ValueTracking.cpp File Reference

#include "llvm/Analysis/ValueTracking.h"
#include "llvm/ADT/APFloat.h"
#include "llvm/ADT/APInt.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/ScopeExit.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/iterator_range.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/AssumeBundleQueries.h"
#include "llvm/Analysis/AssumptionCache.h"
#include "llvm/Analysis/ConstantFolding.h"
#include "llvm/Analysis/DomConditionCache.h"
#include "llvm/Analysis/GuardUtils.h"
#include "llvm/Analysis/InstructionSimplify.h"
#include "llvm/Analysis/Loads.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/Analysis/VectorUtils.h"
#include "llvm/Analysis/WithCache.h"
#include "llvm/IR/Argument.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Constant.h"
#include "llvm/IR/ConstantRange.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/DiagnosticInfo.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/EHPersonalities.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GetElementPtrTypeIterator.h"
#include "llvm/IR/GlobalAlias.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/IntrinsicsAArch64.h"
#include "llvm/IR/IntrinsicsAMDGPU.h"
#include "llvm/IR/IntrinsicsRISCV.h"
#include "llvm/IR/IntrinsicsX86.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Metadata.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Operator.h"
#include "llvm/IR/PatternMatch.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/User.h"
#include "llvm/IR/Value.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/KnownBits.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/TargetParser/RISCVTargetParser.h"
#include <algorithm>
#include <cassert>
#include <cstdint>
#include <optional>
#include <utility>

Go to the source code of this file.

Enumerations
enum class	UndefPoisonKind { PoisonOnly = (1 << 0) , UndefOnly = (1 << 1) , UndefOrPoison = PoisonOnly | UndefOnly }

Functions
static unsigned	getBitWidth (Type *Ty, const DataLayout &DL)
	Returns the bitwidth of the given scalar or pointer type.
static const Instruction *	safeCxtI (const Value *V, const Instruction *CxtI)
static const Instruction *	safeCxtI (const Value *V1, const Value *V2, const Instruction *CxtI)
static bool	getShuffleDemandedElts (const ShuffleVectorInst *Shuf, const APInt &DemandedElts, APInt &DemandedLHS, APInt &DemandedRHS)
static void	computeKnownBits (const Value *V, const APInt &DemandedElts, KnownBits &Known, unsigned Depth, const SimplifyQuery &Q)
	Determine which bits of V are known to be either zero or one and return them in the Known bit set.
static bool	haveNoCommonBitsSetSpecialCases (const Value *LHS, const Value *RHS, const SimplifyQuery &SQ)
static bool	isKnownNonZero (const Value *V, const APInt &DemandedElts, const SimplifyQuery &Q, unsigned Depth)
	Return true if the given value is known to be non-zero when defined.
static bool	isKnownNonEqual (const Value *V1, const Value *V2, const APInt &DemandedElts, unsigned Depth, const SimplifyQuery &Q)
	Return true if it is known that V1 != V2.
static unsigned	ComputeNumSignBits (const Value *V, const APInt &DemandedElts, unsigned Depth, const SimplifyQuery &Q)
static unsigned	ComputeNumSignBits (const Value *V, unsigned Depth, const SimplifyQuery &Q)
static void	computeKnownBitsAddSub (bool Add, const Value *Op0, const Value *Op1, bool NSW, bool NUW, const APInt &DemandedElts, KnownBits &KnownOut, KnownBits &Known2, unsigned Depth, const SimplifyQuery &Q)
static void	computeKnownBitsMul (const Value *Op0, const Value *Op1, bool NSW, bool NUW, const APInt &DemandedElts, KnownBits &Known, KnownBits &Known2, unsigned Depth, const SimplifyQuery &Q)
static bool	isEphemeralValueOf (const Instruction *I, const Value *E)
static bool	cmpExcludesZero (CmpInst::Predicate Pred, const Value *RHS)
static bool	isKnownNonZeroFromAssume (const Value *V, const SimplifyQuery &Q)
static void	computeKnownBitsFromCmp (const Value *V, CmpInst::Predicate Pred, Value *LHS, Value *RHS, KnownBits &Known, const SimplifyQuery &Q)
static void	computeKnownBitsFromICmpCond (const Value *V, ICmpInst *Cmp, KnownBits &Known, const SimplifyQuery &SQ, bool Invert)
static void	computeKnownBitsFromCond (const Value *V, Value *Cond, KnownBits &Known, unsigned Depth, const SimplifyQuery &SQ, bool Invert)
static void	computeKnownBitsFromShiftOperator (const Operator *I, const APInt &DemandedElts, KnownBits &Known, KnownBits &Known2, unsigned Depth, const SimplifyQuery &Q, function_ref< KnownBits(const KnownBits &, const KnownBits &, bool)> KF)
	Compute known bits from a shift operator, including those with a non-constant shift amount.
static KnownBits	getKnownBitsFromAndXorOr (const Operator *I, const APInt &DemandedElts, const KnownBits &KnownLHS, const KnownBits &KnownRHS, unsigned Depth, const SimplifyQuery &Q)
static KnownBits	computeKnownBitsForHorizontalOperation (const Operator *I, const APInt &DemandedElts, unsigned Depth, const SimplifyQuery &Q, const function_ref< KnownBits(const KnownBits &, const KnownBits &)> KnownBitsFunc)
static bool	isSignedMinMaxClamp (const Value *Select, const Value *&In, const APInt *&CLow, const APInt *&CHigh)
static bool	isSignedMinMaxIntrinsicClamp (const IntrinsicInst *II, const APInt *&CLow, const APInt *&CHigh)
static void	unionWithMinMaxIntrinsicClamp (const IntrinsicInst *II, KnownBits &Known)
static void	computeKnownBitsFromOperator (const Operator *I, const APInt &DemandedElts, KnownBits &Known, unsigned Depth, const SimplifyQuery &Q)
static bool	isPowerOfTwoRecurrence (const PHINode *PN, bool OrZero, unsigned Depth, SimplifyQuery &Q)
	Try to detect a recurrence that the value of the induction variable is always a power of two (or zero).
static bool	isImpliedToBeAPowerOfTwoFromCond (const Value *V, bool OrZero, const Value *Cond, bool CondIsTrue)
	Return true if we can infer that V is known to be a power of 2 from dominating condition Cond (e.g., ctpop(V) == 1).
static bool	isGEPKnownNonNull (const GEPOperator *GEP, unsigned Depth, const SimplifyQuery &Q)
	Test whether a GEP's result is known to be non-null.
static bool	isKnownNonNullFromDominatingCondition (const Value *V, const Instruction *CtxI, const DominatorTree *DT)
static bool	rangeMetadataExcludesValue (const MDNode *Ranges, const APInt &Value)
	Does the 'Range' metadata (which must be a valid MD_range operand list) ensure that the value it's attached to is never Value? 'RangeType' is is the type of the value described by the range.
static bool	isNonZeroRecurrence (const PHINode *PN)
	Try to detect a recurrence that monotonically increases/decreases from a non-zero starting value.
static bool	matchOpWithOpEqZero (Value *Op0, Value *Op1)
static bool	isNonZeroAdd (const APInt &DemandedElts, unsigned Depth, const SimplifyQuery &Q, unsigned BitWidth, Value *X, Value *Y, bool NSW, bool NUW)
static bool	isNonZeroSub (const APInt &DemandedElts, unsigned Depth, const SimplifyQuery &Q, unsigned BitWidth, Value *X, Value *Y)
static bool	isNonZeroMul (const APInt &DemandedElts, unsigned Depth, const SimplifyQuery &Q, unsigned BitWidth, Value *X, Value *Y, bool NSW, bool NUW)
static bool	isNonZeroShift (const Operator *I, const APInt &DemandedElts, unsigned Depth, const SimplifyQuery &Q, const KnownBits &KnownVal)
static bool	isKnownNonZeroFromOperator (const Operator *I, const APInt &DemandedElts, unsigned Depth, const SimplifyQuery &Q)
static std::optional< std::pair< Value *, Value * > >	getInvertibleOperands (const Operator *Op1, const Operator *Op2)
	If the pair of operators are the same invertible function, return the the operands of the function corresponding to each input.
static bool	isModifyingBinopOfNonZero (const Value *V1, const Value *V2, const APInt &DemandedElts, unsigned Depth, const SimplifyQuery &Q)
	Return true if V1 == (binop V2, X), where X is known non-zero.
static bool	isNonEqualMul (const Value *V1, const Value *V2, const APInt &DemandedElts, unsigned Depth, const SimplifyQuery &Q)
	Return true if V2 == V1 * C, where V1 is known non-zero, C is not 0/1 and the multiplication is nuw or nsw.
static bool	isNonEqualShl (const Value *V1, const Value *V2, const APInt &DemandedElts, unsigned Depth, const SimplifyQuery &Q)
	Return true if V2 == V1 << C, where V1 is known non-zero, C is not 0 and the shift is nuw or nsw.
static bool	isNonEqualPHIs (const PHINode *PN1, const PHINode *PN2, const APInt &DemandedElts, unsigned Depth, const SimplifyQuery &Q)
static bool	isNonEqualSelect (const Value *V1, const Value *V2, const APInt &DemandedElts, unsigned Depth, const SimplifyQuery &Q)
static bool	isNonEqualPointersWithRecursiveGEP (const Value *A, const Value *B, const SimplifyQuery &Q)
static unsigned	computeNumSignBitsVectorConstant (const Value *V, const APInt &DemandedElts, unsigned TyBits)
	For vector constants, loop over the elements and find the constant with the minimum number of sign bits.
static unsigned	ComputeNumSignBitsImpl (const Value *V, const APInt &DemandedElts, unsigned Depth, const SimplifyQuery &Q)
	Return the number of times the sign bit of the register is replicated into the other bits.
static bool	inputDenormalIsIEEE (const Function &F, const Type *Ty)
	Return true if it's possible to assume IEEE treatment of input denormals in F for Val.
static bool	inputDenormalIsIEEEOrPosZero (const Function &F, const Type *Ty)
static bool	outputDenormalIsIEEEOrPosZero (const Function &F, const Type *Ty)
static std::tuple< Value *, FPClassTest, FPClassTest >	exactClass (Value *V, FPClassTest M)
	Return the return value for fcmpImpliesClass for a compare that produces an exact class test.
static void	computeKnownFPClassFromCond (const Value *V, Value *Cond, unsigned Depth, bool CondIsTrue, const Instruction *CxtI, KnownFPClass &KnownFromContext)
static KnownFPClass	computeKnownFPClassFromContext (const Value *V, const SimplifyQuery &Q)
void	computeKnownFPClass (const Value *V, const APInt &DemandedElts, FPClassTest InterestedClasses, KnownFPClass &Known, unsigned Depth, const SimplifyQuery &Q)
static void	computeKnownFPClass (const Value *V, KnownFPClass &Known, FPClassTest InterestedClasses, unsigned Depth, const SimplifyQuery &Q)
static void	computeKnownFPClassForFPTrunc (const Operator *Op, const APInt &DemandedElts, FPClassTest InterestedClasses, KnownFPClass &Known, unsigned Depth, const SimplifyQuery &Q)
static Value *	BuildSubAggregate (Value *From, Value *To, Type *IndexedType, SmallVectorImpl< unsigned > &Idxs, unsigned IdxSkip, BasicBlock::iterator InsertBefore)
static Value *	BuildSubAggregate (Value *From, ArrayRef< unsigned > idx_range, BasicBlock::iterator InsertBefore)
static uint64_t	GetStringLengthH (const Value *V, SmallPtrSetImpl< const PHINode * > &PHIs, unsigned CharSize)
	If we can compute the length of the string pointed to by the specified pointer, return 'len+1'.
static bool	isSameUnderlyingObjectInLoop (const PHINode *PN, const LoopInfo *LI)
	PN defines a loop-variant pointer to an object.
static const Value *	getUnderlyingObjectFromInt (const Value *V)
	This is the function that does the work of looking through basic ptrtoint+arithmetic+inttoptr sequences.
static bool	onlyUsedByLifetimeMarkersOrDroppableInstsHelper (const Value *V, bool AllowLifetime, bool AllowDroppable)
static OverflowResult	mapOverflowResult (ConstantRange::OverflowResult OR)
	Convert ConstantRange OverflowResult into ValueTracking OverflowResult.
static OverflowResult	computeOverflowForSignedAdd (const WithCache< const Value * > &LHS, const WithCache< const Value * > &RHS, const AddOperator *Add, const SimplifyQuery &SQ)
static bool	shiftAmountKnownInRange (const Value *ShiftAmount)
	Shifts return poison if shiftwidth is larger than the bitwidth.
static bool	includesPoison (UndefPoisonKind Kind)
static bool	includesUndef (UndefPoisonKind Kind)
static bool	canCreateUndefOrPoison (const Operator *Op, UndefPoisonKind Kind, bool ConsiderFlagsAndMetadata)
static bool	directlyImpliesPoison (const Value *ValAssumedPoison, const Value *V, unsigned Depth)
static bool	impliesPoison (const Value *ValAssumedPoison, const Value *V, unsigned Depth)
static bool	programUndefinedIfUndefOrPoison (const Value *V, bool PoisonOnly)
static bool	isGuaranteedNotToBeUndefOrPoison (const Value *V, AssumptionCache *AC, const Instruction *CtxI, const DominatorTree *DT, unsigned Depth, UndefPoisonKind Kind)
template<typename CallableT >
static bool	handleGuaranteedWellDefinedOps (const Instruction *I, const CallableT &Handle)
	Enumerates all operands of I that are guaranteed to not be undef or poison.
template<typename CallableT >
static bool	handleGuaranteedNonPoisonOps (const Instruction *I, const CallableT &Handle)
	Enumerates all operands of I that are guaranteed to not be poison.
static bool	isKnownNonNaN (const Value *V, FastMathFlags FMF)
static bool	isKnownNonZero (const Value *V)
static SelectPatternResult	matchFastFloatClamp (CmpInst::Predicate Pred, Value *CmpLHS, Value *CmpRHS, Value *TrueVal, Value *FalseVal, Value *&LHS, Value *&RHS)
	Match clamp pattern for float types without care about NaNs or signed zeros.
static SelectPatternResult	matchClamp (CmpInst::Predicate Pred, Value *CmpLHS, Value *CmpRHS, Value *TrueVal, Value *FalseVal)
	Recognize variations of: CLAMP(v,l,h) ==> ((v) < (l) ? (l) : ((v) > (h) ? (h) : (v)))
static SelectPatternResult	matchMinMaxOfMinMax (CmpInst::Predicate Pred, Value *CmpLHS, Value *CmpRHS, Value *TVal, Value *FVal, unsigned Depth)
	Recognize variations of: a < c ? min(a,b) : min(b,c) ==> min(min(a,b),min(b,c))
static Value *	getNotValue (Value *V)
	If the input value is the result of a 'not' op, constant integer, or vector splat of a constant integer, return the bitwise-not source value.
static SelectPatternResult	matchMinMax (CmpInst::Predicate Pred, Value *CmpLHS, Value *CmpRHS, Value *TrueVal, Value *FalseVal, Value *&LHS, Value *&RHS, unsigned Depth)
	Match non-obvious integer minimum and maximum sequences.
static SelectPatternResult	matchSelectPattern (CmpInst::Predicate Pred, FastMathFlags FMF, Value *CmpLHS, Value *CmpRHS, Value *TrueVal, Value *FalseVal, Value *&LHS, Value *&RHS, unsigned Depth)
static Value *	lookThroughCastConst (CmpInst *CmpI, Type *SrcTy, Constant *C, Instruction::CastOps *CastOp)
static Value *	lookThroughCast (CmpInst *CmpI, Value *V1, Value *V2, Instruction::CastOps *CastOp)
	Helps to match a select pattern in case of a type mismatch.
static bool	isTruePredicate (CmpInst::Predicate Pred, const Value *LHS, const Value *RHS)
	Return true if "icmp Pred LHS RHS" is always true.
static std::optional< bool >	isImpliedCondOperands (CmpInst::Predicate Pred, const Value *ALHS, const Value *ARHS, const Value *BLHS, const Value *BRHS)
	Return true if "icmp Pred BLHS BRHS" is true whenever "icmp Pred ALHS ARHS" is true.
static std::optional< bool >	isImpliedCondCommonOperandWithCR (CmpPredicate LPred, const ConstantRange &LCR, CmpPredicate RPred, const ConstantRange &RCR)
	Return true if "icmp LPred X, LCR" implies "icmp RPred X, RCR" is true.
static std::optional< bool >	isImpliedCondICmps (const ICmpInst *LHS, CmpPredicate RPred, const Value *R0, const Value *R1, const DataLayout &DL, bool LHSIsTrue)
	Return true if LHS implies RHS (expanded to its components as "R0 RPred R1") is true.
static std::optional< bool >	isImpliedCondAndOr (const Instruction *LHS, CmpPredicate RHSPred, const Value *RHSOp0, const Value *RHSOp1, const DataLayout &DL, bool LHSIsTrue, unsigned Depth)
	Return true if LHS implies RHS is true.
static std::pair< Value *, bool >	getDomPredecessorCondition (const Instruction *ContextI)
static void	setLimitsForBinOp (const BinaryOperator &BO, APInt &Lower, APInt &Upper, const InstrInfoQuery &IIQ, bool PreferSignedRange)
static ConstantRange	getRangeForIntrinsic (const IntrinsicInst &II, bool UseInstrInfo)
static ConstantRange	getRangeForSelectPattern (const SelectInst &SI, const InstrInfoQuery &IIQ)
static void	setLimitForFPToI (const Instruction *I, APInt &Lower, APInt &Upper)
static void	addValueAffectedByCondition (Value *V, function_ref< void(Value *)> InsertAffected)

