);
 
        // 128 bit shifts can be accomplished via 3 instructions for SHL and
        // SRL, but not for SRA because of the instructions available:
        // VS{RL} and VS{RL}O. However due to direct move costs, it's not worth
        // doing
        setOperationAction(ISD::SHL, MVT::v1i128, Expand);
        setOperationAction(ISD::SRL, MVT::v1i128, Expand);
        setOperationAction(ISD::SRA, MVT::v1i128, Expand);
 
        setOperationAction(ISD::SETCC, MVT::v2i64, Legal);
      }
      else {
        setOperationAction(ISD::SHL, MVT::v2i64, Expand);
        setOperationAction(ISD::SRA, MVT::v2i64, Expand);
        setOperationAction(ISD::SRL, MVT::v2i64, Expand);
 
        setOperationAction(ISD::SETCC, MVT::v2i64, Custom);
 
        // VSX v2i64 only supports non-arithmetic operations.
        setOperationAction(ISD::ADD, MVT::v2i64, Expand);
        setOperationAction(ISD::SUB, MVT::v2i64, Expand);
      }
 
      if (Subtarget.isISA3_1())
        setOperationAction(ISD::SETCC, MVT::v1i128, Legal);
      else
        setOperationAction(ISD::SETCC, MVT::v1i128, Expand);
 
      setOperationAction(ISD::LOAD, MVT::v2i64, Promote);
      AddPromotedToType (ISD::LOAD, MVT::v2i64, MVT::v2f64);
      setOperationAction(ISD::STORE, MVT::v2i64, Promote);
      AddPromotedToType (ISD::STORE, MVT::v2i64, MVT::v2f64);
 
      setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v2i64, Custom);
 
      setOperationAction(ISD::STRICT_SINT_TO_FP, MVT::v2i64, Legal);
      setOperationAction(ISD::STRICT_UINT_TO_FP, MVT::v2i64, Legal);
      setOperationAction(ISD::STRICT_FP_TO_SINT, MVT::v2i64, Legal);
      setOperationAction(ISD::STRICT_FP_TO_UINT, MVT::v2i64, Legal);
      setOperationAction(ISD::SINT_TO_FP, MVT::v2i64, Legal);
      setOperationAction(ISD::UINT_TO_FP, MVT::v2i64, Legal);
      setOperationAction(ISD::FP_TO_SINT, MVT::v2i64, Legal);
      setOperationAction(ISD::FP_TO_UINT, MVT::v2i64, Legal);
 
      // Custom handling for partial vectors of integers converted to
      // floating point. We already have optimal handling for v2i32 through
      // the DAG combine, so those aren't necessary.
      setOperationAction(ISD::STRICT_UINT_TO_FP, MVT::v2i8, Custom);
      setOperationAction(ISD::STRICT_UINT_TO_FP, MVT::v4i8, Custom);
      setOperationAction(ISD::STRICT_UINT_TO_FP, MVT::v2i16, Custom);
      setOperationAction(ISD::STRICT_UINT_TO_FP, MVT::v4i16, Custom);
      setOperationAction(ISD::STRICT_SINT_TO_FP, MVT::v2i8, Custom);
      setOperationAction(ISD::STRICT_SINT_TO_FP, MVT::v4i8, Custom);
      setOperationAction(ISD::STRICT_SINT_TO_FP, MVT::v2i16, Custom);
      setOperationAction(ISD::STRICT_SINT_TO_FP, MVT::v4i16, Custom);
      setOperationAction(ISD::UINT_TO_FP, MVT::v2i8, Custom);
      setOperationAction(ISD::UINT_TO_FP, MVT::v4i8, Custom);
      setOperationAction(ISD::UINT_TO_FP, MVT::v2i16, Custom);
      setOperationAction(ISD::UINT_TO_FP, MVT::v4i16, Custom);
      setOperationAction(ISD::SINT_TO_FP, MVT::v2i8, Custom);
      setOperationAction(ISD::SINT_TO_FP, MVT::v4i8, Custom);
      setOperationAction(ISD::SINT_TO_FP, MVT::v2i16, Custom);
      setOperationAction(ISD::SINT_TO_FP, MVT::v4i16, Custom);
 
      setOperationAction(ISD::FNEG, MVT::v4f32, Legal);
      setOperationAction(ISD::FNEG, MVT::v2f64, Legal);
      setOperationAction(ISD::FABS, MVT::v4f32, Legal);
      setOperationAction(ISD::FABS, MVT::v2f64, Legal);
      setOperationAction(ISD::FCOPYSIGN, MVT::v4f32, Legal);
      setOperationAction(ISD::FCOPYSIGN, MVT::v2f64, Legal);
 
      setOperationAction(ISD::BUILD_VECTOR, MVT::v2i64, Custom);
      setOperationAction(ISD::BUILD_VECTOR, MVT::v2f64, Custom);
 
      // Handle constrained floating-point operations of vector.
      // The predictor is `hasVSX` because altivec instruction has
      // no exception but VSX vector instruction has.
      setOperationAction(ISD::STRICT_FADD, MVT::v4f32, Legal);
      setOperationAction(ISD::STRICT_FSUB, MVT::v4f32, Legal);
      setOperationAction(ISD::STRICT_FMUL, MVT::v4f32, Legal);
      setOperationAction(ISD::STRICT_FDIV, MVT::v4f32, Legal);
      setOperationAction(ISD::STRICT_FMA, MVT::v4f32, Legal);
      setOperationAction(ISD::STRICT_FSQRT, MVT::v4f32, Legal);
      setOperationAction(ISD::STRICT_FMAXNUM, MVT::v4f32, Legal);
      setOperationAction(ISD::STRICT_FMINNUM, MVT::v4f32, Legal);
      setOperationAction(ISD::STRICT_FRINT, MVT::v4f32, Legal);
      setOperationAction(ISD::STRICT_FFLOOR, MVT::v4f32, Legal);
      setOperationAction(ISD::STRICT_FCEIL,  MVT::v4f32, Legal);
      setOperationAction(ISD::STRICT_FTRUNC, MVT::v4f32, Legal);
      setOperationAction(ISD::STRICT_FROUND, MVT::v4f32, Legal);
 
      setOperationAction(ISD::STRICT_FADD, MVT::v2f64, Legal);
      setOperationAction(ISD::STRICT_FSUB, MVT::v2f64, Legal);
      setOperationAction(ISD::STRICT_FMUL, MVT::v2f64, Legal);
      setOperationAction(ISD::STRICT_FDIV, MVT::v2f64, Legal);
      setOperationAction(ISD::STRICT_FMA, MVT::v2f64, Legal);
      setOperationAction(ISD::STRICT_FSQRT, MVT::v2f64, Legal);
      setOperationAction(ISD::STRICT_FMAXNUM, MVT::v2f64, Legal);
      setOperationAction(ISD::STRICT_FMINNUM, MVT::v2f64, Legal);
      setOperationAction(ISD::STRICT_FRINT, MVT::v2f64, Legal);
      setOperationAction(ISD::STRICT_FFLOOR, MVT::v2f64, Legal);
      setOperationAction(ISD::STRICT_FCEIL,  MVT::v2f64, Legal);
      setOperationAction(ISD::STRICT_FTRUNC, MVT::v2f64, Legal);
      setOperationAction(ISD::STRICT_FROUND, MVT::v2f64, Legal);
 
      addRegisterClass(MVT::v2i64, &PPC::VSRCRegClass);
      addRegisterClass(MVT::f128, &PPC::VRRCRegClass);
 
      for (MVT FPT : MVT::fp_valuetypes())
        setLoadExtAction(ISD::EXTLOAD, MVT::f128, FPT, Expand);
 
      // Expand the SELECT to SELECT_CC
      setOperationAction(ISD::SELECT, MVT::f128, Expand);
 
      setTruncStoreAction(MVT::f128, MVT::f64, Expand);
      setTruncStoreAction(MVT::f128, MVT::f32, Expand);
 
      // No implementation for these ops for PowerPC.
      setOperationAction(ISD::FSIN, MVT::f128, Expand);
      setOperationAction(ISD::FCOS, MVT::f128, Expand);
      setOperationAction(ISD::FPOW, MVT::f128, Expand);
      setOperationAction(ISD::FPOWI, MVT::f128, Expand);
      setOperationAction(ISD::FREM, MVT::f128, Expand);
    }
 
    if (Subtarget.hasP8Altivec()) {
      addRegisterClass(MVT::v2i64, &PPC::VRRCRegClass);
      addRegisterClass(MVT::v1i128, &PPC::VRRCRegClass);
    }
 
    if (Subtarget.hasP9Vector()) {
      setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v4i32, Custom);
      setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v4f32, Custom);
 
      // Test data class instructions store results in CR bits.
      if (Subtarget.useCRBits()) {
        setOperationAction(ISD::IS_FPCLASS, MVT::f32, Custom);
        setOperationAction(ISD::IS_FPCLASS, MVT::f64, Custom);
        setOperationAction(ISD::IS_FPCLASS, MVT::f128, Custom);
      }
 
      // 128 bit shifts can be accomplished via 3 instructions for SHL and
      // SRL, but not for SRA because of the instructions available:
      // VS{RL} and VS{RL}O.
      setOperationAction(ISD::SHL, MVT::v1i128, Legal);
      setOperationAction(ISD::SRL, MVT::v1i128, Legal);
      setOperationAction(ISD::SRA, MVT::v1i128, Expand);
 
      setOperationAction(ISD::FADD, MVT::f128, Legal);
      setOperationAction(ISD::FSUB, MVT::f128, Legal);
      setOperationAction(ISD::FDIV, MVT::f128, Legal);
      setOperationAction(ISD::FMUL, MVT::f128, Legal);
      setOperationAction(ISD::FP_EXTEND, MVT::f128, Legal);
 
      setOperationAction(ISD::FMA, MVT::f128, Legal);
      setCondCodeAction(ISD::SETULT, MVT::f128, Expand);
      setCondCodeAction(ISD::SETUGT, MVT::f128, Expand);
      setCondCodeAction(ISD::SETUEQ, MVT::f128, Expand);
      setCondCodeAction(ISD::SETOGE, MVT::f128, Expand);
      setCondCodeAction(ISD::SETOLE, MVT::f128, Expand);
      setCondCodeAction(ISD::SETONE, MVT::f128, Expand);
 
      setOperationAction(ISD::FTRUNC, MVT::f128, Legal);
      setOperationAction(ISD::FRINT, MVT::f128, Legal);
      setOperationAction(ISD::FFLOOR, MVT::f128, Legal);
      setOperationAction(ISD::FCEIL, MVT::f128, Legal);
      setOperationAction(ISD::FNEARBYINT, MVT::f128, Legal);
      setOperationAction(ISD::FROUND, MVT::f128, Legal);
 
      setOperationAction(ISD::FP_ROUND, MVT::f64, Legal);
      setOperationAction(ISD::FP_ROUND, MVT::f32, Legal);
      setOperationAction(ISD::BITCAST, MVT::i128, Custom);
 
      // Handle constrained floating-point operations of fp128
      setOperationAction(ISD::STRICT_FADD, MVT::f128, Legal);
      setOperationAction(ISD::STRICT_FSUB, MVT::f128, Legal);
      setOperationAction(ISD::STRICT_FMUL, MVT::f128, Legal);
      setOperationAction(ISD::STRICT_FDIV, MVT::f128, Legal);
      setOperationAction(ISD::STRICT_FMA, MVT::f128, Legal);
      setOperationAction(ISD::STRICT_FSQRT, MVT::f128, Legal);
      setOperationAction(ISD::STRICT_FP_EXTEND, MVT::f128, Legal);
      setOperationAction(ISD::STRICT_FP_ROUND, MVT::f64, Legal);
      setOperationAction(ISD::STRICT_FP_ROUND, MVT::f32, Legal);
      setOperationAction(ISD::STRICT_FRINT, MVT::f128, Legal);
      setOperationAction(ISD::STRICT_FNEARBYINT, MVT::f128, Legal);
      setOperationAction(ISD::STRICT_FFLOOR, MVT::f128, Legal);
      setOperationAction(ISD::STRICT_FCEIL, MVT::f128, Legal);
      setOperationAction(ISD::STRICT_FTRUNC, MVT::f128, Legal);
      setOperationAction(ISD::STRICT_FROUND, MVT::f128, Legal);
      setOperationAction(ISD::FP_EXTEND, MVT::v2f32, Custom);
      setOperationAction(ISD::BSWAP, MVT::v8i16, Legal);
      setOperationAction(ISD::BSWAP, MVT::v4i32, Legal);
      setOperationAction(ISD::BSWAP, MVT::v2i64, Legal);
      setOperationAction(ISD::BSWAP, MVT::v1i128, Legal);
    } else if (Subtarget.hasVSX()) {
      setOperationAction(ISD::LOAD, MVT::f128, Promote);
      setOperationAction(ISD::STORE, MVT::f128, Promote);
 
      AddPromotedToType(ISD::LOAD, MVT::f128, MVT::v4i32);
      AddPromotedToType(ISD::STORE, MVT::f128, MVT::v4i32);
 
      // Set FADD/FSUB as libcall to avoid the legalizer to expand the
      // fp_to_uint and int_to_fp.
      setOperationAction(ISD::FADD, MVT::f128, LibCall);
      setOperationAction(ISD::FSUB, MVT::f128, LibCall);
 
      setOperationAction(ISD::FMUL, MVT::f128, Expand);
      setOperationAction(ISD::FDIV, MVT::f128, Expand);
      setOperationAction(ISD::FNEG, MVT::f128, Expand);
      setOperationAction(ISD::FABS, MVT::f128, Expand);
      setOperationAction(ISD::FSQRT, MVT::f128, Expand);
      setOperationAction(ISD::FMA, MVT::f128, Expand);
      setOperationAction(ISD::FCOPYSIGN, MVT::f128, Expand);
 
      // Expand the fp_extend if the target type is fp128.
      setOperationAction(ISD::FP_EXTEND, MVT::f128, Expand);
      setOperationAction(ISD::STRICT_FP_EXTEND, MVT::f128, Expand);
 
      // Expand the fp_round if the source type is fp128.
      for (MVT VT : {MVT::f32, MVT::f64}) {
        setOperationAction(ISD::FP_ROUND, VT, Custom);
        setOperationAction(ISD::STRICT_FP_ROUND, VT, Custom);
      }
 
      setOperationAction(ISD::SETCC, MVT::f128, Custom);
      setOperationAction(ISD::STRICT_FSETCC, MVT::f128, Custom);
      setOperationAction(ISD::STRICT_FSETCCS, MVT::f128, Custom);
      setOperationAction(ISD::BR_CC, MVT::f128, Expand);
 
      // Lower following f128 select_cc pattern:
      // select_cc x, y, tv, fv, cc -> select_cc (setcc x, y, cc), 0, tv, fv, NE
      setOperationAction(ISD::SELECT_CC, MVT::f128, Custom);
 
