#include "llvm/Analysis/ValueTracking.h"#include "llvm/ADT/APFloat.h"#include "llvm/ADT/APInt.h"#include "llvm/ADT/ArrayRef.h"#include "llvm/ADT/FloatingPointMode.h"#include "llvm/ADT/STLExtras.h"#include "llvm/ADT/ScopeExit.h"#include "llvm/ADT/SmallPtrSet.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/FloatingPointPredicateUtils.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/KnownFPClass.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 bool | getShuffleDemandedElts (const ShuffleVectorInst *Shuf, const APInt &DemandedElts, APInt &DemandedLHS, APInt &DemandedRHS) |
| static void | computeKnownBits (const Value *V, const APInt &DemandedElts, KnownBits &Known, const SimplifyQuery &Q, unsigned Depth) |
| 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, const SimplifyQuery &Q, unsigned Depth) |
| Return true if it is known that V1 != V2. | |
| static unsigned | ComputeNumSignBits (const Value *V, const APInt &DemandedElts, const SimplifyQuery &Q, unsigned Depth) |
| static unsigned | ComputeNumSignBits (const Value *V, const SimplifyQuery &Q, unsigned Depth=0) |
| static void | computeKnownBitsAddSub (bool Add, const Value *Op0, const Value *Op1, bool NSW, bool NUW, const APInt &DemandedElts, KnownBits &KnownOut, KnownBits &Known2, const SimplifyQuery &Q, unsigned Depth) |
| static void | computeKnownBitsMul (const Value *Op0, const Value *Op1, bool NSW, bool NUW, const APInt &DemandedElts, KnownBits &Known, KnownBits &Known2, const SimplifyQuery &Q, unsigned Depth) |
| static bool | isEphemeralValueOf (const Instruction *I, const Value *E) |
| static bool | cmpExcludesZero (CmpInst::Predicate Pred, const Value *RHS) |
| static void | breakSelfRecursivePHI (const Use *U, const PHINode *PHI, Value *&ValOut, Instruction *&CtxIOut, const PHINode **PhiOut=nullptr) |
| 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, const SimplifyQuery &SQ, bool Invert, unsigned Depth) |
| static void | computeKnownBitsFromShiftOperator (const Operator *I, const APInt &DemandedElts, KnownBits &Known, KnownBits &Known2, const SimplifyQuery &Q, unsigned Depth, 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, const SimplifyQuery &Q, unsigned Depth) |
| static KnownBits | computeKnownBitsForHorizontalOperation (const Operator *I, const APInt &DemandedElts, const SimplifyQuery &Q, unsigned Depth, 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, const SimplifyQuery &Q, unsigned Depth) |
| static bool | isPowerOfTwoRecurrence (const PHINode *PN, bool OrZero, SimplifyQuery &Q, unsigned Depth) |
| 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, const SimplifyQuery &Q, unsigned Depth) |
| 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? | |
| 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, const SimplifyQuery &Q, unsigned BitWidth, Value *X, Value *Y, bool NSW, bool NUW, unsigned Depth) |
| static bool | isNonZeroSub (const APInt &DemandedElts, const SimplifyQuery &Q, unsigned BitWidth, Value *X, Value *Y, unsigned Depth) |
| static bool | isNonZeroMul (const APInt &DemandedElts, const SimplifyQuery &Q, unsigned BitWidth, Value *X, Value *Y, bool NSW, bool NUW, unsigned Depth) |
| static bool | isNonZeroShift (const Operator *I, const APInt &DemandedElts, const SimplifyQuery &Q, const KnownBits &KnownVal, unsigned Depth) |
| static bool | isKnownNonZeroFromOperator (const Operator *I, const APInt &DemandedElts, const SimplifyQuery &Q, unsigned Depth) |
| 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, const SimplifyQuery &Q, unsigned Depth) |
| 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, const SimplifyQuery &Q, unsigned Depth) |
| 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, const SimplifyQuery &Q, unsigned Depth) |
| 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, const SimplifyQuery &Q, unsigned Depth) |
| static bool | isNonEqualSelect (const Value *V1, const Value *V2, const APInt &DemandedElts, const SimplifyQuery &Q, unsigned Depth) |
| static bool | isNonEqualPointersWithRecursiveGEP (const Value *A, const Value *B, const SimplifyQuery &Q) |
| static bool | isKnownNonEqualFromContext (const Value *V1, const Value *V2, const SimplifyQuery &Q, unsigned Depth) |
| 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, const SimplifyQuery &Q, unsigned Depth) |
| Return the number of times the sign bit of the register is replicated into the other bits. | |
| static bool | outputDenormalIsIEEEOrPosZero (const Function &F, const Type *Ty) |
| static void | computeKnownFPClassFromCond (const Value *V, Value *Cond, bool CondIsTrue, const Instruction *CxtI, KnownFPClass &KnownFromContext, unsigned Depth=0) |
| static KnownFPClass | computeKnownFPClassFromContext (const Value *V, const SimplifyQuery &Q) |
| void | computeKnownFPClass (const Value *V, const APInt &DemandedElts, FPClassTest InterestedClasses, KnownFPClass &Known, const SimplifyQuery &Q, unsigned Depth) |
| static void | computeKnownFPClass (const Value *V, KnownFPClass &Known, FPClassTest InterestedClasses, const SimplifyQuery &Q, unsigned Depth) |
| static void | computeKnownFPClassForFPTrunc (const Operator *Op, const APInt &DemandedElts, FPClassTest InterestedClasses, KnownFPClass &Known, const SimplifyQuery &Q, unsigned Depth) |
| 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) ? | |
| static SelectPatternResult | matchMinMaxOfMinMax (CmpInst::Predicate Pred, Value *CmpLHS, Value *CmpRHS, Value *TVal, Value *FVal, unsigned Depth) |
| Recognize variations of: a < 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. | |
| template<typename InstTy> | |
| static bool | matchTwoInputRecurrence (const PHINode *PN, InstTy *&Inst, Value *&Init, Value *&OtherOp) |
| 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 (CmpPredicate LPred, const Value *L0, const Value *L1, 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
|
strong |
| Enumerator | |
|---|---|
| PoisonOnly | |
| UndefOnly | |
| UndefOrPoison | |
Definition at line 7351 of file ValueTracking.cpp.
