LoopVectorizationLegality checks if it is legal to vectorize a loop, and to what vectorization factor. More...

#include "llvm/Transforms/Vectorize/LoopVectorizationLegality.h"

Public Types
using	ReductionList = MapVector< PHINode *, RecurrenceDescriptor >
	ReductionList contains the reduction descriptors for all of the reductions that were found in the loop.

using	InductionList = MapVector< PHINode *, InductionDescriptor >
	InductionList saves induction variables and maps them to the induction descriptor.

using	RecurrenceSet = SmallPtrSet< const PHINode *, 8 >
	RecurrenceSet contains the phi nodes that are recurrences other than inductions and reductions.

Public Member Functions
	LoopVectorizationLegality (Loop L, PredicatedScalarEvolution &PSE, DominatorTree DT, TargetTransformInfo TTI, TargetLibraryInfo TLI, Function F, LoopAccessInfoManager &LAIs, LoopInfo LI, OptimizationRemarkEmitter ORE, LoopVectorizationRequirements R, LoopVectorizeHints H, DemandedBits DB, AssumptionCache AC, BlockFrequencyInfo BFI, ProfileSummaryInfo *PSI)

bool	canVectorize (bool UseVPlanNativePath)
	Returns true if it is legal to vectorize this loop.

bool	canVectorizeFPMath (bool EnableStrictReductions)
	Returns true if it is legal to vectorize the FP math operations in this loop.

bool	prepareToFoldTailByMasking ()
	Return true if we can vectorize this loop while folding its tail by masking, and mark all respective loads/stores for masking.

PHINode *	getPrimaryInduction ()
	Returns the primary induction variable.

const ReductionList &	getReductionVars () const
	Returns the reduction variables found in the loop.

const InductionList &	getInductionVars () const
	Returns the induction variables found in the loop.

RecurrenceSet &	getFixedOrderRecurrences ()
	Return the fixed-order recurrences found in the loop.

Type *	getWidestInductionType ()
	Returns the widest induction type.

bool	isInvariantStoreOfReduction (StoreInst *SI)
	Returns True if given store is a final invariant store of one of the reductions found in the loop.

bool	isInvariantAddressOfReduction (Value *V)
	Returns True if given address is invariant and is used to store recurrent expression.

bool	isInductionPhi (const Value *V) const
	Returns True if V is a Phi node of an induction variable in this loop.

const InductionDescriptor *	getIntOrFpInductionDescriptor (PHINode *Phi) const
	Returns a pointer to the induction descriptor, if `Phi` is an integer or floating point induction.

const InductionDescriptor *	getPointerInductionDescriptor (PHINode *Phi) const
	Returns a pointer to the induction descriptor, if `Phi` is pointer induction.

bool	isCastedInductionVariable (const Value *V) const
	Returns True if V is a cast that is part of an induction def-use chain, and had been proven to be redundant under a runtime guard (in other words, the cast has the same SCEV expression as the induction phi).

bool	isInductionVariable (const Value *V) const
	Returns True if V can be considered as an induction variable in this loop.

bool	isReductionVariable (PHINode *PN) const
	Returns True if PN is a reduction variable in this loop.

bool	isFixedOrderRecurrence (const PHINode *Phi) const
	Returns True if Phi is a fixed-order recurrence in this loop.

bool	blockNeedsPredication (BasicBlock *BB) const
	Return true if the block BB needs to be predicated in order for the loop to be vectorized.

int	isConsecutivePtr (Type AccessTy, Value Ptr) const
	Check if this pointer is consecutive when vectorizing.

bool	isInvariant (Value *V) const
	Returns true if value V is uniform across `VF` lanes, when `VF` is provided, and otherwise if `V` is invariant across all loop iterations.

bool	isUniform (Value *V, ElementCount VF) const
	Returns true if value V is uniform across `VF` lanes, when `VF` is provided, and otherwise if `V` is invariant across all loop iterations.

bool	isUniformMemOp (Instruction &I, ElementCount VF) const
	A uniform memory op is a load or store which accesses the same memory location on all `VF` lanes, if `VF` is provided and otherwise if the memory location is invariant.