      // We need to handle f128 SELECT_CC with integer result type.
      setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
      setOperationAction(ISD::SELECT_CC, MVT::i64, isPPC64 ? Custom : Expand);
    }
 
    if (Subtarget.hasP9Altivec()) {
      if (Subtarget.isISA3_1()) {
        setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v2i64, Legal);
        setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v8i16, Legal);
        setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v16i8, Legal);
        setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v4i32, Legal);
      } else {
        setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v8i16, Custom);
        setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v16i8, Custom);
      }
      setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v4i8,  Legal);
      setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v4i16, Legal);
      setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v4i32, Legal);
      setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v2i8,  Legal);
      setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v2i16, Legal);
      setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v2i32, Legal);
      setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v2i64, Legal);
 
      setOperationAction(ISD::ABDU, MVT::v16i8, Legal);
      setOperationAction(ISD::ABDU, MVT::v8i16, Legal);
      setOperationAction(ISD::ABDU, MVT::v4i32, Legal);
      setOperationAction(ISD::ABDS, MVT::v4i32, Legal);
    }
 
    if (Subtarget.hasP10Vector()) {
      setOperationAction(ISD::SELECT_CC, MVT::f128, Custom);
    }
  }
 
  if (Subtarget.pairedVectorMemops()) {
    addRegisterClass(MVT::v256i1, &PPC::VSRpRCRegClass);
    setOperationAction(ISD::LOAD, MVT::v256i1, Custom);
    setOperationAction(ISD::STORE, MVT::v256i1, Custom);
  }
  if (Subtarget.hasMMA()) {
    if (Subtarget.isISAFuture())
      addRegisterClass(MVT::v512i1, &PPC::WACCRCRegClass);
    else
      addRegisterClass(MVT::v512i1, &PPC::UACCRCRegClass);
    setOperationAction(ISD::LOAD, MVT::v512i1, Custom);
    setOperationAction(ISD::STORE, MVT::v512i1, Custom);
    setOperationAction(ISD::BUILD_VECTOR, MVT::v512i1, Custom);
  }
 
  if (Subtarget.has64BitSupport())
    setOperationAction(ISD::PREFETCH, MVT::Other, Legal);
 
  if (Subtarget.isISA3_1())
    setOperationAction(ISD::SRA, MVT::v1i128, Legal);
 
  setOperationAction(ISD::READCYCLECOUNTER, MVT::i64, isPPC64 ? Legal : Custom);
 
  if (!isPPC64) {
    setOperationAction(ISD::ATOMIC_LOAD,  MVT::i64, Expand);
    setOperationAction(ISD::ATOMIC_STORE, MVT::i64, Expand);
  }
 
  if (shouldInlineQuadwordAtomics()) {
    setOperationAction(ISD::ATOMIC_LOAD, MVT::i128, Custom);
    setOperationAction(ISD::ATOMIC_STORE, MVT::i128, Custom);
    setOperationAction(ISD::INTRINSIC_VOID, MVT::i128, Custom);
  }
 
  setBooleanContents(ZeroOrOneBooleanContent);
 
  if (Subtarget.hasAltivec()) {
    // Altivec instructions set fields to all zeros or all ones.
    setBooleanVectorContents(ZeroOrNegativeOneBooleanContent);
  }
 
  setLibcallName(RTLIB::MULO_I128, nullptr);
  if (!isPPC64) {
    // These libcalls are not available in 32-bit.
    setLibcallName(RTLIB::SHL_I128, nullptr);
    setLibcallName(RTLIB::SRL_I128, nullptr);
    setLibcallName(RTLIB::SRA_I128, nullptr);
    setLibcallName(RTLIB::MUL_I128, nullptr);
    setLibcallName(RTLIB::MULO_I64, nullptr);
  }
 
  if (shouldInlineQuadwordAtomics())
    setMaxAtomicSizeInBitsSupported(128);
  else if (isPPC64)
    setMaxAtomicSizeInBitsSupported(64);
  else
    setMaxAtomicSizeInBitsSupported(32);
 
  setStackPointerRegisterToSaveRestore(isPPC64 ? PPC::X1 : PPC::R1);
 
  // We have target-specific dag combine patterns for the following nodes:
  setTargetDAGCombine({ISD::AND, ISD::ADD, ISD::SHL, ISD::SRA, ISD::SRL,
                       ISD::MUL, ISD::FMA, ISD::SINT_TO_FP, ISD::BUILD_VECTOR});
  if (Subtarget.hasFPCVT())
    setTargetDAGCombine(ISD::UINT_TO_FP);
  setTargetDAGCombine({ISD::LOAD, ISD::STORE, ISD::BR_CC});
  if (Subtarget.useCRBits())
    setTargetDAGCombine(ISD::BRCOND);
  setTargetDAGCombine({ISD::BSWAP, ISD::INTRINSIC_WO_CHAIN,
                       ISD::INTRINSIC_W_CHAIN, ISD::INTRINSIC_VOID});
 
  setTargetDAGCombine({ISD::SIGN_EXTEND, ISD::ZERO_EXTEND, ISD::ANY_EXTEND});
 
  setTargetDAGCombine({ISD::TRUNCATE, ISD::VECTOR_SHUFFLE});
 
  if (Subtarget.useCRBits()) {
    setTargetDAGCombine({ISD::TRUNCATE, ISD::SETCC, ISD::SELECT_CC});
  }
 
  setLibcallName(RTLIB::LOG_F128, "logf128");
  setLibcallName(RTLIB::LOG2_F128, "log2f128");
  setLibcallName(RTLIB::LOG10_F128, "log10f128");
  setLibcallName(RTLIB::EXP_F128, "expf128");
  setLibcallName(RTLIB::EXP2_F128, "exp2f128");
  setLibcallName(RTLIB::SIN_F128, "sinf128");
  setLibcallName(RTLIB::COS_F128, "cosf128");
  setLibcallName(RTLIB::POW_F128, "powf128");
  setLibcallName(RTLIB::FMIN_F128, "fminf128");
  setLibcallName(RTLIB::FMAX_F128, "fmaxf128");
  setLibcallName(RTLIB::REM_F128, "fmodf128");
  setLibcallName(RTLIB::SQRT_F128, "sqrtf128");
  setLibcallName(RTLIB::CEIL_F128, "ceilf128");
  setLibcallName(RTLIB::FLOOR_F128, "floorf128");
  setLibcallName(RTLIB::TRUNC_F128, "truncf128");
  setLibcallName(RTLIB::ROUND_F128, "roundf128");
  setLibcallName(RTLIB::LROUND_F128, "lroundf128");
  setLibcallName(RTLIB::LLROUND_F128, "llroundf128");
  setLibcallName(RTLIB::RINT_F128, "rintf128");
  setLibcallName(RTLIB::LRINT_F128, "lrintf128");
  setLibcallName(RTLIB::LLRINT_F128, "llrintf128");
  setLibcallName(RTLIB::NEARBYINT_F128, "nearbyintf128");
  setLibcallName(RTLIB::FMA_F128, "fmaf128");
  setLibcallName(RTLIB::FREXP_F128, "frexpf128");
 
  if (Subtarget.isAIXABI()) {
    setLibcallName(RTLIB::MEMCPY, isPPC64 ? "___memmove64" : "___memmove");
    setLibcallName(RTLIB::MEMMOVE, isPPC64 ? "___memmove64" : "___memmove");
    setLibcallName(RTLIB::MEMSET, isPPC64 ? "___memset64" : "___memset");
    setLibcallName(RTLIB::BZERO, isPPC64 ? "___bzero64" : "___bzero");
  }
 
  // With 32 condition bits, we don't need to sink (and duplicate) compares
  // aggressively in CodeGenPrep.
  if (Subtarget.useCRBits()) {
    setHasMultipleConditionRegisters();
    setJumpIsExpensive();
  }
 
  // TODO: The default entry number is set to 64. This stops most jump table
  // generation on PPC. But it is good for current PPC HWs because the indirect
  // branch instruction mtctr to the jump table may lead to bad branch predict.
  // Re-evaluate this value on future HWs that can do better with mtctr.
  setMinimumJumpTableEntries(PPCMinimumJumpTableEntries);
 
  setMinFunctionAlignment(Align(4));
 
  switch (Subtarget.getCPUDirective()) {
  default: break;
  case PPC::DIR_970:
  case PPC::DIR_A2:
  case PPC::DIR_E500:
  case PPC::DIR_E500mc:
  case PPC::DIR_E5500:
  case PPC::DIR_PWR4:
  case PPC::DIR_PWR5:
  case PPC::DIR_PWR5X:
  case PPC::DIR_PWR6:
  case PPC::DIR_PWR6X:
  case PPC::DIR_PWR7:
  case PPC::DIR_PWR8:
  case PPC::DIR_PWR9:
  case PPC::DIR_PWR10:
  case PPC::DIR_PWR_FUTURE:
    setPrefLoopAlignment(Align(16));
    setPrefFunctionAlignment(Align(16));
    break;
  }
 
  if (Subtarget.enableMachineScheduler())
    setSchedulingPreference(Sched::Source);
  else
    setSchedulingPreference(Sched::Hybrid);
 
  computeRegisterProperties(STI.getRegisterInfo());
 
  // The Freescale cores do better with aggressive inlining of memcpy and
  // friends. GCC uses same threshold of 128 bytes (= 32 word stores).
  if (Subtarget.getCPUDirective() == PPC::DIR_E500mc ||
      Subtarget.getCPUDirective() == PPC::DIR_E5500) {
    MaxStoresPerMemset = 32;
    MaxStoresPerMemsetOptSize = 16;
    MaxStoresPerMemcpy = 32;
    MaxStoresPerMemcpyOptSize = 8;
    MaxStoresPerMemmove = 32;
    MaxStoresPerMemmoveOptSize = 8;
  } else if (Subtarget.getCPUDirective() == PPC::DIR_A2) {
    // The A2 also benefits from (very) aggressive inlining of memcpy and
    // friends. The overhead of a the function call, even when warm, can be
    // over one hundred cycles.
    MaxStoresPerMemset = 128;
    MaxStoresPerMemcpy = 128;
    MaxStoresPerMemmove = 128;
    MaxLoadsPerMemcmp = 128;
  } else {
    MaxLoadsPerMemcmp = 8;
    MaxLoadsPerMemcmpOptSize = 4;
  }
 
  IsStrictFPEnabled = true;
 
  // Let the subtarget (CPU) decide if a predictable select is more expensive
  // than the corresponding branch. This information is used in CGP to decide
  // when to convert selects into branches.
  PredictableSelectIsExpensive = Subtarget.isPredictableSelectIsExpensive();
}
 
// *********************************** NOTE ************************************
// For selecting load and store instructions, the addressing modes are defined
// as ComplexPatterns in PPCInstrInfo.td, which are then utilized in the TD
// patterns to match the load the store instructions.
//
// The TD definitions for the addressing modes correspond to their respective
// Select<AddrMode>Form() function in PPCISelDAGToDAG.cpp. These functions rely
// on SelectOptimalAddrMode(), which calls computeMOFlags() to compute the
// address mode flags of a particular node. Afterwards, the computed address
// flags are passed into getAddrModeForFlags() in order to retrieve the optimal
// addressing mode. SelectOptimalAddrMode() then sets the Base and Displacement
// accordingly, based on the preferred addressing mode.
//
// Within PPCISelLowering.h, there are two enums: MemOpFlags and AddrMode.
// MemOpFlags contains all the possible flags that can be used to compute the
// optimal addressing mode for load and store instructions.
// AddrMode contains all the possible load and store addressing modes available
// on Power (such as DForm, DSForm, DQForm, XForm, etc.)
//
// When adding new load and store instructions, it is possible that new address
// flags may need to be added into MemOpFlags, and a new addressing mode will
// need to be added to AddrMode. An entry of the new addressing mode (consisting
// of the minimal and main distinguishing address flags for the new load/store
// instructions) will need to be added into initializeAddrModeMap() below.
// Finally, when adding new addressing modes, the getAddrModeForFlags() will
// need to be updated to account for selecting the optimal addressing mode.
// *****************************************************************************
/// Initialize the map that relates the different addressing modes of the load
/// and store instructions to a set of flags. This ensures the load/store
/// instruction is correctly matched during instruction selection.
void PPCTargetLowering::initializeAddrModeMap() {
  AddrModesMap[PPC::AM_DForm] = {
      // LWZ, STW
      PPC::MOF_ZExt | PPC::MOF_RPlusSImm16 | PPC::MOF_WordInt,
      PPC::MOF_ZExt | PPC::MOF_RPlusLo | PPC::MOF_WordInt,
      PPC::MOF_ZExt | PPC::MOF_NotAddNorCst | PPC::MOF_WordInt,
      PPC::MOF_ZExt | PPC::MOF_AddrIsSImm32 | PPC::MOF_WordInt,
      // LBZ, LHZ, STB, STH
      PPC::MOF_ZExt | PPC::MOF_RPlusSImm16 | PPC::MOF_SubWordInt,
      PPC::MOF_ZExt | PPC::MOF_RPlusLo | PPC::MOF_SubWordInt,
      PPC::MOF_ZExt | PPC::MOF_NotAddNorCst | PPC::MOF_SubWordInt,
      PPC::MOF_ZExt | PPC::MOF_AddrIsSImm32 | PPC::MOF_SubWordInt,
      // LHA
      PPC::MOF_SExt | PPC::MOF_RPlusSImm16 | PPC::MOF_SubWordInt,
      PPC::MOF_SExt | PPC::MOF_RPlusLo | PPC::MOF_SubWordInt,
      PPC::MOF_SExt | PPC::MOF_NotAddNorCst | PPC::MOF_SubWordInt,
      PPC::MOF_SExt | PPC::MOF_AddrIsSImm32 | PPC::MOF_SubWordInt,
      // LFS, LFD, STFS, STFD
      PPC::MOF_RPlusSImm16 | PPC::MOF_ScalarFloat | PPC::MOF_SubtargetBeforeP9,
      PPC::MOF_RPlusLo | PPC::MOF_ScalarFloat | PPC::MOF_SubtargetBeforeP9,
      PPC::MOF_NotAddNorCst | PPC::MOF_ScalarFloat | PPC::MOF_SubtargetBeforeP9,
      PPC::MOF_AddrIsSImm32 | PPC::MOF_ScalarFloat | PPC::MOF_SubtargetBeforeP9,
  };
  AddrModesMap[PPC::AM_DSForm] = {
      // LWA
      PPC::MOF_SExt | PPC::MOF_RPlusSImm16Mult4 | PPC::MOF_WordInt,
      PPC::MOF_SExt | PPC::MOF_NotAddNorCst | PPC::MOF_WordInt,
      PPC::MOF_SExt | PPC::MOF_AddrIsSImm32 | PPC::MOF_WordInt,
      // LD, STD
      PPC::MOF_RPlusSImm16Mult4 | PPC::MOF_DoubleWordInt,
      PPC::MOF_NotAddNorCst | PPC::MOF_DoubleWordInt,
      PPC::MOF_AddrIsSImm32 | PPC::MOF_DoubleWordInt,
      // DFLOADf32, DFLOADf64, DSTOREf32, DSTOREf64
      PPC::MOF_RPlusSImm16Mult4 | PPC::MOF_ScalarFloat | PPC::MOF_SubtargetP9,
      PPC::MOF_NotAddNorCst | PPC::MOF_ScalarFloat | PPC::MOF_SubtargetP9,
      PPC::MOF_AddrIsSImm32 | PPC::MOF_ScalarFloat | PPC::MOF_SubtargetP9,
  };
  AddrModesMap[PPC::AM_DQForm] = {
      // LXV, STXV
      PPC::MOF_RPlusSImm16Mult16 | PPC::MOF_Vector | PPC::MOF_SubtargetP9,
      PPC::MOF_NotAddNorCst | PPC::MOF_Vector | PPC::MOF_SubtargetP9,
      PPC::MOF_AddrIsSImm32 | PPC::MOF_Vector | PPC::MOF_SubtargetP9,
  };
  AddrModesMap[PPC::AM_PrefixDForm] = {PPC::MOF_RPlusSImm34 |
                                       PPC::MOF_SubtargetP10};
  // TODO: Add mapping for quadword load/store.
}
 
/// getMaxByValAlign - Helper for getByValTypeAlignment to determine
/// the desired ByVal argument alignment.
static void getMaxByValAlign(Type *Ty, Align &MaxAlign, Align MaxMaxAlign) {
  if (MaxAlign == MaxMaxAlign)
    return;
  if (VectorType *VTy = dyn_cast<VectorType>(Ty)) {
    if (MaxMaxAlign >= 32 &&
        VTy->getPrimitiveSizeInBits().getFixedValue() >= 256)
      MaxAlign = Align(32);
    else if (VTy->getPrimitiveSizeInBits().getFixedValue() >= 128 &&
             MaxAlign < 16)
      MaxAlign = Align(16);
  } else if (ArrayType *ATy = dyn_cast<ArrayType>(Ty)) {
    Align EltAlign;
    getMaxByValAlign(ATy->getElementType(), EltAlign, MaxMaxAlign);
    if (EltAlign > MaxAlign)
      MaxAlign = EltAlign;
  } else if (StructType *STy = dyn_cast<StructType>(Ty)) {
    for (auto *EltTy : STy->elements()) {
      Align EltAlign;
      getMaxByValAlign(EltTy, EltAlign, MaxMaxAlign);
      if (EltAlign > MaxAlign)
        MaxAlign = EltAlign;
      if (MaxAlign == MaxMaxAlign)
        break;
    }
  }
}
 
