VPlanTransforms.cpp File Reference

This file implements a set of utility VPlan to VPlan transformations. More...

#include "VPlanTransforms.h"
#include "VPRecipeBuilder.h"
#include "VPlan.h"
#include "VPlanAnalysis.h"
#include "VPlanCFG.h"
#include "VPlanDominatorTree.h"
#include "VPlanPatternMatch.h"
#include "VPlanUtils.h"
#include "llvm/ADT/PostOrderIterator.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/TypeSwitch.h"
#include "llvm/Analysis/IVDescriptors.h"
#include "llvm/Analysis/VectorUtils.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/PatternMatch.h"

Go to the source code of this file.

Functions
static bool	sinkScalarOperands (VPlan &Plan)
VPValue *	getPredicatedMask (VPRegionBlock *R)
	If R is a region with a VPBranchOnMaskRecipe in the entry block, return the mask.
static VPBasicBlock *	getPredicatedThenBlock (VPRegionBlock *R)
	If R is a triangle region, return the 'then' block of the triangle.
static bool	mergeReplicateRegionsIntoSuccessors (VPlan &Plan)
static VPRegionBlock *	createReplicateRegion (VPReplicateRecipe *PredRecipe, VPlan &Plan)
static void	addReplicateRegions (VPlan &Plan)
static bool	mergeBlocksIntoPredecessors (VPlan &Plan)
	Remove redundant VPBasicBlocks by merging them into their predecessor if the predecessor has a single successor.
static void	removeRedundantInductionCasts (VPlan &Plan)
	Remove redundant casts of inductions.
static void	removeRedundantCanonicalIVs (VPlan &Plan)
	Try to replace VPWidenCanonicalIVRecipes with a widened canonical IV recipe, if it exists.
static bool	isDeadRecipe (VPRecipeBase &R)
	Returns true if R is dead and can be removed.
static VPScalarIVStepsRecipe *	createScalarIVSteps (VPlan &Plan, InductionDescriptor::InductionKind Kind, Instruction::BinaryOps InductionOpcode, FPMathOperator *FPBinOp, Instruction *TruncI, VPValue *StartV, VPValue *Step, VPBuilder &Builder)
static void	legalizeAndOptimizeInductions (VPlan &Plan)
	Legalize VPWidenPointerInductionRecipe, by replacing it with a PtrAdd (IndStart, ScalarIVSteps (0, Step)) if only its scalar values are used, as VPWidenPointerInductionRecipe will generate vectors only.
static void	removeRedundantExpandSCEVRecipes (VPlan &Plan)
	Remove redundant EpxandSCEVRecipes in Plan's entry block by replacing them with already existing recipes expanding the same SCEV expression.
static void	recursivelyDeleteDeadRecipes (VPValue *V)
static bool	sinkRecurrenceUsersAfterPrevious (VPFirstOrderRecurrencePHIRecipe *FOR, VPRecipeBase *Previous, VPDominatorTree &VPDT)
	Sink users of FOR after the recipe defining the previous value Previous of the recurrence.
static bool	hoistPreviousBeforeFORUsers (VPFirstOrderRecurrencePHIRecipe *FOR, VPRecipeBase *Previous, VPDominatorTree &VPDT)
	Try to hoist Previous and its operands before all users of FOR.
static SmallVector< VPUser * >	collectUsersRecursively (VPValue *V)
static void	simplifyRecipe (VPRecipeBase &R, VPTypeAnalysis &TypeInfo)
	Try to simplify recipe R.
static void	licm (VPlan &Plan)
	Move loop-invariant recipes out of the vector loop region in Plan.
static void	simplifyRecipes (VPlan &Plan)
	Try to simplify the recipes in Plan.
static VPActiveLaneMaskPHIRecipe *	addVPLaneMaskPhiAndUpdateExitBranch (VPlan &Plan, bool DataAndControlFlowWithoutRuntimeCheck)
static SmallVector< VPValue * >	collectAllHeaderMasks (VPlan &Plan)
	Collect all VPValues representing a header mask through the (ICMP_ULE, WideCanonicalIV, backedge-taken-count) pattern.
static void	transformRecipestoEVLRecipes (VPlan &Plan, VPValue &EVL)
	Replace recipes with their EVL variants.