const RuntimePointerChecking *	getRuntimePointerChecking () const
	Returns the information that we collected about runtime memory check.

const LoopAccessInfo *	getLAI () const

bool	isSafeForAnyVectorWidth () const

uint64_t	getMaxSafeVectorWidthInBits () const

bool	isMaskRequired (const Instruction *I) const
	Returns true if vector representation of the instruction `I` requires mask.

bool	hasVectorCallVariants () const
	Returns true if there is at least one function call in the loop which has a vectorized variant available.

unsigned	getNumStores () const

unsigned	getNumLoads () const

PredicatedScalarEvolution *	getPredicatedScalarEvolution () const

Loop *	getLoop () const

LoopInfo *	getLoopInfo () const

AssumptionCache *	getAssumptionCache () const

ScalarEvolution *	getScalarEvolution () const

DominatorTree *	getDominatorTree () const

Detailed Description

LoopVectorizationLegality checks if it is legal to vectorize a loop, and to what vectorization factor.

This class does not look at the profitability of vectorization, only the legality. This class has two main kinds of checks:

Memory checks - The code in canVectorizeMemory checks if vectorization will change the order of memory accesses in a way that will change the correctness of the program.
Scalars checks - The code in canVectorizeInstrs and canVectorizeMemory checks for a number of different conditions, such as the availability of a single induction variable, that all types are supported and vectorize-able, etc. This code reflects the capabilities of InnerLoopVectorizer. This class is also used by InnerLoopVectorizer for identifying induction variable and the different reduction variables.

Definition at line 240 of file LoopVectorizationLegality.h.

Member Typedef Documentation

◆ InductionList

using llvm::LoopVectorizationLegality::InductionList = MapVector<PHINode *, InductionDescriptor>

InductionList saves induction variables and maps them to the induction descriptor.

Definition at line 258 of file LoopVectorizationLegality.h.

◆ RecurrenceSet

using llvm::LoopVectorizationLegality::RecurrenceSet = SmallPtrSet<const PHINode *, 8>

RecurrenceSet contains the phi nodes that are recurrences other than inductions and reductions.

Definition at line 262 of file LoopVectorizationLegality.h.

◆ ReductionList

using llvm::LoopVectorizationLegality::ReductionList = MapVector<PHINode *, RecurrenceDescriptor>

ReductionList contains the reduction descriptors for all of the reductions that were found in the loop.

Definition at line 254 of file LoopVectorizationLegality.h.

Constructor & Destructor Documentation

◆ LoopVectorizationLegality()

llvm::LoopVectorizationLegality::LoopVectorizationLegality	(	Loop *	L,
		PredicatedScalarEvolution &	PSE,
		DominatorTree *	DT,
		TargetTransformInfo *	TTI,
		TargetLibraryInfo *	TLI,
		Function *	F,
		LoopAccessInfoManager &	LAIs,
		LoopInfo *	LI,
		OptimizationRemarkEmitter *	ORE,
		LoopVectorizationRequirements *	R,
		LoopVectorizeHints *	H,
		DemandedBits *	DB,
		AssumptionCache *	AC,
		BlockFrequencyInfo *	BFI,
		ProfileSummaryInfo *	PSI
	)

inline

Definition at line 242 of file LoopVectorizationLegality.h.

Member Function Documentation

◆ blockNeedsPredication()

bool llvm::LoopVectorizationLegality::blockNeedsPredication ( BasicBlock * BB ) const

Return true if the block BB needs to be predicated in order for the loop to be vectorized.

Definition at line 1244 of file LoopVectorizationLegality.cpp.

References llvm::LoopAccessInfo::blockNeedsPredication().

Referenced by llvm::LoopVectorizationCostModel::blockNeedsPredicationForAnyReason(), llvm::LoopVectorizationCostModel::expectedCost(), llvm::LoopVectorizationCostModel::isPredicatedInst(), and isUniformMemOp().

◆ canVectorize()

bool llvm::LoopVectorizationLegality::canVectorize ( bool UseVPlanNativePath )

Returns true if it is legal to vectorize this loop.