/// getByValTypeAlignment - Return the desired alignment for ByVal aggregate
/// function arguments in the caller parameter area.
uint64_t PPCTargetLowering::getByValTypeAlignment(Type *Ty,
                                                  const DataLayout &DL) const {
  // 16byte and wider vectors are passed on 16byte boundary.
  // The rest is 8 on PPC64 and 4 on PPC32 boundary.
  Align Alignment = Subtarget.isPPC64() ? Align(8) : Align(4);
  if (Subtarget.hasAltivec())
    getMaxByValAlign(Ty, Alignment, Align(16));
  return Alignment.value();
}
 
bool PPCTargetLowering::useSoftFloat() const {
  return Subtarget.useSoftFloat();
}
 
bool PPCTargetLowering::hasSPE() const {
  return Subtarget.hasSPE();
}
 
bool PPCTargetLowering::preferIncOfAddToSubOfNot(EVT VT) const {
  return VT.isScalarInteger();
}
 
bool PPCTargetLowering::shallExtractConstSplatVectorElementToStore(
    Type *VectorTy, unsigned ElemSizeInBits, unsigned &Index) const {
  if (!Subtarget.isPPC64() || !Subtarget.hasVSX())
    return false;
 
  if (auto *VTy = dyn_cast<VectorType>(VectorTy)) {
    if (VTy->getScalarType()->isIntegerTy()) {
      // ElemSizeInBits 8/16 can fit in immediate field, not needed here.
      if (ElemSizeInBits == 32) {
        Index = Subtarget.isLittleEndian() ? 2 : 1;
        return true;
      }
      if (ElemSizeInBits == 64) {
        Index = Subtarget.isLittleEndian() ? 1 : 0;
        return true;
      }
    }
  }
  return false;
}
 
const char *PPCTargetLowering::getTargetNodeName(unsigned Opcode) const {
  switch ((PPCISD::NodeType)Opcode) {
  case PPCISD::FIRST_NUMBER:    break;
  case PPCISD::FSEL:            return "PPCISD::FSEL";
  case PPCISD::XSMAXC:          return "PPCISD::XSMAXC";
  case PPCISD::XSMINC:          return "PPCISD::XSMINC";
  case PPCISD::FCFID:           return "PPCISD::FCFID";
  case PPCISD::FCFIDU:          return "PPCISD::FCFIDU";
  case PPCISD::FCFIDS:          return "PPCISD::FCFIDS";
  case PPCISD::FCFIDUS:         return "PPCISD::FCFIDUS";
  case PPCISD::FCTIDZ:          return "PPCISD::FCTIDZ";
  case PPCISD::FCTIWZ:          return "PPCISD::FCTIWZ";
  case PPCISD::FCTIDUZ:         return "PPCISD::FCTIDUZ";
  case PPCISD::FCTIWUZ:         return "PPCISD::FCTIWUZ";
  case PPCISD::FRE:             return "PPCISD::FRE";
  case PPCISD::FRSQRTE:         return "PPCISD::FRSQRTE";
  case PPCISD::FTSQRT:
    return "PPCISD::FTSQRT";
  case PPCISD::FSQRT:
    return "PPCISD::FSQRT";
  case PPCISD::STFIWX:          return "PPCISD::STFIWX";
  case PPCISD::VPERM:           return "PPCISD::VPERM";
  case PPCISD::XXSPLT:          return "PPCISD::XXSPLT";
  case PPCISD::XXSPLTI_SP_TO_DP:
    return "PPCISD::XXSPLTI_SP_TO_DP";
  case PPCISD::XXSPLTI32DX:
    return "PPCISD::XXSPLTI32DX";
  case PPCISD::VECINSERT:       return "PPCISD::VECINSERT";
  case PPCISD::XXPERMDI:        return "PPCISD::XXPERMDI";
  case PPCISD::XXPERM:
    return "PPCISD::XXPERM";
  case PPCISD::VECSHL:          return "PPCISD::VECSHL";
  case PPCISD::CMPB:            return "PPCISD::CMPB";
  case PPCISD::Hi:              return "PPCISD::Hi";
  case PPCISD::Lo:              return "PPCISD::Lo";
  case PPCISD::TOC_ENTRY:       return "PPCISD::TOC_ENTRY";
  case PPCISD::ATOMIC_CMP_SWAP_8: return "PPCISD::ATOMIC_CMP_SWAP_8";
  case PPCISD::ATOMIC_CMP_SWAP_16: return "PPCISD::ATOMIC_CMP_SWAP_16";
  case PPCISD::DYNALLOC:        return "PPCISD::DYNALLOC";
  case PPCISD::DYNAREAOFFSET:   return "PPCISD::DYNAREAOFFSET";
  case PPCISD::PROBED_ALLOCA:   return "PPCISD::PROBED_ALLOCA";
  case PPCISD::GlobalBaseReg:   return "PPCISD::GlobalBaseReg";
  case PPCISD::SRL:             return "PPCISD::SRL";
  case PPCISD::SRA:             return "PPCISD::SRA";
  case PPCISD::SHL:             return "PPCISD::SHL";
  case PPCISD::SRA_ADDZE:       return "PPCISD::SRA_ADDZE";
  case PPCISD::CALL:            return "PPCISD::CALL";
  case PPCISD::CALL_NOP:        return "PPCISD::CALL_NOP";
  case PPCISD::CALL_NOTOC:      return "PPCISD::CALL_NOTOC";
  case PPCISD::CALL_RM:
    return "PPCISD::CALL_RM";
  case PPCISD::CALL_NOP_RM:
    return "PPCISD::CALL_NOP_RM";
  case PPCISD::CALL_NOTOC_RM:
    return "PPCISD::CALL_NOTOC_RM";
  case PPCISD::MTCTR:           return "PPCISD::MTCTR";
  case PPCISD::BCTRL:           return "PPCISD::BCTRL";
  case PPCISD::BCTRL_LOAD_TOC:  return "PPCISD::BCTRL_LOAD_TOC";
  case PPCISD::BCTRL_RM:
    return "PPCISD::BCTRL_RM";
  case PPCISD::BCTRL_LOAD_TOC_RM:
    return "PPCISD::BCTRL_LOAD_TOC_RM";
  case PPCISD::RET_GLUE:        return "PPCISD::RET_GLUE";
  case PPCISD::READ_TIME_BASE:  return "PPCISD::READ_TIME_BASE";
  case PPCISD::EH_SJLJ_SETJMP:  return "PPCISD::EH_SJLJ_SETJMP";
  case PPCISD::EH_SJLJ_LONGJMP: return "PPCISD::EH_SJLJ_LONGJMP";
  case PPCISD::MFOCRF:          return "PPCISD::MFOCRF";
  case PPCISD::MFVSR:           return "PPCISD::MFVSR";
  case PPCISD::MTVSRA:          return "PPCISD::MTVSRA";
  case PPCISD::MTVSRZ:          return "PPCISD::MTVSRZ";
  case PPCISD::SINT_VEC_TO_FP:  return "PPCISD::SINT_VEC_TO_FP";
  case PPCISD::UINT_VEC_TO_FP:  return "PPCISD::UINT_VEC_TO_FP";
  case PPCISD::SCALAR_TO_VECTOR_PERMUTED:
    return "PPCISD::SCALAR_TO_VECTOR_PERMUTED";
  case PPCISD::ANDI_rec_1_EQ_BIT:
    return "PPCISD::ANDI_rec_1_EQ_BIT";
  case PPCISD::ANDI_rec_1_GT_BIT:
    return "PPCISD::ANDI_rec_1_GT_BIT";
  case PPCISD::VCMP:            return "PPCISD::VCMP";
  case PPCISD::VCMP_rec:        return "PPCISD::VCMP_rec";
  case PPCISD::LBRX:            return "PPCISD::LBRX";
  case PPCISD::STBRX:           return "PPCISD::STBRX";
  case PPCISD::LFIWAX:          return "PPCISD::LFIWAX";
  case PPCISD::LFIWZX:          return "PPCISD::LFIWZX";
  case PPCISD::LXSIZX:          return "PPCISD::LXSIZX";
  case PPCISD::STXSIX:          return "PPCISD::STXSIX";
  case PPCISD::VEXTS:           return "PPCISD::VEXTS";
  case PPCISD::LXVD2X:          return "PPCISD::LXVD2X";
  case PPCISD::STXVD2X:         return "PPCISD::STXVD2X";
  case PPCISD::LOAD_VEC_BE:     return "PPCISD::LOAD_VEC_BE";
  case PPCISD::STORE_VEC_BE:    return "PPCISD::STORE_VEC_BE";
  case PPCISD::ST_VSR_SCAL_INT:
                                return "PPCISD::ST_VSR_SCAL_INT";
  case PPCISD::COND_BRANCH:     return "PPCISD::COND_BRANCH";
  case PPCISD::BDNZ:            return "PPCISD::BDNZ";
  case PPCISD::BDZ:             return "PPCISD::BDZ";
  case PPCISD::MFFS:            return "PPCISD::MFFS";
  case PPCISD::FADDRTZ:         return "PPCISD::FADDRTZ";
  case PPCISD::TC_RETURN:       return "PPCISD::TC_RETURN";
  case PPCISD::CR6SET:          return "PPCISD::CR6SET";
  case PPCISD::CR6UNSET:        return "PPCISD::CR6UNSET";
  case PPCISD::PPC32_GOT:       return "PPCISD::PPC32_GOT";
  case PPCISD::PPC32_PICGOT:    return "PPCISD::PPC32_PICGOT";
  case PPCISD::ADDIS_GOT_TPREL_HA: return "PPCISD::ADDIS_GOT_TPREL_HA";
  case PPCISD::LD_GOT_TPREL_L:  return "PPCISD::LD_GOT_TPREL_L";
  case PPCISD::ADD_TLS:         return "PPCISD::ADD_TLS";
  case PPCISD::ADDIS_TLSGD_HA:  return "PPCISD::ADDIS_TLSGD_HA";
  case PPCISD::ADDI_TLSGD_L:    return "PPCISD::ADDI_TLSGD_L";
  case PPCISD::GET_TLS_ADDR:    return "PPCISD::GET_TLS_ADDR";
  case PPCISD::GET_TPOINTER:    return "PPCISD::GET_TPOINTER";
  case PPCISD::ADDI_TLSGD_L_ADDR: return "PPCISD::ADDI_TLSGD_L_ADDR";
  case PPCISD::TLSGD_AIX:       return "PPCISD::TLSGD_AIX";
  case PPCISD::ADDIS_TLSLD_HA:  return "PPCISD::ADDIS_TLSLD_HA";
  case PPCISD::ADDI_TLSLD_L:    return "PPCISD::ADDI_TLSLD_L";
  case PPCISD::GET_TLSLD_ADDR:  return "PPCISD::GET_TLSLD_ADDR";
  case PPCISD::ADDI_TLSLD_L_ADDR: return "PPCISD::ADDI_TLSLD_L_ADDR";
  case PPCISD::ADDIS_DTPREL_HA: return "PPCISD::ADDIS_DTPREL_HA";
  case PPCISD::ADDI_DTPREL_L:   return "PPCISD::ADDI_DTPREL_L";
  case PPCISD::PADDI_DTPREL:
    return "PPCISD::PADDI_DTPREL";
  case PPCISD::VADD_SPLAT:      return "PPCISD::VADD_SPLAT";
  case PPCISD::SC:              return "PPCISD::SC";
  case PPCISD::CLRBHRB:         return "PPCISD::CLRBHRB";
  case PPCISD::MFBHRBE:         return "PPCISD::MFBHRBE";
  case PPCISD::RFEBB:           return "PPCISD::RFEBB";
  case PPCISD::XXSWAPD:         return "PPCISD::XXSWAPD";
  case PPCISD::SWAP_NO_CHAIN:   return "PPCISD::SWAP_NO_CHAIN";
  case PPCISD::BUILD_FP128:     return "PPCISD::BUILD_FP128";
  case PPCISD::BUILD_SPE64:     return "PPCISD::BUILD_SPE64";
  case PPCISD::EXTRACT_SPE:     return "PPCISD::EXTRACT_SPE";
  case PPCISD::EXTSWSLI:        return "PPCISD::EXTSWSLI";
  case PPCISD::LD_VSX_LH:       return "PPCISD::LD_VSX_LH";
  case PPCISD::FP_EXTEND_HALF:  return "PPCISD::FP_EXTEND_HALF";
  case PPCISD::MAT_PCREL_ADDR:  return "PPCISD::MAT_PCREL_ADDR";
  case PPCISD::TLS_DYNAMIC_MAT_PCREL_ADDR:
    return "PPCISD::TLS_DYNAMIC_MAT_PCREL_ADDR";
  case PPCISD::TLS_LOCAL_EXEC_MAT_ADDR:
    return "PPCISD::TLS_LOCAL_EXEC_MAT_ADDR";
  case PPCISD::ACC_BUILD:       return "PPCISD::ACC_BUILD";
  case PPCISD::PAIR_BUILD:      return "PPCISD::PAIR_BUILD";
  case PPCISD::EXTRACT_VSX_REG: return "PPCISD::EXTRACT_VSX_REG";
  case PPCISD::XXMFACC:         return "PPCISD::XXMFACC";
  case PPCISD::LD_SPLAT:        return "PPCISD::LD_SPLAT";
  case PPCISD::ZEXT_LD_SPLAT:   return "PPCISD::ZEXT_LD_SPLAT";
  case PPCISD::SEXT_LD_SPLAT:   return "PPCISD::SEXT_LD_SPLAT";
  case PPCISD::FNMSUB:          return "PPCISD::FNMSUB";
  case PPCISD::STRICT_FADDRTZ:
    return "PPCISD::STRICT_FADDRTZ";
  case PPCISD::STRICT_FCTIDZ:
    return "PPCISD::STRICT_FCTIDZ";
  case PPCISD::STRICT_FCTIWZ:
    return "PPCISD::STRICT_FCTIWZ";
  case PPCISD::STRICT_FCTIDUZ:
    return "PPCISD::STRICT_FCTIDUZ";
  case PPCISD::STRICT_FCTIWUZ:
    return "PPCISD::STRICT_FCTIWUZ";
  case PPCISD::STRICT_FCFID:
    return "PPCISD::STRICT_FCFID";
  case PPCISD::STRICT_FCFIDU:
    return "PPCISD::STRICT_FCFIDU";
  case PPCISD::STRICT_FCFIDS:
    return "PPCISD::STRICT_FCFIDS";
  case PPCISD::STRICT_FCFIDUS:
    return "PPCISD::STRICT_FCFIDUS";
  case PPCISD::LXVRZX:          return "PPCISD::LXVRZX";
  case PPCISD::STORE_COND:
    return "PPCISD::STORE_COND";
  }
  return nullptr;
}
 
EVT PPCTargetLowering::getSetCCResultType(const DataLayout &DL, LLVMContext &C,
                                          EVT VT) const {
  if (!VT.isVector())
    return Subtarget.useCRBits() ? MVT::i1 : MVT::i32;
 
  return VT.changeVectorElementTypeToInteger();
}
 
bool PPCTargetLowering::enableAggressiveFMAFusion(EVT VT) const {
  assert(VT.isFloatingPoint() && "Non-floating-point FMA?");
  return true;
}
 
//===----------------------------------------------------------------------===//
// Node matching predicates, for use by the tblgen matching code.
//===----------------------------------------------------------------------===//
 
/// isFloatingPointZero - Return true if this is 0.0 or -0.0.
static bool isFloatingPointZero(SDValue Op) {
  if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Op))
    return CFP->getValueAPF().isZero();
  else if (ISD::isEXTLoad(Op.getNode()) || ISD::isNON_EXTLoad(Op.getNode())) {
    // Maybe this has already been legalized into the constant pool?
    if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(Op.getOperand(1)))
      if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CP->getConstVal()))
        return CFP->getValueAPF().isZero();
  }
  return false;
}
 
/// isConstantOrUndef - Op is either an undef node or a ConstantSDNode.  Return
/// true if Op is undef or if it matches the specified value.
static bool isConstantOrUndef(int Op, int Val) {
  return Op < 0 || Op == Val;
}
 
/// isVPKUHUMShuffleMask - Return true if this is the shuffle mask for a
/// VPKUHUM instruction.
/// The ShuffleKind distinguishes between big-endian operations with
/// two different inputs (0), either-endian operations with two identical
/// inputs (1), and little-endian operations with two different inputs (2).
/// For the latter, the input operands are swapped (see PPCInstrAltivec.td).
bool PPC::isVPKUHUMShuffleMask(ShuffleVectorSDNode *N, unsigned ShuffleKind,
                               SelectionDAG &DAG) {
  bool IsLE = DAG.getDataLayout().isLittleEndian();
  if (ShuffleKind == 0) {
    if (IsLE)
      return false;
    for (unsigned i = 0; i != 16; ++i)
      if (!isConstantOrUndef(N->getMaskElt(i), i*2+1))
        return false;
  } else if (ShuffleKind == 2) {
    if (!IsLE)
      return false;
    for (unsigned i = 0; i != 16; ++i)
      if (!isConstantOrUndef(N->getMaskElt(i), i*2))
        return false;
  } else if (ShuffleKind == 1) {
    unsigned j = IsLE ? 0 : 1;
    for (unsigned i = 0; i != 8; ++i)
      if (!isConstantOrUndef(N->getMaskElt(i),    i*2+j) ||
          !isConstantOrUndef(N->getMaskElt(i+8),  i*2+j))
        return false;
  }
  return true;
}
 