Detailed Description

This file implements a set of utility VPlan to VPlan transformations.

Definition in file VPlanTransforms.cpp.

Function Documentation

addReplicateRegions()

static void addReplicateRegions ( VPlan &  Plan )

static

Definition at line 341 of file VPlanTransforms.cpp.

References createReplicateRegion(), llvm::VPlan::getEntry(), llvm::Value::getName(), llvm::VPBlockBase::getParent(), llvm::BasicBlock::getParent(), llvm::Value::hasName(), llvm::VPBlockUtils::insertOnEdge(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::Value::setName(), llvm::VPBasicBlock::splitAt(), llvm::SplitBlock(), and llvm::vp_depth_first_deep().

Referenced by llvm::VPlanTransforms::createAndOptimizeReplicateRegions().

addVPLaneMaskPhiAndUpdateExitBranch()

static VPActiveLaneMaskPHIRecipe * addVPLaneMaskPhiAndUpdateExitBranch ( VPlan &  Plan, bool  DataAndControlFlowWithoutRuntimeCheck  )

static

Definition at line 1296 of file VPlanTransforms.cpp.

References llvm::VPInstruction::ActiveLaneMask, llvm::VPUser::addOperand(), llvm::VPInstruction::BranchOnCond, llvm::VPInstruction::CalculateTripCountMinusVF, llvm::VPInstruction::CanonicalIVIncrementForPart, llvm::VPBuilder::createNaryOp(), llvm::VPBuilder::createNot(), llvm::VPBuilder::createOverflowingOp(), llvm::DataAndControlFlowWithoutRuntimeCheck, DL, llvm::VPRecipeBase::eraseFromParent(), llvm::VPlan::getCanonicalIV(), llvm::VPBlockBase::getExitingBasicBlock(), llvm::VPBasicBlock::getTerminator(), llvm::VPlan::getTripCount(), llvm::VPlan::getVectorLoopRegion(), llvm::VPlan::getVectorPreheader(), and llvm::VPBuilder::setInsertPoint().

Referenced by llvm::VPlanTransforms::addActiveLaneMask().

collectAllHeaderMasks()

static SmallVector< VPValue * > collectAllHeaderMasks ( VPlan &  Plan )

static

Collect all VPValues representing a header mask through the (ICMP_ULE, WideCanonicalIV, backedge-taken-count) pattern.

TODO: Introduce explicit recipe for header-mask instead of searching for the header-mask pattern manually.

Definition at line 1371 of file VPlanTransforms.cpp.

References assert(), llvm::count_if(), llvm::iterator_range< IteratorT >::end(), llvm::find_if(), llvm::VPlan::getCanonicalIV(), llvm::VPBlockBase::getEntryBasicBlock(), llvm::VPlan::getVectorLoopRegion(), llvm::vputils::isHeaderMask(), llvm::VPBasicBlock::phis(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), and llvm::VPValue::users().

Referenced by llvm::VPlanTransforms::addActiveLaneMask(), and transformRecipestoEVLRecipes().

collectUsersRecursively()

static SmallVector< VPUser * > collectUsersRecursively ( VPValue *  V )

static

Definition at line 915 of file VPlanTransforms.cpp.

References llvm::VPDef::definedValues(), I, and Users.

Referenced by llvm::VPlanTransforms::clearReductionWrapFlags(), and transformRecipestoEVLRecipes().

createReplicateRegion()

static VPRegionBlock * createReplicateRegion ( VPReplicateRecipe *  PredRecipe, VPlan &  Plan  )

static

Definition at line 305 of file VPlanTransforms.cpp.

