LLVM  16.0.0git
Public Member Functions | Protected Member Functions | List of all members
llvm::EpilogueVectorizerEpilogueLoop Class Reference
Inheritance diagram for llvm::EpilogueVectorizerEpilogueLoop:
Inheritance graph
[legend]
Collaboration diagram for llvm::EpilogueVectorizerEpilogueLoop:
Collaboration graph
[legend]

Public Member Functions

 EpilogueVectorizerEpilogueLoop (Loop *OrigLoop, PredicatedScalarEvolution &PSE, LoopInfo *LI, DominatorTree *DT, const TargetLibraryInfo *TLI, const TargetTransformInfo *TTI, AssumptionCache *AC, OptimizationRemarkEmitter *ORE, EpilogueLoopVectorizationInfo &EPI, LoopVectorizationLegality *LVL, llvm::LoopVectorizationCostModel *CM, BlockFrequencyInfo *BFI, ProfileSummaryInfo *PSI, GeneratedRTChecks &Checks)
 
std::pair< BasicBlock *, Value * > createEpilogueVectorizedLoopSkeleton () final
 Implements the interface for creating a vectorized skeleton using the epilogue loop strategy (ie the second pass of vplan execution). More...
 
- Public Member Functions inherited from llvm::InnerLoopAndEpilogueVectorizer
 InnerLoopAndEpilogueVectorizer (Loop *OrigLoop, PredicatedScalarEvolution &PSE, LoopInfo *LI, DominatorTree *DT, const TargetLibraryInfo *TLI, const TargetTransformInfo *TTI, AssumptionCache *AC, OptimizationRemarkEmitter *ORE, EpilogueLoopVectorizationInfo &EPI, LoopVectorizationLegality *LVL, llvm::LoopVectorizationCostModel *CM, BlockFrequencyInfo *BFI, ProfileSummaryInfo *PSI, GeneratedRTChecks &Checks)
 
std::pair< BasicBlock *, Value * > createVectorizedLoopSkeleton () final
 Create a new empty loop that will contain vectorized instructions later on, while the old loop will be used as the scalar remainder. More...
 
- Public Member Functions inherited from llvm::InnerLoopVectorizer
 InnerLoopVectorizer (Loop *OrigLoop, PredicatedScalarEvolution &PSE, LoopInfo *LI, DominatorTree *DT, const TargetLibraryInfo *TLI, const TargetTransformInfo *TTI, AssumptionCache *AC, OptimizationRemarkEmitter *ORE, ElementCount VecWidth, ElementCount MinProfitableTripCount, unsigned UnrollFactor, LoopVectorizationLegality *LVL, LoopVectorizationCostModel *CM, BlockFrequencyInfo *BFI, ProfileSummaryInfo *PSI, GeneratedRTChecks &RTChecks)
 
virtual ~InnerLoopVectorizer ()=default
 
void fixVectorizedLoop (VPTransformState &State, VPlan &Plan)
 Fix the vectorized code, taking care of header phi's, live-outs, and more. More...
 
bool areSafetyChecksAdded ()
 
void scalarizeInstruction (const Instruction *Instr, VPReplicateRecipe *RepRecipe, const VPIteration &Instance, bool IfPredicateInstr, VPTransformState &State)
 A helper function to scalarize a single Instruction in the innermost loop. More...
 
void packScalarIntoVectorValue (VPValue *Def, const VPIteration &Instance, VPTransformState &State)
 Construct the vector value of a scalarized value V one lane at a time. More...
 
void vectorizeInterleaveGroup (const InterleaveGroup< Instruction > *Group, ArrayRef< VPValue * > VPDefs, VPTransformState &State, VPValue *Addr, ArrayRef< VPValue * > StoredValues, VPValue *BlockInMask=nullptr)
 Try to vectorize interleaved access group Group with the base address given in Addr, optionally masking the vector operations if BlockInMask is non-null. More...
 
void fixNonInductionPHIs (VPlan &Plan, VPTransformState &State)
 Fix the non-induction PHIs in Plan. More...
 
bool useOrderedReductions (const RecurrenceDescriptor &RdxDesc)
 Returns true if the reordering of FP operations is not allowed, but we are able to vectorize with strict in-order reductions for the given RdxDesc. More...
 
virtual ValuegetBroadcastInstrs (Value *V)
 Create a broadcast instruction. More...
 