This does not mean that it is profitable to vectorize this loop, only that it is legal to do so. Temporarily taking UseVPlanNativePath parameter. If true, take the new code path being implemented for outer loop vectorization (should be functional for inner loop vectorization) based on VPlan. If false, good old LV code.

Definition at line 1434 of file LoopVectorizationLegality.cpp.

References llvm::OptimizationRemarkEmitter::allowExtraAnalysis(), assert(), llvm::dbgs(), DEBUG_TYPE, llvm::LoopVectorizeHints::FK_Enabled, llvm::SCEVPredicate::getComplexity(), llvm::LoopBase< BlockT, LoopT >::getHeader(), llvm::Value::getName(), llvm::LoopBase< BlockT, LoopT >::getNumBlocks(), llvm::PredicatedScalarEvolution::getPredicate(), llvm::LoopAccessInfo::getRuntimePointerChecking(), llvm::LoopBase< BlockT, LoopT >::isInnermost(), LLVM_DEBUG, llvm::RuntimePointerChecking::Need, PragmaVectorizeSCEVCheckThreshold, llvm::reportVectorizationFailure(), and VectorizeSCEVCheckThreshold.

Referenced by llvm::LoopVectorizePass::processLoop().

◆ canVectorizeFPMath()

bool llvm::LoopVectorizationLegality::canVectorizeFPMath ( bool EnableStrictReductions )

Returns true if it is legal to vectorize the FP math operations in this loop.

Vectorizing is legal if we allow reordering of FP operations, or if we can use in-order reductions.

Definition at line 1153 of file LoopVectorizationLegality.cpp.

References llvm::all_of(), llvm::any_of(), llvm::LoopVectorizationRequirements::getExactFPInst(), llvm::InductionDescriptor::getExactFPMathInst(), getInductionVars(), getReductionVars(), llvm::RecurrenceDescriptor::hasExactFPMath(), llvm::RecurrenceDescriptor::isOrdered(), and Reduction.

Referenced by llvm::LoopVectorizePass::processLoop().

◆ getAssumptionCache()

AssumptionCache * llvm::LoopVectorizationLegality::getAssumptionCache ( ) const

inline

Definition at line 398 of file LoopVectorizationLegality.h.

Referenced by llvm::ARMTTIImpl::preferPredicateOverEpilogue().

◆ getDominatorTree()

DominatorTree * llvm::LoopVectorizationLegality::getDominatorTree ( ) const

inline

Definition at line 402 of file LoopVectorizationLegality.h.

Referenced by llvm::ARMTTIImpl::preferPredicateOverEpilogue().

◆ getFixedOrderRecurrences()

RecurrenceSet & llvm::LoopVectorizationLegality::getFixedOrderRecurrences ( )

inline

Return the fixed-order recurrences found in the loop.

Definition at line 293 of file LoopVectorizationLegality.h.

Referenced by llvm::AArch64TTIImpl::preferPredicateOverEpilogue().

◆ getInductionVars()

const InductionList & llvm::LoopVectorizationLegality::getInductionVars ( ) const

inline

Returns the induction variables found in the loop.

Definition at line 290 of file LoopVectorizationLegality.h.

Referenced by canVectorizeFPMath(), llvm::LoopVectorizationCostModel::collectValuesToIgnore(), llvm::InnerLoopVectorizer::createInductionResumeValues(), llvm::InnerLoopVectorizer::fixVectorizedLoop(), getIntOrFpInductionDescriptor(), getPointerInductionDescriptor(), and prepareToFoldTailByMasking().

◆ getIntOrFpInductionDescriptor()

const InductionDescriptor * llvm::LoopVectorizationLegality::getIntOrFpInductionDescriptor ( PHINode * Phi ) const

Returns a pointer to the induction descriptor, if Phi is an integer or floating point induction.

Definition at line 1209 of file LoopVectorizationLegality.cpp.

References llvm::MapVector< KeyT, ValueT, MapType, VectorType >::find(), getInductionVars(), llvm::InductionDescriptor::IK_FpInduction, llvm::InductionDescriptor::IK_IntInduction, and isInductionPhi().