References assert(), llvm::VPBlockUtils::connectBlocks(), llvm::VPRecipeBase::eraseFromParent(), llvm::VPReplicateRecipe::getMask(), llvm::VPValue::getNumUsers(), llvm::VPSingleDefRecipe::getUnderlyingInstr(), llvm::VPBlockUtils::insertTwoBlocksAfter(), llvm::VPReplicateRecipe::isUniform(), llvm::make_range(), llvm::VPUser::op_begin(), llvm::VPUser::op_end(), llvm::VPValue::replaceAllUsesWith(), and llvm::VPUser::setOperand().

Referenced by addReplicateRegions().

createScalarIVSteps()

static VPScalarIVStepsRecipe * createScalarIVSteps ( VPlan &  Plan, InductionDescriptor::InductionKind  Kind, Instruction::BinaryOps  InductionOpcode, FPMathOperator *  FPBinOp, Instruction *  TruncI, VPValue *  StartV, VPValue *  Step, VPBuilder &  Builder  )

static

Definition at line 524 of file VPlanTransforms.cpp.

References assert(), llvm::VPBuilder::createDerivedIV(), llvm::VPBuilder::createScalarCast(), llvm::VPBuilder::createScalarIVSteps(), llvm::VPlan::getCanonicalIV(), llvm::VPBlockBase::getEntryBasicBlock(), llvm::Type::getScalarSizeInBits(), llvm::VPCanonicalIVPHIRecipe::getScalarType(), llvm::VPBlockBase::getSingleHierarchicalPredecessor(), llvm::Value::getType(), llvm::VPlan::getVectorLoopRegion(), llvm::VPTypeAnalysis::inferScalarType(), llvm::VPCanonicalIVPHIRecipe::isCanonical(), llvm::Type::isIntegerTy(), and llvm::VPBuilder::setInsertPoint().

Referenced by legalizeAndOptimizeInductions().

getPredicatedMask()

VPValue * getPredicatedMask

(

VPRegionBlock *

R

)

If R is a region with a VPBranchOnMaskRecipe in the entry block, return the mask.

Definition at line 187 of file VPlanTransforms.cpp.

Referenced by mergeReplicateRegionsIntoSuccessors().

getPredicatedThenBlock()

static VPBasicBlock * getPredicatedThenBlock ( VPRegionBlock *  R )

static

If R is a triangle region, return the 'then' block of the triangle.

Definition at line 197 of file VPlanTransforms.cpp.

Referenced by mergeReplicateRegionsIntoSuccessors().

hoistPreviousBeforeFORUsers()

static bool hoistPreviousBeforeFORUsers ( VPFirstOrderRecurrencePHIRecipe *  FOR, VPRecipeBase *  Previous, VPDominatorTree &  VPDT  )

static

Try to hoist Previous and its operands before all users of FOR.

Definition at line 771 of file VPlanTransforms.cpp.

References A, llvm::all_of(), assert(), B, llvm::VPBasicBlock::getEnclosingLoopRegion(), llvm::ilist_node_impl< OptionsT >::getIterator(), llvm::VPDef::getNumDefinedValues(), llvm::VPBlockBase::getParent(), llvm::VPRecipeBase::getParent(), llvm::VPDef::getVPSingleValue(), I, llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::VPRecipeBase::mayHaveSideEffects(), llvm::VPRecipeBase::mayReadFromMemory(), llvm::VPUser::operands(), llvm::VPDominatorTree::properlyDominates(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::SmallVectorBase< Size_T >::size(), and llvm::sort().

Referenced by llvm::VPlanTransforms::adjustFixedOrderRecurrences().

isDeadRecipe()

static bool isDeadRecipe ( VPRecipeBase &  R )

static

Returns true if R is dead and can be removed.

Definition at line 490 of file VPlanTransforms.cpp.

References llvm::all_of(), and llvm::PatternMatch::match().