/// isVPKUWUMShuffleMask - Return true if this is the shuffle mask for a
/// VPKUWUM instruction.
/// The ShuffleKind distinguishes between big-endian operations with
/// two different inputs (0), either-endian operations with two identical
/// inputs (1), and little-endian operations with two different inputs (2).
/// For the latter, the input operands are swapped (see PPCInstrAltivec.td).
bool PPC::isVPKUWUMShuffleMask(ShuffleVectorSDNode *N, unsigned ShuffleKind,
                               SelectionDAG &DAG) {
  bool IsLE = DAG.getDataLayout().isLittleEndian();
  if (ShuffleKind == 0) {
    if (IsLE)
      return false;
    for (unsigned i = 0; i != 16; i += 2)
      if (!isConstantOrUndef(N->getMaskElt(i  ),  i*2+2) ||
          !isConstantOrUndef(N->getMaskElt(i+1),  i*2+3))
        return false;
  } else if (ShuffleKind == 2) {
    if (!IsLE)
      return false;
    for (unsigned i = 0; i != 16; i += 2)
      if (!isConstantOrUndef(N->getMaskElt(i  ),  i*2) ||
          !isConstantOrUndef(N->getMaskElt(i+1),  i*2+1))
        return false;
  } else if (ShuffleKind == 1) {
    unsigned j = IsLE ? 0 : 2;
    for (unsigned i = 0; i != 8; i += 2)
      if (!isConstantOrUndef(N->getMaskElt(i  ),  i*2+j)   ||
          !isConstantOrUndef(N->getMaskElt(i+1),  i*2+j+1) ||
          !isConstantOrUndef(N->getMaskElt(i+8),  i*2+j)   ||
          !isConstantOrUndef(N->getMaskElt(i+9),  i*2+j+1))
        return false;
  }
  return true;
}
 
/// isVPKUDUMShuffleMask - Return true if this is the shuffle mask for a
/// VPKUDUM instruction, AND the VPKUDUM instruction exists for the
/// current subtarget.
///
/// The ShuffleKind distinguishes between big-endian operations with
/// two different inputs (0), either-endian operations with two identical
/// inputs (1), and little-endian operations with two different inputs (2).
/// For the latter, the input operands are swapped (see PPCInstrAltivec.td).
bool PPC::isVPKUDUMShuffleMask(ShuffleVectorSDNode *N, unsigned ShuffleKind,
                               SelectionDAG &DAG) {
  const PPCSubtarget &Subtarget = DAG.getSubtarget<PPCSubtarget>();
  if (!Subtarget.hasP8Vector())
    return false;
 
  bool IsLE = DAG.getDataLayout().isLittleEndian();
  if (ShuffleKind == 0) {
    if (IsLE)
      return false;
    for (unsigned i = 0; i != 16; i += 4)
      if (!isConstantOrUndef(N->getMaskElt(i  ),  i*2+4) ||
          !isConstantOrUndef(N->getMaskElt(i+1),  i*2+5) ||
          !isConstantOrUndef(N->getMaskElt(i+2),  i*2+6) ||
          !isConstantOrUndef(N->getMaskElt(i+3),  i*2+7))
        return false;
  } else if (ShuffleKind == 2) {
    if (!IsLE)
      return false;
    for (unsigned i = 0; i != 16; i += 4)
      if (!isConstantOrUndef(N->getMaskElt(i  ),  i*2) ||
          !isConstantOrUndef(N->getMaskElt(i+1),  i*2+1) ||
          !isConstantOrUndef(N->getMaskElt(i+2),  i*2+2) ||
          !isConstantOrUndef(N->getMaskElt(i+3),  i*2+3))
        return false;
  } else if (ShuffleKind == 1) {
    unsigned j = IsLE ? 0 : 4;
    for (unsigned i = 0; i != 8; i += 4)
      if (!isConstantOrUndef(N->getMaskElt(i  ),  i*2+j)   ||
          !isConstantOrUndef(N->getMaskElt(i+1),  i*2+j+1) ||
          !isConstantOrUndef(N->getMaskElt(i+2),  i*2+j+2) ||
          !isConstantOrUndef(N->getMaskElt(i+3),  i*2+j+3) ||
          !isConstantOrUndef(N->getMaskElt(i+8),  i*2+j)   ||
          !isConstantOrUndef(N->getMaskElt(i+9),  i*2+j+1) ||
          !isConstantOrUndef(N->getMaskElt(i+10), i*2+j+2) ||
          !isConstantOrUndef(N->getMaskElt(i+11), i*2+j+3))
        return false;
  }
  return true;
}
 
/// isVMerge - Common function, used to match vmrg* shuffles.
///
static bool isVMerge(ShuffleVectorSDNode *N, unsigned UnitSize,
                     unsigned LHSStart, unsigned RHSStart) {
  if (N->getValueType(0) != MVT::v16i8)
    return false;
  assert((UnitSize == 1 || UnitSize == 2 || UnitSize == 4) &&
         "Unsupported merge size!");
 
  for (unsigned i = 0; i != 8/UnitSize; ++i)     // Step over units
    for (unsigned j = 0; j != UnitSize; ++j) {   // Step over bytes within unit
      if (!isConstantOrUndef(N->getMaskElt(i*UnitSize*2+j),
                             LHSStart+j+i*UnitSize) ||
          !isConstantOrUndef(N->getMaskElt(i*UnitSize*2+UnitSize+j),
                             RHSStart+j+i*UnitSize))
        return false;
    }
  return true;
}
 
/// isVMRGLShuffleMask - Return true if this is a shuffle mask suitable for
/// a VMRGL* instruction with the specified unit size (1,2 or 4 bytes).
/// The ShuffleKind distinguishes between big-endian merges with two
/// different inputs (0), either-endian merges with two identical inputs (1),
/// and little-endian merges with two different inputs (2).  For the latter,
/// the input operands are swapped (see PPCInstrAltivec.td).
bool PPC::isVMRGLShuffleMask(ShuffleVectorSDNode *N, unsigned UnitSize,
                             unsigned ShuffleKind, SelectionDAG &DAG) {
  if (DAG.getDataLayout().isLittleEndian()) {
    if (ShuffleKind == 1) // unary
      return isVMerge(N, UnitSize, 0, 0);
    else if (ShuffleKind == 2) // swapped
      return isVMerge(N, UnitSize, 0, 16);
    else
      return false;
  } else {
    if (ShuffleKind == 1) // unary
      return isVMerge(N, UnitSize, 8, 8);
    else if (ShuffleKind == 0) // normal
      return isVMerge(N, UnitSize, 8, 24);
    else
      return false;
  }
}
 
/// isVMRGHShuffleMask - Return true if this is a shuffle mask suitable for
/// a VMRGH* instruction with the specified unit size (1,2 or 4 bytes).
/// The ShuffleKind distinguishes between big-endian merges with two
/// different inputs (0), either-endian merges with two identical inputs (1),
/// and little-endian merges with two different inputs (2).  For the latter,
/// the input operands are swapped (see PPCInstrAltivec.td).
bool PPC::isVMRGHShuffleMask(ShuffleVectorSDNode *N, unsigned UnitSize,
                             unsigned ShuffleKind, SelectionDAG &DAG) {
  if (DAG.getDataLayout().isLittleEndian()) {
    if (ShuffleKind == 1) // unary
      return isVMerge(N, UnitSize, 8, 8);
    else if (ShuffleKind == 2) // swapped
      return isVMerge(N, UnitSize, 8, 24);
    else
      return false;
  } else {
    if (ShuffleKind == 1) // unary
      return isVMerge(N, UnitSize, 0, 0);
    else if (ShuffleKind == 0) // normal
      return isVMerge(N, UnitSize, 0, 16);
    else
      return false;
  }
}
 
/**
 * Common function used to match vmrgew and vmrgow shuffles
 *
 * The indexOffset determines whether to look for even or odd words in
 * the shuffle mask. This is based on the of the endianness of the target
 * machine.
 *   - Little Endian:
 *     - Use offset of 0 to check for odd elements
 *     - Use offset of 4 to check for even elements
 *   - Big Endian:
 *     - Use offset of 0 to check for even elements
 *     - Use offset of 4 to check for odd elements
 * A detailed description of the vector element ordering for little endian and
 * big endian can be found at
 * http://www.ibm.com/developerworks/library/l-ibm-xl-c-cpp-compiler/index.html
 * Targeting your applications - what little endian and big endian IBM XL C/C++
 * compiler differences mean to you
 *
 * The mask to the shuffle vector instruction specifies the indices of the
 * elements from the two input vectors to place in the result. The elements are
 * numbered in array-access order, starting with the first vector. These vectors
 * are always of type v16i8, thus each vector will contain 16 elements of size
 * 8. More info on the shuffle vector can be found in the
 * http://llvm.org/docs/LangRef.html#shufflevector-instruction
 * Language Reference.
 *
 * The RHSStartValue indicates whether the same input vectors are used (unary)
 * or two different input vectors are used, based on the following:
 *   - If the instruction uses the same vector for both inputs, the range of the
 *     indices will be 0 to 15. In this case, the RHSStart value passed should
 *     be 0.
 *   - If the instruction has two different vectors then the range of the
 *     indices will be 0 to 31. In this case, the RHSStart value passed should
 *     be 16 (indices 0-15 specify elements in the first vector while indices 16
 *     to 31 specify elements in the second vector).
 *
 * \param[in] N The shuffle vector SD Node to analyze
 * \param[in] IndexOffset Specifies whether to look for even or odd elements
 * \param[in] RHSStartValue Specifies the starting index for the righthand input
 * vector to the shuffle_vector instruction
 * \return true iff this shuffle vector represents an even or odd word merge
 */
static bool isVMerge(ShuffleVectorSDNode *N, unsigned IndexOffset,
                     unsigned RHSStartValue) {
  if (N->getValueType(0) != MVT::v16i8)
    return false;
 
  for (unsigned i = 0; i < 2; ++i)
    for (unsigned j = 0; j < 4; ++j)
      if (!isConstantOrUndef(N->getMaskElt(i*4+j),
                             i*RHSStartValue+j+IndexOffset) ||
          !isConstantOrUndef(N->getMaskElt(i*4+j+8),
                             i*RHSStartValue+j+IndexOffset+8))
        return false;
  return true;
}
 
/**
 * Determine if the specified shuffle mask is suitable for the vmrgew or
 * vmrgow instructions.
 *
 * \param[in] N The shuffle vector SD Node to analyze
 * \param[in] CheckEven Check for an even merge (true) or an odd merge (false)
 * \param[in] ShuffleKind Identify the type of merge:
 *   - 0 = big-endian merge with two different inputs;
 *   - 1 = either-endian merge with two identical inputs;
 *   - 2 = little-endian merge with two different inputs (inputs are swapped for
 *     little-endian merges).
 * \param[in] DAG The current SelectionDAG
 * \return true iff this shuffle mask
 */
bool PPC::isVMRGEOShuffleMask(ShuffleVectorSDNode *N, bool CheckEven,
                              unsigned ShuffleKind, SelectionDAG &DAG) {
  if (DAG.getDataLayout().isLittleEndian()) {
    unsigned indexOffset = CheckEven ? 4 : 0;
    if (ShuffleKind == 1) // Unary
      return isVMerge(N, indexOffset, 0);
    else if (ShuffleKind == 2) // swapped
      return isVMerge(N, indexOffset, 16);
    else
      return false;
  }
  else {
    unsigned indexOffset = CheckEven ? 0 : 4;
    if (ShuffleKind == 1) // Unary
      return isVMerge(N, indexOffset, 0);
    else if (ShuffleKind == 0) // Normal
      return isVMerge(N, indexOffset, 16);
    else
      return false;
  }
  return false;
}
 
/// isVSLDOIShuffleMask - If this is a vsldoi shuffle mask, return the shift
/// amount, otherwise return -1.
/// The ShuffleKind distinguishes between big-endian operations with two
/// different inputs (0), either-endian operations with two identical inputs
/// (1), and little-endian operations with two different inputs (2).  For the
/// latter, the input operands are swapped (see PPCInstrAltivec.td).
int PPC::isVSLDOIShuffleMask(SDNode *N, unsigned ShuffleKind,
                             SelectionDAG &DAG) {
  if (N->getValueType(0) != MVT::v16i8)
    return -1;
 
  ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(N);
 
  // Find the first non-undef value in the shuffle mask.
  unsigned i;
  for (i = 0; i != 16 && SVOp->getMaskElt(i) < 0; ++i)
    /*search*/;
 
  if (i == 16) return -1;  // all undef.
 
  // Otherwise, check to see if the rest of the elements are consecutively
  // numbered from this value.
  unsigned ShiftAmt = SVOp->getMaskElt(i);
  if (ShiftAmt < i) return -1;
 
  ShiftAmt -= i;
  bool isLE = DAG.getDataLayout().isLittleEndian();
 
  if ((ShuffleKind == 0 && !isLE) || (ShuffleKind == 2 && isLE)) {
    // Check the rest of the elements to see if they are consecutive.
    for (++i; i != 16; ++i)
      if (!isConstantOrUndef(SVOp->getMaskElt(i), ShiftAmt+i))
        return -1;
  } else if (ShuffleKind == 1) {
    // Check the rest of the elements to see if they are consecutive.
    for (++i; i != 16; ++i)
      if (!isConstantOrUndef(SVOp->getMaskElt(i), (ShiftAmt+i) & 15))
        return -1;
  } else
    return -1;
 
  if (isLE)
    ShiftAmt = 16 - ShiftAmt;
 
  return ShiftAmt;
}
 
/// isSplatShuffleMask - Return true if the specified VECTOR_SHUFFLE operand
/// specifies a splat of a single element that is suitable for input to
/// one of the splat operations (VSPLTB/VSPLTH/VSPLTW/XXSPLTW/LXVDSX/etc.).
bool PPC::isSplatShuffleMask(ShuffleVectorSDNode *N, unsigned EltSize) {
  EVT VT = N->getValueType(0);
  if (VT == MVT::v2i64 || VT == MVT::v2f64)
    return EltSize == 8 && N->getMaskElt(0) == N->getMaskElt(1);
 
  assert(VT == MVT::v16i8 && isPowerOf2_32(EltSize) &&
         EltSize <= 8 && "Can only handle 1,2,4,8 byte element sizes");
 
  // The consecutive indices need to specify an element, not part of two
  // different elements.  So abandon ship early if this isn't the case.
  if (N->getMaskElt(0) % EltSize != 0)
    return false;
 
  // This is a splat operation if each element of the permute is the same, and
  // if the value doesn't reference the second vector.
  unsigned ElementBase = N->getMaskElt(0);
 
  // FIXME: Handle UNDEF elements too!
  if (ElementBase >= 16)
    return false;
 
  // Check that the indices are consecutive, in the case of a multi-byte element
  // splatted with a v16i8 mask.
  for (unsigned i = 1; i != EltSize; ++i)
    if (N->getMaskElt(i) < 0 || N->getMaskElt(i) != (int)(i+ElementBase))
      return false;
 
  for (unsigned i = EltSize, e = 16; i != e; i += EltSize) {
    if (N->getMaskElt(i) < 0) continue;
    for (unsigned j = 0; j != EltSize; ++j)
      if (N->getMaskElt(i+j) != N->getMaskElt(j))
        return false;
  }
  return true;
}
 