Function Documentation
◆ addValueAffectedByCondition()
|
static |
Definition at line 10126 of file ValueTracking.cpp.
References assert(), llvm::dyn_cast(), I, llvm::isa(), llvm::PatternMatch::m_CombineOr(), llvm::PatternMatch::m_PtrToInt(), llvm::PatternMatch::m_Trunc(), llvm::PatternMatch::m_Value(), and llvm::PatternMatch::match().
Referenced by llvm::findValuesAffectedByCondition().
◆ breakSelfRecursivePHI()
|
static |
Definition at line 600 of file ValueTracking.cpp.
References llvm::dyn_cast(), llvm::PatternMatch::m_Select(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), and PHI.
Referenced by computeKnownBitsFromOperator(), and computeKnownFPClass().
◆ BuildSubAggregate() [1/2]
|
static |
Definition at line 6263 of file ValueTracking.cpp.
References BuildSubAggregate(), llvm::PoisonValue::get(), llvm::ExtractValueInst::getIndexedType(), llvm::Value::getType(), and llvm::SmallVectorTemplateCommon< T, typename >::size().
◆ BuildSubAggregate() [2/2]
|
static |
Definition at line 6204 of file ValueTracking.cpp.
References llvm::ArrayRef(), BuildSubAggregate(), llvm::cast(), llvm::InsertValueInst::Create(), llvm::dyn_cast(), llvm::Instruction::eraseFromParent(), llvm::FindInsertedValue(), 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(), BuildSubAggregate(), and llvm::FindInsertedValue().
◆ canCreateUndefOrPoison()
|
static |
Definition at line 7365 of file ValueTracking.cpp.
References llvm::cast(), llvm::dyn_cast(), II, includesPoison(), llvm::is_contained(), llvm::isa(), llvm::Instruction::isBinaryOp(), llvm::PoisonMaskElem, and shiftAmountKnownInRange().
◆ cmpExcludesZero()
|
static |
Definition at line 569 of file ValueTracking.cpp.
References llvm::CallingConv::C, llvm::ConstantRange::contains(), llvm::dyn_cast(), llvm::APInt::getZero(), llvm::CmpInst::ICMP_NE, llvm::CmpInst::ICMP_UGT, llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_Zero(), llvm::ConstantRange::makeExactICmpRegion(), llvm::PatternMatch::match(), and RHS.
Referenced by isKnownNonNullFromDominatingCondition(), isKnownNonZeroFromAssume(), and isKnownNonZeroFromOperator().
◆ computeKnownBits()
|
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 2215 of file ValueTracking.cpp.
References A(), assert(), llvm::BitWidth, llvm::CallingConv::C, llvm::computeKnownBits(), llvm::computeKnownBitsFromContext(), computeKnownBitsFromOperator(), llvm::Depth, llvm::SimplifyQuery::DL, llvm::dyn_cast(), llvm::dyn_cast_or_null(), llvm::Constant::getAggregateElement(), llvm::APInt::getBitWidth(), llvm::KnownBits::getBitWidth(), llvm::DataLayout::getPointerTypeSizeInBits(), llvm::Type::getScalarType(), llvm::DataLayout::getTypeSizeInBits(), llvm::KnownBits::hasConflict(), I, llvm::isa(), llvm::Type::isPointerTy(), llvm::Log2(), llvm::PatternMatch::m_APInt(), llvm::KnownBits::makeConstant(), llvm::PatternMatch::match(), llvm::MaxAnalysisRecursionDepth, llvm::KnownBits::One, Range, llvm::KnownBits::resetAll(), llvm::KnownBits::setAllConflict(), llvm::KnownBits::setAllZero(), llvm::APInt::setLowBits(), and llvm::KnownBits::Zero.
◆ computeKnownBitsAddSub()
|
static |
Definition at line 349 of file ValueTracking.cpp.
References llvm::Add, llvm::KnownBits::computeForAddSub(), llvm::computeKnownBits(), llvm::SimplifyQuery::CxtI, llvm::Depth, llvm::SimplifyQuery::DL, llvm::CmpInst::ICMP_SLE, llvm::isImpliedByDomCondition(), llvm::KnownBits::isNonNegative(), llvm::KnownBits::isUnknown(), and llvm::KnownBits::makeNonNegative().
Referenced by computeKnownBitsFromOperator().
◆ computeKnownBitsForHorizontalOperation()
|
static |
Definition at line 1056 of file ValueTracking.cpp.
References llvm::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 |
Definition at line 682 of file ValueTracking.cpp.
References llvm::BitWidth, llvm::CallingConv::C, llvm::SimplifyQuery::DL, llvm::KnownBits::getBitWidth(), llvm::CmpInst::ICMP_EQ, llvm::CmpInst::ICMP_NE, llvm::CmpInst::ICMP_SGE, llvm::CmpInst::ICMP_SGT, llvm::CmpInst::ICMP_SLT, llvm::CmpInst::ICMP_UGE, llvm::CmpInst::ICMP_UGT, llvm::CmpInst::ICMP_ULE, llvm::CmpInst::ICMP_ULT, LHS, 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_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 |
Definition at line 810 of file ValueTracking.cpp.
References A(), llvm::KnownBits::anyext(), B(), llvm::cast(), computeKnownBitsFromCond(), computeKnownBitsFromICmpCond(), Cond, llvm::Depth, llvm::dyn_cast(), llvm::KnownBits::getBitWidth(), hasNoUnsignedWrap(), llvm::KnownBits::intersectWith(), llvm::PatternMatch::m_LogicalAnd(), llvm::PatternMatch::m_LogicalOp(), llvm::PatternMatch::m_LogicalOr(), llvm::MIPatternMatch::m_Not(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_Trunc(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), llvm::MaxAnalysisRecursionDepth, llvm::KnownBits::setAllOnes(), llvm::KnownBits::setAllZero(), llvm::KnownBits::unionWith(), and llvm::KnownBits::zext().