Referenced by recursivelyDeleteDeadRecipes(), and llvm::VPlanTransforms::removeDeadRecipes().

legalizeAndOptimizeInductions()

static void legalizeAndOptimizeInductions ( VPlan &  Plan )

static

Legalize VPWidenPointerInductionRecipe, by replacing it with a PtrAdd (IndStart, ScalarIVSteps (0, Step)) if only its scalar values are used, as VPWidenPointerInductionRecipe will generate vectors only.

If some users require vectors while other require scalars, the scalar uses need to extract the scalars from the generated vectors (Note that this is different to how int/fp inductions are handled). Also optimize VPWidenIntOrFpInductionRecipe, if any of its users needs scalar values, by providing them scalar steps built on the canonical scalar IV and update the original IV's users. This is an optional optimization to reduce the needs of vector extracts.

Definition at line 573 of file VPlanTransforms.cpp.

References llvm::VPBuilder::createPtrAdd(), createScalarIVSteps(), llvm::VPRecipeBase::getDebugLoc(), llvm::VPBlockBase::getEntryBasicBlock(), llvm::VPBasicBlock::getFirstNonPhi(), llvm::ElementCount::getFixed(), llvm::VPlan::getOrAddLiveIn(), llvm::VPlan::getVectorLoopRegion(), llvm::VPlan::hasScalableVF(), llvm::VPlan::hasVF(), llvm::InductionDescriptor::IK_IntInduction, llvm::none_of(), llvm::VPBasicBlock::phis(), llvm::VPValue::replaceAllUsesWith(), and ToRemove.

Referenced by llvm::VPlanTransforms::optimize().

licm()

static void licm ( VPlan &  Plan )

static

Move loop-invariant recipes out of the vector loop region in Plan.

Definition at line 1069 of file VPlanTransforms.cpp.

References llvm::any_of(), llvm::VPBasicBlock::end(), llvm::VPRegionBlock::getEntry(), llvm::VPlan::getVectorLoopRegion(), llvm::VPlan::getVectorPreheader(), llvm::make_early_inc_range(), and llvm::vp_depth_first_shallow().

mergeBlocksIntoPredecessors()

static bool mergeBlocksIntoPredecessors ( VPlan &  Plan )

static

Remove redundant VPBasicBlocks by merging them into their predecessor if the predecessor has a single successor.

Definition at line 369 of file VPlanTransforms.cpp.

References llvm::VPBlockUtils::connectBlocks(), llvm::VPBlockUtils::disconnectBlocks(), llvm::SmallVectorBase< Size_T >::empty(), llvm::VPBasicBlock::end(), llvm::VPlan::getEntry(), llvm::make_early_inc_range(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::to_vector(), and llvm::vp_depth_first_deep().

mergeReplicateRegionsIntoSuccessors()

static bool mergeReplicateRegionsIntoSuccessors ( VPlan &  Plan )

static

Definition at line 219 of file VPlanTransforms.cpp.

References assert(), llvm::VPBlockUtils::connectBlocks(), llvm::SetVector< T, Vector, Set, N >::contains(), llvm::VPBlockUtils::disconnectBlocks(), llvm::SetVector< T, Vector, Set, N >::empty(), llvm::VPlan::getEntry(), llvm::VPBasicBlock::getFirstNonPhi(), getPredicatedMask(), getPredicatedThenBlock(), llvm::VPBlockBase::getSingleSuccessor(), llvm::SetVector< T, Vector, Set, N >::insert(), llvm::make_early_inc_range(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::VPValue::replaceUsesWithIf(), llvm::reverse(), and llvm::vp_depth_first_deep().

Referenced by llvm::VPlanTransforms::createAndOptimizeReplicateRegions().

recursivelyDeleteDeadRecipes()

static void recursivelyDeleteDeadRecipes ( VPValue *  V )

static

Definition at line 646 of file VPlanTransforms.cpp.

References llvm::SmallVectorImpl< T >::append(), llvm::SmallVectorBase< Size_T >::empty(), llvm::VPValue::getDefiningRecipe(), llvm::SmallPtrSetImpl< PtrType >::insert(), isDeadRecipe(), llvm::SmallVectorImpl< T >::pop_back_val(), and llvm::SmallVectorTemplateBase< T, bool >::push_back().