◆ getLAI()

const LoopAccessInfo * llvm::LoopVectorizationLegality::getLAI ( ) const

inline

Definition at line 367 of file LoopVectorizationLegality.h.

Referenced by llvm::LoopVectorizationPlanner::executePlan(), llvm::ARMTTIImpl::preferPredicateOverEpilogue(), llvm::LoopVectorizePass::processLoop(), processLoopInVPlanNativePath(), and llvm::LoopVectorizationCostModel::runtimeChecksRequired().

◆ getLoop()

Loop * llvm::LoopVectorizationLegality::getLoop ( ) const

inline

Definition at line 394 of file LoopVectorizationLegality.h.

Referenced by llvm::AArch64TTIImpl::preferPredicateOverEpilogue(), and llvm::ARMTTIImpl::preferPredicateOverEpilogue().

◆ getLoopInfo()

LoopInfo * llvm::LoopVectorizationLegality::getLoopInfo ( ) const

inline

Definition at line 396 of file LoopVectorizationLegality.h.

Referenced by llvm::ARMTTIImpl::preferPredicateOverEpilogue().

◆ getMaxSafeVectorWidthInBits()

uint64_t llvm::LoopVectorizationLegality::getMaxSafeVectorWidthInBits ( ) const

inline

Definition at line 373 of file LoopVectorizationLegality.h.

References llvm::LoopAccessInfo::getDepChecker(), and llvm::MemoryDepChecker::getMaxSafeVectorWidthInBits().

◆ getNumLoads()

unsigned llvm::LoopVectorizationLegality::getNumLoads ( ) const

inline

Definition at line 388 of file LoopVectorizationLegality.h.

References llvm::LoopAccessInfo::getNumLoads().

Referenced by llvm::LoopVectorizationCostModel::selectInterleaveCount().

◆ getNumStores()

unsigned llvm::LoopVectorizationLegality::getNumStores ( ) const

inline

Definition at line 387 of file LoopVectorizationLegality.h.

References llvm::LoopAccessInfo::getNumStores().

Referenced by llvm::LoopVectorizationCostModel::selectInterleaveCount().

◆ getPointerInductionDescriptor()

const InductionDescriptor * llvm::LoopVectorizationLegality::getPointerInductionDescriptor ( PHINode * Phi ) const

Returns a pointer to the induction descriptor, if Phi is pointer induction.

Definition at line 1220 of file LoopVectorizationLegality.cpp.

References llvm::MapVector< KeyT, ValueT, MapType, VectorType >::find(), getInductionVars(), llvm::InductionDescriptor::IK_PtrInduction, and isInductionPhi().

◆ getPredicatedScalarEvolution()

PredicatedScalarEvolution * llvm::LoopVectorizationLegality::getPredicatedScalarEvolution ( ) const

inline

Definition at line 390 of file LoopVectorizationLegality.h.

Referenced by llvm::AArch64TTIImpl::preferPredicateOverEpilogue().

◆ getPrimaryInduction()

PHINode * llvm::LoopVectorizationLegality::getPrimaryInduction ( )

inline

Returns the primary induction variable.

Definition at line 284 of file LoopVectorizationLegality.h.

Referenced by llvm::InnerLoopVectorizer::createInductionResumeValue(), and llvm::LoopVectorizationCostModel::isOptimizableIVTruncate().

◆ getReductionVars()

const ReductionList & llvm::LoopVectorizationLegality::getReductionVars ( ) const

inline

Returns the reduction variables found in the loop.

Definition at line 287 of file LoopVectorizationLegality.h.