/// Check that the mask is shuffling N byte elements. Within each N byte
/// element of the mask, the indices could be either in increasing or
/// decreasing order as long as they are consecutive.
/// \param[in] N the shuffle vector SD Node to analyze
/// \param[in] Width the element width in bytes, could be 2/4/8/16 (HalfWord/
/// Word/DoubleWord/QuadWord).
/// \param[in] StepLen the delta indices number among the N byte element, if
/// the mask is in increasing/decreasing order then it is 1/-1.
/// \return true iff the mask is shuffling N byte elements.
static bool isNByteElemShuffleMask(ShuffleVectorSDNode *N, unsigned Width,
                                   int StepLen) {
  assert((Width == 2 || Width == 4 || Width == 8 || Width == 16) &&
         "Unexpected element width.");
  assert((StepLen == 1 || StepLen == -1) && "Unexpected element width.");
 
  unsigned NumOfElem = 16 / Width;
  unsigned MaskVal[16]; //  Width is never greater than 16
  for (unsigned i = 0; i < NumOfElem; ++i) {
    MaskVal[0] = N->getMaskElt(i * Width);
    if ((StepLen == 1) && (MaskVal[0] % Width)) {
      return false;
    } else if ((StepLen == -1) && ((MaskVal[0] + 1) % Width)) {
      return false;
    }
 
    for (unsigned int j = 1; j < Width; ++j) {
      MaskVal[j] = N->getMaskElt(i * Width + j);
      if (MaskVal[j] != MaskVal[j-1] + StepLen) {
        return false;
      }
    }
  }
 
  return true;
}
 
bool PPC::isXXINSERTWMask(ShuffleVectorSDNode *N, unsigned &ShiftElts,
                          unsigned &InsertAtByte, bool &Swap, bool IsLE) {
  if (!isNByteElemShuffleMask(N, 4, 1))
    return false;
 
  // Now we look at mask elements 0,4,8,12
  unsigned M0 = N->getMaskElt(0) / 4;
  unsigned M1 = N->getMaskElt(4) / 4;
  unsigned M2 = N->getMaskElt(8) / 4;
  unsigned M3 = N->getMaskElt(12) / 4;
  unsigned LittleEndianShifts[] = { 2, 1, 0, 3 };
  unsigned BigEndianShifts[] = { 3, 0, 1, 2 };
 
  // Below, let H and L be arbitrary elements of the shuffle mask
  // where H is in the range [4,7] and L is in the range [0,3].
  // H, 1, 2, 3 or L, 5, 6, 7
  if ((M0 > 3 && M1 == 1 && M2 == 2 && M3 == 3) ||
      (M0 < 4 && M1 == 5 && M2 == 6 && M3 == 7)) {
    ShiftElts = IsLE ? LittleEndianShifts[M0 & 0x3] : BigEndianShifts[M0 & 0x3];
    InsertAtByte = IsLE ? 12 : 0;
    Swap = M0 < 4;
    return true;
  }
  // 0, H, 2, 3 or 4, L, 6, 7
  if ((M1 > 3 && M0 == 0 && M2 == 2 && M3 == 3) ||
      (M1 < 4 && M0 == 4 && M2 == 6 && M3 == 7)) {
    ShiftElts = IsLE ? LittleEndianShifts[M1 & 0x3] : BigEndianShifts[M1 & 0x3];
    InsertAtByte = IsLE ? 8 : 4;
    Swap = M1 < 4;
    return true;
  }
  // 0, 1, H, 3 or 4, 5, L, 7
  if ((M2 > 3 && M0 == 0 && M1 == 1 && M3 == 3) ||
      (M2 < 4 && M0 == 4 && M1 == 5 && M3 == 7)) {
    ShiftElts = IsLE ? LittleEndianShifts[M2 & 0x3] : BigEndianShifts[M2 & 0x3];
    InsertAtByte = IsLE ? 4 : 8;
    Swap = M2 < 4;
    return true;
  }
  // 0, 1, 2, H or 4, 5, 6, L
  if ((M3 > 3 && M0 == 0 && M1 == 1 && M2 == 2) ||
      (M3 < 4 && M0 == 4 && M1 == 5 && M2 == 6)) {
    ShiftElts = IsLE ? LittleEndianShifts[M3 & 0x3] : BigEndianShifts[M3 & 0x3];
    InsertAtByte = IsLE ? 0 : 12;
    Swap = M3 < 4;
    return true;
  }
 
  // If both vector operands for the shuffle are the same vector, the mask will
  // contain only elements from the first one and the second one will be undef.
  if (N->getOperand(1).isUndef()) {
    ShiftElts = 0;
    Swap = true;
    unsigned XXINSERTWSrcElem = IsLE ? 2 : 1;
    if (M0 == XXINSERTWSrcElem && M1 == 1 && M2 == 2 && M3 == 3) {
      InsertAtByte = IsLE ? 12 : 0;
      return true;
    }
    if (M0 == 0 && M1 == XXINSERTWSrcElem && M2 == 2 && M3 == 3) {
      InsertAtByte = IsLE ? 8 : 4;
      return true;
    }
    if (M0 == 0 && M1 == 1 && M2 == XXINSERTWSrcElem && M3 == 3) {
      InsertAtByte = IsLE ? 4 : 8;
      return true;
    }
    if (M0 == 0 && M1 == 1 && M2 == 2 && M3 == XXINSERTWSrcElem) {
      InsertAtByte = IsLE ? 0 : 12;
      return true;
    }
  }
 
  return false;
}
 
bool PPC::isXXSLDWIShuffleMask(ShuffleVectorSDNode *N, unsigned &ShiftElts,
                               bool &Swap, bool IsLE) {
  assert(N->getValueType(0) == MVT::v16i8 && "Shuffle vector expects v16i8");
  // Ensure each byte index of the word is consecutive.
  if (!isNByteElemShuffleMask(N, 4, 1))
    return false;
 
  // Now we look at mask elements 0,4,8,12, which are the beginning of words.
  unsigned M0 = N->getMaskElt(0) / 4;
  unsigned M1 = N->getMaskElt(4) / 4;
  unsigned M2 = N->getMaskElt(8) / 4;
  unsigned M3 = N->getMaskElt(12) / 4;
 
  // If both vector operands for the shuffle are the same vector, the mask will
  // contain only elements from the first one and the second one will be undef.
  if (N->getOperand(1).isUndef()) {
    assert(M0 < 4 && "Indexing into an undef vector?");
    if (M1 != (M0 + 1) % 4 || M2 != (M1 + 1) % 4 || M3 != (M2 + 1) % 4)
      return false;
 
    ShiftElts = IsLE ? (4 - M0) % 4 : M0;
    Swap = false;
    return true;
  }
 
  // Ensure each word index of the ShuffleVector Mask is consecutive.
  if (M1 != (M0 + 1) % 8 || M2 != (M1 + 1) % 8 || M3 != (M2 + 1) % 8)
    return false;
 
  if (IsLE) {
    if (M0 == 0 || M0 == 7 || M0 == 6 || M0 == 5) {
      // Input vectors don't need to be swapped if the leading element
      // of the result is one of the 3 left elements of the second vector
      // (or if there is no shift to be done at all).
      Swap = false;
      ShiftElts = (8 - M0) % 8;
    } else if (M0 == 4 || M0 == 3 || M0 == 2 || M0 == 1) {
      // Input vectors need to be swapped if the leading element
      // of the result is one of the 3 left elements of the first vector
      // (or if we're shifting by 4 - thereby simply swapping the vectors).
      Swap = true;
      ShiftElts = (4 - M0) % 4;
    }
 
    return true;
  } else {                                          // BE
    if (M0 == 0 || M0 == 1 || M0 == 2 || M0 == 3) {
      // Input vectors don't need to be swapped if the leading element
      // of the result is one of the 4 elements of the first vector.
      Swap = false;
      ShiftElts = M0;
    } else if (M0 == 4 || M0 == 5 || M0 == 6 || M0 == 7) {
      // Input vectors need to be swapped if the leading element
      // of the result is one of the 4 elements of the right vector.
      Swap = true;
      ShiftElts = M0 - 4;
    }
 
    return true;
  }
}
 
bool static isXXBRShuffleMaskHelper(ShuffleVectorSDNode *N, int Width) {
  assert(N->getValueType(0) == MVT::v16i8 && "Shuffle vector expects v16i8");
 
  if (!isNByteElemShuffleMask(N, Width, -1))
    return false;
 
  for (int i = 0; i < 16; i += Width)
    if (N->getMaskElt(i) != i + Width - 1)
      return false;
 
  return true;
}
 
bool PPC::isXXBRHShuffleMask(ShuffleVectorSDNode *N) {
  return isXXBRShuffleMaskHelper(N, 2);
}
 
bool PPC::isXXBRWShuffleMask(ShuffleVectorSDNode *N) {
  return isXXBRShuffleMaskHelper(N, 4);
}
 
bool PPC::isXXBRDShuffleMask(ShuffleVectorSDNode *N) {
  return isXXBRShuffleMaskHelper(N, 8);
}
 
bool PPC::isXXBRQShuffleMask(ShuffleVectorSDNode *N) {
  return isXXBRShuffleMaskHelper(N, 16);
}
 
/// Can node \p N be lowered to an XXPERMDI instruction? If so, set \p Swap
/// if the inputs to the instruction should be swapped and set \p DM to the
/// value for the immediate.
/// Specifically, set \p Swap to true only if \p N can be lowered to XXPERMDI
/// AND element 0 of the result comes from the first input (LE) or second input
/// (BE). Set \p DM to the calculated result (0-3) only if \p N can be lowered.
/// \return true iff the given mask of shuffle node \p N is a XXPERMDI shuffle
/// mask.
bool PPC::isXXPERMDIShuffleMask(ShuffleVectorSDNode *N, unsigned &DM,
                               bool &Swap, bool IsLE) {
  assert(N->getValueType(0) == MVT::v16i8 && "Shuffle vector expects v16i8");
 
  // Ensure each byte index of the double word is consecutive.
  if (!isNByteElemShuffleMask(N, 8, 1))
    return false;
 
  unsigned M0 = N->getMaskElt(0) / 8;
  unsigned M1 = N->getMaskElt(8) / 8;
  assert(((M0 | M1) < 4) && "A mask element out of bounds?");
 
  // If both vector operands for the shuffle are the same vector, the mask will
  // contain only elements from the first one and the second one will be undef.
  if (N->getOperand(1).isUndef()) {
    if ((M0 | M1) < 2) {
      DM = IsLE ? (((~M1) & 1) << 1) + ((~M0) & 1) : (M0 << 1) + (M1 & 1);
      Swap = false;
      return true;
    } else
      return false;
  }
 
  if (IsLE) {
    if (M0 > 1 && M1 < 2) {
      Swap = false;
    } else if (M0 < 2 && M1 > 1) {
      M0 = (M0 + 2) % 4;
      M1 = (M1 + 2) % 4;
      Swap = true;
    } else
      return false;
 
    // Note: if control flow comes here that means Swap is already set above
    DM = (((~M1) & 1) << 1) + ((~M0) & 1);
    return true;
  } else { // BE
    if (M0 < 2 && M1 > 1) {
      Swap = false;
    } else if (M0 > 1 && M1 < 2) {
      M0 = (M0 + 2) % 4;
      M1 = (M1 + 2) % 4;
      Swap = true;
    } else
      return false;
 
    // Note: if control flow comes here that means Swap is already set above
    DM = (M0 << 1) + (M1 & 1);
    return true;
  }
}
 
 
/// getSplatIdxForPPCMnemonics - Return the splat index as a value that is
/// appropriate for PPC mnemonics (which have a big endian bias - namely
/// elements are counted from the left of the vector register).
unsigned PPC::getSplatIdxForPPCMnemonics(SDNode *N, unsigned EltSize,
                                         SelectionDAG &DAG) {
  ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(N);
  assert(isSplatShuffleMask(SVOp, EltSize));
  EVT VT = SVOp->getValueType(0);
 
  if (VT == MVT::v2i64 || VT == MVT::v2f64)
    return DAG.getDataLayout().isLittleEndian() ? 1 - SVOp->getMaskElt(0)
                                                : SVOp->getMaskElt(0);
 
  if (DAG.getDataLayout().isLittleEndian())
    return (16 / EltSize) - 1 - (SVOp->getMaskElt(0) / EltSize);
  else
    return SVOp->getMaskElt(0) / EltSize;
}
 
/// get_VSPLTI_elt - If this is a build_vector of constants which can be formed
/// by using a vspltis[bhw] instruction of the specified element size, return
/// the constant being splatted.  The ByteSize field indicates the number of
/// bytes of each element [124] -> [bhw].
SDValue PPC::get_VSPLTI_elt(SDNode *N, unsigned ByteSize, SelectionDAG &DAG) {
  SDValue OpVal;
 
  // If ByteSize of the splat is bigger than the element size of the
  // build_vector, then we have a case where we are checking for a splat where
  // multiple elements of the buildvector are folded together into a single
  // logical element of the splat (e.g. "vsplish 1" to splat {0,1}*8).
  unsigned EltSize = 16/N->getNumOperands();
  if (EltSize < ByteSize) {
    unsigned Multiple = ByteSize/EltSize;   // Number of BV entries per spltval.
    SDValue UniquedVals[4];
    assert(Multiple > 1 && Multiple <= 4 && "How can this happen?");
 
    // See if all of the elements in the buildvector agree across.
    for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
      if (N->getOperand(i).isUndef()) continue;
      // If the element isn't a constant, bail fully out.
      if (!isa<ConstantSDNode>(N->getOperand(i))) return SDValue();
 
      if (!UniquedVals[i&(Multiple-1)].getNode())
        UniquedVals[i&(Multiple-1)] = N->getOperand(i);
      else if (UniquedVals[i&(Multiple-1)] != N->getOperand(i))
        return SDValue();  // no match.
    }
 
    // Okay, if we reached this point, UniquedVals[0..Multiple-1] contains
    // either constant or undef values that are identical for each chunk.  See
    // if these chunks can form into a larger vspltis*.
 
    // Check to see if all of the leading entries are either 0 or -1.  If
    // neither, then this won't fit into the immediate field.
    bool LeadingZero = true;
    bool LeadingOnes = true;
    for (unsigned i = 0; i != Multiple-1; ++i) {
      if (!UniquedVals[i].getNode()) continue;  // Must have been undefs.
 
      LeadingZero &= isNullConstant(UniquedVals[i]);
      LeadingOnes &= isAllOnesConstant(UniquedVals[i]);
    }
    // Finally, check the least significant entry.
    if (LeadingZero) {
      if (!UniquedVals[Multiple-1].getNode())
        return DAG.getTargetConstant(0, SDLoc(N), MVT::i32);  // 0,0,0,undef
      int Val = cast<ConstantSDNode>(UniquedVals[Multiple-1])->getZExtValue();
      if (Val < 16)                                   // 0,0,0,4 -> vspltisw(4)
        return DAG.getTargetConstant(Val, SDLoc(N), MVT::i32);
    }
    if (LeadingOnes) {
      if (!UniquedVals[Multiple-1].getNode())
        return DAG.getTargetConstant(~0U, SDLoc(N), MVT::i32); // -1,-1,-1,undef
      int Val =cast<ConstantSDNode>(UniquedVals[Multiple-1])->getSExtValue();
      if (Val >= -16)                            // -1,-1,-1,-2 -> vspltisw(-2)
        return DAG.getTargetConstant(Val, SDLoc(N), MVT::i32);
    }
 
    return SDValue();
  }
 
  // Check to see if this buildvec has a single non-undef value in its elements.
  for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
    if (N->getOperand(i).isUndef()) continue;
    if (!OpVal.getNode())
      OpVal = N->getOperand(i);
    else if (OpVal != N->getOperand(i))
      return SDValue();
  }
 
  if (!OpVal.getNode()) return SDValue();  // All UNDEF: use implicit def.
 
  unsigned ValSizeInBytes = EltSize;
  uint64_t Value = 0;
  if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(OpVal)) {
    Value = CN->getZExtValue();
  } else if (ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(OpVal)) {
    assert(CN->getValueType(0) == MVT::f32 && "Only one legal FP vector type!");
    Value = llvm::bit_cast<uint32_t>(CN->getValueAPF().convertToFloat());
  }
 
  // If the splat value is larger than the element value, then we can never do
  // this splat.  The only case that we could fit the replicated bits into our
  // immediate field for would be zero, and we prefer to use vxor for it.
  if (ValSizeInBytes < ByteSize) return SDValue();
 
  // If the element value is larger than the splat value, check if it consists
  // of a repeated bit pattern of size ByteSize.
  if (!APInt(ValSizeInBytes * 8, Value).isSplat(ByteSize * 8))
    return SDValue();
 
  // Properly sign extend the value.
  int MaskVal = SignExtend32(Value, ByteSize * 8);
 
  // If this is zero, don't match, zero matches ISD::isBuildVectorAllZeros.
  if (MaskVal == 0) return SDValue();
 
