VectorCombine.cpp File Reference

#include "llvm/Transforms/Vectorize/VectorCombine.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/AssumptionCache.h"
#include "llvm/Analysis/BasicAliasAnalysis.h"
#include "llvm/Analysis/GlobalsModRef.h"
#include "llvm/Analysis/Loads.h"
#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/Analysis/VectorUtils.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/PatternMatch.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Transforms/Utils/Local.h"
#include <numeric>
#include "llvm/Transforms/Utils/InstructionWorklist.h"

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "vector-combine"

Functions
	STATISTIC (NumVecLoad, "Number of vector loads formed")
	STATISTIC (NumVecCmp, "Number of vector compares formed")
	STATISTIC (NumVecBO, "Number of vector binops formed")
	STATISTIC (NumVecCmpBO, "Number of vector compare + binop formed")
	STATISTIC (NumShufOfBitcast, "Number of shuffles moved after bitcast")
	STATISTIC (NumScalarBO, "Number of scalar binops formed")
	STATISTIC (NumScalarCmp, "Number of scalar compares formed")
static bool	canWidenLoad (LoadInst *Load, const TargetTransformInfo &TTI)
static Value *	createShiftShuffle (Value *Vec, unsigned OldIndex, unsigned NewIndex, IRBuilder<> &Builder)
	Create a shuffle that translates (shifts) 1 element from the input vector to a new element location.
static ExtractElementInst *	translateExtract (ExtractElementInst *ExtElt, unsigned NewIndex, IRBuilder<> &Builder)
	Given an extract element instruction with constant index operand, shuffle the source vector (shift the scalar element) to a NewIndex for extraction.
static bool	isMemModifiedBetween (BasicBlock::iterator Begin, BasicBlock::iterator End, const MemoryLocation &Loc, AAResults &AA)
static ScalarizationResult	canScalarizeAccess (FixedVectorType *VecTy, Value *Idx, Instruction *CtxI, AssumptionCache &AC, const DominatorTree &DT)
	Check if it is legal to scalarize a memory access to VecTy at index Idx.
static Align	computeAlignmentAfterScalarization (Align VectorAlignment, Type *ScalarType, Value *Idx, const DataLayout &DL)
	The memory operation on a vector of ScalarType had alignment of VectorAlignment.

Variables
static cl::opt< bool >	DisableVectorCombine ("disable-vector-combine", cl::init(false), cl::Hidden, cl::desc("Disable all vector combine transforms"))
static cl::opt< bool >	DisableBinopExtractShuffle ("disable-binop-extract-shuffle", cl::init(false), cl::Hidden, cl::desc("Disable binop extract to shuffle transforms"))
static cl::opt< unsigned >	MaxInstrsToScan ("vector-combine-max-scan-instrs", cl::init(30), cl::Hidden, cl::desc("Max number of instructions to scan for vector combining."))
static const unsigned	InvalidIndex = std::numeric_limits<unsigned>::max()

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "vector-combine"

Definition at line 32 of file VectorCombine.cpp.

Function Documentation

canScalarizeAccess()

static ScalarizationResult canScalarizeAccess ( FixedVectorType *  VecTy, Value *  Idx, Instruction *  CtxI, AssumptionCache &  AC, const DominatorTree &  DT  )

static

Check if it is legal to scalarize a memory access to VecTy at index Idx.

Idx must access a valid vector element.

Definition at line 1016 of file VectorCombine.cpp.

References llvm::ConstantRange::binaryAnd(), llvm::CallingConv::C, llvm::computeConstantRange(), llvm::ConstantRange::contains(), llvm::FixedVectorType::getNumElements(), llvm::ConstantInt::getValue(), Idx, llvm::isGuaranteedNotToBePoison(), llvm::PatternMatch::m_And(), llvm::PatternMatch::m_ConstantInt(), llvm::PatternMatch::m_URem(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), and llvm::ConstantRange::urem().

canWidenLoad()

static bool canWidenLoad ( LoadInst *  Load, const TargetTransformInfo &  TTI  )

static

Definition at line 131 of file VectorCombine.cpp.

