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/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/Transforms/Vectorize.h"
#include "llvm/Transforms/Utils/InstructionWorklist.h"

Include dependency graph for VectorCombine.cpp:

Go to the source code of this file.

Classes
class	ScalarizationResult
	Helper class to indicate whether a vector index can be safely scalarized and if a freeze needs to be inserted. More...

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 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. More...
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. More...
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. More...
static Align	computeAlignmentAfterScalarization (Align VectorAlignment, Type *ScalarType, Value *Idx, const DataLayout &DL)
	The memory operation on a vector of ScalarType had alignment of VectorAlignment. More...
	INITIALIZE_PASS_BEGIN (VectorCombineLegacyPass, "vector-combine", "Optimize scalar/vector ops", false, false) INITIALIZE_PASS_END(VectorCombineLegacyPass

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()
vector	combine
vector Optimize scalar vector	ops
vector Optimize scalar vector	false

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "vector-combine"

Definition at line 34 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 866 of file VectorCombine.cpp.

References llvm::ConstantRange::binaryAnd(), llvm::computeConstantRange(), llvm::ConstantRange::contains(), llvm::FixedVectorType::getNumElements(), llvm::Type::getScalarSizeInBits(), llvm::Value::getType(), llvm::ConstantInt::getValue(), llvm::isGuaranteedNotToBePoison(), llvm::PatternMatch::m_And(), llvm::PatternMatch::m_ConstantInt(), llvm::PatternMatch::m_URem(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), ScalarizationResult::safe(), ScalarizationResult::safeWithFreeze(), ScalarizationResult::unsafe(), and llvm::ConstantRange::urem().

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 908 of file VectorCombine.cpp.

References llvm::commonAlignment(), and DL.

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 399 of file VectorCombine.cpp.

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

Referenced by translateExtract().

INITIALIZE_PASS_BEGIN()

INITIALIZE_PASS_BEGIN	(	VectorCombineLegacyPass	,
		"vector-combine"	,
		"Optimize scalar/vector ops"	,
		false	,
		false
	)

isMemModifiedBetween()

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

static

Definition at line 799 of file VectorCombine.cpp.

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 414 of file VectorCombine.cpp.

References assert(), Builder, createShiftShuffle(), llvm::ExtractElementInst::getIndexOperand(), llvm::ExtractElementInst::getVectorOperand(), and X.

Variable Documentation

combine

vector combine

Definition at line 1548 of file VectorCombine.cpp.

DisableBinopExtractShuffle

cl::opt<bool> DisableBinopExtractShuffle("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"))

static

false

vector Optimize scalar vector false

Definition at line 1549 of file VectorCombine.cpp.

InvalidIndex

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

static

Definition at line 60 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."))

static

ops

vector Optimize scalar vector ops

Definition at line 1549 of file VectorCombine.cpp.