Referenced by llvm::adjustKnownBitsForSelectArm(), computeKnownBitsFromCond(), and llvm::computeKnownBitsFromContext().
◆ computeKnownBitsFromICmpCond()
|
static |
Definition at line 788 of file ValueTracking.cpp.
References llvm::KnownBits::anyext(), llvm::cast(), computeKnownBitsFromCmp(), llvm::KnownBits::getBitWidth(), hasNoUnsignedWrap(), LHS, llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_Trunc(), llvm::PatternMatch::match(), RHS, llvm::KnownBits::unionWith(), and llvm::KnownBits::zext().
Referenced by computeKnownBitsFromCond(), and llvm::computeKnownBitsFromContext().
◆ computeKnownBitsFromOperator()
|
static |
Definition at line 1207 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::BitWidth, breakSelfRecursivePHI(), llvm::KnownBits::byteSwap(), llvm::CallingConv::C, llvm::cast(), llvm::APInt::clearAllBits(), llvm::APInt::clearBit(), llvm::APInt::clearSignBit(), llvm::computeKnownBits(), computeKnownBitsAddSub(), computeKnownBitsForHorizontalOperation(), llvm::computeKnownBitsFromRangeMetadata(), computeKnownBitsFromShiftOperator(), computeKnownBitsMul(), llvm::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::dyn_cast(), llvm::KnownBits::extractBits(), llvm::fcAllFlags, llvm::fcInf, llvm::fcNan, llvm::fcNone, llvm::fcNormal, llvm::fcSubnormal, llvm::fcZero, llvm::gep_type_begin(), llvm::getAlign(), llvm::APInt::getAllOnes(), llvm::APInt::getBitWidth(), llvm::KnownBits::getBitWidth(), llvm::StructLayout::getElementOffset(), llvm::generic_gep_type_iterator< ItTy >::getIndexedType(), llvm::DataLayout::getIndexTypeSizeInBits(), 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::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent(), llvm::DataLayout::getPointerTypeSizeInBits(), llvm::Type::getScalarType(), llvm::generic_gep_type_iterator< ItTy >::getSequentialElementStride(), llvm::RISCVVType::getSEWLMULRatio(), llvm::getShuffleDemandedElts(), llvm::Constant::getSplatValue(), llvm::DataLayout::getStructLayout(), llvm::generic_gep_type_iterator< ItTy >::getStructTypeOrNull(), llvm::ConstantInt::getTrue(), llvm::Value::getType(), llvm::DataLayout::getTypeSizeInBits(), llvm::getVScaleRange(), llvm::SimplifyQuery::getWithInstruction(), llvm::SimplifyQuery::getWithoutCondContext(), llvm::APInt::getZero(), llvm::KnownBits::hasConflict(), llvm::InstrInfoQuery::hasNoSignedWrap(), llvm::InstrInfoQuery::hasNoUnsignedWrap(), I, II, llvm::SimplifyQuery::IIQ, llvm::KnownBits::insertBits(), llvm::KnownBits::intersectWith(), llvm::isa(), llvm::isa_and_nonnull(), llvm::KnownBits::isConstant(), llvm::InstrInfoQuery::isExact(), llvm::isGuaranteedNotToBePoison(), 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::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(), llvm::KnownBits::reverseBits(), RHS, llvm::RISCV::RVVBitsPerBlock, llvm::KnownBits::sadd_sat(), llvm::APIntOps::ScaleBitMask(), llvm::KnownBits::sdiv(), llvm::KnownBits::setAllConflict(), llvm::APInt::setBit(), llvm::APInt::setBitsFrom(), llvm::APInt::setHighBits(), llvm::APInt::setLowBits(), llvm::KnownBits::sext(), llvm::APInt::sextOrTrunc(), llvm::KnownBits::sextOrTrunc(), llvm::APInt::shl(), llvm::KnownBits::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 |
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 970 of file ValueTracking.cpp.
References llvm::computeKnownBits(), llvm::Depth, llvm::KnownBits::getBitWidth(), llvm::KnownBits::getMaxValue(), I, llvm::isKnownNonZero(), and llvm::KnownBits::isNonZero().
Referenced by computeKnownBitsFromOperator().
◆ computeKnownBitsMul()
|
static |
Definition at line 370 of file ValueTracking.cpp.
References llvm::SimplifyQuery::AC, llvm::computeKnownBits(), llvm::ComputeNumSignBits(), llvm::SimplifyQuery::CxtI, llvm::Depth, llvm::SimplifyQuery::DT, llvm::KnownBits::getBitWidth(), llvm::APInt::getHighBitsSet(), llvm::Type::getScalarSizeInBits(), llvm::Value::getType(), 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(), llvm::KnownBits::sgt(), and llvm::KnownBits::Zero.
Referenced by computeKnownBitsFromOperator().
◆ computeKnownFPClass() [1/2]
| void computeKnownFPClass | ( | const Value * | V, |
| const APInt & | DemandedElts, | ||
| FPClassTest | InterestedClasses, | ||
| KnownFPClass & | Known, | ||
| const SimplifyQuery & | Q, | ||
| unsigned | Depth ) |
Definition at line 4721 of file ValueTracking.cpp.