Variables
static cl::opt< unsigned >	DomConditionsMaxUses ("dom-conditions-max-uses", cl::Hidden, cl::init(20))

Enumeration Type Documentation

UndefPoisonKind

enum class UndefPoisonKind

strong

Enumerator
PoisonOnly
UndefOnly
UndefOrPoison

Definition at line 7455 of file ValueTracking.cpp.

Function Documentation

addValueAffectedByCondition()

static void addValueAffectedByCondition ( Value *  V, function_ref< void(Value *)>  InsertAffected  )

static

Definition at line 10152 of file ValueTracking.cpp.

References assert(), I, llvm::PatternMatch::m_CombineOr(), llvm::PatternMatch::m_PtrToInt(), llvm::PatternMatch::m_Trunc(), llvm::PatternMatch::m_Value(), and llvm::PatternMatch::match().

Referenced by llvm::findValuesAffectedByCondition().

BuildSubAggregate() [1/2]

static Value * BuildSubAggregate ( Value *  From, ArrayRef< unsigned >  idx_range, BasicBlock::iterator  InsertBefore  )

static

Definition at line 6347 of file ValueTracking.cpp.

References BuildSubAggregate(), From, llvm::PoisonValue::get(), llvm::ExtractValueInst::getIndexedType(), and llvm::SmallVectorBase< Size_T >::size().

BuildSubAggregate() [2/2]

static Value * BuildSubAggregate ( Value *  From, Value *  To, Type *  IndexedType, SmallVectorImpl< unsigned > &  Idxs, unsigned  IdxSkip, BasicBlock::iterator  InsertBefore  )

static

Definition at line 6288 of file ValueTracking.cpp.

References BuildSubAggregate(), llvm::InsertValueInst::Create(), llvm::Instruction::eraseFromParent(), llvm::FindInsertedValue(), From, llvm::InsertValueInst::getAggregateOperand(), llvm::StructType::getElementType(), llvm::StructType::getNumElements(), llvm::SmallVectorTemplateBase< T, bool >::pop_back(), and llvm::SmallVectorTemplateBase< T, bool >::push_back().

Referenced by BuildSubAggregate(), and llvm::FindInsertedValue().

canCreateUndefOrPoison()

static bool canCreateUndefOrPoison ( const Operator *  Op, UndefPoisonKind  Kind, bool  ConsiderFlagsAndMetadata  )

static

Definition at line 7469 of file ValueTracking.cpp.

References Idx, II, includesPoison(), llvm::is_contained(), llvm::Instruction::isBinaryOp(), llvm::PoisonMaskElem, and shiftAmountKnownInRange().

cmpExcludesZero()

static bool cmpExcludesZero ( CmpInst::Predicate  Pred, const Value *  RHS  )

static

Definition at line 564 of file ValueTracking.cpp.

References llvm::CallingConv::C, llvm::ConstantRange::contains(), llvm::Type::getScalarSizeInBits(), llvm::Value::getType(), llvm::APInt::getZero(), llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_Zero(), llvm::ConstantRange::makeExactICmpRegion(), llvm::PatternMatch::match(), and RHS.

Referenced by isKnownNonNullFromDominatingCondition(), isKnownNonZeroFromAssume(), and isKnownNonZeroFromOperator().

computeKnownBits()

void computeKnownBits ( const Value *  V, const APInt &  DemandedElts, KnownBits &  Known, unsigned  Depth, const SimplifyQuery &  Q  )

static

Determine which bits of V are known to be either zero or one and return them in the Known bit set.

NOTE: we cannot consider 'undef' to be "IsZero" here. The problem is that we cannot optimize based on the assumption that it is zero without changing it to be an explicit zero. If we don't change it to zero, other code could optimized based on the contradictory assumption that it is non-zero. Because instcombine aggressively folds operations with undef args anyway, this won't lose us code quality.

This function is defined on values with integer type, values with pointer type, and vectors of integers. In the case where V is a vector, known zero, and known one values are the same width as the vector element, and the bit is set only if it is true for all of the demanded elements in the vector specified by DemandedElts.

Definition at line 2129 of file ValueTracking.cpp.

References A, assert(), llvm::BitWidth, llvm::CallingConv::C, computeKnownBits(), llvm::computeKnownBitsFromContext(), computeKnownBitsFromOperator(), llvm::Depth, llvm::SimplifyQuery::DL, llvm::Constant::getAggregateElement(), llvm::APInt::getBitWidth(), llvm::KnownBits::getBitWidth(), llvm::DataLayout::getPointerTypeSizeInBits(), llvm::Type::getScalarType(), llvm::DataLayout::getTypeSizeInBits(), llvm::KnownBits::hasConflict(), I, llvm::Type::isIntOrIntVectorTy(), llvm::Type::isPointerTy(), llvm::Type::isPtrOrPtrVectorTy(), llvm::Log2(), llvm::PatternMatch::m_APInt(), llvm::KnownBits::makeConstant(), llvm::PatternMatch::match(), llvm::MaxAnalysisRecursionDepth, llvm::KnownBits::One, Range, llvm::KnownBits::resetAll(), llvm::APInt::setAllBits(), llvm::KnownBits::setAllZero(), llvm::APInt::setLowBits(), llvm::ConstantRange::toKnownBits(), and llvm::KnownBits::Zero.

Referenced by computeKnownBits(), llvm::computeKnownBits(), computeKnownBitsAddSub(), computeKnownBitsForHorizontalOperation(), computeKnownBitsFromOperator(), computeKnownBitsFromShiftOperator(), computeKnownBitsMul(), ComputeNumSignBitsImpl(), getKnownBitsFromAndXorOr(), llvm::isKnownNegative(), isKnownNonEqual(), llvm::isKnownNonNegative(), isKnownNonZeroFromOperator(), llvm::isKnownPositive(), llvm::isKnownToBeAPowerOfTwo(), isNonZeroAdd(), isNonZeroMul(), isNonZeroShift(), and llvm::MaskedValueIsZero().

computeKnownBitsAddSub()

static void computeKnownBitsAddSub ( bool  Add, const Value *  Op0, const Value *  Op1, bool  NSW, bool  NUW, const APInt &  DemandedElts, KnownBits &  KnownOut, KnownBits &  Known2, unsigned  Depth, const SimplifyQuery &  Q  )

static

Definition at line 367 of file ValueTracking.cpp.

References llvm::Add, llvm::KnownBits::computeForAddSub(), computeKnownBits(), llvm::Depth, and llvm::KnownBits::isUnknown().

Referenced by computeKnownBitsFromOperator().

computeKnownBitsForHorizontalOperation()

static KnownBits computeKnownBitsForHorizontalOperation ( const Operator *  I, const APInt &  DemandedElts, unsigned  Depth, const SimplifyQuery &  Q, const function_ref< KnownBits(const KnownBits &, const KnownBits &)>  KnownBitsFunc  )

static

Definition at line 988 of file ValueTracking.cpp.

References computeKnownBits(), llvm::Depth, llvm::SimplifyQuery::DL, llvm::getHorizDemandedEltsForFirstOperand(), llvm::DataLayout::getTypeSizeInBits(), I, and llvm::APInt::isZero().

Referenced by llvm::X86TargetLowering::computeKnownBitsForTargetNode(), and computeKnownBitsFromOperator().

computeKnownBitsFromCmp()

static void computeKnownBitsFromCmp ( const Value *  V, CmpInst::Predicate  Pred, Value *  LHS, Value *  RHS, KnownBits &  Known, const SimplifyQuery &  Q  )

static

Definition at line 642 of file ValueTracking.cpp.

