CorrelatedValuePropagation.cpp File Reference

#include "llvm/Transforms/Scalar/CorrelatedValuePropagation.h"
#include "llvm/ADT/DepthFirstIterator.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/DomTreeUpdater.h"
#include "llvm/Analysis/GlobalsModRef.h"
#include "llvm/Analysis/InstructionSimplify.h"
#include "llvm/Analysis/LazyValueInfo.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/CFG.h"
#include "llvm/IR/Constant.h"
#include "llvm/IR/ConstantRange.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Operator.h"
#include "llvm/IR/PassManager.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/Value.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Transforms/Utils/Local.h"
#include <cassert>
#include <utility>

Include dependency graph for CorrelatedValuePropagation.cpp:

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "correlated-value-propagation"

Enumerations
enum	Domain { Domain::NonNegative, Domain::NonPositive, Domain::Unknown }

Functions
	STATISTIC (NumPhis, "Number of phis propagated")
	STATISTIC (NumPhiCommon, "Number of phis deleted via common incoming value")
	STATISTIC (NumSelects, "Number of selects propagated")
	STATISTIC (NumMemAccess, "Number of memory access targets propagated")
	STATISTIC (NumCmps, "Number of comparisons propagated")
	STATISTIC (NumReturns, "Number of return values propagated")
	STATISTIC (NumDeadCases, "Number of switch cases removed")
	STATISTIC (NumSDivSRemsNarrowed, "Number of sdivs/srems whose width was decreased")
	STATISTIC (NumSDivs, "Number of sdiv converted to udiv")
	STATISTIC (NumUDivURemsNarrowed, "Number of udivs/urems whose width was decreased")
	STATISTIC (NumAShrs, "Number of ashr converted to lshr")
	STATISTIC (NumSRems, "Number of srem converted to urem")
	STATISTIC (NumSExt, "Number of sext converted to zext")
	STATISTIC (NumAnd, "Number of ands removed")
	STATISTIC (NumNW, "Number of no-wrap deductions")
	STATISTIC (NumNSW, "Number of no-signed-wrap deductions")
	STATISTIC (NumNUW, "Number of no-unsigned-wrap deductions")
	STATISTIC (NumAddNW, "Number of no-wrap deductions for add")
	STATISTIC (NumAddNSW, "Number of no-signed-wrap deductions for add")
	STATISTIC (NumAddNUW, "Number of no-unsigned-wrap deductions for add")
	STATISTIC (NumSubNW, "Number of no-wrap deductions for sub")
	STATISTIC (NumSubNSW, "Number of no-signed-wrap deductions for sub")
	STATISTIC (NumSubNUW, "Number of no-unsigned-wrap deductions for sub")
	STATISTIC (NumMulNW, "Number of no-wrap deductions for mul")
	STATISTIC (NumMulNSW, "Number of no-signed-wrap deductions for mul")
	STATISTIC (NumMulNUW, "Number of no-unsigned-wrap deductions for mul")
	STATISTIC (NumShlNW, "Number of no-wrap deductions for shl")
	STATISTIC (NumShlNSW, "Number of no-signed-wrap deductions for shl")
	STATISTIC (NumShlNUW, "Number of no-unsigned-wrap deductions for shl")
	STATISTIC (NumAbs, "Number of llvm.abs intrinsics removed")
	STATISTIC (NumOverflows, "Number of overflow checks removed")
	STATISTIC (NumSaturating, "Number of saturating arithmetics converted to normal arithmetics")
	STATISTIC (NumNonNull, "Number of function pointer arguments marked non-null")
	STATISTIC (NumMinMax, "Number of llvm.[us]{min,max} intrinsics removed")
	INITIALIZE_PASS_BEGIN (CorrelatedValuePropagation, "correlated-propagation", "Value Propagation", false, false) INITIALIZE_PASS_END(CorrelatedValuePropagation
static bool	processSelect (SelectInst *S, LazyValueInfo *LVI)
static bool	simplifyCommonValuePhi (PHINode *P, LazyValueInfo *LVI, DominatorTree *DT)
	Try to simplify a phi with constant incoming values that match the edge values of a non-constant value on all other edges: bb0: isnull = icmp eq i8* x, null br i1 isnull, label bb2, label bb1 bb1: br label bb2 bb2: r = phi i8* [ x, bb1 ], [ null, bb0 ] --> r = x. More...
static bool	processPHI (PHINode *P, LazyValueInfo *LVI, DominatorTree *DT, const SimplifyQuery &SQ)
static bool	processMemAccess (Instruction *I, LazyValueInfo *LVI)
static bool	processCmp (CmpInst *Cmp, LazyValueInfo *LVI)
	See if LazyValueInfo's ability to exploit edge conditions or range information is sufficient to prove this comparison. More...
static bool	processSwitch (SwitchInst *I, LazyValueInfo *LVI, DominatorTree *DT)
	Simplify a switch instruction by removing cases which can never fire. More...
static bool	willNotOverflow (BinaryOpIntrinsic *BO, LazyValueInfo *LVI)
static void	setDeducedOverflowingFlags (Value *V, Instruction::BinaryOps Opcode, bool NewNSW, bool NewNUW)
static bool	processBinOp (BinaryOperator *BinOp, LazyValueInfo *LVI)
static bool	processAbsIntrinsic (IntrinsicInst *II, LazyValueInfo *LVI)
static bool	processMinMaxIntrinsic (MinMaxIntrinsic *MM, LazyValueInfo *LVI)
static bool	processOverflowIntrinsic (WithOverflowInst *WO, LazyValueInfo *LVI)
static bool	processSaturatingInst (SaturatingInst *SI, LazyValueInfo *LVI)
static bool	processCallSite (CallBase &CB, LazyValueInfo *LVI)
	Infer nonnull attributes for the arguments at the specified callsite. More...
static bool	isNonNegative (Value *V, LazyValueInfo *LVI, Instruction *CxtI)
static bool	isNonPositive (Value *V, LazyValueInfo *LVI, Instruction *CxtI)
Domain	getDomain (Value *V, LazyValueInfo *LVI, Instruction *CxtI)
static bool	narrowSDivOrSRem (BinaryOperator *Instr, LazyValueInfo *LVI)
	Try to shrink a sdiv/srem's width down to the smallest power of two that's sufficient to contain its operands. More...
static bool	processUDivOrURem (BinaryOperator *Instr, LazyValueInfo *LVI)
	Try to shrink a udiv/urem's width down to the smallest power of two that's sufficient to contain its operands. More...
static bool	processSRem (BinaryOperator *SDI, LazyValueInfo *LVI)
static bool	processSDiv (BinaryOperator *SDI, LazyValueInfo *LVI)
	See if LazyValueInfo's ability to exploit edge conditions or range information is sufficient to prove the signs of both operands of this SDiv. More...
static bool	processSDivOrSRem (BinaryOperator *Instr, LazyValueInfo *LVI)
static bool	processAShr (BinaryOperator *SDI, LazyValueInfo *LVI)
static bool	processSExt (SExtInst *SDI, LazyValueInfo *LVI)
static bool	processAnd (BinaryOperator *BinOp, LazyValueInfo *LVI)
static Constant *	getConstantAt (Value *V, Instruction *At, LazyValueInfo *LVI)
static bool	runImpl (Function &F, LazyValueInfo *LVI, DominatorTree *DT, const SimplifyQuery &SQ)