References llvm::SimplifyQuery::AC, assert(), llvm::BitWidth, breakSelfRecursivePHI(), llvm::CallingConv::C, llvm::KnownFPClass::cannotBeOrderedGreaterThanZero(), llvm::KnownFPClass::cannotBeOrderedLessThanZero(), llvm::cast(), llvm::APInt::clearBit(), llvm::computeConstantRange(), llvm::computeKnownBits(), llvm::computeKnownFPClass(), computeKnownFPClassForFPTrunc(), computeKnownFPClassFromContext(), Cond, llvm::KnownFPClass::copysign(), llvm::SimplifyQuery::CxtI, llvm::Depth, llvm::SimplifyQuery::DT, llvm::dyn_cast(), llvm::dyn_cast_or_null(), 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::getScalarType(), llvm::getShuffleDemandedElts(), llvm::ConstantRange::getSignedMin(), llvm::ConstantRange::getSingleElement(), llvm::Value::getType(), llvm::SimplifyQuery::getWithInstruction(), llvm::SimplifyQuery::getWithoutCondContext(), llvm::APFloat::getZero(), llvm::InstrInfoQuery::hasNoSignedZeros(), llvm::DenormalMode::IEEE, II, llvm::SimplifyQuery::IIQ, llvm::ilogb(), llvm::DenormalMode::Input, llvm::DenormalMode::inputsAreZero(), llvm::isa(), llvm::isa_and_nonnull(), llvm::ConstantRange::isAllNegative(), llvm::ConstantRange::isAllNonNegative(), 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_unreachable, llvm::PatternMatch::m_ConstantInt(), llvm::PatternMatch::m_ElementWiseBitCast(), llvm::PatternMatch::m_FCmp(), llvm::PatternMatch::m_Intrinsic(), llvm::PatternMatch::m_Value(), llvm::make_scope_exit(), llvm::KnownBits::makeConstant(), llvm::PatternMatch::match(), llvm::MaxAnalysisRecursionDepth, Mode, Opc, 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.
◆ computeKnownFPClass() [2/2]
|
static |
Definition at line 4688 of file ValueTracking.cpp.
References llvm::computeKnownFPClass(), llvm::Depth, llvm::dyn_cast(), and llvm::APInt::getAllOnes().
◆ computeKnownFPClassForFPTrunc()
|
static |
Definition at line 4697 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 |
Definition at line 4585 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_Intrinsic(), llvm::PatternMatch::m_LogicalAnd(), llvm::PatternMatch::m_LogicalOr(), llvm::MIPatternMatch::m_Not(), 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 |
Definition at line 4631 of file ValueTracking.cpp.
References llvm::SimplifyQuery::AC, llvm::CondContext::AffectedValues, assert(), llvm::AssumptionCache::assumptionsFor(), llvm::cast(), llvm::SimplifyQuery::CC, computeKnownFPClassFromCond(), Cond, llvm::CondContext::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, llvm::CondContext::Invert, and llvm::isValidAssumeForContext().
Referenced by computeKnownFPClass().
◆ ComputeNumSignBits() [1/2]
|
static |
Definition at line 4011 of file ValueTracking.cpp.
References assert(), ComputeNumSignBitsImpl(), and llvm::Depth.
◆ ComputeNumSignBits() [2/2]
Definition at line 324 of file ValueTracking.cpp.
References llvm::ComputeNumSignBits(), llvm::Depth, llvm::dyn_cast(), and llvm::APInt::getAllOnes().
◆ ComputeNumSignBitsImpl()
|
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 4025 of file ValueTracking.cpp.
References assert(), llvm::cast(), llvm::APInt::ceilLogBase2(), llvm::computeKnownBits(), llvm::ComputeNumSignBits(), computeNumSignBitsVectorConstant(), llvm::KnownBits::countMinSignBits(), llvm::SimplifyQuery::CxtI, llvm::Depth, llvm::SimplifyQuery::DL, llvm::dyn_cast(), llvm::APInt::getBitWidth(), llvm::PHINode::getIncomingBlock(), llvm::PHINode::getIncomingValue(), llvm::PHINode::getNumIncomingValues(), llvm::APInt::getNumSignBits(), llvm::Operator::getOpcode(), llvm::DataLayout::getPointerTypeSizeInBits(), llvm::Type::getScalarSizeInBits(), llvm::Type::getScalarType(), llvm::getShuffleDemandedElts(), llvm::BasicBlock::getTerminator(), llvm::DataLayout::getTypeSizeInBits(), llvm::SimplifyQuery::getWithoutCondContext(), llvm::APInt::getZExtValue(), II, llvm::isa(), 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 |
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 3984 of file ValueTracking.cpp.
References llvm::cast(), llvm::dyn_cast(), llvm::dyn_cast_or_null(), and llvm::isa().
Referenced by ComputeNumSignBitsImpl().
◆ computeOverflowForSignedAdd()
|
static |
Definition at line 7158 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 |
Definition at line 7526 of file ValueTracking.cpp.
References llvm::any_of(), llvm::Depth, llvm::dyn_cast(), I, II, llvm::is_contained(), llvm::PatternMatch::m_ExtractValue(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_WithOverflowInst(), and llvm::PatternMatch::match().
Referenced by impliesPoison().
◆ getBitWidth()
|
static |
Returns the bitwidth of the given scalar or pointer type.
For vector types, returns the element type's bitwidth.
Definition at line 95 of file ValueTracking.cpp.
References llvm::BitWidth, and DL.
Referenced by canConvertValue(), llvm::FunctionComparator::cmpTypes(), combineAnd(), combineAVX512SetCCToKMOV(), combineOr(), llvm::computeKnownBits(), llvm::computeKnownBits(), llvm::APInt::concat(), 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 |
Definition at line 9593 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(), and llvm::isImpliedByDomCondition().
◆ getInvertibleOperands()
|
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 3571 of file ValueTracking.cpp.
References llvm::cast(), getInvertibleOperands(), llvm::Operator::getOpcode(), llvm::User::getOperand(), getOperands(), llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent(), llvm::Value::getType(), llvm::isa(), llvm::PatternMatch::m_c_BinOp(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), llvm::matchSimpleRecurrence(), and llvm::Other.
Referenced by getInvertibleOperands(), and isKnownNonEqual().
◆ getKnownBitsFromAndXorOr()
|
static |
Definition at line 986 of file ValueTracking.cpp.
References llvm::BitWidth, llvm::KnownBits::blsi(), llvm::KnownBits::blsmsk(), llvm::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::MIPatternMatch::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()
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 8406 of file ValueTracking.cpp.
References llvm::CallingConv::C, llvm::PatternMatch::m_APInt(), llvm::MIPatternMatch::m_Not(), llvm::PatternMatch::m_Value(), and llvm::PatternMatch::match().