References llvm::BitWidth, llvm::CallingConv::C, llvm::SimplifyQuery::DL, llvm::KnownBits::getBitWidth(), llvm::Value::getType(), llvm::Type::isPointerTy(), LHS, llvm::APInt::lshrInPlace(), llvm::PatternMatch::m_AddLike(), llvm::PatternMatch::m_And(), llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_c_And(), llvm::PatternMatch::m_c_NUWAdd(), llvm::PatternMatch::m_c_Or(), llvm::PatternMatch::m_CombineOr(), llvm::PatternMatch::m_ConstantInt(), llvm::PatternMatch::m_NUWSub(), llvm::PatternMatch::m_Power2(), llvm::PatternMatch::m_PtrToIntSameSize(), llvm::PatternMatch::m_Shl(), llvm::PatternMatch::m_Shr(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::m_Xor(), llvm::PatternMatch::m_Zero(), llvm::ConstantRange::makeAllowedICmpRegion(), llvm::KnownBits::makeConstant(), llvm::KnownBits::makeNegative(), llvm::KnownBits::makeNonNegative(), llvm::PatternMatch::match(), llvm::Offset, llvm::KnownBits::One, RHS, llvm::KnownBits::setAllZero(), llvm::APInt::setHighBits(), llvm::ConstantRange::sub(), llvm::ConstantRange::toKnownBits(), llvm::KnownBits::unionWith(), Y, and llvm::KnownBits::Zero.

Referenced by computeKnownBitsFromICmpCond().

computeKnownBitsFromCond()

static void computeKnownBitsFromCond ( const Value *  V, Value *  Cond, KnownBits &  Known, unsigned  Depth, const SimplifyQuery &  SQ, bool  Invert  )

static

Definition at line 773 of file ValueTracking.cpp.

References A, B, computeKnownBitsFromCond(), computeKnownBitsFromICmpCond(), Cond, llvm::Depth, llvm::KnownBits::getBitWidth(), llvm::KnownBits::intersectWith(), llvm::PatternMatch::m_LogicalAnd(), llvm::PatternMatch::m_LogicalOp(), llvm::PatternMatch::m_LogicalOr(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), llvm::MaxAnalysisRecursionDepth, and llvm::KnownBits::unionWith().

Referenced by llvm::adjustKnownBitsForSelectArm(), computeKnownBitsFromCond(), and llvm::computeKnownBitsFromContext().

computeKnownBitsFromICmpCond()

static void computeKnownBitsFromICmpCond ( const Value *  V, ICmpInst *  Cmp, KnownBits &  Known, const SimplifyQuery &  SQ, bool  Invert  )

static

Definition at line 754 of file ValueTracking.cpp.

References llvm::KnownBits::anyext(), computeKnownBitsFromCmp(), llvm::KnownBits::getBitWidth(), llvm::Type::getScalarSizeInBits(), llvm::Value::getType(), LHS, llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_Trunc(), llvm::PatternMatch::match(), RHS, and llvm::KnownBits::unionWith().

Referenced by computeKnownBitsFromCond(), and llvm::computeKnownBitsFromContext().

computeKnownBitsFromOperator()

static void computeKnownBitsFromOperator ( const Operator *  I, const APInt &  DemandedElts, KnownBits &  Known, unsigned  Depth, const SimplifyQuery &  Q  )

static

Definition at line 1139 of file ValueTracking.cpp.

References llvm::KnownBits::abs(), llvm::SimplifyQuery::AC, llvm::KnownBits::add(), llvm::adjustKnownBitsForSelectArm(), llvm::KnownBits::anyextOrTrunc(), llvm::KnownBits::ashr(), assert(), llvm::bit_width(), llvm::APFloat::bitcastToAPInt(), llvm::BitWidth, llvm::APInt::byteSwap(), llvm::CallingConv::C, llvm::APInt::clearAllBits(), llvm::APInt::clearBit(), llvm::APInt::clearSignBit(), computeKnownBits(), computeKnownBitsAddSub(), computeKnownBitsForHorizontalOperation(), llvm::computeKnownBitsFromRangeMetadata(), computeKnownBitsFromShiftOperator(), computeKnownBitsMul(), computeKnownFPClass(), llvm::KnownBits::countMaxLeadingZeros(), llvm::KnownBits::countMaxPopulation(), llvm::KnownBits::countMaxTrailingZeros(), llvm::KnownBits::countMinLeadingOnes(), llvm::KnownBits::countMinLeadingZeros(), llvm::KnownBits::countMinTrailingZeros(), llvm::countr_zero(), llvm::SimplifyQuery::CxtI, llvm::RISCVVType::decodeVSEW(), llvm::Depth, llvm::SimplifyQuery::DL, llvm::SimplifyQuery::DT, llvm::fcAllFlags, llvm::fcInf, llvm::fcNan, llvm::fcNone, llvm::fcNormal, llvm::fcSubnormal, llvm::fcZero, llvm::gep_type_begin(), getAlign(), llvm::APInt::getAllOnes(), llvm::APInt::getBitWidth(), llvm::KnownBits::getBitWidth(), llvm::KnownBits::getConstant(), llvm::StructLayout::getElementOffset(), llvm::generic_gep_type_iterator< ItTy >::getIndexedType(), llvm::ExtractValueInst::getIndices(), llvm::APFloat::getInf(), llvm::CmpInst::getInversePredicate(), getKnownBitsFromAndXorOr(), llvm::details::FixedOrScalableQuantity< LeafTy, ValueTy >::getKnownMinValue(), llvm::InstrInfoQuery::getMetadata(), llvm::ExtractValueInst::getNumIndices(), llvm::APInt::getOneBitSet(), llvm::BinaryOperator::getOpcode(), llvm::User::getOperand(), llvm::DataLayout::getPointerTypeSizeInBits(), llvm::Type::getScalarType(), llvm::generic_gep_type_iterator< ItTy >::getSequentialElementStride(), llvm::RISCVVType::getSEWLMULRatio(), getShuffleDemandedElts(), llvm::Constant::getSplatValue(), llvm::DataLayout::getStructLayout(), llvm::generic_gep_type_iterator< ItTy >::getStructTypeOrNull(), llvm::ConstantInt::getTrue(), llvm::Value::getType(), llvm::DataLayout::getTypeSizeInBits(), llvm::ConstantRange::getUnsignedMax(), llvm::getVScaleRange(), llvm::SimplifyQuery::getWithoutCondContext(), llvm::APInt::getZero(), llvm::APInt::getZExtValue(), llvm::KnownBits::hasConflict(), llvm::InstrInfoQuery::hasNoSignedWrap(), llvm::InstrInfoQuery::hasNoUnsignedWrap(), I, Idx, II, llvm::SimplifyQuery::IIQ, llvm::KnownBits::insertBits(), llvm::KnownBits::intersectWith(), llvm::KnownBits::isConstant(), llvm::InstrInfoQuery::isExact(), llvm::isGuaranteedNotToBePoison(), llvm::Type::isIntOrPtrTy(), llvm::DataLayout::isLittleEndian(), llvm::KnownBits::isNegative(), llvm::KnownBits::isNonNegative(), llvm::Type::isPointerTy(), llvm::details::FixedOrScalableQuantity< LeafTy, ValueTy >::isScalable(), llvm::Type::isSized(), llvm::KnownBits::isUnknown(), llvm::Type::isVectorTy(), llvm::APInt::isZero(), llvm::Constant::isZeroValue(), LHS, llvm::Log2(), llvm::Log2_32(), llvm::KnownBits::lshr(), llvm::APInt::lshr(), llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_BasicBlock(), llvm::PatternMatch::m_Br(), llvm::PatternMatch::m_c_ICmp(), llvm::PatternMatch::m_ElementWiseBitCast(), llvm::PatternMatch::m_One(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_Value(), llvm::KnownBits::makeConstant(), llvm::ConstantRange::makeExactICmpRegion(), llvm::KnownBits::makeNegative(), llvm::KnownBits::makeNonNegative(), llvm::PatternMatch::match(), llvm::matchSimpleRecurrence(), llvm::MaxAnalysisRecursionDepth, llvm::KnownBits::mul(), llvm::KnownBits::mulhs(), llvm::KnownBits::mulhu(), llvm::Offset, llvm::KnownBits::One, P, Range, llvm::KnownBits::resetAll(), llvm::APInt::reverseBits(), RHS, llvm::RISCV::RVVBitsPerBlock, llvm::KnownBits::sadd_sat(), llvm::KnownBits::sdiv(), llvm::APInt::setAllBits(), llvm::APInt::setBit(), llvm::APInt::setBitsFrom(), llvm::APInt::setHighBits(), llvm::APInt::setLowBits(), llvm::KnownBits::sext(), llvm::KnownBits::sextOrTrunc(), llvm::APInt::sextOrTrunc(), llvm::KnownBits::shl(), llvm::APInt::shl(), llvm::KnownBits::smax(), llvm::KnownBits::smin(), llvm::KnownBits::srem(), llvm::KnownBits::ssub_sat(), llvm::KnownBits::sub(), llvm::ConstantRange::toKnownBits(), llvm::KnownBits::trunc(), llvm::KnownBits::uadd_sat(), llvm::KnownBits::udiv(), llvm::KnownBits::umax(), llvm::KnownBits::umin(), llvm::KnownBits::unionWith(), unionWithMinMaxIntrinsicClamp(), llvm::APInt::urem(), llvm::KnownBits::urem(), llvm::KnownBits::usub_sat(), llvm::KnownBits::Zero, and llvm::KnownBits::zextOrTrunc().

Referenced by computeKnownBits().

computeKnownBitsFromShiftOperator()

static void computeKnownBitsFromShiftOperator ( const Operator *  I, const APInt &  DemandedElts, KnownBits &  Known, KnownBits &  Known2, unsigned  Depth, const SimplifyQuery &  Q, function_ref< KnownBits(const KnownBits &, const KnownBits &, bool)>  KF  )

static

Compute known bits from a shift operator, including those with a non-constant shift amount.

Known is the output of this function. Known2 is a pre-allocated temporary with the same bit width as Known and on return contains the known bit of the shift value source. KF is an operator-specific function that, given the known-bits and a shift amount, compute the implied known-bits of the shift operator's result respectively for that shift amount. The results from calling KF are conservatively combined for all permitted shift amounts.

Definition at line 902 of file ValueTracking.cpp.

References computeKnownBits(), llvm::Depth, llvm::KnownBits::getBitWidth(), llvm::KnownBits::getMaxValue(), I, isKnownNonZero(), llvm::KnownBits::isNonZero(), and llvm::APInt::ult().

Referenced by computeKnownBitsFromOperator().

computeKnownBitsMul()

static void computeKnownBitsMul ( const Value *  Op0, const Value *  Op1, bool  NSW, bool  NUW, const APInt &  DemandedElts, KnownBits &  Known, KnownBits &  Known2, unsigned  Depth, const SimplifyQuery &  Q  )

static

Definition at line 383 of file ValueTracking.cpp.

References llvm::SimplifyQuery::AC, computeKnownBits(), llvm::SimplifyQuery::CxtI, llvm::Depth, llvm::SimplifyQuery::DT, llvm::KnownBits::getBitWidth(), llvm::isGuaranteedNotToBeUndef(), llvm::isKnownNegative(), llvm::isKnownNonNegative(), llvm::KnownBits::isNegative(), llvm::KnownBits::isNonNegative(), llvm::KnownBits::isNonZero(), llvm::KnownBits::makeConstant(), llvm::KnownBits::makeNegative(), llvm::KnownBits::makeNonNegative(), llvm::KnownBits::mul(), and llvm::KnownBits::sgt().

Referenced by computeKnownBitsFromOperator().

computeKnownFPClass() [1/2]

void computeKnownFPClass	(	const Value *	V,
		const APInt &	DemandedElts,
		FPClassTest	InterestedClasses,
		KnownFPClass &	Known,
		unsigned	Depth,
		const SimplifyQuery &	Q
	)

Definition at line 5033 of file ValueTracking.cpp.