Variables
correlated	propagation
correlated Value	Propagation
correlated Value	false

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "correlated-value-propagation"

Definition at line 53 of file CorrelatedValuePropagation.cpp.

Enumeration Type Documentation

Domain

enum Domain

strong

Enumerator
NonNegative
NonPositive
Unknown

Definition at line 685 of file CorrelatedValuePropagation.cpp.

Function Documentation

getConstantAt()

static Constant* getConstantAt ( Value *  V, Instruction *  At, LazyValueInfo *  LVI  )

static

Definition at line 1018 of file CorrelatedValuePropagation.cpp.

References llvm::LazyValueInfo::getConstant(), llvm::ConstantInt::getFalse(), llvm::LazyValueInfo::getPredicateAt(), llvm::ConstantInt::getTrue(), llvm::LazyValueInfo::True, and llvm::LazyValueInfo::Unknown.

Referenced by runImpl().

getDomain()

Domain getDomain	(	Value *	V,
		LazyValueInfo *	LVI,
		Instruction *	CxtI
	)

Definition at line 687 of file CorrelatedValuePropagation.cpp.

References isNonNegative(), isNonPositive(), NonNegative, NonPositive, and Unknown.

Referenced by collectMDInDomain(), llvm::MDNode::getMostGenericAliasScope(), processSDiv(), and processSRem().

INITIALIZE_PASS_BEGIN()

INITIALIZE_PASS_BEGIN	(	CorrelatedValuePropagation	,
		"correlated-propagation"	,
		"Value Propagation"	,
		false	,
		false
	)

isNonNegative()

static bool isNonNegative ( Value *  V, LazyValueInfo *  LVI, Instruction *  CxtI  )

static

Definition at line 671 of file CorrelatedValuePropagation.cpp.