Referenced by matchMinMax().
◆ getRangeForIntrinsic()
|
static |
Definition at line 9868 of file ValueTracking.cpp.
References llvm::CallingConv::C, 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 |
Definition at line 9981 of file ValueTracking.cpp.
References llvm::BitWidth, llvm::CallingConv::C, llvm::cast(), llvm::ConstantRange::getNonEmpty(), llvm::APInt::getSignedMaxValue(), llvm::APInt::getSignedMinValue(), llvm::APInt::getZero(), llvm::InstrInfoQuery::hasNoSignedWrap(), LHS, llvm::PatternMatch::m_APInt(), llvm::MIPatternMatch::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 |
Definition at line 118 of file ValueTracking.cpp.
References assert(), llvm::cast(), llvm::User::getOperand(), llvm::getShuffleDemandedElts(), llvm::ShuffleVectorInst::getShuffleMask(), llvm::ShuffleVectorInst::getType(), llvm::Value::getType(), and llvm::isa().
◆ GetStringLengthH()
|
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 6510 of file ValueTracking.cpp.
References llvm::dyn_cast(), E(), llvm::getConstantDataArrayInfo(), GetStringLengthH(), and llvm::SmallPtrSetImpl< PtrType >::insert().
Referenced by llvm::GetStringLength(), and GetStringLengthH().
◆ getUnderlyingObjectFromInt()
This is the function that does the work of looking through basic ptrtoint+arithmetic+inttoptr sequences.
Definition at line 6789 of file ValueTracking.cpp.
References assert(), llvm::dyn_cast(), llvm::Operator::getOpcode(), and llvm::isa().
Referenced by llvm::getUnderlyingObjectsForCodeGen().
◆ handleGuaranteedNonPoisonOps()
|
static |
Enumerates all operands of I that are guaranteed to not be poison.
Definition at line 8056 of file ValueTracking.cpp.
References handleGuaranteedWellDefinedOps(), and I.
Referenced by llvm::mustTriggerUB().
◆ handleGuaranteedWellDefinedOps()
|
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 7994 of file ValueTracking.cpp.
References llvm::CallBase::arg_size(), llvm::cast(), llvm::CallBase::getArgOperand(), llvm::CallBase::getCalledOperand(), llvm::getPointerOperand(), I, llvm::CallBase::isIndirectCall(), and llvm::CallBase::paramHasAttr().
Referenced by handleGuaranteedNonPoisonOps(), and programUndefinedIfUndefOrPoison().
◆ haveNoCommonBitsSetSpecialCases()
|
static |
Definition at line 175 of file ValueTracking.cpp.
References A(), llvm::SimplifyQuery::AC, B(), llvm::SimplifyQuery::CxtI, llvm::SimplifyQuery::DT, 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::MIPatternMatch::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()
Definition at line 7554 of file ValueTracking.cpp.
References llvm::all_of(), llvm::canCreatePoison(), llvm::cast(), llvm::Depth, directlyImpliesPoison(), llvm::dyn_cast(), I, and llvm::isGuaranteedNotToBePoison().
◆ includesPoison()
|
static |
Definition at line 7357 of file ValueTracking.cpp.
References PoisonOnly.
Referenced by canCreateUndefOrPoison(), and isGuaranteedNotToBeUndefOrPoison().
◆ includesUndef()
|
static |
Definition at line 7361 of file ValueTracking.cpp.
References UndefOnly.
Referenced by isGuaranteedNotToBeUndefOrPoison().
◆ isEphemeralValueOf()
|
static |
Definition at line 467 of file ValueTracking.cpp.
References llvm::all_of(), llvm::dyn_cast(), E(), llvm::SmallVectorTemplateCommon< T, typename >::empty(), I, llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::is_contained(), llvm::SmallVectorImpl< T >::pop_back_val(), and llvm::SmallVectorTemplateBase< T, bool >::push_back().
Referenced by llvm::isValidAssumeForContext().
◆ isGEPKnownNonNull()
|
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 2637 of file ValueTracking.cpp.
References assert(), llvm::cast(), llvm::Depth, llvm::SimplifyQuery::DL, llvm::dyn_cast(), F, GEP, llvm::gep_type_begin(), llvm::gep_type_end(), llvm::StructLayout::getElementOffset(), llvm::DataLayout::getStructLayout(), llvm::ConstantInt::getZExtValue(), I, llvm::isKnownNonZero(), llvm::MaxAnalysisRecursionDepth, and llvm::NullPointerIsDefined().
Referenced by isKnownNonZeroFromOperator().
◆ isGuaranteedNotToBeUndefOrPoison()
|
static |
Definition at line 7581 of file ValueTracking.cpp.
References A(), llvm::all_of(), llvm::any_of(), llvm::CallingConv::C, llvm::canCreateUndefOrPoison(), llvm::cast(), Cond, llvm::Depth, llvm::dyn_cast(), llvm::dyn_cast_or_null(), llvm::DomTreeNodeBase< NodeT >::getIDom(), llvm::getKnowledgeValidInContext(), llvm::DominatorTreeBase< NodeT, IsPostDom >::getNode(), llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent(), I, includesPoison(), includesUndef(), llvm::isa(), llvm::isGuaranteedNotToBeUndefOrPoison(), llvm::MaxAnalysisRecursionDepth, and llvm::programUndefinedIfUndefOrPoison().
◆ isImpliedCondAndOr()
|
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 9455 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 |
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 9311 of file ValueTracking.cpp.
References llvm::CmpPredicate::dropSameSign(), llvm::ICmpInst::getFlippedSignednessPredicate(), llvm::CmpInst::getInversePredicate(), llvm::CmpPredicate::hasSameSign(), llvm::ConstantRange::icmp(), and llvm::ConstantRange::makeAllowedICmpRegion().
Referenced by isImpliedCondICmps().
◆ isImpliedCondICmps()
|
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 9343 of file ValueTracking.cpp.