PHINodegetReductionResumeValue (const RecurrenceDescriptor &RdxDesc)
 
PHINodecreateInductionResumeValue (PHINode *OrigPhi, const InductionDescriptor &ID, ArrayRef< BasicBlock * > BypassBlocks, std::pair< BasicBlock *, Value * > AdditionalBypass={nullptr, nullptr})
 Create a new phi node for the induction variable OrigPhi to resume iteration count in the scalar epilogue, from where the vectorized loop left off. More...
 

Protected Member Functions

BasicBlockemitMinimumVectorEpilogueIterCountCheck (BasicBlock *Bypass, BasicBlock *Insert)
 Emits an iteration count bypass check after the main vector loop has finished to see if there are any iterations left to execute by either the vector epilogue or the scalar epilogue. More...
 
void printDebugTracesAtStart () override
 Allow subclasses to override and print debug traces before/after vplan execution, when trace information is requested. More...
 
void printDebugTracesAtEnd () override
 
- Protected Member Functions inherited from llvm::InnerLoopVectorizer
void fixupIVUsers (PHINode *OrigPhi, const InductionDescriptor &II, Value *VectorTripCount, Value *EndValue, BasicBlock *MiddleBlock, BasicBlock *VectorHeader, VPlan &Plan)
 Set up the values of the IVs correctly when exiting the vector loop. More...
 
void fixCrossIterationPHIs (VPTransformState &State)
 Handle all cross-iteration phis in the header. More...
 
void fixFixedOrderRecurrence (VPFirstOrderRecurrencePHIRecipe *PhiR, VPTransformState &State)
 Create the exit value of first order recurrences in the middle block and update their users. More...
 
void fixReduction (VPReductionPHIRecipe *Phi, VPTransformState &State)
 Create code for the loop exit value of the reduction. More...
 
void clearReductionWrapFlags (VPReductionPHIRecipe *PhiR, VPTransformState &State)
 Clear NSW/NUW flags from reduction instructions if necessary. More...
 
void sinkScalarOperands (Instruction *PredInst)
 Iteratively sink the scalarized operands of a predicated instruction into the block that was created for it. More...
 
void truncateToMinimalBitwidths (VPTransformState &State)
 Shrinks vector element sizes to the smallest bitwidth they can be legally represented as. More...
 
ValuegetOrCreateTripCount (BasicBlock *InsertBlock)
 Returns (and creates if needed) the original loop trip count. More...
 
ValuegetOrCreateVectorTripCount (BasicBlock *InsertBlock)
 Returns (and creates if needed) the trip count of the widened loop. More...
 
ValuecreateBitOrPointerCast (Value *V, VectorType *DstVTy, const DataLayout &DL)
 Returns a bitcasted value to the requested vector type. More...
 
void emitIterationCountCheck (BasicBlock *Bypass)
 Emit a bypass check to see if the vector trip count is zero, including if it overflows. More...
 
BasicBlockemitSCEVChecks (BasicBlock *Bypass)
 Emit a bypass check to see if all of the SCEV assumptions we've had to make are correct. More...
 
BasicBlockemitMemRuntimeChecks (BasicBlock *Bypass)
 Emit bypass checks to check any memory assumptions we may have made. More...
 
void createVectorLoopSkeleton (StringRef Prefix)
 Emit basic blocks (prefixed with Prefix) for the iteration check, vector loop preheader, middle block and scalar preheader. More...
 
void createInductionResumeValues (std::pair< BasicBlock *, Value * > AdditionalBypass={nullptr, nullptr})
 Create new phi nodes for the induction variables to resume iteration count in the scalar epilogue, from where the vectorized loop left off. More...
 