Referenced by llvm::VPlanTransforms::optimizeForVFAndUF(), simplifyRecipe(), and transformRecipestoEVLRecipes().

removeRedundantCanonicalIVs()

static void removeRedundantCanonicalIVs ( VPlan &  Plan )

static

Try to replace VPWidenCanonicalIVRecipes with a widened canonical IV recipe, if it exists.

Definition at line 454 of file VPlanTransforms.cpp.

References llvm::any_of(), llvm::VPRecipeBase::eraseFromParent(), llvm::VPlan::getCanonicalIV(), llvm::VPBlockBase::getEntryBasicBlock(), llvm::VPlan::getVectorLoopRegion(), llvm::vputils::onlyFirstLaneUsed(), llvm::VPBasicBlock::phis(), llvm::VPValue::replaceAllUsesWith(), and llvm::VPValue::users().

Referenced by llvm::VPlanTransforms::optimize().

removeRedundantExpandSCEVRecipes()

static void removeRedundantExpandSCEVRecipes ( VPlan &  Plan )

static

Remove redundant EpxandSCEVRecipes in Plan's entry block by replacing them with already existing recipes expanding the same SCEV expression.

Definition at line 629 of file VPlanTransforms.cpp.

References llvm::VPlan::getEntry(), llvm::VPBlockBase::getEntryBasicBlock(), I, llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::insert(), and llvm::make_early_inc_range().

Referenced by llvm::VPlanTransforms::optimize().

removeRedundantInductionCasts()

static void removeRedundantInductionCasts ( VPlan &  Plan )

static

Remove redundant casts of inductions.

Such redundant casts are casts of induction variables that can be ignored, because we already proved that the casted phi is equal to the uncasted phi in the vectorized loop. There is no need to vectorize the cast - the same value can be used for both the phi and casts in the vector loop.

Definition at line 421 of file VPlanTransforms.cpp.

References llvm::VPBlockBase::getEntryBasicBlock(), llvm::VPlan::getVectorLoopRegion(), IV, llvm::VPBasicBlock::phis(), llvm::VPValue::replaceAllUsesWith(), llvm::reverse(), and llvm::VPValue::users().

Referenced by llvm::VPlanTransforms::optimize().

simplifyRecipe()

static void simplifyRecipe ( VPRecipeBase &  R, VPTypeAnalysis &  TypeInfo  )

static

Try to simplify recipe R.

Definition at line 946 of file VPlanTransforms.cpp.

References A, assert(), llvm::SmallPtrSetImpl< PtrType >::begin(), llvm::Type::getScalarSizeInBits(), I, llvm::VPTypeAnalysis::inferScalarType(), llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::PatternMatch::m_c_Mul(), llvm::PatternMatch::m_LogicalAnd(), llvm::PatternMatch::m_Not(), llvm::PatternMatch::m_SExt(), llvm::PatternMatch::m_SpecificInt(), llvm::PatternMatch::m_Trunc(), llvm::PatternMatch::m_ZExtOrSExt(), llvm::PatternMatch::match(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), recursivelyDeleteDeadRecipes(), llvm::VPValue::replaceAllUsesWith(), llvm::SmallPtrSetImplBase::size(), X, and Y.

Referenced by simplifyRecipes().

simplifyRecipes()

static void simplifyRecipes ( VPlan &  Plan )

static

Try to simplify the recipes in Plan.

Definition at line 1103 of file VPlanTransforms.cpp.

References llvm::VPlan::getCanonicalIV(), llvm::VPlan::getEntry(), llvm::VPCanonicalIVPHIRecipe::getScalarType(), llvm::make_early_inc_range(), and simplifyRecipe().