References llvm::SimplifyQuery::AC, assert(), llvm::APFloat::bitcastToAPInt(), llvm::BitWidth, llvm::CallingConv::C, llvm::KnownFPClass::cannotBeOrderedGreaterThanZero(), llvm::KnownFPClass::cannotBeOrderedLessThanZero(), llvm::APInt::clearBit(), llvm::computeConstantRange(), llvm::computeKnownBits(), llvm::computeKnownFPClass(), computeKnownFPClassForFPTrunc(), computeKnownFPClassFromContext(), Cond, llvm::KnownFPClass::copysign(), llvm::SimplifyQuery::CxtI, llvm::Depth, llvm::SimplifyQuery::DT, llvm::KnownBits::eq(), F, llvm::KnownFPClass::fabs(), llvm::fcAllFlags, llvm::fcInf, llvm::fcmpImpliesClass(), llvm::fcNan, llvm::fcNegative, llvm::fcNegFinite, llvm::fcNegInf, llvm::fcNegNormal, llvm::fcNegSubnormal, llvm::fcNegZero, llvm::fcNone, llvm::fcPosFinite, llvm::fcPosInf, llvm::fcPositive, llvm::fcPosNormal, llvm::fcPosSubnormal, llvm::fcPosZero, llvm::fcQNan, llvm::fcSNan, llvm::fcSubnormal, llvm::fcZero, llvm::First, Flt, llvm::KnownFPClass::fneg(), llvm::Constant::getAggregateElement(), llvm::ExtractValueInst::getAggregateOperand(), llvm::APInt::getAllOnes(), llvm::APInt::getBitWidth(), llvm::Function::getDenormalMode(), llvm::Type::getFltSemantics(), llvm::DenormalMode::getIEEE(), llvm::ExtractValueInst::getIndices(), llvm::APFloat::getInf(), llvm::Type::getIntegerBitWidth(), llvm::APFloat::getLargest(), llvm::APInt::getOneBitSet(), llvm::Type::getScalarSizeInBits(), llvm::Type::getScalarType(), llvm::getShuffleDemandedElts(), llvm::ConstantRange::getSignedMin(), llvm::ConstantRange::getSingleElement(), llvm::Value::getType(), llvm::SimplifyQuery::getWithInstruction(), llvm::SimplifyQuery::getWithoutCondContext(), llvm::APFloat::getZero(), llvm::InstrInfoQuery::hasNoSignedZeros(), Idx, llvm::DenormalMode::IEEE, II, llvm::SimplifyQuery::IIQ, llvm::DenormalMode::Input, llvm::DenormalMode::inputsAreZero(), llvm::ConstantRange::isAllNegative(), llvm::ConstantRange::isAllNonNegative(), llvm::Type::isIEEE(), llvm::KnownFPClass::isKnownNever(), llvm::KnownFPClass::isKnownNeverInfinity(), llvm::KnownFPClass::isKnownNeverLogicalNegZero(), llvm::KnownFPClass::isKnownNeverLogicalPosZero(), llvm::KnownFPClass::isKnownNeverLogicalZero(), llvm::KnownFPClass::isKnownNeverNaN(), llvm::KnownFPClass::isKnownNeverNegInfinity(), llvm::KnownFPClass::isKnownNeverNegSubnormal(), llvm::KnownFPClass::isKnownNeverNegZero(), llvm::KnownFPClass::isKnownNeverPosInfinity(), llvm::KnownFPClass::isKnownNeverPosSubnormal(), llvm::KnownFPClass::isKnownNeverPosZero(), llvm::KnownFPClass::isKnownNeverSubnormal(), llvm::APFloat::isNaN(), llvm::APFloatBase::isRepresentableAsNormalIn(), llvm::KnownFPClass::isUnknown(), llvm::APInt::isZero(), llvm::KnownFPClass::KnownFPClasses, llvm::KnownFPClass::knownNot(), LHS, llvm::PatternMatch::m_ConstantInt(), llvm::PatternMatch::m_ElementWiseBitCast(), llvm::PatternMatch::m_FCmp(), llvm::PatternMatch::m_Select(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_Value(), llvm::make_scope_exit(), llvm::KnownBits::makeConstant(), llvm::PatternMatch::match(), llvm::MaxAnalysisRecursionDepth, llvm::KnownFPClass::OrderedGreaterThanZeroMask, llvm::KnownFPClass::OrderedLessThanZeroMask, llvm::DenormalMode::Output, outputDenormalIsIEEEOrPosZero(), llvm::DenormalMode::outputsAreZero(), P, llvm::DenormalMode::PositiveZero, llvm::KnownFPClass::propagateCanonicalizingSrc(), llvm::KnownFPClass::propagateNaN(), llvm::KnownFPClass::resetAll(), llvm::APInt::reverseBits(), RHS, llvm::APFloatBase::semanticsPrecision(), llvm::APInt::sge(), llvm::KnownFPClass::SignBit, llvm::KnownFPClass::signBitMustBeOne(), llvm::KnownFPClass::signBitMustBeZero(), llvm::ArrayRef< T >::size(), llvm::InstrInfoQuery::UseInstrInfo, and llvm::KnownBits::Zero.

Referenced by computeKnownBitsFromOperator().

computeKnownFPClass() [2/2]

static void computeKnownFPClass ( const Value *  V, KnownFPClass &  Known, FPClassTest  InterestedClasses, unsigned  Depth, const SimplifyQuery &  Q  )

static

Definition at line 5001 of file ValueTracking.cpp.

References llvm::computeKnownFPClass(), llvm::Depth, and llvm::APInt::getAllOnes().

computeKnownFPClassForFPTrunc()

static void computeKnownFPClassForFPTrunc ( const Operator *  Op, const APInt &  DemandedElts, FPClassTest  InterestedClasses, KnownFPClass &  Known, unsigned  Depth, const SimplifyQuery &  Q  )

static

Definition at line 5010 of file ValueTracking.cpp.

References llvm::KnownFPClass::cannotBeOrderedLessThanZero(), llvm::computeKnownFPClass(), llvm::Depth, llvm::fcNan, llvm::fcNone, llvm::KnownFPClass::knownNot(), llvm::KnownFPClass::OrderedLessThanZeroMask, and llvm::KnownFPClass::propagateNaN().

Referenced by computeKnownFPClass().

computeKnownFPClassFromCond()

static void computeKnownFPClassFromCond ( const Value *  V, Value *  Cond, unsigned  Depth, bool  CondIsTrue, const Instruction *  CxtI, KnownFPClass &  KnownFromContext  )

static

Definition at line 4908 of file ValueTracking.cpp.

References A, B, computeKnownFPClassFromCond(), Cond, llvm::Depth, llvm::fcmpImpliesClass(), llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent(), llvm::isSignBitCheck(), llvm::KnownFPClass::knownNot(), LHS, llvm::PatternMatch::m_APFloat(), llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_ConstantInt(), llvm::PatternMatch::m_ElementWiseBitCast(), llvm::PatternMatch::m_FCmp(), llvm::PatternMatch::m_ICmp(), llvm::PatternMatch::m_LogicalAnd(), llvm::PatternMatch::m_LogicalOr(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), llvm::MaxAnalysisRecursionDepth, RHS, llvm::KnownFPClass::signBitMustBeOne(), and llvm::KnownFPClass::signBitMustBeZero().

Referenced by computeKnownFPClassFromCond(), and computeKnownFPClassFromContext().

computeKnownFPClassFromContext()

static KnownFPClass computeKnownFPClassFromContext ( const Value *  V, const SimplifyQuery &  Q  )

static

Definition at line 4948 of file ValueTracking.cpp.

References llvm::SimplifyQuery::AC, assert(), llvm::AssumptionCache::assumptionsFor(), computeKnownFPClassFromCond(), Cond, llvm::DomConditionCache::conditionsFor(), llvm::SimplifyQuery::CxtI, llvm::SimplifyQuery::DC, llvm::DominatorTree::dominates(), llvm::SimplifyQuery::DT, llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent(), I, and llvm::isValidAssumeForContext().

Referenced by computeKnownFPClass().

ComputeNumSignBits() [1/2]

static unsigned ComputeNumSignBits ( const Value *  V, const APInt &  DemandedElts, unsigned  Depth, const SimplifyQuery &  Q  )

static

Definition at line 3858 of file ValueTracking.cpp.

References assert(), ComputeNumSignBitsImpl(), and llvm::Depth.

Referenced by llvm::ComputeMaxSignificantBits(), ComputeNumSignBits(), and ComputeNumSignBitsImpl().

ComputeNumSignBits() [2/2]

static unsigned ComputeNumSignBits ( const Value *  V, unsigned  Depth, const SimplifyQuery &  Q  )

static

Definition at line 343 of file ValueTracking.cpp.

References ComputeNumSignBits(), llvm::Depth, and llvm::APInt::getAllOnes().

ComputeNumSignBitsImpl()

static unsigned ComputeNumSignBitsImpl ( const Value *  V, const APInt &  DemandedElts, unsigned  Depth, const SimplifyQuery &  Q  )

static

Return the number of times the sign bit of the register is replicated into the other bits.

We know that at least 1 bit is always equal to the sign bit (itself), but other cases can give us information. For example, immediately after an "ashr X, 2", we know that the top 3 bits are all equal to each other, so we return 3. For vectors, return the number of sign bits for the vector element with the minimum number of known sign bits of the demanded elements in the vector specified by DemandedElts.

Definition at line 3872 of file ValueTracking.cpp.

References assert(), llvm::APInt::ceilLogBase2(), computeKnownBits(), ComputeNumSignBits(), computeNumSignBitsVectorConstant(), llvm::KnownBits::countMinSignBits(), llvm::SimplifyQuery::CxtI, llvm::Depth, llvm::SimplifyQuery::DL, llvm::APInt::getBitWidth(), llvm::PHINode::getIncomingBlock(), llvm::PHINode::getIncomingValue(), llvm::PHINode::getNumIncomingValues(), llvm::APInt::getNumSignBits(), llvm::Operator::getOpcode(), llvm::DataLayout::getPointerTypeSizeInBits(), llvm::Type::getScalarType(), getShuffleDemandedElts(), llvm::BasicBlock::getTerminator(), llvm::DataLayout::getTypeSizeInBits(), llvm::SimplifyQuery::getWithoutCondContext(), llvm::APInt::getZExtValue(), II, llvm::KnownBits::isNonNegative(), llvm::Type::isPointerTy(), isSignedMinMaxClamp(), isSignedMinMaxIntrinsicClamp(), llvm::APInt::isStrictlyPositive(), LHS, llvm::APInt::logBase2(), llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::m_ZExt(), llvm::PatternMatch::match(), llvm::MaxAnalysisRecursionDepth, RHS, llvm::APInt::uge(), X, and llvm::KnownBits::Zero.

Referenced by ComputeNumSignBits().

computeNumSignBitsVectorConstant()

static unsigned computeNumSignBitsVectorConstant ( const Value *  V, const APInt &  DemandedElts, unsigned  TyBits  )

static

For vector constants, loop over the elements and find the constant with the minimum number of sign bits.

Return 0 if the value is not a vector constant or if any element was not analyzed; otherwise, return the count for the element with the minimum number of sign bits.

Definition at line 3831 of file ValueTracking.cpp.

Referenced by ComputeNumSignBitsImpl().

computeOverflowForSignedAdd()

static OverflowResult computeOverflowForSignedAdd ( const WithCache< const Value * > &  LHS, const WithCache< const Value * > &  RHS, const AddOperator *  Add, const SimplifyQuery &  SQ  )

static

Definition at line 7260 of file ValueTracking.cpp.

References llvm::Add, llvm::computeConstantRangeIncludingKnownBits(), llvm::computeKnownBitsFromContext(), llvm::ComputeNumSignBits(), llvm::ConstantRange::getBitWidth(), llvm::ConstantRange::isAllNegative(), llvm::ConstantRange::isAllNonNegative(), llvm::KnownBits::isNegative(), llvm::KnownBits::isNonNegative(), LHS, mapOverflowResult(), llvm::MayOverflow, llvm::NeverOverflows, RHS, and llvm::ConstantRange::signedAddMayOverflow().

directlyImpliesPoison()

static bool directlyImpliesPoison ( const Value *  ValAssumedPoison, const Value *  V, unsigned  Depth  )

static

Definition at line 7634 of file ValueTracking.cpp.

References llvm::any_of(), llvm::Depth, I, II, llvm::is_contained(), llvm::PatternMatch::m_ExtractValue(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_WithOverflowInst(), and llvm::PatternMatch::match().

Referenced by impliesPoison().

exactClass()

static std::tuple< Value *, FPClassTest, FPClassTest > exactClass ( Value *  V, FPClassTest  M  )

static

Return the return value for fcmpImpliesClass for a compare that produces an exact class test.

Definition at line 4519 of file ValueTracking.cpp.

Referenced by llvm::fcmpImpliesClass().

getBitWidth()

static unsigned getBitWidth ( Type *  Ty, const DataLayout &  DL  )

static

Returns the bitwidth of the given scalar or pointer type.

For vector types, returns the element type's bitwidth.

Definition at line 93 of file ValueTracking.cpp.

References llvm::BitWidth, DL, and llvm::Type::getScalarSizeInBits().

Referenced by canConvertValue(), llvm::FunctionComparator::cmpTypes(), combineAnd(), combineOr(), llvm::computeKnownBits(), llvm::APInt::concat(), llvm::ConstantRangeList::ConstantRangeList(), DecodeFixedType(), llvm::AMDGPULibFuncBase::Param::getFromTy(), getMangledTypeStr(), getTargetConstantBitsFromNode(), getTypeID(), llvm::MVT::getVT(), llvm::X86TTIImpl::hasConditionalLoadStoreForType(), instCombineSVECondLast(), isKnownNonZeroFromOperator(), LLVMCreateGenericValueOfInt(), llvm::ExecutionEngine::LoadValueFromMemory(), llvm::APInt::operator[](), and llvm::InstCombinerImpl::SimplifyDemandedInstructionBits().

getDomPredecessorCondition()

static std::pair< Value *, bool > getDomPredecessorCondition ( const Instruction *  ContextI )

static

Definition at line 9645 of file ValueTracking.cpp.

References assert(), llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent(), llvm::BasicBlock::getSinglePredecessor(), llvm::BasicBlock::getTerminator(), llvm::PatternMatch::m_Br(), llvm::PatternMatch::m_Value(), and llvm::PatternMatch::match().