References A(), B(), llvm::computeConstantRange(), DL, llvm::CmpPredicate::dropSameSign(), llvm::ICmpInst::getInverseCmpPredicate(), llvm::CmpPredicate::getMatching(), llvm::CmpPredicate::getPreferredSignedPredicate(), llvm::ICmpInst::getSwappedCmpPredicate(), llvm::CmpInst::ICMP_EQ, llvm::CmpInst::ICMP_NE, 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::isEquality(), llvm::ICmpInst::isImpliedByMatchingCmp(), isImpliedCondCommonOperandWithCR(), isImpliedCondOperands(), llvm::CmpInst::isSigned(), llvm::APInt::isZero(), 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_PtrToInt(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_Sub(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), llvm::MaxAnalysisRecursionDepth, P, and std::swap().
Referenced by llvm::isImpliedCondition().
◆ isImpliedCondOperands()
|
static |
Return true if "icmp Pred BLHS BRHS" is true whenever "icmp Pred ALHS ARHS" is true.
Otherwise, return std::nullopt.
Definition at line 9271 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 |
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 2414 of file ValueTracking.cpp.
References Cond, llvm::CmpInst::getInversePredicate(), llvm::CmpInst::ICMP_EQ, llvm::CmpInst::ICMP_ULT, llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_ICmp(), llvm::PatternMatch::m_Intrinsic(), llvm::PatternMatch::m_Specific(), and llvm::PatternMatch::match().
Referenced by llvm::isKnownToBeAPowerOfTwo().
◆ isKnownNonEqual()
|
static |
Return true if it is known that V1 != V2.
Definition at line 3904 of file ValueTracking.cpp.
References A(), B(), llvm::cast(), llvm::computeKnownBits(), llvm::Depth, llvm::SimplifyQuery::DL, llvm::dyn_cast(), getInvertibleOperands(), llvm::Value::getType(), llvm::APInt::intersects(), llvm::Type::isIntOrIntVectorTy(), llvm::isKnownNonEqual(), isKnownNonEqualFromContext(), 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.
◆ isKnownNonEqualFromContext()
|
static |
Definition at line 3846 of file ValueTracking.cpp.
References llvm::SimplifyQuery::AC, assert(), llvm::AssumptionCache::assumptionsFor(), llvm::cast(), Cond, llvm::DomConditionCache::conditionsFor(), llvm::SimplifyQuery::CxtI, llvm::SimplifyQuery::DC, llvm::Depth, llvm::SimplifyQuery::DL, llvm::DominatorTree::dominates(), llvm::SimplifyQuery::DT, llvm::Instruction::getFunction(), llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent(), I, llvm::CmpInst::ICMP_NE, llvm::isImpliedCondition(), and llvm::isValidAssumeForContext().
Referenced by isKnownNonEqual().
◆ isKnownNonNaN()
|
static |
Definition at line 8180 of file ValueTracking.cpp.
References llvm::CallingConv::C, llvm::dyn_cast(), E(), I, llvm::isa(), and llvm::FastMathFlags::noNaNs().
Referenced by matchSelectPattern().
◆ isKnownNonNullFromDominatingCondition()
|
static |
Definition at line 2701 of file ValueTracking.cpp.
References assert(), llvm::cast(), cmpExcludesZero(), DomConditionsMaxUses, llvm::DominatorTree::dominates(), llvm::dyn_cast(), llvm::SmallVectorTemplateCommon< T, typename >::empty(), llvm::Instruction::getFunction(), llvm::CmpInst::getInversePredicate(), llvm::getLoadStorePointerOperand(), llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent(), llvm::Type::getPointerAddressSpace(), llvm::GlobalValue::getType(), llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::isa(), llvm::isGuard(), 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(), RHS, and llvm::Value::users().
Referenced by isKnownNonZero().
◆ isKnownNonZero() [1/2]
Definition at line 8203 of file ValueTracking.cpp.
References llvm::CallingConv::C, llvm::dyn_cast(), E(), and I.
◆ isKnownNonZero() [2/2]
|
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 3458 of file ValueTracking.cpp.
References A(), assert(), llvm::CallingConv::C, llvm::SimplifyQuery::CxtI, llvm::Depth, llvm::SimplifyQuery::DT, llvm::dyn_cast(), llvm::APInt::getBitWidth(), I, llvm::isa(), isKnownNonNullFromDominatingCondition(), llvm::isKnownNonZero(), isKnownNonZeroFromAssume(), isKnownNonZeroFromOperator(), llvm::Constant::isNullValue(), llvm::MaxAnalysisRecursionDepth, llvm::NullPointerIsDefined(), Range, and llvm::stripNullTest().
◆ isKnownNonZeroFromAssume()
|
static |
Definition at line 635 of file ValueTracking.cpp.
References llvm::SimplifyQuery::AC, assert(), llvm::AssumptionCache::assumptionsFor(), llvm::cast(), cmpExcludesZero(), llvm::SimplifyQuery::CxtI, llvm::SimplifyQuery::DT, llvm::AssumptionCache::ExprResultIdx, llvm::Instruction::getFunction(), llvm::getKnowledgeFromBundle(), llvm::Type::getPointerAddressSpace(), llvm::GlobalValue::getType(), 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 |
Definition at line 2993 of file ValueTracking.cpp.
References llvm::KnownBits::abs(), llvm::SimplifyQuery::AC, llvm::all_of(), llvm::BitWidth, Call, llvm::cast(), llvm::APInt::clearBit(), cmpExcludesZero(), llvm::computeKnownBits(), llvm::SimplifyQuery::CxtI, llvm::Depth, llvm::SimplifyQuery::DL, llvm::SimplifyQuery::DT, llvm::dyn_cast(), llvm::APInt::getAllOnes(), llvm::CallBase::getArgOperand(), llvm::getArgumentAliasingToReturnedPointer(), llvm::BinaryOpIntrinsic::getBinaryOp(), getBitWidth(), llvm::APInt::getBitWidth(), llvm::details::FixedOrScalableQuantity< LeafTy, ValueTy >::getFixedValue(), llvm::CmpInst::getInversePredicate(), llvm::InstrInfoQuery::getMetadata(), llvm::APInt::getOneBitSet(), llvm::Type::getScalarType(), llvm::getShuffleDemandedElts(), llvm::Value::getType(), llvm::DataLayout::getTypeSizeInBits(), llvm::SimplifyQuery::getWithoutCondContext(), llvm::APInt::getZero(), llvm::InstrInfoQuery::hasNoSignedWrap(), llvm::InstrInfoQuery::hasNoUnsignedWrap(), I, II, llvm::SimplifyQuery::IIQ, llvm::isa(), llvm::PossiblyExactOperator::isExact(), isGEPKnownNonNull(), llvm::isGuaranteedNotToBePoison(), llvm::Type::isIntOrIntVectorTy(), llvm::isKnownNonEqual(), llvm::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_ExtractValue(), 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 |
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 3687 of file ValueTracking.cpp.