BasicBlockcompleteLoopSkeleton ()
 Complete the loop skeleton by adding debug MDs, creating appropriate conditional branches in the middle block, preparing the builder and running the verifier. More...
 
void collectPoisonGeneratingRecipes (VPTransformState &State)
 Collect poison-generating recipes that may generate a poison value that is used after vectorization, even when their operands are not poison. More...
 

Additional Inherited Members

- Public Types inherited from llvm::InnerLoopVectorizer
using VectorParts = SmallVector< Value *, 2 >
 A type for vectorized values in the new loop. More...
 
- Public Attributes inherited from llvm::InnerLoopAndEpilogueVectorizer
EpilogueLoopVectorizationInfoEPI
 Holds and updates state information required to vectorize the main loop and its epilogue in two separate passes. More...
 
- Protected Types inherited from llvm::InnerLoopVectorizer
using PhiVector = SmallVector< PHINode *, 4 >
 A small list of PHINodes. More...
 
using ScalarParts = SmallVector< SmallVector< Value *, 4 >, 2 >
 A type for scalarized values in the new loop. More...
 
- Protected Attributes inherited from llvm::InnerLoopVectorizer
LoopOrigLoop
 The original loop. More...
 
PredicatedScalarEvolutionPSE
 A wrapper around ScalarEvolution used to add runtime SCEV checks. More...
 
LoopInfoLI
 Loop Info. More...
 
DominatorTreeDT
 Dominator Tree. More...
 
AAResultsAA
 Alias Analysis. More...
 
const TargetLibraryInfoTLI
 Target Library Info. More...
 
const TargetTransformInfoTTI
 Target Transform Info. More...
 
AssumptionCacheAC
 Assumption Cache. More...
 
OptimizationRemarkEmitterORE
 Interface to emit optimization remarks. More...
 
ElementCount VF
 The vectorization SIMD factor to use. More...
 
ElementCount MinProfitableTripCount
 
unsigned UF
 The vectorization unroll factor to use. More...
 
IRBuilder Builder
 The builder that we use. More...
 
BasicBlockLoopVectorPreHeader
 The vector-loop preheader. More...
 
BasicBlockLoopScalarPreHeader
 The scalar-loop preheader. More...
 
BasicBlockLoopMiddleBlock
 Middle Block between the vector and the scalar. More...
 
BasicBlockLoopExitBlock
 The unique ExitBlock of the scalar loop if one exists. More...
 
BasicBlockLoopScalarBody
 The scalar loop body. More...
 
SmallVector< BasicBlock *, 4 > LoopBypassBlocks
 A list of all bypass blocks. The first block is the entry of the loop. More...
 
SmallVector< Instruction *, 4 > PredicatedInstructions
 Store instructions that were predicated. More...
 
ValueTripCount = nullptr
 Trip count of the original loop. More...
 
ValueVectorTripCount = nullptr
 Trip count of the widened loop (TripCount - TripCount % (VF*UF)) More...
 
LoopVectorizationLegalityLegal
 The legality analysis. More...
 
LoopVectorizationCostModelCost
 The profitablity analysis. More...
 
bool AddedSafetyChecks = false
 
DenseMap< PHINode *, Value * > IVEndValues
 
BlockFrequencyInfoBFI
 BFI and PSI are used to check for profile guided size optimizations. More...
 
ProfileSummaryInfoPSI
 
bool OptForSizeBasedOnProfile
 
GeneratedRTChecksRTChecks
 Structure to hold information about generated runtime checks, responsible for cleaning the checks, if vectorization turns out unprofitable. More...
 
SmallMapVector< const RecurrenceDescriptor *, PHINode *, 4 > ReductionResumeValues
 

Detailed Description

Definition at line 865 of file LoopVectorize.cpp.