Referenced by llvm::VPlanTransforms::optimize().

sinkRecurrenceUsersAfterPrevious()

static bool sinkRecurrenceUsersAfterPrevious ( VPFirstOrderRecurrencePHIRecipe *  FOR, VPRecipeBase *  Previous, VPDominatorTree &  VPDT  )

static

Sink users of FOR after the recipe defining the previous value Previous of the recurrence.

Returns

true if all users of FOR could be re-arranged as needed or false if it is not possible.

Definition at line 716 of file VPlanTransforms.cpp.

References A, assert(), B, llvm::VPDef::getNumDefinedValues(), llvm::VPDef::getVPSingleValue(), I, llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::VPDominatorTree::properlyDominates(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::SmallVectorBase< Size_T >::size(), llvm::sort(), and llvm::VPValue::users().

Referenced by llvm::VPlanTransforms::adjustFixedOrderRecurrences().

sinkScalarOperands()

static bool sinkScalarOperands ( VPlan &  Plan )

static

Definition at line 109 of file VPlanTransforms.cpp.

References llvm::all_of(), llvm::VPlan::getEntry(), llvm::VPBlockBase::getEntryBasicBlock(), llvm::VPBlockBase::getExitingBasicBlock(), llvm::VPBasicBlock::getFirstNonPhi(), llvm::VPRecipeBase::getParent(), llvm::VPBlockBase::getSingleSuccessor(), llvm::VPBlockBase::getSuccessors(), llvm::VPSingleDefRecipe::getUnderlyingInstr(), llvm::VPlan::hasScalarVFOnly(), I, llvm::SetVector< T, Vector, Set, N >::insert(), llvm::VPRecipeBase::mayHaveSideEffects(), llvm::VPRecipeBase::mayReadOrWriteMemory(), llvm::VPRecipeBase::moveBefore(), llvm::VPUser::operands(), llvm::VPValue::replaceUsesWithIf(), llvm::SetVector< T, Vector, Set, N >::size(), llvm::SmallVectorBase< Size_T >::size(), llvm::VPValue::users(), and llvm::vp_depth_first_deep().

Referenced by llvm::VPlanTransforms::createAndOptimizeReplicateRegions().

transformRecipestoEVLRecipes()

static void transformRecipestoEVLRecipes ( VPlan &  Plan, VPValue &  EVL  )

static

Replace recipes with their EVL variants.

Definition at line 1446 of file VPlanTransforms.cpp.

References assert(), llvm::TypeSwitch< T, ResultT >::Case(), collectAllHeaderMasks(), collectUsersRecursively(), llvm::Default, llvm::VPlan::getCanonicalIV(), llvm::Type::getContext(), llvm::VPRecipeBase::getDebugLoc(), llvm::VPIntrinsic::getForIntrinsic(), llvm::VPIntrinsic::getForOpcode(), llvm::Type::getInt1Ty(), llvm::VPWidenMemoryRecipe::getMask(), llvm::VPIntrinsic::getMaskParamPos(), llvm::VPDef::getNumDefinedValues(), llvm::VPWidenCastRecipe::getOpcode(), llvm::VPlan::getOrAddLiveIn(), llvm::VPCanonicalIVPHIRecipe::getScalarType(), llvm::ConstantInt::getTrue(), llvm::VPSingleDefRecipe::getUnderlyingInstr(), llvm::VPIntrinsic::getVectorLengthParamPos(), llvm::VPlan::getVF(), llvm::VPDef::getVPSingleValue(), llvm::VPTypeAnalysis::inferScalarType(), llvm::VPRecipeBase::insertBefore(), llvm::Instruction::isBinaryOp(), llvm::Instruction::isUnaryOp(), LHS, llvm::PatternMatch::m_Select(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::match(), llvm::Intrinsic::not_intrinsic, llvm::VPUser::operands(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), recursivelyDeleteDeadRecipes(), llvm::VPValue::replaceAllUsesWith(), llvm::reverse(), RHS, and llvm::VPValue::users().

Referenced by llvm::VPlanTransforms::tryAddExplicitVectorLength().