  // Finally, if this value fits in a 5 bit sext field, return it
  if (SignExtend32<5>(MaskVal) == MaskVal)
    return DAG.getTargetConstant(MaskVal, SDLoc(N), MVT::i32);
  return SDValue();
}
 
//===----------------------------------------------------------------------===//
//  Addressing Mode Selection
//===----------------------------------------------------------------------===//
 
/// isIntS16Immediate - This method tests to see if the node is either a 32-bit
/// or 64-bit immediate, and if the value can be accurately represented as a
/// sign extension from a 16-bit value.  If so, this returns true and the
/// immediate.
bool llvm::isIntS16Immediate(SDNode *N, int16_t &Imm) {
  if (!isa<ConstantSDNode>(N))
    return false;
 
  Imm = (int16_t)cast<ConstantSDNode>(N)->getZExtValue();
  if (N->getValueType(0) == MVT::i32)
    return Imm == (int32_t)cast<ConstantSDNode>(N)->getZExtValue();
  else
    return Imm == (int64_t)cast<ConstantSDNode>(N)->getZExtValue();
}
bool llvm::isIntS16Immediate(SDValue Op, int16_t &Imm) {
  return isIntS16Immediate(Op.getNode(), Imm);
}
 
/// Used when computing address flags for selecting loads and stores.
/// If we have an OR, check if the LHS and RHS are provably disjoint.
/// An OR of two provably disjoint values is equivalent to an ADD.
/// Most PPC load/store instructions compute the effective address as a sum,
/// so doing this conversion is useful.
static bool provablyDisjointOr(SelectionDAG &DAG, const SDValue &N) {
  if (N.getOpcode() != ISD::OR)
    return false;
  KnownBits LHSKnown = DAG.computeKnownBits(N.getOperand(0));
  if (!LHSKnown.Zero.getBoolValue())
    return false;
  KnownBits RHSKnown = DAG.computeKnownBits(N.getOperand(1));
  return (~(LHSKnown.Zero | RHSKnown.Zero) == 0);
}
 
/// SelectAddressEVXRegReg - Given the specified address, check to see if it can
/// be represented as an indexed [r+r] operation.
bool PPCTargetLowering::SelectAddressEVXRegReg(SDValue N, SDValue &Base,
                                               SDValue &Index,
                                               SelectionDAG &DAG) const {
  for (SDNode *U : N->uses()) {
    if (MemSDNode *Memop = dyn_cast<MemSDNode>(U)) {
      if (Memop->getMemoryVT() == MVT::f64) {
          Base = N.getOperand(0);
          Index = N.getOperand(1);
          return true;
      }
    }
  }
  return false;
}
 
/// isIntS34Immediate - This method tests if value of node given can be
/// accurately represented as a sign extension from a 34-bit value.  If so,
/// this returns true and the immediate.
bool llvm::isIntS34Immediate(SDNode *N, int64_t &Imm) {
  if (!isa<ConstantSDNode>(N))
    return false;
 
  Imm = (int64_t)cast<ConstantSDNode>(N)->getZExtValue();
  return isInt<34>(Imm);
}
bool llvm::isIntS34Immediate(SDValue Op, int64_t &Imm) {
  return isIntS34Immediate(Op.getNode(), Imm);
}
 
/// SelectAddressRegReg - Given the specified addressed, check to see if it
/// can be represented as an indexed [r+r] operation.  Returns false if it
/// can be more efficiently represented as [r+imm]. If \p EncodingAlignment is
/// non-zero and N can be represented by a base register plus a signed 16-bit
/// displacement, make a more precise judgement by checking (displacement % \p
/// EncodingAlignment).
bool PPCTargetLowering::SelectAddressRegReg(
    SDValue N, SDValue &Base, SDValue &Index, SelectionDAG &DAG,
    MaybeAlign EncodingAlignment) const {
  // If we have a PC Relative target flag don't select as [reg+reg]. It will be
  // a [pc+imm].
  if (SelectAddressPCRel(N, Base))
    return false;
 
  int16_t Imm = 0;
  if (N.getOpcode() == ISD::ADD) {
    // Is there any SPE load/store (f64), which can't handle 16bit offset?
    // SPE load/store can only handle 8-bit offsets.
    if (hasSPE() && SelectAddressEVXRegReg(N, Base, Index, DAG))
        return true;
    if (isIntS16Immediate(N.getOperand(1), Imm) &&
        (!EncodingAlignment || isAligned(*EncodingAlignment, Imm)))
      return false; // r+i
    if (N.getOperand(1).getOpcode() == PPCISD::Lo)
      return false;    // r+i
 
    Base = N.getOperand(0);
    Index = N.getOperand(1);
    return true;
  } else if (N.getOpcode() == ISD::OR) {
    if (isIntS16Immediate(N.getOperand(1), Imm) &&
        (!EncodingAlignment || isAligned(*EncodingAlignment, Imm)))
      return false; // r+i can fold it if we can.
 
    // If this is an or of disjoint bitfields, we can codegen this as an add
    // (for better address arithmetic) if the LHS and RHS of the OR are provably
    // disjoint.
    KnownBits LHSKnown = DAG.computeKnownBits(N.getOperand(0));
 
    if (LHSKnown.Zero.getBoolValue()) {
      KnownBits RHSKnown = DAG.computeKnownBits(N.getOperand(1));
      // If all of the bits are known zero on the LHS or RHS, the add won't
      // carry.
      if (~(LHSKnown.Zero | RHSKnown.Zero) == 0) {
        Base = N.getOperand(0);
        Index = N.getOperand(1);
        return true;
      }
    }
  }
 
  return false;
}
 
// If we happen to be doing an i64 load or store into a stack slot that has
// less than a 4-byte alignment, then the frame-index elimination may need to
// use an indexed load or store instruction (because the offset may not be a
// multiple of 4). The extra register needed to hold the offset comes from the
// register scavenger, and it is possible that the scavenger will need to use
// an emergency spill slot. As a result, we need to make sure that a spill slot
// is allocated when doing an i64 load/store into a less-than-4-byte-aligned
// stack slot.
static void fixupFuncForFI(SelectionDAG &DAG, int FrameIdx, EVT VT) {
  // FIXME: This does not handle the LWA case.
  if (VT != MVT::i64)
    return;
 
  // NOTE: We'll exclude negative FIs here, which come from argument
  // lowering, because there are no known test cases triggering this problem
  // using packed structures (or similar). We can remove this exclusion if
  // we find such a test case. The reason why this is so test-case driven is
  // because this entire 'fixup' is only to prevent crashes (from the
  // register scavenger) on not-really-valid inputs. For example, if we have:
  //   %a = alloca i1
  //   %b = bitcast i1* %a to i64*
  //   store i64* a, i64 b
  // then the store should really be marked as 'align 1', but is not. If it
  // were marked as 'align 1' then the indexed form would have been
  // instruction-selected initially, and the problem this 'fixup' is preventing
  // won't happen regardless.
  if (FrameIdx < 0)
    return;
 
  MachineFunction &MF = DAG.getMachineFunction();
  MachineFrameInfo &MFI = MF.getFrameInfo();
 
  if (MFI.getObjectAlign(FrameIdx) >= Align(4))
    return;
 
  PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
  FuncInfo->setHasNonRISpills();
}
 
/// Returns true if the address N can be represented by a base register plus
/// a signed 16-bit displacement [r+imm], and if it is not better
/// represented as reg+reg.  If \p EncodingAlignment is non-zero, only accept
/// displacements that are multiples of that value.
bool PPCTargetLowering::SelectAddressRegImm(
    SDValue N, SDValue &Disp, SDValue &Base, SelectionDAG &DAG,
    MaybeAlign EncodingAlignment) const {
  // FIXME dl should come from parent load or store, not from address
  SDLoc dl(N);
 
  // If we have a PC Relative target flag don't select as [reg+imm]. It will be
  // a [pc+imm].
  if (SelectAddressPCRel(N, Base))
    return false;
 
  // If this can be more profitably realized as r+r, fail.
  if (SelectAddressRegReg(N, Disp, Base, DAG, EncodingAlignment))
    return false;
 
  if (N.getOpcode() == ISD::ADD) {
    int16_t imm = 0;
    if (isIntS16Immediate(N.getOperand(1), imm) &&
        (!EncodingAlignment || isAligned(*EncodingAlignment, imm))) {
      Disp = DAG.getTargetConstant(imm, dl, N.getValueType());
      if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N.getOperand(0))) {
        Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
        fixupFuncForFI(DAG, FI->getIndex(), N.getValueType());
      } else {
        Base = N.getOperand(0);
      }
      return true; // [r+i]
    } else if (N.getOperand(1).getOpcode() == PPCISD::Lo) {
      // Match LOAD (ADD (X, Lo(G))).
      assert(!cast<ConstantSDNode>(N.getOperand(1).getOperand(1))->getZExtValue()
             && "Cannot handle constant offsets yet!");
      Disp = N.getOperand(1).getOperand(0);  // The global address.
      assert(Disp.getOpcode() == ISD::TargetGlobalAddress ||
             Disp.getOpcode() == ISD::TargetGlobalTLSAddress ||
             Disp.getOpcode() == ISD::TargetConstantPool ||
             Disp.getOpcode() == ISD::TargetJumpTable);
      Base = N.getOperand(0);
      return true;  // [&g+r]
    }
  } else if (N.getOpcode() == ISD::OR) {
    int16_t imm = 0;
    if (isIntS16Immediate(N.getOperand(1), imm) &&
        (!EncodingAlignment || isAligned(*EncodingAlignment, imm))) {
      // If this is an or of disjoint bitfields, we can codegen this as an add
      // (for better address arithmetic) if the LHS and RHS of the OR are
      // provably disjoint.
      KnownBits LHSKnown = DAG.computeKnownBits(N.getOperand(0));
 
      if ((LHSKnown.Zero.getZExtValue()|~(uint64_t)imm) == ~0ULL) {
        // If all of the bits are known zero on the LHS or RHS, the add won't
        // carry.
        if (FrameIndexSDNode *FI =
              dyn_cast<FrameIndexSDNode>(N.getOperand(0))) {
          Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
          fixupFuncForFI(DAG, FI->getIndex(), N.getValueType());
        } else {
          Base = N.getOperand(0);
        }
        Disp = DAG.getTargetConstant(imm, dl, N.getValueType());
        return true;
      }
    }
  } else if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N)) {
    // Loading from a constant address.
 
    // If this address fits entirely in a 16-bit sext immediate field, codegen
    // this as "d, 0"
    int16_t Imm;
    if (isIntS16Immediate(CN, Imm) &&
        (!EncodingAlignment || isAligned(*EncodingAlignment, Imm))) {
      Disp = DAG.getTargetConstant(Imm, dl, CN->getValueType(0));
      Base = DAG.getRegister(Subtarget.isPPC64() ? PPC::ZERO8 : PPC::ZERO,
                             CN->getValueType(0));
      return true;
    }
 
    // Handle 32-bit sext immediates with LIS + addr mode.
    if ((CN->getValueType(0) == MVT::i32 ||
         (int64_t)CN->getZExtValue() == (int)CN->getZExtValue()) &&
        (!EncodingAlignment ||
         isAligned(*EncodingAlignment, CN->getZExtValue()))) {
      int Addr = (int)CN->getZExtValue();
 
      // Otherwise, break this down into an LIS + disp.
      Disp = DAG.getTargetConstant((short)Addr, dl, MVT::i32);
 
      Base = DAG.getTargetConstant((Addr - (signed short)Addr) >> 16, dl,
                                   MVT::i32);
      unsigned Opc = CN->getValueType(0) == MVT::i32 ? PPC::LIS : PPC::LIS8;
      Base = SDValue(DAG.getMachineNode(Opc, dl, CN->getValueType(0), Base), 0);
      return true;
    }
  }
 
  Disp = DAG.getTargetConstant(0, dl, getPointerTy(DAG.getDataLayout()));
  if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N)) {
    Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
    fixupFuncForFI(DAG, FI->getIndex(), N.getValueType());
  } else
    Base = N;
  return true;      // [r+0]
}
 
/// Similar to the 16-bit case but for instructions that take a 34-bit
/// displacement field (prefixed loads/stores).
bool PPCTargetLowering::SelectAddressRegImm34(SDValue N, SDValue &Disp,
                                              SDValue &Base,
                                              SelectionDAG &DAG) const {
  // Only on 64-bit targets.
  if (N.getValueType() != MVT::i64)
    return false;
 
  SDLoc dl(N);
  int64_t Imm = 0;
 
  if (N.getOpcode() == ISD::ADD) {
    if (!isIntS34Immediate(N.getOperand(1), Imm))
      return false;
    Disp = DAG.getTargetConstant(Imm, dl, N.getValueType());
    if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N.getOperand(0)))
      Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
    else
      Base = N.getOperand(0);
    return true;
  }
 
  if (N.getOpcode() == ISD::OR) {
    if (!isIntS34Immediate(N.getOperand(1), Imm))
      return false;
    // If this is an or of disjoint bitfields, we can codegen this as an add
    // (for better address arithmetic) if the LHS and RHS of the OR are
    // provably disjoint.
    KnownBits LHSKnown = DAG.computeKnownBits(N.getOperand(0));
    if ((LHSKnown.Zero.getZExtValue() | ~(uint64_t)Imm) != ~0ULL)
      return false;
    if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N.getOperand(0)))
      Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
    else
      Base = N.getOperand(0);
    Disp = DAG.getTargetConstant(Imm, dl, N.getValueType());
    return true;
  }
 
  if (isIntS34Immediate(N, Imm)) { // If the address is a 34-bit const.
    Disp = DAG.getTargetConstant(Imm, dl, N.getValueType());
    Base = DAG.getRegister(PPC::ZERO8, N.getValueType());
    return true;
  }
 
  return false;
}
 
/// SelectAddressRegRegOnly - Given the specified addressed, force it to be
/// represented as an indexed [r+r] operation.
bool PPCTargetLowering::SelectAddressRegRegOnly(SDValue N, SDValue &Base,
                                                SDValue &Index,
                                                SelectionDAG &DAG) const {
  // Check to see if we can easily represent this as an [r+r] address.  This
  // will fail if it thinks that the address is more profitably represented as
  // reg+imm, e.g. where imm = 0.
  if (SelectAddressRegReg(N, Base, Index, DAG))
    return true;
 
  // If the address is the result of an add, we will utilize the fact that the
  // address calculation includes an implicit add.  However, we can reduce
  // register pressure if we do not materialize a constant just for use as the
  // index register.  We only get rid of the add if it is not an add of a
  // value and a 16-bit signed constant and both have a single use.
  int16_t imm = 0;
  if (N.getOpcode() == ISD::ADD &&
      (!isIntS16Immediate(N.getOperand(1), imm) ||
       !N.getOperand(1).hasOneUse() || !N.getOperand(0).hasOneUse())) {
    Base = N.getOperand(0);
    Index = N.getOperand(1);
    return true;
  }
 
  // Otherwise, do it the hard way, using R0 as the base register.
  Base = DAG.getRegister(Subtarget.isPPC64() ? PPC::ZERO8 : PPC::ZERO,
                         N.getValueType());
  Index = N;
  return true;
}
 
template <typename Ty> static bool isValidPCRelNode(SDValue N) {
  Ty *PCRelCand = dyn_cast<Ty>(N);
  return PCRelCand && (PCRelCand->getTargetFlags() & PPCII::MO_PCREL_FLAG);
}
 
/// Returns true if this address is a PC Relative address.
/// PC Relative addresses are marked with the flag PPCII::MO_PCREL_FLAG
/// or if the node opcode is PPCISD::MAT_PCREL_ADDR.
bool PPCTargetLowering::SelectAddressPCRel(SDValue N, SDValue &Base) const {
  // This is a materialize PC Relative node. Always select this as PC Relative.
  Base = N;
  if (N.getOpcode() == PPCISD::MAT_PCREL_ADDR)
    return true;
  if (isValidPCRelNode<ConstantPoolSDNode>(N) ||
      isValidPCRelNode<GlobalAddressSDNode>(N) ||
      isValidPCRelNode<JumpTableSDNode>(N) ||
      isValidPCRelNode<BlockAddressSDNode>(N))
    return true;
  return false;
}
 
/// Returns true if we should use a direct load into vector instruction
/// (such as lxsd or lfd), instead of a load into gpr + direct move sequence.
static bool usePartialVectorLoads(SDNode *N, const PPCSubtarget& ST) {
 