References llvm::cast(), llvm::Depth, llvm::dyn_cast(), llvm::BinaryOperator::getOpcode(), llvm::User::getOperand(), and llvm::isKnownNonZero().
Referenced by isKnownNonEqual().
◆ isNonEqualMul()
|
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 3716 of file ValueTracking.cpp.
References llvm::CallingConv::C, llvm::Depth, llvm::dyn_cast(), llvm::isKnownNonZero(), llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_Mul(), llvm::PatternMatch::m_Specific(), and llvm::PatternMatch::match().
Referenced by isKnownNonEqual().
◆ isNonEqualPHIs()
|
static |
Definition at line 3743 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(), llvm::isKnownNonEqual(), llvm::PatternMatch::m_APInt(), and llvm::PatternMatch::match().
Referenced by isKnownNonEqual().
◆ isNonEqualPointersWithRecursiveGEP()
|
static |
Definition at line 3799 of file ValueTracking.cpp.
References A(), B(), llvm::SimplifyQuery::DL, llvm::dyn_cast(), llvm::DataLayout::getIndexTypeSizeInBits(), llvm::isa(), llvm::APInt::isNegative(), llvm::APInt::isStrictlyPositive(), llvm::APInt::sge(), llvm::APInt::sle(), and llvm::Value::stripAndAccumulateInBoundsConstantOffsets().
Referenced by isKnownNonEqual().
◆ isNonEqualSelect()
|
static |
Definition at line 3774 of file ValueTracking.cpp.
References llvm::Depth, llvm::dyn_cast(), llvm::SelectInst::getCondition(), llvm::SelectInst::getFalseValue(), llvm::SelectInst::getTrueValue(), and llvm::isKnownNonEqual().
Referenced by isKnownNonEqual().
◆ isNonEqualShl()
|
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 3731 of file ValueTracking.cpp.
References llvm::CallingConv::C, llvm::Depth, llvm::dyn_cast(), llvm::isKnownNonZero(), llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_Shl(), llvm::PatternMatch::m_Specific(), and llvm::PatternMatch::match().
Referenced by isKnownNonEqual().
◆ isNonZeroAdd()
|
static |
Definition at line 2852 of file ValueTracking.cpp.
References llvm::KnownBits::add(), llvm::BitWidth, llvm::computeKnownBits(), llvm::Depth, llvm::APInt::getSignedMaxValue(), llvm::APInt::intersects(), llvm::isKnownNonZero(), llvm::isKnownToBeAPowerOfTwo(), llvm::KnownBits::isNegative(), llvm::KnownBits::isNonNegative(), llvm::KnownBits::isNonZero(), matchOpWithOpEqZero(), llvm::KnownBits::One, X, and Y.
Referenced by isKnownNonZeroFromOperator().
◆ isNonZeroMul()
|
static |
Definition at line 2914 of file ValueTracking.cpp.
References llvm::BitWidth, llvm::computeKnownBits(), llvm::KnownBits::countMaxTrailingZeros(), llvm::Depth, llvm::isKnownNonZero(), llvm::KnownBits::isNonZero(), llvm::KnownBits::One, X, and Y.
Referenced by isKnownNonZeroFromOperator().
◆ isNonZeroRecurrence()
Try to detect a recurrence that monotonically increases/decreases from a non-zero starting value.
These are common as induction variables.
Definition at line 2817 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 |
Definition at line 2942 of file ValueTracking.cpp.
References llvm::APInt::ashr(), llvm::computeKnownBits(), llvm::Depth, llvm::APInt::getAllOnes(), llvm::KnownBits::getBitWidth(), llvm::KnownBits::getMaxValue(), I, llvm::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 |
Definition at line 2898 of file ValueTracking.cpp.
References llvm::BitWidth, llvm::CallingConv::C, llvm::Depth, llvm::dyn_cast(), llvm::isKnownNonZero(), matchOpWithOpEqZero(), X, and Y.
Referenced by isKnownNonZeroFromOperator().
◆ isPowerOfTwoRecurrence()
|
static |
Try to detect a recurrence that the value of the induction variable is always a power of two (or zero).
Definition at line 2357 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()
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 6631 of file ValueTracking.cpp.
References llvm::dyn_cast(), 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 |
Definition at line 1151 of file ValueTracking.cpp.
References assert(), llvm::cast(), llvm::SelectPatternResult::Flavor, llvm::getInverseMinMaxFlavor(), getOpcode(), llvm::isa(), LHS, llvm::PatternMatch::m_APInt(), llvm::PatternMatch::match(), llvm::matchSelectPattern(), RHS, Select, llvm::APInt::sle(), llvm::SPF_SMAX, llvm::SPF_SMIN, and std::swap().
Referenced by ComputeNumSignBitsImpl().
◆ isSignedMinMaxIntrinsicClamp()
|
static |
Definition at line 1180 of file ValueTracking.cpp.
References assert(), llvm::dyn_cast(), llvm::getInverseMinMaxIntrinsic(), II, llvm::PatternMatch::m_APInt(), llvm::PatternMatch::match(), llvm::APInt::sle(), and std::swap().
Referenced by ComputeNumSignBitsImpl(), and unionWithMinMaxIntrinsicClamp().