References llvm::ConstantInt::get(), llvm::LazyValueInfo::getPredicateAt(), llvm::Value::getType(), llvm::CmpInst::ICMP_SGE, and llvm::LazyValueInfo::True.

Referenced by llvm::ConstantRange::ashr(), getDomain(), llvm::APSInt::isStrictlyPositive(), llvm::APInt::isStrictlyPositive(), processAShr(), and processSExt().

isNonPositive()

static bool isNonPositive ( Value *  V, LazyValueInfo *  LVI, Instruction *  CxtI  )

static

Definition at line 678 of file CorrelatedValuePropagation.cpp.

References llvm::ConstantInt::get(), llvm::LazyValueInfo::getPredicateAt(), llvm::Value::getType(), llvm::CmpInst::ICMP_SLE, and llvm::LazyValueInfo::True.

Referenced by getDomain().

narrowSDivOrSRem()

static bool narrowSDivOrSRem ( BinaryOperator *  Instr, LazyValueInfo *  LVI  )

static

Try to shrink a sdiv/srem's width down to the smallest power of two that's sufficient to contain its operands.

Definition at line 697 of file CorrelatedValuePropagation.cpp.

References assert(), B, contains(), llvm::Instruction::eraseFromParent(), llvm::APInt::getAllOnes(), llvm::LazyValueInfo::getConstantRange(), llvm::Value::getContext(), llvm::Type::getIntegerBitWidth(), llvm::Type::getIntNTy(), llvm::Value::getName(), llvm::BinaryOperator::getOpcode(), llvm::User::getOperand(), llvm::APInt::getSignedMinValue(), llvm::Value::getType(), I, llvm::Instruction::isExact(), llvm::Type::isVectorTy(), llvm::max(), llvm::User::operands(), llvm::PowerOf2Ceil(), llvm::Value::replaceAllUsesWith(), and llvm::zip().

Referenced by processSDivOrSRem().

processAbsIntrinsic()

static bool processAbsIntrinsic ( IntrinsicInst *  II, LazyValueInfo *  LVI  )

static

Definition at line 476 of file CorrelatedValuePropagation.cpp.

References assert(), B, llvm::Instruction::eraseFromParent(), llvm::LazyValueInfo::False, llvm::ConstantInt::get(), llvm::CallBase::getArgOperand(), llvm::Value::getContext(), llvm::Value::getName(), llvm::Constant::getNullValue(), llvm::LazyValueInfo::getPredicateAt(), llvm::Type::getScalarSizeInBits(), llvm::APInt::getSignedMinValue(), llvm::ConstantInt::getTrue(), processBinOp(), llvm::Value::replaceAllUsesWith(), llvm::CallBase::setArgOperand(), llvm::LazyValueInfo::True, llvm::LazyValueInfo::Unknown, and X.

Referenced by processCallSite().

processAnd()

static bool processAnd ( BinaryOperator *  BinOp, LazyValueInfo *  LVI  )

static

Definition at line 993 of file CorrelatedValuePropagation.cpp.

References llvm::Instruction::eraseFromParent(), llvm::LazyValueInfo::getConstantRange(), llvm::User::getOperand(), llvm::Value::getType(), llvm::ConstantRange::getUnsignedMax(), llvm::ConstantInt::getValue(), llvm::APInt::isMask(), llvm::Type::isVectorTy(), llvm::Value::replaceAllUsesWith(), and llvm::APInt::ule().

Referenced by runImpl().

processAShr()

static bool processAShr ( BinaryOperator *  SDI, LazyValueInfo *  LVI  )

static

Definition at line 918 of file CorrelatedValuePropagation.cpp.

References llvm::Instruction::eraseFromParent(), llvm::Instruction::getDebugLoc(), llvm::Value::getName(), llvm::User::getOperand(), llvm::Value::getType(), llvm::Instruction::isExact(), isNonNegative(), llvm::Type::isVectorTy(), and llvm::Value::replaceAllUsesWith().

Referenced by runImpl().

processBinOp()

static bool processBinOp ( BinaryOperator *  BinOp, LazyValueInfo *  LVI  )

static

Definition at line 955 of file CorrelatedValuePropagation.cpp.

References llvm::ConstantRange::contains(), llvm::LazyValueInfo::getConstantRange(), llvm::BinaryOperator::getOpcode(), llvm::User::getOperand(), llvm::Value::getType(), llvm::Instruction::hasNoSignedWrap(), llvm::Instruction::hasNoUnsignedWrap(), llvm::Type::isVectorTy(), llvm::ConstantRange::makeGuaranteedNoWrapRegion(), and setDeducedOverflowingFlags().