Referenced by canVectorizeFPMath(), llvm::LoopVectorizationCostModel::canVectorizeReductions(), llvm::LoopVectorizationCostModel::collectElementTypesForWidening(), llvm::LoopVectorizationCostModel::collectInLoopReductions(), llvm::LoopVectorizationCostModel::collectValuesToIgnore(), llvm::LoopVectorizationCostModel::getSmallestAndWidestTypes(), isInvariantAddressOfReduction(), isInvariantStoreOfReduction(), llvm::AArch64TTIImpl::preferPredicateOverEpilogue(), prepareToFoldTailByMasking(), llvm::LoopVectorizationCostModel::selectInterleaveCount(), llvm::LoopVectorizationCostModel::setTailFoldingStyles(), and llvm::VPRecipeBuilder::tryToCreateWidenRecipe().

◆ getRuntimePointerChecking()

const RuntimePointerChecking * llvm::LoopVectorizationLegality::getRuntimePointerChecking ( ) const

inline

Returns the information that we collected about runtime memory check.

Definition at line 363 of file LoopVectorizationLegality.h.

References llvm::LoopAccessInfo::getRuntimePointerChecking().

Referenced by llvm::LoopVectorizationCostModel::computeMaxVF(), llvm::LoopVectorizationCostModel::runtimeChecksRequired(), and llvm::LoopVectorizationCostModel::selectInterleaveCount().

◆ getScalarEvolution()

ScalarEvolution * llvm::LoopVectorizationLegality::getScalarEvolution ( ) const

inline

Definition at line 400 of file LoopVectorizationLegality.h.

References llvm::PredicatedScalarEvolution::getSE().

Referenced by llvm::ARMTTIImpl::preferPredicateOverEpilogue().

◆ getWidestInductionType()

Type * llvm::LoopVectorizationLegality::getWidestInductionType ( )

inline

Returns the widest induction type.

Definition at line 296 of file LoopVectorizationLegality.h.

Referenced by llvm::LoopVectorizationPlanner::selectEpilogueVectorizationFactor().

◆ hasVectorCallVariants()

bool llvm::LoopVectorizationLegality::hasVectorCallVariants ( ) const

inline

Returns true if there is at least one function call in the loop which has a vectorized variant available.

Definition at line 385 of file LoopVectorizationLegality.h.

◆ isCastedInductionVariable()

bool llvm::LoopVectorizationLegality::isCastedInductionVariable ( const Value * V ) const

Returns True if V is a cast that is part of an induction def-use chain, and had been proven to be redundant under a runtime guard (in other words, the cast has the same SCEV expression as the induction phi).

Definition at line 1229 of file LoopVectorizationLegality.cpp.

References llvm::SmallPtrSetImpl< PtrType >::count().

Referenced by isInductionVariable().

◆ isConsecutivePtr()

int llvm::LoopVectorizationLegality::isConsecutivePtr	(	Type *	AccessTy,
		Value *	Ptr
	)		const

Check if this pointer is consecutive when vectorizing.

This happens when the last index of the GEP is the induction variable, or that the pointer itself is an induction variable. This check allows us to vectorize A[idx] into a wide load/store. Returns: 0 - Stride is unknown or non-consecutive. 1 - Address is consecutive. -1 - Address is consecutive, and decreasing. NOTE: This method must only be used before modifying the original scalar loop. Do not use after invoking 'createVectorizedLoopSkeleton' (PR34965).

Definition at line 453 of file LoopVectorizationLegality.cpp.

References F, llvm::LoopBase< BlockT, LoopT >::getHeader(), llvm::BasicBlock::getParent(), llvm::getPtrStride(), llvm::LoopAccessInfo::getSymbolicStrides(), llvm::IRPass, Ptr, and llvm::shouldOptimizeForSize().

Referenced by llvm::LoopVectorizationCostModel::isLegalMaskedLoad(), llvm::LoopVectorizationCostModel::isLegalMaskedStore(), llvm::LoopVectorizationCostModel::memoryInstructionCanBeWidened(), and llvm::LoopVectorizationCostModel::setCostBasedWideningDecision().

◆ isFixedOrderRecurrence()

bool llvm::LoopVectorizationLegality::isFixedOrderRecurrence ( const PHINode * Phi ) const

Returns True if Phi is a fixed-order recurrence in this loop.

Definition at line 1239 of file LoopVectorizationLegality.cpp.

References llvm::SmallPtrSetImpl< PtrType >::count().