Referenced by llvm::isImpliedByDomCondition().

getInvertibleOperands()

static std::optional< std::pair< Value *, Value * > > getInvertibleOperands ( const Operator *  Op1, const Operator *  Op2  )

static

If the pair of operators are the same invertible function, return the the operands of the function corresponding to each input.

Otherwise, return std::nullopt. An invertible function is one that is 1-to-1 and maps every input value to exactly one output value. This is equivalent to saying that Op1 and Op2 are equal exactly when the specified pair of operands are equal, (except that Op1 and Op2 may be poison more often.)

Definition at line 3478 of file ValueTracking.cpp.

References getInvertibleOperands(), llvm::Operator::getOpcode(), llvm::User::getOperand(), getOperands(), llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent(), llvm::Value::getType(), llvm::PatternMatch::m_c_BinOp(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), llvm::matchSimpleRecurrence(), and Other.

Referenced by getInvertibleOperands(), and isKnownNonEqual().

getKnownBitsFromAndXorOr()

static KnownBits getKnownBitsFromAndXorOr ( const Operator *  I, const APInt &  DemandedElts, const KnownBits &  KnownLHS, const KnownBits &  KnownRHS, unsigned  Depth, const SimplifyQuery &  Q  )

static

Definition at line 918 of file ValueTracking.cpp.

References llvm::BitWidth, llvm::KnownBits::blsi(), llvm::KnownBits::blsmsk(), computeKnownBits(), llvm::KnownBits::countMaxTrailingZeros(), llvm::KnownBits::countMinTrailingOnes(), llvm::Depth, llvm::KnownBits::getBitWidth(), I, llvm::APInt::isZero(), llvm_unreachable, llvm::PatternMatch::m_Add(), llvm::PatternMatch::m_AllOnes(), llvm::PatternMatch::m_c_Add(), llvm::PatternMatch::m_c_And(), llvm::PatternMatch::m_c_BinOp(), llvm::PatternMatch::m_c_Xor(), llvm::PatternMatch::m_Deferred(), llvm::PatternMatch::m_Neg(), llvm::PatternMatch::m_Sub(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), llvm::KnownBits::One, llvm::APInt::setBit(), X, Y, and llvm::KnownBits::Zero.

Referenced by llvm::analyzeKnownBitsFromAndXorOr(), and computeKnownBitsFromOperator().

getNotValue()

static Value * getNotValue ( Value *  V )

static

If the input value is the result of a 'not' op, constant integer, or vector splat of a constant integer, return the bitwise-not source value.

TODO: This could be extended to handle non-splat vector integer constants.

Definition at line 8482 of file ValueTracking.cpp.

References llvm::CallingConv::C, llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_Not(), llvm::PatternMatch::m_Value(), and llvm::PatternMatch::match().

Referenced by matchMinMax().

getRangeForIntrinsic()

static ConstantRange getRangeForIntrinsic ( const IntrinsicInst &  II, bool  UseInstrInfo  )

static

Definition at line 9890 of file ValueTracking.cpp.

References llvm::CallingConv::C, llvm::APInt::getAllOnes(), llvm::APInt::getMaxValue(), llvm::ConstantRange::getNonEmpty(), llvm::APInt::getSignedMaxValue(), llvm::APInt::getSignedMinValue(), llvm::getVScaleRange(), llvm::APInt::getZero(), II, llvm_unreachable, llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_One(), llvm::PatternMatch::match(), and llvm::Upper.

Referenced by llvm::computeConstantRange().

getRangeForSelectPattern()

static ConstantRange getRangeForSelectPattern ( const SelectInst &  SI, const InstrInfoQuery &  IIQ  )

static

Definition at line 10007 of file ValueTracking.cpp.

References llvm::BitWidth, llvm::CallingConv::C, llvm::ConstantRange::getNonEmpty(), llvm::APInt::getSignedMaxValue(), llvm::APInt::getSignedMinValue(), llvm::APInt::getZero(), llvm::InstrInfoQuery::hasNoSignedWrap(), LHS, llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_Neg(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::match(), llvm::matchSelectPattern(), RHS, llvm::SPF_ABS, llvm::SPF_NABS, llvm::SPF_SMAX, llvm::SPF_SMIN, llvm::SPF_UMAX, llvm::SPF_UMIN, and llvm::SPF_UNKNOWN.

Referenced by llvm::computeConstantRange().

getShuffleDemandedElts()

static bool getShuffleDemandedElts ( const ShuffleVectorInst *  Shuf, const APInt &  DemandedElts, APInt &  DemandedLHS, APInt &  DemandedRHS  )

static

Definition at line 134 of file ValueTracking.cpp.

References assert(), llvm::User::getOperand(), llvm::getShuffleDemandedElts(), llvm::ShuffleVectorInst::getShuffleMask(), llvm::ShuffleVectorInst::getType(), and llvm::Value::getType().

Referenced by computeKnownBitsFromOperator(), ComputeNumSignBitsImpl(), and isKnownNonZeroFromOperator().

GetStringLengthH()

static uint64_t GetStringLengthH ( const Value *  V, SmallPtrSetImpl< const PHINode * > &  PHIs, unsigned  CharSize  )

static

If we can compute the length of the string pointed to by the specified pointer, return 'len+1'.

If we can't, return 0.

Definition at line 6615 of file ValueTracking.cpp.

References llvm::ConstantDataArraySlice::Array, llvm::getConstantDataArrayInfo(), llvm::ConstantDataSequential::getElementAsInteger(), GetStringLengthH(), llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::ConstantDataArraySlice::Length, and llvm::ConstantDataArraySlice::Offset.

Referenced by llvm::GetStringLength(), and GetStringLengthH().

getUnderlyingObjectFromInt()

static const Value * getUnderlyingObjectFromInt ( const Value *  V )

static

This is the function that does the work of looking through basic ptrtoint+arithmetic+inttoptr sequences.

Definition at line 6894 of file ValueTracking.cpp.

References assert(), and llvm::Operator::getOpcode().

Referenced by llvm::getUnderlyingObjectsForCodeGen().

handleGuaranteedNonPoisonOps()

template<typename CallableT >

static bool handleGuaranteedNonPoisonOps ( const Instruction *  I, const CallableT &  Handle  )

static

Enumerates all operands of I that are guaranteed to not be poison.

Definition at line 8120 of file ValueTracking.cpp.

References handleGuaranteedWellDefinedOps(), and I.

Referenced by llvm::getGuaranteedNonPoisonOps(), and llvm::mustTriggerUB().

handleGuaranteedWellDefinedOps()

template<typename CallableT >

static bool handleGuaranteedWellDefinedOps ( const Instruction *  I, const CallableT &  Handle  )

static

Enumerates all operands of I that are guaranteed to not be undef or poison.

If the callback Handle returns true, stop processing and return true. Otherwise, return false.

Definition at line 8050 of file ValueTracking.cpp.

References llvm::CallBase::arg_size(), llvm::CallBase::getArgOperand(), llvm::CallBase::getCalledOperand(), llvm::getPointerOperand(), I, llvm::CallBase::isIndirectCall(), and llvm::CallBase::paramHasAttr().

Referenced by llvm::getGuaranteedWellDefinedOps(), handleGuaranteedNonPoisonOps(), and programUndefinedIfUndefOrPoison().

haveNoCommonBitsSetSpecialCases()

static bool haveNoCommonBitsSetSpecialCases ( const Value *  LHS, const Value *  RHS, const SimplifyQuery &  SQ  )

static

Definition at line 190 of file ValueTracking.cpp.

References A, llvm::SimplifyQuery::AC, B, llvm::SimplifyQuery::CxtI, llvm::SimplifyQuery::DT, llvm::Type::getScalarSizeInBits(), llvm::Value::getType(), llvm::isGuaranteedNotToBeUndef(), LHS, llvm::PatternMatch::m_And(), llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_c_And(), llvm::PatternMatch::m_c_Or(), llvm::PatternMatch::m_c_Xor(), llvm::PatternMatch::m_Deferred(), llvm::PatternMatch::m_LShr(), llvm::PatternMatch::m_Not(), llvm::PatternMatch::m_Shl(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_Sub(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::m_ZExtOrSExt(), llvm::PatternMatch::match(), RHS, and Y.

Referenced by llvm::haveNoCommonBitsSet().

impliesPoison()

static bool impliesPoison ( const Value *  ValAssumedPoison, const Value *  V, unsigned  Depth  )

static

Definition at line 7662 of file ValueTracking.cpp.

References llvm::all_of(), llvm::canCreatePoison(), llvm::Depth, directlyImpliesPoison(), I, and llvm::isGuaranteedNotToBePoison().

includesPoison()

static bool includesPoison ( UndefPoisonKind  Kind )

static

Definition at line 7461 of file ValueTracking.cpp.

Referenced by canCreateUndefOrPoison(), and isGuaranteedNotToBeUndefOrPoison().

includesUndef()

static bool includesUndef ( UndefPoisonKind  Kind )

static

Definition at line 7465 of file ValueTracking.cpp.

Referenced by isGuaranteedNotToBeUndefOrPoison().

inputDenormalIsIEEE()

static bool inputDenormalIsIEEE ( const Function &  F, const Type *  Ty  )

static

Return true if it's possible to assume IEEE treatment of input denormals in F for Val.

Definition at line 4364 of file ValueTracking.cpp.

References F, llvm::Type::getFltSemantics(), llvm::Type::getScalarType(), and llvm::DenormalMode::IEEE.

Referenced by llvm::fcmpImpliesClass(), fpclassTestIsFCmp0(), and llvm::KnownFPClass::isKnownNeverLogicalZero().

inputDenormalIsIEEEOrPosZero()

static bool inputDenormalIsIEEEOrPosZero ( const Function &  F, const Type *  Ty  )

static

Definition at line 4369 of file ValueTracking.cpp.

References F, llvm::Type::getFltSemantics(), llvm::Type::getScalarType(), llvm::DenormalMode::IEEE, and llvm::DenormalMode::PositiveZero.

Referenced by llvm::KnownFPClass::isKnownNeverLogicalNegZero().

isEphemeralValueOf()

static bool isEphemeralValueOf ( const Instruction *  I, const Value *  E  )

static

Definition at line 465 of file ValueTracking.cpp.

References llvm::all_of(), llvm::append_range(), llvm::SmallVectorBase< Size_T >::empty(), I, llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::is_contained(), mayHaveSideEffects(), and llvm::SmallVectorImpl< T >::pop_back_val().

Referenced by llvm::isValidAssumeForContext().

isGEPKnownNonNull()

static bool isGEPKnownNonNull ( const GEPOperator *  GEP, unsigned  Depth, const SimplifyQuery &  Q  )

static

Test whether a GEP's result is known to be non-null.

Uses properties inherent in a GEP to try to determine whether it is known to be non-null.

Currently this routine does not support vector GEPs.

Definition at line 2551 of file ValueTracking.cpp.

References assert(), llvm::Depth, llvm::SimplifyQuery::DL, F, GEP, llvm::gep_type_begin(), llvm::gep_type_end(), llvm::StructLayout::getElementOffset(), llvm::DataLayout::getStructLayout(), llvm::ConstantInt::getZExtValue(), I, isKnownNonZero(), llvm::MaxAnalysisRecursionDepth, and llvm::NullPointerIsDefined().

Referenced by isKnownNonZeroFromOperator().

isGuaranteedNotToBeUndefOrPoison()

static bool isGuaranteedNotToBeUndefOrPoison ( const Value *  V, AssumptionCache *  AC, const Instruction *  CtxI, const DominatorTree *  DT, unsigned  Depth, UndefPoisonKind  Kind  )

static

Definition at line 7689 of file ValueTracking.cpp.

References A, llvm::all_of(), llvm::any_of(), llvm::CallingConv::C, llvm::canCreateUndefOrPoison(), Cond, llvm::Depth, llvm::DomTreeNodeBase< NodeT >::getBlock(), llvm::DomTreeNodeBase< NodeT >::getIDom(), llvm::getKnowledgeValidInContext(), llvm::DominatorTreeBase< NodeT, IsPostDom >::getNode(), llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent(), I, includesPoison(), includesUndef(), llvm::isGuaranteedNotToBeUndefOrPoison(), llvm::MaxAnalysisRecursionDepth, and llvm::programUndefinedIfUndefOrPoison().

isImpliedCondAndOr()

static std::optional< bool > isImpliedCondAndOr ( const Instruction *  LHS, CmpPredicate  RHSPred, const Value *  RHSOp0, const Value *  RHSOp1, const DataLayout &  DL, bool  LHSIsTrue, unsigned  Depth  )

static

Return true if LHS implies RHS is true.

Return false if LHS implies RHS is false. Otherwise, return std::nullopt if we can't infer anything. We expect the RHS to be an icmp and the LHS to be an 'and', 'or', or a 'select' instruction.

Definition at line 9522 of file ValueTracking.cpp.