Referenced by processAbsIntrinsic(), processOverflowIntrinsic(), processSaturatingInst(), and runImpl().

processCallSite()

static bool processCallSite ( CallBase &  CB, LazyValueInfo *  LVI  )

static

Infer nonnull attributes for the arguments at the specified callsite.

Definition at line 594 of file CorrelatedValuePropagation.cpp.

References llvm::abs(), llvm::AttributeList::addParamAttribute(), llvm::CallBase::arg_size(), llvm::CallBase::args(), assert(), llvm::LazyValueInfo::False, llvm::Use::get(), llvm::Attribute::get(), llvm::ConstantPointerNull::get(), llvm::CallBase::getAttributes(), llvm::LazyValueInfo::getConstant(), llvm::Value::getContext(), llvm::CallBase::getIntrinsicID(), llvm::CallBase::getOperandBundle(), llvm::LazyValueInfo::getPredicateAt(), llvm::Value::getType(), llvm::CmpInst::ICMP_EQ, llvm::Type::isVectorTy(), llvm::LLVMContext::OB_deopt, llvm::CallBase::paramHasAttr(), processAbsIntrinsic(), processMinMaxIntrinsic(), processOverflowIntrinsic(), processSaturatingInst(), llvm::Use::set(), llvm::CallBase::setAttributes(), SI, and willNotOverflow().

Referenced by runImpl().

processCmp()

static bool processCmp ( CmpInst *  Cmp, LazyValueInfo *  LVI  )

static

See if LazyValueInfo's ability to exploit edge conditions or range information is sufficient to prove this comparison.

Even for local conditions, this can sometimes prove conditions instcombine can't by exploiting range information.

Definition at line 302 of file CorrelatedValuePropagation.cpp.

References llvm::ConstantInt::get(), llvm::Type::getInt1Ty(), llvm::LazyValueInfo::getPredicateAt(), and llvm::LazyValueInfo::Unknown.

Referenced by runImpl().

processMemAccess()

static bool processMemAccess ( Instruction *  I, LazyValueInfo *  LVI  )

static

Definition at line 281 of file CorrelatedValuePropagation.cpp.

References llvm::LazyValueInfo::getConstant(), and I.

Referenced by runImpl().

processMinMaxIntrinsic()

static bool processMinMaxIntrinsic ( MinMaxIntrinsic *  MM, LazyValueInfo *  LVI  )

static

Definition at line 533 of file CorrelatedValuePropagation.cpp.

References llvm::Instruction::eraseFromParent(), llvm::MinMaxIntrinsic::getLHS(), llvm::CmpInst::getNonStrictPredicate(), llvm::User::getOperand(), llvm::MinMaxIntrinsic::getPredicate(), llvm::LazyValueInfo::getPredicateAt(), llvm::MinMaxIntrinsic::getRHS(), llvm::Value::replaceAllUsesWith(), and llvm::LazyValueInfo::Unknown.

Referenced by processCallSite().

processOverflowIntrinsic()

static bool processOverflowIntrinsic ( WithOverflowInst *  WO, LazyValueInfo *  LVI  )

static

Definition at line 547 of file CorrelatedValuePropagation.cpp.

References B, llvm::Instruction::eraseFromParent(), llvm::ConstantStruct::get(), llvm::UndefValue::get(), llvm::BinaryOpIntrinsic::getBinaryOp(), llvm::ConstantInt::getFalse(), llvm::BinaryOpIntrinsic::getLHS(), llvm::Value::getName(), llvm::BinaryOpIntrinsic::getRHS(), llvm::Value::getType(), llvm::BinaryOpIntrinsic::isSigned(), processBinOp(), llvm::Value::replaceAllUsesWith(), setDeducedOverflowingFlags(), and llvm::ARM_MB::ST.

Referenced by processCallSite().

processPHI()

static bool processPHI ( PHINode *  P, LazyValueInfo *  LVI, DominatorTree *  DT, const SimplifyQuery &  SQ  )

static

Definition at line 211 of file CorrelatedValuePropagation.cpp.

References BB, llvm::dbgs(), llvm::numbers::e, llvm::LazyValueInfo::False, llvm::LazyValueInfo::getConstantOnEdge(), llvm::LazyValueInfo::getPredicateOnEdge(), llvm::Value::getType(), i, llvm::CmpInst::ICMP_EQ, llvm::Type::isVectorTy(), LLVM_DEBUG, P, SI, simplifyCommonValuePhi(), and llvm::SimplifyInstruction().