  // If there are any other uses other than scalar to vector, then we should
  // keep it as a scalar load -> direct move pattern to prevent multiple
  // loads.
  LoadSDNode *LD = dyn_cast<LoadSDNode>(N);
  if (!LD)
    return false;
 
  EVT MemVT = LD->getMemoryVT();
  if (!MemVT.isSimple())
    return false;
  switch(MemVT.getSimpleVT().SimpleTy) {
  case MVT::i64:
    break;
  case MVT::i32:
    if (!ST.hasP8Vector())
      return false;
    break;
  case MVT::i16:
  case MVT::i8:
    if (!ST.hasP9Vector())
      return false;
    break;
  default:
    return false;
  }
 
  SDValue LoadedVal(N, 0);
  if (!LoadedVal.hasOneUse())
    return false;
 
  for (SDNode::use_iterator UI = LD->use_begin(), UE = LD->use_end();
       UI != UE; ++UI)
    if (UI.getUse().get().getResNo() == 0 &&
        UI->getOpcode() != ISD::SCALAR_TO_VECTOR &&
        UI->getOpcode() != PPCISD::SCALAR_TO_VECTOR_PERMUTED)
      return false;
 
  return true;
}
 
/// getPreIndexedAddressParts - returns true by value, base pointer and
/// offset pointer and addressing mode by reference if the node's address
/// can be legally represented as pre-indexed load / store address.
bool PPCTargetLowering::getPreIndexedAddressParts(SDNode *N, SDValue &Base,
                                                  SDValue &Offset,
                                                  ISD::MemIndexedMode &AM,
                                                  SelectionDAG &DAG) const {
  if (DisablePPCPreinc) return false;
 
  bool isLoad = true;
  SDValue Ptr;
  EVT VT;
  Align Alignment;
  if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
    Ptr = LD->getBasePtr();
    VT = LD->getMemoryVT();
    Alignment = LD->getAlign();
  } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
    Ptr = ST->getBasePtr();
    VT  = ST->getMemoryVT();
    Alignment = ST->getAlign();
    isLoad = false;
  } else
    return false;
 
  // Do not generate pre-inc forms for specific loads that feed scalar_to_vector
  // instructions because we can fold these into a more efficient instruction
  // instead, (such as LXSD).
  if (isLoad && usePartialVectorLoads(N, Subtarget)) {
    return false;
  }
 
  // PowerPC doesn't have preinc load/store instructions for vectors
  if (VT.isVector())
    return false;
 
  if (SelectAddressRegReg(Ptr, Base, Offset, DAG)) {
    // Common code will reject creating a pre-inc form if the base pointer
    // is a frame index, or if N is a store and the base pointer is either
    // the same as or a predecessor of the value being stored.  Check for
    // those situations here, and try with swapped Base/Offset instead.
    bool Swap = false;
 
    if (isa<FrameIndexSDNode>(Base) || isa<RegisterSDNode>(Base))
      Swap = true;
    else if (!isLoad) {
      SDValue Val = cast<StoreSDNode>(N)->getValue();
      if (Val == Base || Base.getNode()->isPredecessorOf(Val.getNode()))
        Swap = true;
    }
 
    if (Swap)
      std::swap(Base, Offset);
 
    AM = ISD::PRE_INC;
    return true;
  }
 
  // LDU/STU can only handle immediates that are a multiple of 4.
  if (VT != MVT::i64) {
    if (!SelectAddressRegImm(Ptr, Offset, Base, DAG, std::nullopt))
      return false;
  } else {
    // LDU/STU need an address with at least 4-byte alignment.
    if (Alignment < Align(4))
      return false;
 
    if (!SelectAddressRegImm(Ptr, Offset, Base, DAG, Align(4)))
      return false;
  }
 
  if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
    // PPC64 doesn't have lwau, but it does have lwaux.  Reject preinc load of
    // sext i32 to i64 when addr mode is r+i.
    if (LD->getValueType(0) == MVT::i64 && LD->getMemoryVT() == MVT::i32 &&
        LD->getExtensionType() == ISD::SEXTLOAD &&
        isa<ConstantSDNode>(Offset))
      return false;
  }
 
  AM = ISD::PRE_INC;
  return true;
}
 
//===----------------------------------------------------------------------===//
//  LowerOperation implementation
//===----------------------------------------------------------------------===//
 
/// Return true if we should reference labels using a PICBase, set the HiOpFlags
/// and LoOpFlags to the target MO flags.
static void getLabelAccessInfo(bool IsPIC, const PPCSubtarget &Subtarget,
                               unsigned &HiOpFlags, unsigned &LoOpFlags,
                               const GlobalValue *GV = nullptr) {
  HiOpFlags = PPCII::MO_HA;
  LoOpFlags = PPCII::MO_LO;
 
  // Don't use the pic base if not in PIC relocation model.
  if (IsPIC) {
    HiOpFlags |= PPCII::MO_PIC_FLAG;
    LoOpFlags |= PPCII::MO_PIC_FLAG;
  }
}
 
static SDValue LowerLabelRef(SDValue HiPart, SDValue LoPart, bool isPIC,
                             SelectionDAG &DAG) {
  SDLoc DL(HiPart);
  EVT PtrVT = HiPart.getValueType();
  SDValue Zero = DAG.getConstant(0, DL, PtrVT);
 
  SDValue Hi = DAG.getNode(PPCISD::Hi, DL, PtrVT, HiPart, Zero);
  SDValue Lo = DAG.getNode(PPCISD::Lo, DL, PtrVT, LoPart, Zero);
 
  // With PIC, the first instruction is actually "GR+hi(&G)".
  if (isPIC)
    Hi = DAG.getNode(ISD::ADD, DL, PtrVT,
                     DAG.getNode(PPCISD::GlobalBaseReg, DL, PtrVT), Hi);
 
  // Generate non-pic code that has direct accesses to the constant pool.
  // The address of the global is just (hi(&g)+lo(&g)).
  return DAG.getNode(ISD::ADD, DL, PtrVT, Hi, Lo);
}
 
static void setUsesTOCBasePtr(MachineFunction &MF) {
  PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
  FuncInfo->setUsesTOCBasePtr();
}
 
static void setUsesTOCBasePtr(SelectionDAG &DAG) {
  setUsesTOCBasePtr(DAG.getMachineFunction());
}
 
SDValue PPCTargetLowering::getTOCEntry(SelectionDAG &DAG, const SDLoc &dl,
                                       SDValue GA) const {
  const bool Is64Bit = Subtarget.isPPC64();
  EVT VT = Is64Bit ? MVT::i64 : MVT::i32;
  SDValue Reg = Is64Bit ? DAG.getRegister(PPC::X2, VT)
                        : Subtarget.isAIXABI()
                              ? DAG.getRegister(PPC::R2, VT)
                              : DAG.getNode(PPCISD::GlobalBaseReg, dl, VT);
  SDValue Ops[] = { GA, Reg };
  return DAG.getMemIntrinsicNode(
      PPCISD::TOC_ENTRY, dl, DAG.getVTList(VT, MVT::Other), Ops, VT,
      MachinePointerInfo::getGOT(DAG.getMachineFunction()), std::nullopt,
      MachineMemOperand::MOLoad);
}
 
SDValue PPCTargetLowering::LowerConstantPool(SDValue Op,
                                             SelectionDAG &DAG) const {
  EVT PtrVT = Op.getValueType();
  ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
  const Constant *C = CP->getConstVal();
 
  // 64-bit SVR4 ABI and AIX ABI code are always position-independent.
  // The actual address of the GlobalValue is stored in the TOC.
  if (Subtarget.is64BitELFABI() || Subtarget.isAIXABI()) {
    if (Subtarget.isUsingPCRelativeCalls()) {
      SDLoc DL(CP);
      EVT Ty = getPointerTy(DAG.getDataLayout());
      SDValue ConstPool = DAG.getTargetConstantPool(
          C, Ty, CP->getAlign(), CP->getOffset(), PPCII::MO_PCREL_FLAG);
      return DAG.getNode(PPCISD::MAT_PCREL_ADDR, DL, Ty, ConstPool);
    }
    setUsesTOCBasePtr(DAG);
    SDValue GA = DAG.getTargetConstantPool(C, PtrVT, CP->getAlign(), 0);
    return getTOCEntry(DAG, SDLoc(CP), GA);
  }
 
  unsigned MOHiFlag, MOLoFlag;
  bool IsPIC = isPositionIndependent();
  getLabelAccessInfo(IsPIC, Subtarget, MOHiFlag, MOLoFlag);
 
  if (IsPIC && Subtarget.isSVR4ABI()) {
    SDValue GA =
        DAG.getTargetConstantPool(C, PtrVT, CP->getAlign(), PPCII::MO_PIC_FLAG);
    return getTOCEntry(DAG, SDLoc(CP), GA);
  }
 
  SDValue CPIHi =
      DAG.getTargetConstantPool(C, PtrVT, CP->getAlign(), 0, MOHiFlag);
  SDValue CPILo =
      DAG.getTargetConstantPool(C, PtrVT, CP->getAlign(), 0, MOLoFlag);
  return LowerLabelRef(CPIHi, CPILo, IsPIC, DAG);
}
 
// For 64-bit PowerPC, prefer the more compact relative encodings.
// This trades 32 bits per jump table entry for one or two instructions
// on the jump site.
unsigned PPCTargetLowering::getJumpTableEncoding() const {
  if (isJumpTableRelative())
    return MachineJumpTableInfo::EK_LabelDifference32;
 
  return TargetLowering::getJumpTableEncoding();
}
 
bool PPCTargetLowering::isJumpTableRelative() const {
  if (UseAbsoluteJumpTables)
    return false;
  if (Subtarget.isPPC64() || Subtarget.isAIXABI())
    return true;
  return TargetLowering::isJumpTableRelative();
}
 
SDValue PPCTargetLowering::getPICJumpTableRelocBase(SDValue Table,
                                                    SelectionDAG &DAG) const {
  if (!Subtarget.isPPC64() || Subtarget.isAIXABI())
    return TargetLowering::getPICJumpTableRelocBase(Table, DAG);
 
  switch (getTargetMachine().getCodeModel()) {
  case CodeModel::Small:
  case CodeModel::Medium:
    return TargetLowering::getPICJumpTableRelocBase(Table, DAG);
  default:
    return DAG.getNode(PPCISD::GlobalBaseReg, SDLoc(),
                       getPointerTy(DAG.getDataLayout()));
  }
}
 
const MCExpr *
PPCTargetLowering::getPICJumpTableRelocBaseExpr(const MachineFunction *MF,
                                                unsigned JTI,
                                                MCContext &Ctx) const {
  if (!Subtarget.isPPC64() || Subtarget.isAIXABI())
    return TargetLowering::getPICJumpTableRelocBaseExpr(MF, JTI, Ctx);
 
  switch (getTargetMachine().getCodeModel()) {
  case CodeModel::Small:
  case CodeModel::Medium:
    return TargetLowering::getPICJumpTableRelocBaseExpr(MF, JTI, Ctx);
  default:
    return MCSymbolRefExpr::create(MF->getPICBaseSymbol(), Ctx);
  }
}
 
SDValue PPCTargetLowering::LowerJumpTable(SDValue Op, SelectionDAG &DAG) const {
  EVT PtrVT = Op.getValueType();
  JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
 
  // isUsingPCRelativeCalls() returns true when PCRelative is enabled
  if (Subtarget.isUsingPCRelativeCalls()) {
    SDLoc DL(JT);
    EVT Ty = getPointerTy(DAG.getDataLayout());
    SDValue GA =
        DAG.getTargetJumpTable(JT->getIndex(), Ty, PPCII::MO_PCREL_FLAG);
    SDValue MatAddr = DAG.getNode(PPCISD::MAT_PCREL_ADDR, DL, Ty, GA);
    return MatAddr;
  }
 
  // 64-bit SVR4 ABI and AIX ABI code are always position-independent.
  // The actual address of the GlobalValue is stored in the TOC.
  if (Subtarget.is64BitELFABI() || Subtarget.isAIXABI()) {
    setUsesTOCBasePtr(DAG);
    SDValue GA = DAG.getTargetJumpTable(JT->getIndex(), PtrVT);
    return getTOCEntry(DAG, SDLoc(JT), GA);
  }
 
  unsigned MOHiFlag, MOLoFlag;
  bool IsPIC = isPositionIndependent();
  getLabelAccessInfo(IsPIC, Subtarget, MOHiFlag, MOLoFlag);
 
  if (IsPIC && Subtarget.isSVR4ABI()) {
    SDValue GA = DAG.getTargetJumpTable(JT->getIndex(), PtrVT,
                                        PPCII::MO_PIC_FLAG);
    return getTOCEntry(DAG, SDLoc(GA), GA);
  }
 
  SDValue JTIHi = DAG.getTargetJumpTable(JT->getIndex(), PtrVT, MOHiFlag);
  SDValue JTILo = DAG.getTargetJumpTable(JT->getIndex(), PtrVT, MOLoFlag);
  return LowerLabelRef(JTIHi, JTILo, IsPIC, DAG);
}
 
SDValue PPCTargetLowering::LowerBlockAddress(SDValue Op,
                                             SelectionDAG &DAG) const {
  EVT PtrVT = Op.getValueType();
  BlockAddressSDNode *BASDN = cast<BlockAddressSDNode>(Op);
  const BlockAddress *BA = BASDN->getBlockAddress();
 
  // isUsingPCRelativeCalls() returns true when PCRelative is enabled
  if (Subtarget.isUsingPCRelativeCalls()) {
    SDLoc DL(BASDN);
    EVT Ty = getPointerTy(DAG.getDataLayout());
    SDValue GA = DAG.getTargetBlockAddress(BA, Ty, BASDN->getOffset(),
                                           PPCII::MO_PCREL_FLAG);
    SDValue MatAddr = DAG.getNode(PPCISD::MAT_PCREL_ADDR, DL, Ty, GA);
    return MatAddr;
  }
 
  // 64-bit SVR4 ABI and AIX ABI code are always position-independent.
  // The actual BlockAddress is stored in the TOC.
  if (Subtarget.is64BitELFABI() || Subtarget.isAIXABI()) {
    setUsesTOCBasePtr(DAG);
    SDValue GA = DAG.getTargetBlockAddress(BA, PtrVT, BASDN->getOffset());
    return getTOCEntry(DAG, SDLoc(BASDN), GA);
  }
 
  // 32-bit position-independent ELF stores the BlockAddress in the .got.
  if (Subtarget.is32BitELFABI() && isPositionIndependent())
    return getTOCEntry(
        DAG, SDLoc(BASDN),
        DAG.getTargetBlockAddress(BA, PtrVT, BASDN->getOffset()));
 
  unsigned MOHiFlag, MOLoFlag;
  bool IsPIC = isPositionIndependent();
  getLabelAccessInfo(IsPIC, Subtarget, MOHiFlag, MOLoFlag);
  SDValue TgtBAHi = DAG.getTargetBlockAddress(BA, PtrVT, 0, MOHiFlag);
  SDValue TgtBALo = DAG.getTargetBlockAddress(BA, PtrVT, 0, MOLoFlag);
  return LowerLabelRef(TgtBAHi, TgtBALo, IsPIC, DAG);
}
 
SDValue PPCTargetLowering::LowerGlobalTLSAddress(SDValue Op,
                                              SelectionDAG &DAG) const {
  if (Subtarget.isAIXABI())
    return LowerGlobalTLSAddressAIX(Op, DAG);
 
  return LowerGlobalTLSAddressLinux(Op, DAG);
}
 
SDValue PPCTargetLowering::LowerGlobalTLSAddressAIX(SDValue Op,
                                                    SelectionDAG &DAG) const {
  GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(Op);
 
  if (DAG.getTarget().useEmulatedTLS())
    report_fatal_error("Emulated TLS is not yet supported on AIX");
 
  SDLoc dl(GA);
  const GlobalValue *GV = GA->getGlobal();
  EVT PtrVT = getPointerTy(DAG.getDataLayout());
  bool Is64Bit = Subtarget.isPPC64();
  bool HasAIXSmallLocalExecTLS = Subtarget.hasAIXSmallLocalExecTLS();
  TLSModel::Model Model = getTargetMachine().getTLSModel(GV);
  bool IsTLSLocalExecModel = Model == TLSModel::LocalExec;
 
  if (IsTLSLocalExecModel || Model == TLSModel::InitialExec) {
    SDValue VariableOffsetTGA =
        DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0, PPCII::MO_TPREL_FLAG);
    SDValue VariableOffset = getTOCEntry(DAG, dl, VariableOffsetTGA);
    SDValue TLSReg;
    if (Is64Bit) {
      // For local-exec and initial-exec on AIX (64-bit), the sequence generated
      // involves a load of the variable offset (from the TOC), followed by an
      // add of the loaded variable offset to R13 (the thread pointer).
      // This code sequence looks like:
      //    ld reg1,var[TC](2)
      //    add reg2, reg1, r13     // r13 contains the thread pointer
      TLSReg = DAG.getRegister(PPC::X13, MVT::i64);
 