References assert(), llvm::Depth, DL, llvm::isImpliedCondition(), LHS, llvm::PatternMatch::m_LogicalAnd(), llvm::PatternMatch::m_LogicalOr(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), and llvm::MaxAnalysisRecursionDepth.

Referenced by llvm::isImpliedCondition().

isImpliedCondCommonOperandWithCR()

static std::optional< bool > isImpliedCondCommonOperandWithCR ( CmpPredicate  LPred, const ConstantRange &  LCR, CmpPredicate  RPred, const ConstantRange &  RCR  )

static

Return true if "icmp LPred X, LCR" implies "icmp RPred X, RCR" is true.

Return false if "icmp LPred X, LCR" implies "icmp RPred X, RCR" is false. Otherwise, return std::nullopt if we can't infer anything.

Definition at line 9391 of file ValueTracking.cpp.

References llvm::ICmpInst::getFlippedSignednessPredicate(), llvm::CmpInst::getInversePredicate(), llvm::CmpPredicate::hasSameSign(), llvm::ConstantRange::icmp(), and llvm::ConstantRange::makeAllowedICmpRegion().

Referenced by isImpliedCondICmps().

isImpliedCondICmps()

static std::optional< bool > isImpliedCondICmps ( const ICmpInst *  LHS, CmpPredicate  RPred, const Value *  R0, const Value *  R1, const DataLayout &  DL, bool  LHSIsTrue  )

static

Return true if LHS implies RHS (expanded to its components as "R0 RPred R1") is true.

Return false if LHS implies RHS is false. Otherwise, return std::nullopt if we can't infer anything.

Definition at line 9423 of file ValueTracking.cpp.

References llvm::computeConstantRange(), llvm::CmpPredicate::getMatching(), llvm::CmpPredicate::getPreferredSignedPredicate(), llvm::ICmpInst::getSwappedCmpPredicate(), llvm::CmpInst::ICMP_SGE, llvm::CmpInst::ICMP_SGT, llvm::CmpInst::ICMP_SLE, llvm::CmpInst::ICMP_SLT, llvm::CmpInst::ICMP_UGE, llvm::CmpInst::ICMP_ULT, llvm::ICmpInst::isImpliedByMatchingCmp(), isImpliedCondCommonOperandWithCR(), isImpliedCondOperands(), llvm::CmpInst::isSigned(), LHS, llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_c_Add(), llvm::PatternMatch::m_ImmConstant(), llvm::PatternMatch::m_NonNegative(), llvm::PatternMatch::m_NonPositive(), llvm::PatternMatch::m_NSWSub(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::match(), llvm::MaxAnalysisRecursionDepth, P, and std::swap().

Referenced by llvm::isImpliedCondition().

isImpliedCondOperands()

static std::optional< bool > isImpliedCondOperands ( CmpInst::Predicate  Pred, const Value *  ALHS, const Value *  ARHS, const Value *  BLHS, const Value *  BRHS  )

static

Return true if "icmp Pred BLHS BRHS" is true whenever "icmp Pred ALHS ARHS" is true.

Otherwise, return std::nullopt.

Definition at line 9351 of file ValueTracking.cpp.

References llvm::CmpInst::ICMP_SGE, llvm::CmpInst::ICMP_SGT, llvm::CmpInst::ICMP_SLE, llvm::CmpInst::ICMP_SLT, llvm::CmpInst::ICMP_UGE, llvm::CmpInst::ICMP_UGT, llvm::CmpInst::ICMP_ULE, llvm::CmpInst::ICMP_ULT, and isTruePredicate().

Referenced by isImpliedCondICmps().

isImpliedToBeAPowerOfTwoFromCond()

static bool isImpliedToBeAPowerOfTwoFromCond ( const Value *  V, bool  OrZero, const Value *  Cond, bool  CondIsTrue  )

static

Return true if we can infer that V is known to be a power of 2 from dominating condition Cond (e.g., ctpop(V) == 1).

Definition at line 2328 of file ValueTracking.cpp.

References Cond, llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_ICmp(), llvm::PatternMatch::m_Specific(), and llvm::PatternMatch::match().

Referenced by llvm::isKnownToBeAPowerOfTwo().

isKnownNonEqual()

static bool isKnownNonEqual ( const Value *  V1, const Value *  V2, const APInt &  DemandedElts, unsigned  Depth, const SimplifyQuery &  Q  )

static

Return true if it is known that V1 != V2.

Definition at line 3754 of file ValueTracking.cpp.

References A, B, computeKnownBits(), llvm::Depth, llvm::SimplifyQuery::DL, getInvertibleOperands(), llvm::Value::getType(), llvm::APInt::intersects(), llvm::Type::isIntOrIntVectorTy(), isKnownNonEqual(), isModifyingBinopOfNonZero(), isNonEqualMul(), isNonEqualPHIs(), isNonEqualPointersWithRecursiveGEP(), isNonEqualSelect(), isNonEqualShl(), llvm::KnownBits::isUnknown(), llvm::PatternMatch::m_PtrToIntSameSize(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), llvm::MaxAnalysisRecursionDepth, llvm::KnownBits::One, and llvm::KnownBits::Zero.

Referenced by isKnownNonEqual(), isNonEqualPHIs(), and isNonEqualSelect().

isKnownNonNaN()

static bool isKnownNonNaN ( const Value *  V, FastMathFlags  FMF  )

static

Definition at line 8256 of file ValueTracking.cpp.

References llvm::CallingConv::C, I, and llvm::FastMathFlags::noNaNs().

Referenced by matchSelectPattern().

isKnownNonNullFromDominatingCondition()

static bool isKnownNonNullFromDominatingCondition ( const Value *  V, const Instruction *  CtxI, const DominatorTree *  DT  )

static

Definition at line 2615 of file ValueTracking.cpp.

References assert(), cmpExcludesZero(), DomConditionsMaxUses, llvm::DominatorTree::dominates(), llvm::SmallVectorBase< Size_T >::empty(), llvm::CmpInst::getInversePredicate(), llvm::getLoadStorePointerOperand(), llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent(), I, llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::isGuard(), llvm::BasicBlockEdge::isSingleEdge(), llvm::isValidAssumeForContext(), llvm::PatternMatch::m_c_ICmp(), llvm::PatternMatch::m_IDiv(), llvm::PatternMatch::m_IRem(), llvm::PatternMatch::m_LogicalAnd(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), llvm::NullPointerIsDefined(), llvm::SmallVectorImpl< T >::pop_back_val(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), and RHS.

Referenced by isKnownNonZero().

isKnownNonZero() [1/2]

static bool isKnownNonZero ( const Value *  V )

static

Definition at line 8279 of file ValueTracking.cpp.

References llvm::CallingConv::C, and I.

isKnownNonZero() [2/2]

bool isKnownNonZero ( const Value *  V, const APInt &  DemandedElts, const SimplifyQuery &  Q, unsigned  Depth  )

static

Return true if the given value is known to be non-zero when defined.

For vectors, return true if every demanded element is known to be non-zero when defined. For pointers, if the context instruction and dominator tree are specified, perform context-sensitive analysis and return true if the pointer couldn't possibly be null at the specified instruction. Supports values with integer or pointer type and vectors of integers.

Definition at line 3368 of file ValueTracking.cpp.

References A, assert(), llvm::CallingConv::C, llvm::ConstantRange::contains(), llvm::SimplifyQuery::CxtI, llvm::Depth, llvm::SimplifyQuery::DT, llvm::APInt::getBitWidth(), llvm::ConstantRange::getBitWidth(), I, isKnownNonNullFromDominatingCondition(), isKnownNonZero(), isKnownNonZeroFromAssume(), isKnownNonZeroFromOperator(), llvm::Constant::isNullValue(), llvm::MaxAnalysisRecursionDepth, llvm::NullPointerIsDefined(), and Range.

Referenced by computeKnownBitsFromShiftOperator(), isGEPKnownNonNull(), isKnownNonZero(), isKnownNonZeroFromOperator(), llvm::isKnownPositive(), llvm::isKnownToBeAPowerOfTwo(), isModifyingBinopOfNonZero(), isNonEqualMul(), isNonEqualShl(), isNonZeroAdd(), isNonZeroMul(), isNonZeroShift(), and isNonZeroSub().

isKnownNonZeroFromAssume()

static bool isKnownNonZeroFromAssume ( const Value *  V, const SimplifyQuery &  Q  )

static

Definition at line 595 of file ValueTracking.cpp.

References llvm::SimplifyQuery::AC, assert(), llvm::AssumptionCache::assumptionsFor(), cmpExcludesZero(), llvm::SimplifyQuery::CxtI, llvm::SimplifyQuery::DT, llvm::AssumptionCache::ExprResultIdx, llvm::Instruction::getFunction(), llvm::getKnowledgeFromBundle(), I, llvm::isValidAssumeForContext(), llvm::PatternMatch::m_c_ICmp(), llvm::PatternMatch::m_CombineOr(), llvm::PatternMatch::m_PtrToInt(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), llvm::NullPointerIsDefined(), and RHS.

Referenced by isKnownNonZero().

isKnownNonZeroFromOperator()

static bool isKnownNonZeroFromOperator ( const Operator *  I, const APInt &  DemandedElts, unsigned  Depth, const SimplifyQuery &  Q  )

static

Definition at line 2905 of file ValueTracking.cpp.

References llvm::KnownBits::abs(), llvm::SimplifyQuery::AC, llvm::all_of(), llvm::BitWidth, llvm::APInt::clearBit(), cmpExcludesZero(), computeKnownBits(), llvm::ConstantRange::contains(), llvm::SimplifyQuery::CxtI, llvm::Depth, llvm::SimplifyQuery::DL, llvm::SimplifyQuery::DT, llvm::APInt::getAllOnes(), llvm::CallBase::getArgOperand(), llvm::getArgumentAliasingToReturnedPointer(), llvm::BinaryOpIntrinsic::getBinaryOp(), llvm::APInt::getBitWidth(), llvm::ConstantRange::getBitWidth(), getBitWidth(), llvm::details::FixedOrScalableQuantity< LeafTy, ValueTy >::getFixedValue(), llvm::InstrInfoQuery::getMetadata(), llvm::APInt::getOneBitSet(), llvm::Type::getScalarType(), getShuffleDemandedElts(), llvm::Value::getType(), llvm::DataLayout::getTypeSizeInBits(), llvm::SimplifyQuery::getWithoutCondContext(), llvm::APInt::getZero(), llvm::InstrInfoQuery::hasNoSignedWrap(), llvm::InstrInfoQuery::hasNoUnsignedWrap(), I, Idx, II, llvm::SimplifyQuery::IIQ, llvm::PossiblyExactOperator::isExact(), isGEPKnownNonNull(), llvm::isGuaranteedNotToBePoison(), llvm::Type::isIntOrIntVectorTy(), isKnownNonZero(), llvm::KnownBits::isNegative(), llvm::KnownBits::isNonNegative(), llvm::KnownBits::isNonZero(), isNonZeroAdd(), isNonZeroMul(), isNonZeroRecurrence(), isNonZeroShift(), isNonZeroSub(), llvm::Type::isPtrOrPtrVectorTy(), llvm::KnownBits::isUnknown(), llvm::APInt::isZero(), llvm::PatternMatch::m_c_ICmp(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::m_WithOverflowInst(), llvm::PatternMatch::match(), matchOpWithOpEqZero(), llvm::MaxAnalysisRecursionDepth, llvm::NullPointerIsDefined(), llvm::KnownBits::One, Range, rangeMetadataExcludesValue(), llvm::APInt::reverseBits(), llvm::KnownBits::uge(), llvm::InstrInfoQuery::UseInstrInfo, and X.

Referenced by isKnownNonZero().

isModifyingBinopOfNonZero()

static bool isModifyingBinopOfNonZero ( const Value *  V1, const Value *  V2, const APInt &  DemandedElts, unsigned  Depth, const SimplifyQuery &  Q  )

static

Return true if V1 == (binop V2, X), where X is known non-zero.

Only handle a small subset of binops where (binop V2, X) with non-zero X implies V2 != V1.

Definition at line 3594 of file ValueTracking.cpp.

References llvm::Depth, llvm::BinaryOperator::getOpcode(), llvm::User::getOperand(), and isKnownNonZero().

Referenced by isKnownNonEqual().

isNonEqualMul()

static bool isNonEqualMul ( const Value *  V1, const Value *  V2, const APInt &  DemandedElts, unsigned  Depth, const SimplifyQuery &  Q  )

static

Return true if V2 == V1 * C, where V1 is known non-zero, C is not 0/1 and the multiplication is nuw or nsw.

Definition at line 3623 of file ValueTracking.cpp.

References llvm::CallingConv::C, llvm::Depth, isKnownNonZero(), llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_Mul(), llvm::PatternMatch::m_Specific(), and llvm::PatternMatch::match().

