ScalarEvolutionExpander.cpp File Reference

#include "llvm/Transforms/Utils/ScalarEvolutionExpander.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/ScopeExit.h"
#include "llvm/Analysis/InstructionSimplify.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/ScalarEvolutionPatternMatch.h"
#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/PatternMatch.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/Transforms/Utils/LoopUtils.h"

Go to the source code of this file.

Macros
#define	SCEV_DEBUG_WITH_TYPE(TYPE, X)

Functions
static const Loop *	PickMostRelevantLoop (const Loop *A, const Loop *B, DominatorTree &DT)
	PickMostRelevantLoop - Given two loops pick the one that's most relevant for SCEV expansion.
static bool	canBeCheaplyTransformed (ScalarEvolution &SE, const SCEVAddRecExpr *Phi, const SCEVAddRecExpr *Requested, bool &InvertStep)
	Check whether we can cheaply express the requested SCEV in terms of the available PHI SCEV by truncation and/or inversion of the step.
static bool	IsIncrementNSW (ScalarEvolution &SE, const SCEVAddRecExpr *AR)
static bool	IsIncrementNUW (ScalarEvolution &SE, const SCEVAddRecExpr *AR)
static bool	canReuseCastForPtrToAddr (const CastInst *CI, Type *Ty, const DataLayout &DL)
	Return true if CI computes the same value as a ptrtoaddr of its pointer operand to Ty.
template<typename T>
static InstructionCost	costAndCollectOperands (const SCEVOperand &WorkItem, const TargetTransformInfo &TTI, TargetTransformInfo::TargetCostKind CostKind, SmallVectorImpl< SCEVOperand > &Worklist)

Macro Definition Documentation

SCEV_DEBUG_WITH_TYPE

#define SCEV_DEBUG_WITH_TYPE	(		TYPE,
			X )

Definition at line 35 of file ScalarEvolutionExpander.cpp.

Referenced by llvm::SCEVExpander::replaceCongruentIVs().

Function Documentation

canBeCheaplyTransformed()

bool canBeCheaplyTransformed ( ScalarEvolution & SE, const SCEVAddRecExpr * Phi, const SCEVAddRecExpr * Requested, bool & InvertStep )

static

Check whether we can cheaply express the requested SCEV in terms of the available PHI SCEV by truncation and/or inversion of the step.

Definition at line 933 of file ScalarEvolutionExpander.cpp.

References llvm::dyn_cast(), llvm::Type::getIntegerBitWidth(), llvm::ScalarEvolution::getMinusSCEV(), llvm::SCEVAddRecExpr::getStart(), llvm::ScalarEvolution::getTruncateOrNoop(), llvm::SCEV::getType(), and llvm::Type::isPointerTy().

canReuseCastForPtrToAddr()

bool canReuseCastForPtrToAddr ( const CastInst * CI, Type * Ty, const DataLayout & DL )

static

Return true if CI computes the same value as a ptrtoaddr of its pointer operand to Ty.

Definition at line 1469 of file ScalarEvolutionExpander.cpp.

References DL, llvm::CastInst::getOpcode(), llvm::Type::getPointerAddressSpace(), llvm::CastInst::getSrcTy(), and llvm::Value::getType().

Referenced by llvm::SCEVExpander::findReusableCastForPtrToAddr().

costAndCollectOperands()

template<typename T>

InstructionCost costAndCollectOperands ( const SCEVOperand & WorkItem, const TargetTransformInfo & TTI, TargetTransformInfo::TargetCostKind CostKind, SmallVectorImpl< SCEVOperand > & Worklist )

static

Definition at line 2007 of file ScalarEvolutionExpander.cpp.

References assert(), llvm::CmpInst::BAD_ICMP_PREDICATE, llvm::cast(), CostKind, llvm::dyn_cast(), llvm::SmallVectorImpl< T >::emplace_back(), llvm::enumerate(), llvm::isa(), llvm_unreachable, llvm::CmpInst::makeCmpResultType(), llvm::max(), llvm::min(), llvm::TargetTransformInfo::None, Opc, OpIdx, llvm::scAddExpr, llvm::scAddRecExpr, llvm::scConstant, llvm::scCouldNotCompute, llvm::scMulExpr, llvm::scPtrToAddr, llvm::scSequentialUMinExpr, llvm::scSignExtend, llvm::scSMaxExpr, llvm::scSMinExpr, llvm::scTruncate, llvm::scUDivExpr, llvm::scUMaxExpr, llvm::scUMinExpr, llvm::scUnknown, llvm::scVScale, llvm::scZeroExtend, and T.

IsIncrementNSW()

bool IsIncrementNSW ( ScalarEvolution & SE, const SCEVAddRecExpr * AR )

static

Definition at line 966 of file ScalarEvolutionExpander.cpp.

References llvm::BitWidth, llvm::cast(), llvm::IntegerType::get(), llvm::ScalarEvolution::getAddExpr(), llvm::Type::getContext(), llvm::ScalarEvolution::getSignExtendExpr(), llvm::SCEVAddRecExpr::getStepRecurrence(), llvm::SCEV::getType(), and llvm::isa().

IsIncrementNUW()

bool IsIncrementNUW ( ScalarEvolution & SE, const SCEVAddRecExpr * AR )

static

Definition at line 980 of file ScalarEvolutionExpander.cpp.

References llvm::BitWidth, llvm::cast(), llvm::IntegerType::get(), llvm::ScalarEvolution::getAddExpr(), llvm::Type::getContext(), llvm::SCEVAddRecExpr::getStepRecurrence(), llvm::SCEV::getType(), llvm::ScalarEvolution::getZeroExtendExpr(), and llvm::isa().

PickMostRelevantLoop()

const Loop * PickMostRelevantLoop ( const Loop * A, const Loop * B, DominatorTree & DT )

static

PickMostRelevantLoop - Given two loops pick the one that's most relevant for SCEV expansion.

If they are nested, this is the most nested. If they are neighboring, pick the later.

Definition at line 436 of file ScalarEvolutionExpander.cpp.

References A(), B(), and llvm::DominatorTree::dominates().