      // With the -maix-small-local-exec-tls option, produce a faster access
      // sequence for local-exec TLS variables where the offset from the TLS
      // base is encoded as an immediate operand.
      //
      // We only utilize the faster local-exec access sequence when the TLS
      // variable has a size within the policy limit. We treat types that are
      // not sized or are empty as being over the policy size limit.
      if (HasAIXSmallLocalExecTLS && IsTLSLocalExecModel) {
        Type *GVType = GV->getValueType();
        if (GVType->isSized() && !GVType->isEmptyTy() &&
            GV->getParent()->getDataLayout().getTypeAllocSize(GVType) <=
                AIXSmallTlsPolicySizeLimit)
          return DAG.getNode(PPCISD::Lo, dl, PtrVT, VariableOffsetTGA, TLSReg);
      }
    } else {
      // For local-exec and initial-exec on AIX (32-bit), the sequence generated
      // involves loading the variable offset from the TOC, generating a call to
      // .__get_tpointer to get the thread pointer (which will be in R3), and
      // adding the two together:
      //    lwz reg1,var[TC](2)
      //    bla .__get_tpointer
      //    add reg2, reg1, r3
      TLSReg = DAG.getNode(PPCISD::GET_TPOINTER, dl, PtrVT);
 
      // We do not implement the 32-bit version of the faster access sequence
      // for local-exec that is controlled by -maix-small-local-exec-tls.
      if (HasAIXSmallLocalExecTLS)
        report_fatal_error("The small-local-exec TLS access sequence is "
                           "currently only supported on AIX (64-bit mode).");
    }
    return DAG.getNode(PPCISD::ADD_TLS, dl, PtrVT, TLSReg, VariableOffset);
  }
 
  // Only Local-Exec, Initial-Exec and General-Dynamic TLS models are currently
  // supported models. If Local- or Initial-exec are not possible or specified,
  // all GlobalTLSAddress nodes are lowered using the general-dynamic model.
  // We need to generate two TOC entries, one for the variable offset, one for
  // the region handle. The global address for the TOC entry of the region
  // handle is created with the MO_TLSGDM_FLAG flag and the global address
  // for the TOC entry of the variable offset is created with MO_TLSGD_FLAG.
  SDValue VariableOffsetTGA =
      DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0, PPCII::MO_TLSGD_FLAG);
  SDValue RegionHandleTGA =
      DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0, PPCII::MO_TLSGDM_FLAG);
  SDValue VariableOffset = getTOCEntry(DAG, dl, VariableOffsetTGA);
  SDValue RegionHandle = getTOCEntry(DAG, dl, RegionHandleTGA);
  return DAG.getNode(PPCISD::TLSGD_AIX, dl, PtrVT, VariableOffset,
                     RegionHandle);
}
 
SDValue PPCTargetLowering::LowerGlobalTLSAddressLinux(SDValue Op,
                                                      SelectionDAG &DAG) const {
  // FIXME: TLS addresses currently use medium model code sequences,
  // which is the most useful form.  Eventually support for small and
  // large models could be added if users need it, at the cost of
  // additional complexity.
  GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(Op);
  if (DAG.getTarget().useEmulatedTLS())
    return LowerToTLSEmulatedModel(GA, DAG);
 
  SDLoc dl(GA);
  const GlobalValue *GV = GA->getGlobal();
  EVT PtrVT = getPointerTy(DAG.getDataLayout());
  bool is64bit = Subtarget.isPPC64();
  const Module *M = DAG.getMachineFunction().getFunction().getParent();
  PICLevel::Level picLevel = M->getPICLevel();
 
  const TargetMachine &TM = getTargetMachine();
  TLSModel::Model Model = TM.getTLSModel(GV);
 
  if (Model == TLSModel::LocalExec) {
    if (Subtarget.isUsingPCRelativeCalls()) {
      SDValue TLSReg = DAG.getRegister(PPC::X13, MVT::i64);
      SDValue TGA = DAG.getTargetGlobalAddress(
          GV, dl, PtrVT, 0, (PPCII::MO_PCREL_FLAG | PPCII::MO_TPREL_FLAG));
      SDValue MatAddr =
          DAG.getNode(PPCISD::TLS_LOCAL_EXEC_MAT_ADDR, dl, PtrVT, TGA);
      return DAG.getNode(PPCISD::ADD_TLS, dl, PtrVT, TLSReg, MatAddr);
    }
 
    SDValue TGAHi = DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0,
                                               PPCII::MO_TPREL_HA);
    SDValue TGALo = DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0,
                                               PPCII::MO_TPREL_LO);
    SDValue TLSReg = is64bit ? DAG.getRegister(PPC::X13, MVT::i64)
                             : DAG.getRegister(PPC::R2, MVT::i32);
 
    SDValue Hi = DAG.getNode(PPCISD::Hi, dl, PtrVT, TGAHi, TLSReg);
    return DAG.getNode(PPCISD::Lo, dl, PtrVT, TGALo, Hi);
  }
 
  if (Model == TLSModel::InitialExec) {
    bool IsPCRel = Subtarget.isUsingPCRelativeCalls();
    SDValue TGA = DAG.getTargetGlobalAddress(
        GV, dl, PtrVT, 0, IsPCRel ? PPCII::MO_GOT_TPREL_PCREL_FLAG : 0);
    SDValue TGATLS = DAG.getTargetGlobalAddress(
        GV, dl, PtrVT, 0,
        IsPCRel ? (PPCII::MO_TLS | PPCII::MO_PCREL_FLAG) : PPCII::MO_TLS);
    SDValue TPOffset;
    if (IsPCRel) {
      SDValue MatPCRel = DAG.getNode(PPCISD::MAT_PCREL_ADDR, dl, PtrVT, TGA);
      TPOffset = DAG.getLoad(MVT::i64, dl, DAG.getEntryNode(), MatPCRel,
                             MachinePointerInfo());
    } else {
      SDValue GOTPtr;
      if (is64bit) {
        setUsesTOCBasePtr(DAG);
        SDValue GOTReg = DAG.getRegister(PPC::X2, MVT::i64);
        GOTPtr =
            DAG.getNode(PPCISD::ADDIS_GOT_TPREL_HA, dl, PtrVT, GOTReg, TGA);
      } else {
        if (!TM.isPositionIndependent())
          GOTPtr = DAG.getNode(PPCISD::PPC32_GOT, dl, PtrVT);
        else if (picLevel == PICLevel::SmallPIC)
          GOTPtr = DAG.getNode(PPCISD::GlobalBaseReg, dl, PtrVT);
        else
          GOTPtr = DAG.getNode(PPCISD::PPC32_PICGOT, dl, PtrVT);
      }
      TPOffset = DAG.getNode(PPCISD::LD_GOT_TPREL_L, dl, PtrVT, TGA, GOTPtr);
    }
    return DAG.getNode(PPCISD::ADD_TLS, dl, PtrVT, TPOffset, TGATLS);
  }
 
  if (Model == TLSModel::GeneralDynamic) {
    if (Subtarget.isUsingPCRelativeCalls()) {
      SDValue TGA = DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0,
                                               PPCII::MO_GOT_TLSGD_PCREL_FLAG);
      return DAG.getNode(PPCISD::TLS_DYNAMIC_MAT_PCREL_ADDR, dl, PtrVT, TGA);
    }
 
    SDValue TGA = DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0, 0);
    SDValue GOTPtr;
    if (is64bit) {
      setUsesTOCBasePtr(DAG);
      SDValue GOTReg = DAG.getRegister(PPC::X2, MVT::i64);
      GOTPtr = DAG.getNode(PPCISD::ADDIS_TLSGD_HA, dl, PtrVT,
                                   GOTReg, TGA);
    } else {
      if (picLevel == PICLevel::SmallPIC)
        GOTPtr = DAG.getNode(PPCISD::GlobalBaseReg, dl, PtrVT);
      else
        GOTPtr = DAG.getNode(PPCISD::PPC32_PICGOT, dl, PtrVT);
    }
    return DAG.getNode(PPCISD::ADDI_TLSGD_L_ADDR, dl, PtrVT,
                       GOTPtr, TGA, TGA);
  }
 
  if (Model == TLSModel::LocalDynamic) {
    if (Subtarget.isUsingPCRelativeCalls()) {
      SDValue TGA = DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0,
                                               PPCII::MO_GOT_TLSLD_PCREL_FLAG);
      SDValue MatPCRel =
          DAG.getNode(PPCISD::TLS_DYNAMIC_MAT_PCREL_ADDR, dl, PtrVT, TGA);
      return DAG.getNode(PPCISD::PADDI_DTPREL, dl, PtrVT, MatPCRel, TGA);
    }
 
    SDValue TGA = DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0, 0);
    SDValue GOTPtr;
    if (is64bit) {
      setUsesTOCBasePtr(DAG);
      SDValue GOTReg = DAG.getRegister(PPC::X2, MVT::i64);
      GOTPtr = DAG.getNode(PPCISD::ADDIS_TLSLD_HA, dl, PtrVT,
                           GOTReg, TGA);
    } else {
      if (picLevel == PICLevel::SmallPIC)
        GOTPtr = DAG.getNode(PPCISD::GlobalBaseReg, dl, PtrVT);
      else
        GOTPtr = DAG.getNode(PPCISD::PPC32_PICGOT, dl, PtrVT);
    }
    SDValue TLSAddr = DAG.getNode(PPCISD::ADDI_TLSLD_L_ADDR, dl,
                                  PtrVT, GOTPtr, TGA, TGA);
    SDValue DtvOffsetHi = DAG.getNode(PPCISD::ADDIS_DTPREL_HA, dl,
                                      PtrVT, TLSAddr, TGA);
    return DAG.getNode(PPCISD::ADDI_DTPREL_L, dl, PtrVT, DtvOffsetHi, TGA);
  }
 
  llvm_unreachable("Unknown TLS model!");
}
 
SDValue PPCTargetLowering::LowerGlobalAddress(SDValue Op,
                                              SelectionDAG &DAG) const {
  EVT PtrVT = Op.getValueType();
  GlobalAddressSDNode *GSDN = cast<GlobalAddressSDNode>(Op);
  SDLoc DL(GSDN);
  const GlobalValue *GV = GSDN->getGlobal();
 
  // 64-bit SVR4 ABI & AIX ABI code is always position-independent.
  // The actual address of the GlobalValue is stored in the TOC.
  if (Subtarget.is64BitELFABI() || Subtarget.isAIXABI()) {
    if (Subtarget.isUsingPCRelativeCalls()) {
      EVT Ty = getPointerTy(DAG.getDataLayout());
      if (isAccessedAsGotIndirect(Op)) {
        SDValue GA = DAG.getTargetGlobalAddress(GV, DL, Ty, GSDN->getOffset(),
                                                PPCII::MO_PCREL_FLAG |
                                                    PPCII::MO_GOT_FLAG);
        SDValue MatPCRel = DAG.getNode(PPCISD::MAT_PCREL_ADDR, DL, Ty, GA);
        SDValue Load = DAG.getLoad(MVT::i64, DL, DAG.getEntryNode(), MatPCRel,
                                   MachinePointerInfo());
        return Load;
      } else {
        SDValue GA = DAG.getTargetGlobalAddress(GV, DL, Ty, GSDN->getOffset(),
                                                PPCII::MO_PCREL_FLAG);
        return DAG.getNode(PPCISD::MAT_PCREL_ADDR, DL, Ty, GA);
      }
    }
    setUsesTOCBasePtr(DAG);
    SDValue GA = DAG.getTargetGlobalAddress(GV, DL, PtrVT, GSDN->getOffset());
    return getTOCEntry(DAG, DL, GA);
  }
 
  unsigned MOHiFlag, MOLoFlag;
  bool IsPIC = isPositionIndependent();
  getLabelAccessInfo(IsPIC, Subtarget, MOHiFlag, MOLoFlag, GV);
 
  if (IsPIC && Subtarget.isSVR4ABI()) {
    SDValue GA = DAG.getTargetGlobalAddress(GV, DL, PtrVT,
                                            GSDN->getOffset(),
                                            PPCII::MO_PIC_FLAG);
    return getTOCEntry(DAG, DL, GA);
  }
 
  SDValue GAHi =
    DAG.getTargetGlobalAddress(GV, DL, PtrVT, GSDN->getOffset(), MOHiFlag);
  SDValue GALo =
    DAG.getTargetGlobalAddress(GV, DL, PtrVT, GSDN->getOffset(), MOLoFlag);
 
  return LowerLabelRef(GAHi, GALo, IsPIC, DAG);
}
 
SDValue PPCTargetLowering::LowerSETCC(SDValue Op, SelectionDAG &DAG) const {
  bool IsStrict = Op->isStrictFPOpcode();
  ISD::CondCode CC =
      cast<CondCodeSDNode>(Op.getOperand(IsStrict ? 3 : 2))->get();
  SDValue LHS = Op.getOperand(IsStrict ? 1 : 0);
  SDValue RHS = Op.getOperand(IsStrict ? 2 : 1);
  SDValue Chain = IsStrict ? Op.getOperand(0) : SDValue();
  EVT LHSVT = LHS.getValueType();
  SDLoc dl(Op);
 
  // Soften the setcc with libcall if it is fp128.
  if (LHSVT == MVT::f128) {
    assert(!Subtarget.hasP9Vector() &&
           "SETCC for f128 is already legal under Power9!");
    softenSetCCOperands(DAG, LHSVT, LHS, RHS, CC, dl, LHS, RHS, Chain,
                        Op->getOpcode() == ISD::STRICT_FSETCCS);
    if (RHS.getNode())
      LHS = DAG.getNode(ISD::SETCC, dl, Op.getValueType(), LHS, RHS,
                        DAG.getCondCode(CC));
    if (IsStrict)
      return DAG.getMergeValues({LHS, Chain}, dl);
    return LHS;
  }
 
  assert(!IsStrict && "Don't know how to handle STRICT_FSETCC!");
 
  if (Op.getValueType() == MVT::v2i64) {
    // When the operands themselves are v2i64 values, we need to do something
    // special because VSX has no underlying comparison operations for these.
    if (LHS.getValueType() == MVT::v2i64) {
      // Equality can be handled by casting to the legal type for Altivec
      // comparisons, everything else needs to be expanded.
      if (CC != ISD::SETEQ && CC != ISD::SETNE)
        return SDValue();
      SDValue SetCC32 = DAG.getSetCC(
          dl, MVT::v4i32, DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, LHS),
          DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, RHS), CC);
      int ShuffV[] = {1, 0, 3, 2};
      SDValue Shuff =
          DAG.getVectorShuffle(MVT::v4i32, dl, SetCC32, SetCC32, ShuffV);
      return DAG.getBitcast(MVT::v2i64,
                            DAG.getNode(CC == ISD::SETEQ ? ISD::AND : ISD::OR,
                                        dl, MVT::v4i32, Shuff, SetCC32));
    }
 
    // We handle most of these in the usual way.
    return Op;
  }
 
  // If we're comparing for equality to zero, expose the fact that this is
  // implemented as a ctlz/srl pair on ppc, so that the dag combiner can
  // fold the new nodes.
  if (SDValue V = lowerCmpEqZeroToCtlzSrl(Op, DAG))
    return V;
 
  if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(RHS)) {
    // Leave comparisons against 0 and -1 alone for now, since they're usually
    // optimized.  FIXME: revisit this when we can custom lower all setcc
    // optimizations.
    if (C->isAllOnes() || C->isZero())
      return SDValue();
  }
 
  // If we have an integer seteq/setne, turn it into a compare against zero
  // by xor'ing the rhs with the lhs, which is faster than setting a
  // condition register, reading it back out, and masking the correct bit.  The
  // normal approach here uses sub to do this instead of xor.  Using xor exposes
  // the result to other bit-twiddling opportunities.
  if (LHSVT.isInteger() && (CC == ISD::SETEQ || CC == ISD::SETNE)) {
    EVT VT = Op.getValueType();</