References llvm::TargetTransformInfo::getMinVectorRegisterBitWidth(), llvm::Type::getPrimitiveSizeInBits(), and llvm::mustSuppressSpeculation().

computeAlignmentAfterScalarization()

static Align computeAlignmentAfterScalarization ( Align  VectorAlignment, Type *  ScalarType, Value *  Idx, const DataLayout &  DL  )

static

The memory operation on a vector of ScalarType had alignment of VectorAlignment.

Compute the maximal, but conservatively correct, alignment that will be valid for the memory operation on a single scalar element of the same type with index Idx.

Definition at line 1058 of file VectorCombine.cpp.

References llvm::CallingConv::C, llvm::commonAlignment(), DL, and Idx.

createShiftShuffle()

static Value * createShiftShuffle ( Value *  Vec, unsigned  OldIndex, unsigned  NewIndex, IRBuilder<> &  Builder  )

static

Create a shuffle that translates (shifts) 1 element from the input vector to a new element location.

Definition at line 477 of file VectorCombine.cpp.

References Builder, llvm::Value::getType(), and llvm::PoisonMaskElem.

Referenced by translateExtract().

isMemModifiedBetween()

static bool isMemModifiedBetween ( BasicBlock::iterator  Begin, BasicBlock::iterator  End, const MemoryLocation &  Loc, AAResults &  AA  )

static

Definition at line 947 of file VectorCombine.cpp.

References End, llvm::AAResults::getModRefInfo(), llvm::isModSet(), and MaxInstrsToScan.

STATISTIC() [1/7]

STATISTIC	(	NumScalarBO	,
		"Number of scalar binops formed"
	)

STATISTIC() [2/7]

STATISTIC	(	NumScalarCmp	,
		"Number of scalar compares formed"
	)

STATISTIC() [3/7]

STATISTIC	(	NumShufOfBitcast	,
		"Number of shuffles moved after bitcast"
	)

STATISTIC() [4/7]

STATISTIC	(	NumVecBO	,
		"Number of vector binops formed"
	)

STATISTIC() [5/7]

STATISTIC	(	NumVecCmp	,
		"Number of vector compares formed"
	)

STATISTIC() [6/7]

STATISTIC	(	NumVecCmpBO	,
		"Number of vector compare + binop formed"
	)

STATISTIC() [7/7]

STATISTIC	(	NumVecLoad	,
		"Number of vector loads formed"
	)

translateExtract()

static ExtractElementInst * translateExtract ( ExtractElementInst *  ExtElt, unsigned  NewIndex, IRBuilder<> &  Builder  )

static

Given an extract element instruction with constant index operand, shuffle the source vector (shift the scalar element) to a NewIndex for extraction.

Return null if the input can be constant folded, so that we are not creating unnecessary instructions.

Definition at line 492 of file VectorCombine.cpp.

References assert(), Builder, llvm::CallingConv::C, createShiftShuffle(), llvm::ExtractElementInst::getIndexOperand(), llvm::User::getOperand(), llvm::Value::getType(), llvm::ExtractElementInst::getVectorOperand(), and X.

Variable Documentation

DisableBinopExtractShuffle

cl::opt< bool > DisableBinopExtractShuffle("disable-binop-extract-shuffle", cl::init(false), cl::Hidden, cl::desc("Disable binop extract to shuffle transforms")) ( "disable-binop-extract-shuffle"  , cl::init(false)  , cl::Hidden  , cl::desc("Disable binop extract to shuffle transforms")    )

static

DisableVectorCombine

cl::opt< bool > DisableVectorCombine("disable-vector-combine", cl::init(false), cl::Hidden, cl::desc("Disable all vector combine transforms")) ( "disable-vector-combine"  , cl::init(false)  , cl::Hidden  , cl::desc("Disable all vector combine transforms")    )

static

InvalidIndex

const unsigned InvalidIndex = std::numeric_limits<unsigned>::max()

static

Definition at line 58 of file VectorCombine.cpp.

MaxInstrsToScan

cl::opt< unsigned > MaxInstrsToScan("vector-combine-max-scan-instrs", cl::init(30), cl::Hidden, cl::desc("Max number of instructions to scan for vector combining.")) ( "vector-combine-max-scan-instrs"  , cl::init(30)  , cl::Hidden  , cl::desc("Max number of instructions to scan for vector combining.")    )

static

Referenced by isMemModifiedBetween().