Referenced by llvm::VPRecipeBuilder::tryToCreateWidenRecipe().

◆ isInductionPhi()

bool llvm::LoopVectorizationLegality::isInductionPhi ( const Value * V ) const

Returns True if V is a Phi node of an induction variable in this loop.

Definition at line 1199 of file LoopVectorizationLegality.cpp.

References llvm::MapVector< KeyT, ValueT, MapType, VectorType >::count().

Referenced by getIntOrFpInductionDescriptor(), getPointerInductionDescriptor(), isInductionVariable(), and llvm::LoopVectorizationCostModel::isOptimizableIVTruncate().

◆ isInductionVariable()

bool llvm::LoopVectorizationLegality::isInductionVariable ( const Value * V ) const

Returns True if V can be considered as an induction variable in this loop.

V can be the induction phi, or some redundant cast in the def-use chain of the inducion phi.

Definition at line 1235 of file LoopVectorizationLegality.cpp.

References isCastedInductionVariable(), and isInductionPhi().

◆ isInvariant()

bool llvm::LoopVectorizationLegality::isInvariant ( Value * V ) const

Returns true if value V is uniform across VF lanes, when VF is provided, and otherwise if V is invariant across all loop iterations.

Definition at line 474 of file LoopVectorizationLegality.cpp.

References llvm::LoopAccessInfo::isInvariant().

Referenced by llvm::LoopVectorizationCostModel::getDivRemSpeculationCost(), llvm::LoopVectorizationCostModel::isPredicatedInst(), and isUniform().

◆ isInvariantAddressOfReduction()

bool llvm::LoopVectorizationLegality::isInvariantAddressOfReduction ( Value * V )

Returns True if given address is invariant and is used to store recurrent expression.

Definition at line 1186 of file LoopVectorizationLegality.cpp.

References llvm::any_of(), llvm::StoreInst::getPointerOperand(), getReductionVars(), llvm::ScalarEvolution::getSCEV(), llvm::PredicatedScalarEvolution::getSE(), llvm::RecurrenceDescriptor::IntermediateStore, and Reduction.

Referenced by llvm::LoopVectorizationCostModel::collectValuesToIgnore().

◆ isInvariantStoreOfReduction()

bool llvm::LoopVectorizationLegality::isInvariantStoreOfReduction ( StoreInst * SI )

Returns True if given store is a final invariant store of one of the reductions found in the loop.

Definition at line 1179 of file LoopVectorizationLegality.cpp.

References llvm::any_of(), getReductionVars(), llvm::RecurrenceDescriptor::IntermediateStore, and Reduction.

◆ isMaskRequired()

bool llvm::LoopVectorizationLegality::isMaskRequired ( const Instruction * I ) const

inline

Returns true if vector representation of the instruction I requires mask.

Definition at line 379 of file LoopVectorizationLegality.h.

References I.

Referenced by llvm::LoopVectorizationCostModel::interleavedAccessCanBeWidened(), llvm::LoopVectorizationCostModel::isPredicatedInst(), and llvm::LoopVectorizationCostModel::setVectorizedCallDecision().

◆ isReductionVariable()

bool llvm::LoopVectorizationLegality::isReductionVariable ( PHINode * PN ) const

inline

Returns True if PN is a reduction variable in this loop.

Definition at line 328 of file LoopVectorizationLegality.h.

References llvm::MapVector< KeyT, ValueT, MapType, VectorType >::count().

Referenced by llvm::LoopVectorizationCostModel::collectElementTypesForWidening(), and llvm::VPRecipeBuilder::tryToCreateWidenRecipe().

◆ isSafeForAnyVectorWidth()

bool llvm::LoopVectorizationLegality::isSafeForAnyVectorWidth ( ) const

inline

Definition at line 369 of file LoopVectorizationLegality.h.

References llvm::LoopAccessInfo::getDepChecker(), and llvm::MemoryDepChecker::isSafeForAnyVectorWidth().

Referenced by llvm::LoopVectorizationCostModel::selectInterleaveCount(), and llvm::LoopVectorizationCostModel::setTailFoldingStyles().