◆ isTruePredicate()
Return true if "icmp Pred LHS RHS" is always true.
Definition at line 9189 of file ValueTracking.cpp.
References llvm::CallingConv::C, llvm::cast(), 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 |
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):
- As operand of cast instruction when both values of "select" are same cast instructions.
- 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().
- 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 8923 of file ValueTracking.cpp.
References assert(), llvm::CallingConv::C, llvm::dyn_cast(), llvm::User::getOperand(), llvm::Value::getType(), lookThroughCastConst(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_ZExtOrSExt(), and llvm::PatternMatch::match().
Referenced by llvm::matchDecomposedSelectPattern().
◆ lookThroughCastConst()
|
static |
Definition at line 8828 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 |
Convert ConstantRange OverflowResult into ValueTracking OverflowResult.
Definition at line 7064 of file ValueTracking.cpp.
References llvm::ConstantRange::AlwaysOverflowsHigh, llvm::AlwaysOverflowsHigh, llvm::ConstantRange::AlwaysOverflowsLow, llvm::AlwaysOverflowsLow, llvm_unreachable, llvm::ConstantRange::MayOverflow, llvm::MayOverflow, llvm::ConstantRange::NeverOverflows, and llvm::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 |
Recognize variations of: CLAMP(v,l,h) ==> ((v) < (l) ?
(l) : ((v) > (h) ? (h) : (v)))
Definition at line 8274 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 |
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 8224 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 |
Match non-obvious integer minimum and maximum sequences.
Definition at line 8419 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 |
Recognize variations of: a < c ?
min(a,b) : min(b,c) ==> min(min(a,b),min(b,c))
Definition at line 8310 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::MIPatternMatch::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()
Definition at line 2845 of file ValueTracking.cpp.
References llvm::CmpInst::ICMP_EQ, 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 |
Definition at line 8654 of file ValueTracking.cpp.
References llvm::cast(), 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::MIPatternMatch::m_Neg(), llvm::PatternMatch::m_One(), llvm::PatternMatch::m_SExt(), llvm::PatternMatch::m_Specific(), llvm::MIPatternMatch::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().
◆ matchTwoInputRecurrence()
|
static |
Definition at line 9126 of file ValueTracking.cpp.
References llvm::dyn_cast(), llvm::PHINode::getIncomingValue(), llvm::PHINode::getNumIncomingValues(), I, LHS, Operation, and RHS.
Referenced by llvm::matchSimpleBinaryIntrinsicRecurrence(), and llvm::matchSimpleRecurrence().
◆ onlyUsedByLifetimeMarkersOrDroppableInstsHelper()
|
static |
Definition at line 6896 of file ValueTracking.cpp.
References llvm::dyn_cast(), II, and llvm::Value::users().
Referenced by llvm::onlyUsedByLifetimeMarkers(), and llvm::onlyUsedByLifetimeMarkersOrDroppableInsts().
◆ outputDenormalIsIEEEOrPosZero()
Definition at line 4540 of file ValueTracking.cpp.
References F, llvm::DenormalMode::IEEE, Mode, and llvm::DenormalMode::PositiveZero.
Referenced by computeKnownFPClass().
◆ programUndefinedIfUndefOrPoison()
Definition at line 8078 of file ValueTracking.cpp.
References llvm::BasicBlock::begin(), llvm::SmallPtrSetImpl< PtrType >::count(), llvm::dyn_cast(), llvm::BasicBlock::end(), llvm::Function::getEntryBlock(), llvm::BasicBlock::getFirstNonPHIIt(), llvm::ilist_node_impl< OptionsT >::getIterator(), llvm::BasicBlock::getParent(), llvm::BasicBlock::getSingleSuccessor(), handleGuaranteedWellDefinedOps(), I, llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::isGuaranteedToTransferExecutionToSuccessor(), llvm::make_range(), llvm::mustTriggerUB(), PoisonOnly, and llvm::propagatesPoison().
◆ rangeMetadataExcludesValue()
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 2800 of file ValueTracking.cpp.
References assert(), llvm::mdconst::extract(), llvm::Lower, Range, and llvm::Upper.
Referenced by isKnownNonZeroFromOperator().
◆ safeCxtI()
|
static |
Definition at line 104 of file ValueTracking.cpp.
References llvm::dyn_cast(), and llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent().
Referenced by llvm::computeKnownBits(), llvm::computeKnownBits(), llvm::computeKnownBits(), llvm::ComputeNumSignBits(), and llvm::isKnownToBeAPowerOfTwo().
◆ setLimitForFPToI()
|
static |
Definition at line 10028 of file ValueTracking.cpp.
References llvm::BitWidth, I, llvm::isa(), llvm::Lower, and llvm::Upper.
Referenced by llvm::computeConstantRange().
◆ setLimitsForBinOp()
|
static |
Definition at line 9643 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::InstrInfoQuery::hasNoSignedWrap(), llvm::Instruction::hasNoSignedWrap(), llvm::InstrInfoQuery::hasNoUnsignedWrap(), llvm::InstrInfoQuery::isExact(), llvm::Lower, llvm::APInt::lshr(), llvm::PatternMatch::m_APInt(), llvm::MIPatternMatch::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()
Shifts return poison if shiftwidth is larger than the bitwidth.
Definition at line 7327 of file ValueTracking.cpp.
References llvm::all_of(), llvm::CallingConv::C, llvm::dyn_cast(), llvm::dyn_cast_or_null(), llvm::isa(), and llvm::SmallVectorTemplateBase< T, bool >::push_back().
Referenced by canCreateUndefOrPoison().
◆ unionWithMinMaxIntrinsicClamp()
|
static |
Definition at line 1199 of file ValueTracking.cpp.
References llvm::ConstantRange::getNonEmpty(), II, isSignedMinMaxIntrinsicClamp(), and llvm::KnownBits::unionWith().
Referenced by computeKnownBitsFromOperator().
Variable Documentation
◆ DomConditionsMaxUses
|
static |
Referenced by isKnownNonNullFromDominatingCondition().
Generated on for LLVM by
1.14.0