Referenced by isKnownNonEqual().

isNonEqualPHIs()

static bool isNonEqualPHIs ( const PHINode *  PN1, const PHINode *  PN2, const APInt &  DemandedElts, unsigned  Depth, const SimplifyQuery &  Q  )

static

Definition at line 3650 of file ValueTracking.cpp.

References llvm::PHINode::blocks(), llvm::SimplifyQuery::CxtI, llvm::Depth, llvm::PHINode::getIncomingValueForBlock(), llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent(), llvm::SimplifyQuery::getWithoutCondContext(), llvm::SmallPtrSetImpl< PtrType >::insert(), isKnownNonEqual(), llvm::PatternMatch::m_APInt(), and llvm::PatternMatch::match().

Referenced by isKnownNonEqual().

isNonEqualPointersWithRecursiveGEP()

static bool isNonEqualPointersWithRecursiveGEP ( const Value *  A, const Value *  B, const SimplifyQuery &  Q  )

static

Definition at line 3706 of file ValueTracking.cpp.

References A, B, llvm::SimplifyQuery::DL, llvm::DataLayout::getIndexTypeSizeInBits(), llvm::APInt::isNegative(), llvm::APInt::isStrictlyPositive(), llvm::APInt::sge(), llvm::APInt::sle(), and llvm::Value::stripAndAccumulateInBoundsConstantOffsets().

Referenced by isKnownNonEqual().

isNonEqualSelect()

static bool isNonEqualSelect ( const Value *  V1, const Value *  V2, const APInt &  DemandedElts, unsigned  Depth, const SimplifyQuery &  Q  )

static

Definition at line 3681 of file ValueTracking.cpp.

References llvm::Depth, llvm::SelectInst::getCondition(), llvm::SelectInst::getFalseValue(), llvm::SelectInst::getTrueValue(), and isKnownNonEqual().

Referenced by isKnownNonEqual().

isNonEqualShl()

static bool isNonEqualShl ( const Value *  V1, const Value *  V2, const APInt &  DemandedElts, unsigned  Depth, const SimplifyQuery &  Q  )

static

Return true if V2 == V1 << C, where V1 is known non-zero, C is not 0 and the shift is nuw or nsw.

Definition at line 3638 of file ValueTracking.cpp.

References llvm::CallingConv::C, llvm::Depth, isKnownNonZero(), llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_Shl(), llvm::PatternMatch::m_Specific(), and llvm::PatternMatch::match().

Referenced by isKnownNonEqual().

isNonZeroAdd()

static bool isNonZeroAdd ( const APInt &  DemandedElts, unsigned  Depth, const SimplifyQuery &  Q, unsigned  BitWidth, Value *  X, Value *  Y, bool  NSW, bool  NUW  )

static

Definition at line 2764 of file ValueTracking.cpp.

References llvm::KnownBits::add(), llvm::BitWidth, computeKnownBits(), llvm::Depth, llvm::APInt::getSignedMaxValue(), llvm::APInt::intersects(), isKnownNonZero(), llvm::isKnownToBeAPowerOfTwo(), llvm::KnownBits::isNegative(), llvm::KnownBits::isNonNegative(), llvm::KnownBits::isNonZero(), matchOpWithOpEqZero(), llvm::KnownBits::One, X, and Y.

Referenced by isKnownNonZeroFromOperator().

isNonZeroMul()

static bool isNonZeroMul ( const APInt &  DemandedElts, unsigned  Depth, const SimplifyQuery &  Q, unsigned  BitWidth, Value *  X, Value *  Y, bool  NSW, bool  NUW  )

static

Definition at line 2826 of file ValueTracking.cpp.

References llvm::BitWidth, computeKnownBits(), llvm::KnownBits::countMaxTrailingZeros(), llvm::Depth, isKnownNonZero(), llvm::KnownBits::isNonZero(), llvm::KnownBits::One, X, and Y.

Referenced by isKnownNonZeroFromOperator().

isNonZeroRecurrence()

static bool isNonZeroRecurrence ( const PHINode *  PN )

static

Try to detect a recurrence that monotonically increases/decreases from a non-zero starting value.

These are common as induction variables.

Definition at line 2729 of file ValueTracking.cpp.

References llvm::BinaryOperator::getOpcode(), llvm::Instruction::hasNoSignedWrap(), llvm::Instruction::hasNoUnsignedWrap(), llvm::Instruction::isExact(), llvm::APInt::isNegative(), llvm::APInt::isZero(), llvm::PatternMatch::m_APInt(), llvm::PatternMatch::match(), and llvm::matchSimpleRecurrence().

Referenced by isKnownNonZeroFromOperator().

isNonZeroShift()

static bool isNonZeroShift ( const Operator *  I, const APInt &  DemandedElts, unsigned  Depth, const SimplifyQuery &  Q, const KnownBits &  KnownVal  )

static

Definition at line 2854 of file ValueTracking.cpp.

References llvm::APInt::ashr(), computeKnownBits(), llvm::Depth, llvm::APInt::getAllOnes(), llvm::KnownBits::getBitWidth(), llvm::KnownBits::getMaxValue(), I, isKnownNonZero(), llvm::KnownBits::isUnknown(), llvm_unreachable, llvm::APInt::lshr(), llvm::KnownBits::One, llvm::APInt::shl(), llvm::APInt::uge(), and llvm::KnownBits::Zero.

Referenced by isKnownNonZeroFromOperator().

isNonZeroSub()

static bool isNonZeroSub ( const APInt &  DemandedElts, unsigned  Depth, const SimplifyQuery &  Q, unsigned  BitWidth, Value *  X, Value *  Y  )

static

Definition at line 2810 of file ValueTracking.cpp.

References llvm::CallingConv::C, llvm::Depth, isKnownNonZero(), matchOpWithOpEqZero(), X, and Y.

Referenced by isKnownNonZeroFromOperator().

isPowerOfTwoRecurrence()

static bool isPowerOfTwoRecurrence ( const PHINode *  PN, bool  OrZero, unsigned  Depth, SimplifyQuery &  Q  )

static

Try to detect a recurrence that the value of the induction variable is always a power of two (or zero).

Definition at line 2271 of file ValueTracking.cpp.

References llvm::SimplifyQuery::CxtI, llvm::Depth, llvm::PHINode::getIncomingBlock(), llvm::BinaryOperator::getOpcode(), llvm::User::getOperand(), llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent(), llvm::BasicBlock::getTerminator(), llvm::InstrInfoQuery::hasNoSignedWrap(), llvm::InstrInfoQuery::hasNoUnsignedWrap(), llvm::SimplifyQuery::IIQ, llvm::InstrInfoQuery::isExact(), llvm::isKnownToBeAPowerOfTwo(), llvm::PatternMatch::m_Power2(), llvm::PatternMatch::m_SignMask(), llvm::PatternMatch::match(), llvm::matchSimpleRecurrence(), and llvm::User::operands().

Referenced by llvm::isKnownToBeAPowerOfTwo().

isSameUnderlyingObjectInLoop()

static bool isSameUnderlyingObjectInLoop ( const PHINode *  PN, const LoopInfo *  LI  )

static

PN defines a loop-variant pointer to an object.

Check if the previous iteration of the loop was referring to the same object as PN.

Definition at line 6736 of file ValueTracking.cpp.

References llvm::PHINode::getIncomingValue(), llvm::LoopInfoBase< BlockT, LoopT >::getLoopFor(), llvm::PHINode::getNumIncomingValues(), and llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent().

Referenced by llvm::getUnderlyingObjects().

isSignedMinMaxClamp()

static bool isSignedMinMaxClamp ( const Value *  Select, const Value *&  In, const APInt *&  CLow, const APInt *&  CHigh  )

static

Definition at line 1083 of file ValueTracking.cpp.

References assert(), llvm::SelectPatternResult::Flavor, llvm::getInverseMinMaxFlavor(), getOpcode(), LHS, llvm::PatternMatch::m_APInt(), llvm::PatternMatch::match(), matchSelectPattern(), RHS, Select, llvm::APInt::sle(), llvm::SPF_SMAX, llvm::SPF_SMIN, and std::swap().

Referenced by ComputeNumSignBitsImpl().

isSignedMinMaxIntrinsicClamp()

static bool isSignedMinMaxIntrinsicClamp ( const IntrinsicInst *  II, const APInt *&  CLow, const APInt *&  CHigh  )

static

Definition at line 1112 of file ValueTracking.cpp.

References assert(), llvm::getInverseMinMaxIntrinsic(), II, llvm::PatternMatch::m_APInt(), llvm::PatternMatch::match(), llvm::APInt::sle(), and std::swap().

Referenced by ComputeNumSignBitsImpl(), and unionWithMinMaxIntrinsicClamp().

isTruePredicate()

static bool isTruePredicate ( CmpInst::Predicate  Pred, const Value *  LHS, const Value *  RHS  )

static

Return true if "icmp Pred LHS RHS" is always true.

Definition at line 9269 of file ValueTracking.cpp.

References llvm::CallingConv::C, hasNoUnsignedWrap(), llvm::CmpInst::ICMP_SLE, llvm::CmpInst::ICMP_ULE, llvm::CmpInst::isTrueWhenEqual(), LHS, llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_c_Add(), llvm::PatternMatch::m_c_And(), llvm::PatternMatch::m_c_Or(), llvm::PatternMatch::m_c_SMax(), llvm::PatternMatch::m_c_SMin(), llvm::PatternMatch::m_c_UMax(), llvm::PatternMatch::m_c_UMin(), llvm::PatternMatch::m_LShr(), llvm::PatternMatch::m_NSWAdd(), llvm::PatternMatch::m_NSWAddLike(), llvm::PatternMatch::m_NUWAddLike(), llvm::PatternMatch::m_Or(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_UDiv(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), RHS, llvm::APInt::sle(), llvm::APInt::ule(), and X.

Referenced by isImpliedCondOperands().

lookThroughCast()

static Value * lookThroughCast ( CmpInst *  CmpI, Value *  V1, Value *  V2, Instruction::CastOps *  CastOp  )

static

Helps to match a select pattern in case of a type mismatch.

The function processes the case when type of true and false values of a select instruction differs from type of the cmp instruction operands because of a cast instruction. The function checks if it is legal to move the cast operation after "select". If yes, it returns the new second value of "select" (with the assumption that cast is moved):

1. As operand of cast instruction when both values of "select" are same cast instructions.
2. As restored constant (by applying reverse cast operation) when the first value of the "select" is a cast operation and the second value is a constant. It is implemented in lookThroughCastConst().
3. As one operand is cast instruction and the other is not. The operands in sel(cmp) are in different type integer. NOTE: We return only the new second value because the first value could be accessed as operand of cast instruction.

Definition at line 8999 of file ValueTracking.cpp.

References assert(), llvm::CallingConv::C, llvm::User::getOperand(), lookThroughCastConst(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_ZExtOrSExt(), and llvm::PatternMatch::match().

Referenced by llvm::matchDecomposedSelectPattern().

lookThroughCastConst()

static Value * lookThroughCastConst ( CmpInst *  CmpI, Type *  SrcTy, Constant *  C, Instruction::CastOps *  CastOp  )

static

Definition at line 8904 of file ValueTracking.cpp.

References llvm::CallingConv::C, llvm::ConstantFoldCastOperand(), DL, llvm::Instruction::getDataLayout(), llvm::User::getOperand(), llvm::ConstantExpr::getTrunc(), llvm::Value::getType(), llvm::CmpInst::isSigned(), llvm::CmpInst::isUnsigned(), llvm::PatternMatch::m_Constant(), and llvm::PatternMatch::match().

Referenced by lookThroughCast().

mapOverflowResult()

static OverflowResult mapOverflowResult ( ConstantRange::OverflowResult  OR )

static

Convert ConstantRange OverflowResult into ValueTracking OverflowResult.

Definition at line 7166 of file ValueTracking.cpp.

References llvm::AlwaysOverflowsHigh, llvm::ConstantRange::AlwaysOverflowsHigh, llvm::AlwaysOverflowsLow, llvm::ConstantRange::AlwaysOverflowsLow, llvm_unreachable, llvm::MayOverflow, llvm::ConstantRange::MayOverflow, llvm::NeverOverflows, and llvm::ConstantRange::NeverOverflows.

Referenced by computeOverflowForSignedAdd(), llvm::computeOverflowForSignedSub(), llvm::SelectionDAG::computeOverflowForSignedSub(), llvm::computeOverflowForUnsignedAdd(), llvm::SelectionDAG::computeOverflowForUnsignedAdd(), llvm::computeOverflowForUnsignedMul(), llvm::SelectionDAG::computeOverflowForUnsignedMul(), llvm::computeOverflowForUnsignedSub(), and llvm::SelectionDAG::computeOverflowForUnsignedSub().

matchClamp()

static SelectPatternResult matchClamp ( CmpInst::Predicate  Pred, Value *  CmpLHS, Value *  CmpRHS, Value *  TrueVal, Value *  FalseVal  )

static

Recognize variations of: CLAMP(v,l,h) ==> ((v) < (l) ? (l) : ((v) > (h) ? (h) : (v)))

Definition at line 8350 of file ValueTracking.cpp.