Constructor & Destructor Documentation

◆ EpilogueVectorizerEpilogueLoop()

llvm::EpilogueVectorizerEpilogueLoop::EpilogueVectorizerEpilogueLoop ( Loop OrigLoop,
PredicatedScalarEvolution PSE,
LoopInfo LI,
DominatorTree DT,
const TargetLibraryInfo TLI,
const TargetTransformInfo TTI,
AssumptionCache AC,
OptimizationRemarkEmitter ORE,
EpilogueLoopVectorizationInfo EPI,
LoopVectorizationLegality LVL,
llvm::LoopVectorizationCostModel CM,
BlockFrequencyInfo BFI,
ProfileSummaryInfo PSI,
GeneratedRTChecks Checks 
)
inline

Member Function Documentation

◆ createEpilogueVectorizedLoopSkeleton()

std::pair< BasicBlock *, Value * > EpilogueVectorizerEpilogueLoop::createEpilogueVectorizedLoopSkeleton ( )
finalvirtual

Implements the interface for creating a vectorized skeleton using the epilogue loop strategy (ie the second pass of vplan execution).

This function is partially responsible for generating the control flow depicted in https://llvm.org/docs/Vectorizers.html#epilogue-vectorization.

Implements llvm::InnerLoopAndEpilogueVectorizer.

Definition at line 7856 of file LoopVectorize.cpp.

References llvm::PHINode::addIncoming(), assert(), llvm::DominatorTreeBase< NodeT, IsPostDom >::changeImmediateDominator(), llvm::InnerLoopVectorizer::completeLoopSkeleton(), llvm::InnerLoopVectorizer::Cost, llvm::PHINode::Create(), llvm::InnerLoopVectorizer::createInductionResumeValues(), llvm::InnerLoopVectorizer::createVectorLoopSkeleton(), llvm::InnerLoopVectorizer::DT, llvm::InnerLoopAndEpilogueVectorizer::EPI, llvm::EpilogueLoopVectorizationInfo::EpilogueIterationCountCheck, llvm::EpilogueLoopVectorizationInfo::EpilogueVF, llvm::ConstantInt::get(), llvm::BasicBlock::getFirstNonPHI(), llvm::BasicBlock::getSinglePredecessor(), llvm::BasicBlock::getTerminator(), llvm::LoopVectorizationLegality::getWidestInductionType(), llvm::InnerLoopVectorizer::Legal, llvm::InnerLoopVectorizer::LI, llvm::InnerLoopVectorizer::LoopBypassBlocks, llvm::InnerLoopVectorizer::LoopExitBlock, llvm::InnerLoopVectorizer::LoopScalarPreHeader, llvm::InnerLoopVectorizer::LoopVectorPreHeader, llvm::EpilogueLoopVectorizationInfo::MainLoopIterationCountCheck, llvm::EpilogueLoopVectorizationInfo::MemSafetyCheck, llvm::Instruction::moveBefore(), llvm::BasicBlock::phis(), llvm::PHINode::removeIncomingValue(), llvm::PHINode::replaceIncomingBlockWith(), llvm::User::replaceUsesOfWith(), llvm::LoopVectorizationCostModel::requiresScalarEpilogue(), llvm::EpilogueLoopVectorizationInfo::SCEVSafetyCheck, llvm::Value::setName(), llvm::SplitBlock(), and llvm::EpilogueLoopVectorizationInfo::VectorTripCount.

◆ emitMinimumVectorEpilogueIterCountCheck()

BasicBlock * EpilogueVectorizerEpilogueLoop::emitMinimumVectorEpilogueIterCountCheck ( BasicBlock Bypass,
BasicBlock Insert 
)
protected

◆ printDebugTracesAtEnd()

void EpilogueVectorizerEpilogueLoop::printDebugTracesAtEnd ( )
overrideprotectedvirtual

◆ printDebugTracesAtStart()

void EpilogueVectorizerEpilogueLoop::printDebugTracesAtStart ( )
overrideprotectedvirtual

Allow subclasses to override and print debug traces before/after vplan execution, when trace information is requested.

Reimplemented from llvm::InnerLoopVectorizer.

Definition at line 7984 of file LoopVectorize.cpp.

References llvm::dbgs(), llvm::InnerLoopAndEpilogueVectorizer::EPI, llvm::EpilogueLoopVectorizationInfo::EpilogueUF, llvm::EpilogueLoopVectorizationInfo::EpilogueVF, and LLVM_DEBUG.


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