◆ isUniform()

bool llvm::LoopVectorizationLegality::isUniform	(	Value *	V,
		ElementCount	VF
	)		const

Returns true if value V is uniform across VF lanes, when VF is provided, and otherwise if V is invariant across all loop iterations.

Definition at line 568 of file LoopVectorizationLegality.cpp.

References llvm::all_of(), llvm::details::FixedOrScalableQuantity< LeafTy, ValueTy >::getKnownMinValue(), llvm::ScalarEvolution::getSCEV(), llvm::PredicatedScalarEvolution::getSE(), I, isInvariant(), llvm::details::FixedOrScalableQuantity< LeafTy, ValueTy >::isScalable(), llvm::ElementCount::isScalar(), llvm::ScalarEvolution::isSCEVable(), and llvm::reverse().

Referenced by isUniformMemOp().

◆ isUniformMemOp()

bool llvm::LoopVectorizationLegality::isUniformMemOp	(	Instruction &	I,
		ElementCount	VF
	)		const

A uniform memory op is a load or store which accesses the same memory location on all VF lanes, if VF is provided and otherwise if the memory location is invariant.

Definition at line 601 of file LoopVectorizationLegality.cpp.

References blockNeedsPredication(), llvm::getLoadStorePointerOperand(), I, isUniform(), and Ptr.

Referenced by llvm::LoopVectorizationCostModel::setCostBasedWideningDecision().

◆ prepareToFoldTailByMasking()

bool llvm::LoopVectorizationLegality::prepareToFoldTailByMasking ( )

Return true if we can vectorize this loop while folding its tail by masking, and mark all respective loads/stores for masking.

This object's state is only modified iff this function returns true.

Definition at line 1528 of file LoopVectorizationLegality.cpp.

References llvm::SmallPtrSetImpl< PtrType >::begin(), llvm::LoopBase< BlockT, LoopT >::blocks(), llvm::LoopBase< BlockT, LoopT >::contains(), llvm::SmallPtrSetImpl< PtrType >::count(), llvm::dbgs(), llvm::SmallPtrSetImpl< PtrType >::end(), getInductionVars(), getReductionVars(), llvm::SmallPtrSetImpl< PtrType >::insert(), LLVM_DEBUG, Reduction, and llvm::Value::users().

Referenced by llvm::LoopVectorizationCostModel::setTailFoldingStyles().

The documentation for this class was generated from the following files:

include/llvm/Transforms/Vectorize/LoopVectorizationLegality.h
lib/Transforms/Vectorize/LoopVectorizationLegality.cpp

Public Types

Public Member Functions

Detailed Description

Member Typedef Documentation

◆ InductionList

◆ RecurrenceSet

◆ ReductionList

Constructor & Destructor Documentation

◆ LoopVectorizationLegality()

Member Function Documentation

◆ blockNeedsPredication()

◆ canVectorize()

◆ canVectorizeFPMath()

◆ getAssumptionCache()

◆ getDominatorTree()

◆ getFixedOrderRecurrences()

◆ getInductionVars()

◆ getIntOrFpInductionDescriptor()

◆ getLAI()

◆ getLoop()

◆ getLoopInfo()

◆ getMaxSafeVectorWidthInBits()

◆ getNumLoads()

◆ getNumStores()

◆ getPointerInductionDescriptor()

◆ getPredicatedScalarEvolution()

◆ getPrimaryInduction()

◆ getReductionVars()

◆ getRuntimePointerChecking()

◆ getScalarEvolution()

◆ getWidestInductionType()

◆ hasVectorCallVariants()

◆ isCastedInductionVariable()

◆ isConsecutivePtr()

◆ isFixedOrderRecurrence()

◆ isInductionPhi()

◆ isInductionVariable()

◆ isInvariant()

◆ isInvariantAddressOfReduction()

◆ isInvariantStoreOfReduction()

◆ isMaskRequired()

◆ isReductionVariable()

◆ isSafeForAnyVectorWidth()

◆ isUniform()

◆ isUniformMemOp()

◆ prepareToFoldTailByMasking()