References llvm::CmpInst::getSwappedPredicate(), llvm::CmpInst::ICMP_SGT, llvm::CmpInst::ICMP_SLT, llvm::CmpInst::ICMP_UGT, llvm::CmpInst::ICMP_ULT, llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_SMax(), llvm::PatternMatch::m_SMin(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_UMax(), llvm::PatternMatch::m_UMin(), llvm::PatternMatch::match(), llvm::APInt::sgt(), llvm::APInt::slt(), llvm::SPF_SMAX, llvm::SPF_SMIN, llvm::SPF_UMAX, llvm::SPF_UMIN, llvm::SPF_UNKNOWN, llvm::SPNB_NA, std::swap(), llvm::APInt::ugt(), and llvm::APInt::ult().

Referenced by matchMinMax().

matchFastFloatClamp()

static SelectPatternResult matchFastFloatClamp ( CmpInst::Predicate  Pred, Value *  CmpLHS, Value *  CmpRHS, Value *  TrueVal, Value *  FalseVal, Value *&  LHS, Value *&  RHS  )

static

Match clamp pattern for float types without care about NaNs or signed zeros.

Given non-min/max outer cmp/select from the clamp pattern this function recognizes if it can be substitued by a "canonical" min/max pattern.

Definition at line 8300 of file ValueTracking.cpp.

References llvm::CmpInst::FCMP_OGE, llvm::CmpInst::FCMP_OGT, llvm::CmpInst::FCMP_OLE, llvm::CmpInst::FCMP_OLT, llvm::CmpInst::FCMP_UGE, llvm::CmpInst::FCMP_UGT, llvm::CmpInst::FCMP_ULE, llvm::CmpInst::FCMP_ULT, llvm::CmpInst::getInversePredicate(), llvm::APFloat::isFinite(), LHS, llvm::PatternMatch::m_APFloat(), llvm::PatternMatch::m_OrdOrUnordFMax(), llvm::PatternMatch::m_OrdOrUnordFMin(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::match(), RHS, llvm::SPF_FMAXNUM, llvm::SPF_FMINNUM, llvm::SPF_UNKNOWN, llvm::SPNB_NA, llvm::SPNB_RETURNS_ANY, and std::swap().

Referenced by matchSelectPattern().

matchMinMax()

static SelectPatternResult matchMinMax ( CmpInst::Predicate  Pred, Value *  CmpLHS, Value *  CmpRHS, Value *  TrueVal, Value *  FalseVal, Value *&  LHS, Value *&  RHS, unsigned  Depth  )

static

Match non-obvious integer minimum and maximum sequences.

Definition at line 8495 of file ValueTracking.cpp.

References llvm::Depth, llvm::SelectPatternResult::Flavor, getNotValue(), llvm::CmpInst::ICMP_SGT, llvm::CmpInst::ICMP_SLT, llvm::CmpInst::ICMP_UGT, llvm::CmpInst::ICMP_ULT, llvm::APInt::isAllOnes(), llvm::APInt::isMaxSignedValue(), llvm::APInt::isMinSignedValue(), llvm::APInt::isZero(), LHS, llvm::PatternMatch::m_APInt(), llvm::PatternMatch::match(), matchClamp(), matchMinMaxOfMinMax(), RHS, llvm::SPF_SMAX, llvm::SPF_SMIN, llvm::SPF_UMAX, llvm::SPF_UMIN, llvm::SPF_UNKNOWN, and llvm::SPNB_NA.

Referenced by matchSelectPattern().

matchMinMaxOfMinMax()

static SelectPatternResult matchMinMaxOfMinMax ( CmpInst::Predicate  Pred, Value *  CmpLHS, Value *  CmpRHS, Value *  TVal, Value *  FVal, unsigned  Depth  )

static

Recognize variations of: a < c ? min(a,b) : min(b,c) ==> min(min(a,b),min(b,c))

Definition at line 8386 of file ValueTracking.cpp.

References A, assert(), B, llvm::CallingConv::C, D, llvm::Depth, llvm::CmpInst::getSwappedPredicate(), llvm::CmpInst::ICMP_SGE, llvm::CmpInst::ICMP_SGT, llvm::CmpInst::ICMP_SLE, llvm::CmpInst::ICMP_SLT, llvm::CmpInst::ICMP_UGE, llvm::CmpInst::ICMP_UGT, llvm::CmpInst::ICMP_ULE, llvm::CmpInst::ICMP_ULT, llvm::CmpInst::isIntPredicate(), llvm::SelectPatternResult::isMinOrMax(), llvm::PatternMatch::m_Not(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::match(), llvm::matchSelectPattern(), llvm::SPF_SMAX, llvm::SPF_SMIN, llvm::SPF_UMAX, llvm::SPF_UMIN, llvm::SPF_UNKNOWN, llvm::SPNB_NA, and std::swap().

Referenced by matchMinMax().

matchOpWithOpEqZero()

static bool matchOpWithOpEqZero ( Value *  Op0, Value *  Op1  )

static

Definition at line 2757 of file ValueTracking.cpp.

References llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_SpecificICmp(), llvm::PatternMatch::m_Zero(), llvm::PatternMatch::m_ZExtOrSExt(), and llvm::PatternMatch::match().

Referenced by isKnownNonZeroFromOperator(), isNonZeroAdd(), and isNonZeroSub().

matchSelectPattern()

static SelectPatternResult matchSelectPattern ( CmpInst::Predicate  Pred, FastMathFlags  FMF, Value *  CmpLHS, Value *  CmpRHS, Value *  TrueVal, Value *  FalseVal, Value *&  LHS, Value *&  RHS, unsigned  Depth  )

static

Definition at line 8731 of file ValueTracking.cpp.

References llvm::Depth, llvm::CmpInst::FCMP_OGE, llvm::CmpInst::FCMP_OGT, llvm::CmpInst::FCMP_OLE, llvm::CmpInst::FCMP_OLT, llvm::CmpInst::FCMP_UGE, llvm::CmpInst::FCMP_UGT, llvm::CmpInst::FCMP_ULE, llvm::CmpInst::FCMP_ULT, llvm::getSelectPattern(), llvm::CmpInst::getSwappedPredicate(), llvm::CmpInst::ICMP_SGE, llvm::CmpInst::ICMP_SGT, llvm::CmpInst::ICMP_SLT, llvm::CmpInst::isFPPredicate(), llvm::CmpInst::isIntPredicate(), llvm::isKnownNegation(), isKnownNonNaN(), llvm::isKnownNonZero(), llvm::CmpInst::isOrdered(), LHS, llvm::PatternMatch::m_AllOnes(), llvm::PatternMatch::m_AnyZeroFP(), llvm::PatternMatch::m_CombineOr(), llvm::PatternMatch::m_Neg(), llvm::PatternMatch::m_One(), llvm::PatternMatch::m_SExt(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_ZeroInt(), llvm::PatternMatch::match(), matchFastFloatClamp(), matchMinMax(), llvm::FastMathFlags::noSignedZeros(), RHS, llvm::SPF_ABS, llvm::SPF_NABS, llvm::SPF_UNKNOWN, llvm::SPNB_NA, llvm::SPNB_RETURNS_ANY, llvm::SPNB_RETURNS_NAN, llvm::SPNB_RETURNS_OTHER, and std::swap().

Referenced by isSignedMinMaxClamp().

onlyUsedByLifetimeMarkersOrDroppableInstsHelper()

static bool onlyUsedByLifetimeMarkersOrDroppableInstsHelper ( const Value *  V, bool  AllowLifetime, bool  AllowDroppable  )

static

Definition at line 7001 of file ValueTracking.cpp.

References II.

Referenced by llvm::onlyUsedByLifetimeMarkers(), and llvm::onlyUsedByLifetimeMarkersOrDroppableInsts().

outputDenormalIsIEEEOrPosZero()

static bool outputDenormalIsIEEEOrPosZero ( const Function &  F, const Type *  Ty  )

static

Definition at line 4376 of file ValueTracking.cpp.

References F, llvm::Type::getFltSemantics(), llvm::Type::getScalarType(), llvm::DenormalMode::IEEE, and llvm::DenormalMode::PositiveZero.

Referenced by computeKnownFPClass().

programUndefinedIfUndefOrPoison()

static bool programUndefinedIfUndefOrPoison ( const Value *  V, bool  PoisonOnly  )

static

Definition at line 8150 of file ValueTracking.cpp.

References llvm::BasicBlock::begin(), llvm::SmallSet< T, N, C >::count(), llvm::BasicBlock::end(), End, llvm::Function::getEntryBlock(), llvm::BasicBlock::getFirstNonPHI(), llvm::ilist_node_impl< OptionsT >::getIterator(), llvm::BasicBlock::getParent(), llvm::BasicBlock::getSingleSuccessor(), handleGuaranteedWellDefinedOps(), I, llvm::SmallSet< T, N, C >::insert(), llvm::isGuaranteedToTransferExecutionToSuccessor(), llvm::make_range(), llvm::mustTriggerUB(), PoisonOnly, and llvm::propagatesPoison().

rangeMetadataExcludesValue()

static bool rangeMetadataExcludesValue ( const MDNode *  Ranges, const APInt &  Value  )

static

Does the 'Range' metadata (which must be a valid MD_range operand list) ensure that the value it's attached to is never Value? 'RangeType' is is the type of the value described by the range.

Definition at line 2712 of file ValueTracking.cpp.

References assert(), llvm::ConstantRange::contains(), llvm::Lower, Range, and llvm::Upper.

Referenced by isKnownNonZeroFromOperator().

safeCxtI() [1/2]

static const Instruction * safeCxtI ( const Value *  V, const Instruction *  CxtI  )

static

Definition at line 102 of file ValueTracking.cpp.

References llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent().

Referenced by llvm::computeKnownBits(), llvm::ComputeNumSignBits(), llvm::isKnownNonEqual(), and llvm::isKnownToBeAPowerOfTwo().

safeCxtI() [2/2]

static const Instruction * safeCxtI ( const Value *  V1, const Value *  V2, const Instruction *  CxtI  )

static

Definition at line 116 of file ValueTracking.cpp.

References llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent().

setLimitForFPToI()

static void setLimitForFPToI ( const Instruction *  I, APInt &  Lower, APInt &  Upper  )

static

Definition at line 10054 of file ValueTracking.cpp.

References llvm::BitWidth, I, llvm::Lower, and llvm::Upper.

Referenced by llvm::computeConstantRange().

setLimitsForBinOp()

static void setLimitsForBinOp ( const BinaryOperator &  BO, APInt &  Lower, APInt &  Upper, const InstrInfoQuery &  IIQ, bool  PreferSignedRange  )

static

Definition at line 9695 of file ValueTracking.cpp.

References llvm::APInt::ashr(), assert(), llvm::CallingConv::C, llvm::APInt::getAllOnes(), llvm::APInt::getBitsSetFrom(), llvm::APInt::getHighBitsSet(), llvm::APInt::getMaxValue(), llvm::APInt::getOneBitSet(), llvm::BinaryOperator::getOpcode(), llvm::User::getOperand(), llvm::APInt::getSignedMaxValue(), llvm::APInt::getSignedMinValue(), llvm::Instruction::hasNoSignedWrap(), llvm::InstrInfoQuery::hasNoSignedWrap(), llvm::InstrInfoQuery::hasNoUnsignedWrap(), llvm::InstrInfoQuery::isExact(), llvm::Lower, llvm::APInt::lshr(), llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_Neg(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::match(), llvm::APInt::sdiv(), std::swap(), llvm::APInt::udiv(), and llvm::Upper.

Referenced by llvm::computeConstantRange().

shiftAmountKnownInRange()

static bool shiftAmountKnownInRange ( const Value *  ShiftAmount )

static

Shifts return poison if shiftwidth is larger than the bitwidth.

Definition at line 7431 of file ValueTracking.cpp.

References llvm::all_of(), llvm::CallingConv::C, and llvm::SmallVectorTemplateBase< T, bool >::push_back().

Referenced by canCreateUndefOrPoison().

unionWithMinMaxIntrinsicClamp()

static void unionWithMinMaxIntrinsicClamp ( const IntrinsicInst *  II, KnownBits &  Known  )

static

Definition at line 1131 of file ValueTracking.cpp.

References llvm::ConstantRange::getNonEmpty(), II, isSignedMinMaxIntrinsicClamp(), and llvm::KnownBits::unionWith().

Referenced by computeKnownBitsFromOperator().

Variable Documentation

DomConditionsMaxUses

cl::opt< unsigned > DomConditionsMaxUses("dom-conditions-max-uses", cl::Hidden, cl::init(20)) ( "dom-conditions-max-uses"  , cl::Hidden  , cl::init(20)    )

static

Referenced by isKnownNonNullFromDominatingCondition().