Referenced by runImpl().

processSaturatingInst()

static bool processSaturatingInst ( SaturatingInst *  SI, LazyValueInfo *  LVI  )

static

Definition at line 573 of file CorrelatedValuePropagation.cpp.

References llvm::BinaryOperator::Create(), processBinOp(), llvm::Instruction::setDebugLoc(), setDeducedOverflowingFlags(), and SI.

Referenced by processCallSite().

processSDiv()

static bool processSDiv ( BinaryOperator *  SDI, LazyValueInfo *  LVI  )

static

See if LazyValueInfo's ability to exploit edge conditions or range information is sufficient to prove the signs of both operands of this SDiv.

If this is the case, replace the SDiv with a UDiv. Even for local conditions, this can sometimes prove conditions instcombine can't by exploiting range information.

Definition at line 849 of file CorrelatedValuePropagation.cpp.

References assert(), llvm::BinaryOperator::CreateNeg(), D, llvm::Instruction::eraseFromParent(), llvm::Instruction::getDebugLoc(), getDomain(), llvm::Value::getName(), llvm::BinaryOperator::getOpcode(), llvm::Value::getType(), I, llvm::Instruction::isExact(), llvm::Type::isVectorTy(), NonNegative, llvm::User::operands(), processUDivOrURem(), llvm::Value::replaceAllUsesWith(), Unknown, and llvm::zip().

Referenced by processSDivOrSRem().

processSDivOrSRem()

static bool processSDivOrSRem ( BinaryOperator *  Instr, LazyValueInfo *  LVI  )

static

Definition at line 901 of file CorrelatedValuePropagation.cpp.

References assert(), llvm::BinaryOperator::getOpcode(), llvm::Value::getType(), llvm::Type::isVectorTy(), narrowSDivOrSRem(), processSDiv(), and processSRem().

Referenced by runImpl().

processSelect()

static bool processSelect ( SelectInst *  S, LazyValueInfo *  LVI  )

static

Definition at line 130 of file CorrelatedValuePropagation.cpp.

References llvm::LazyValueInfo::getConstant(), llvm::ConstantInt::isOne(), and S.

Referenced by runImpl().

processSExt()

static bool processSExt ( SExtInst *  SDI, LazyValueInfo *  LVI  )

static

Definition at line 936 of file CorrelatedValuePropagation.cpp.

References llvm::sampleprof::Base, llvm::CastInst::CreateZExtOrBitCast(), llvm::Instruction::eraseFromParent(), llvm::Instruction::getDebugLoc(), llvm::Value::getName(), llvm::User::getOperand(), llvm::Value::getType(), isNonNegative(), llvm::Type::isVectorTy(), and llvm::Value::replaceAllUsesWith().

Referenced by runImpl().

processSRem()

static bool processSRem ( BinaryOperator *  SDI, LazyValueInfo *  LVI  )

static

Definition at line 793 of file CorrelatedValuePropagation.cpp.

References assert(), llvm::BinaryOperator::CreateNeg(), D, llvm::Instruction::eraseFromParent(), llvm::Instruction::getDebugLoc(), getDomain(), llvm::Value::getName(), llvm::BinaryOperator::getOpcode(), llvm::Value::getType(), I, llvm::Type::isVectorTy(), NonNegative, NonPositive, llvm::User::operands(), processUDivOrURem(), llvm::Value::replaceAllUsesWith(), Unknown, and llvm::zip().

Referenced by processSDivOrSRem().

processSwitch()

static bool processSwitch ( SwitchInst *  I, LazyValueInfo *  LVI, DominatorTree *  DT  )

static

Simplify a switch instruction by removing cases which can never fire.

If the uselessness of a case could be determined locally then constant propagation would already have figured it out. Instead, walk the predecessors and statically evaluate cases based on information available on that edge. Cases that cannot fire no matter what the incoming edge can safely be removed. If a case fires on every incoming edge then the entire switch can be removed and replaced with a branch to the case destination.

Definition at line 328 of file CorrelatedValuePropagation.cpp.

References llvm::DomTreeUpdater::applyUpdatesPermissive(), BB, Cond, llvm::ConstantFoldTerminator(), llvm::createUnreachableSwitchDefault(), llvm::DominatorTreeBase< BasicBlock, false >::Delete, llvm::LazyValueInfo::False, llvm::LazyValueInfo::getConstantRange(), llvm::LazyValueInfo::getPredicateAt(), llvm::ConstantRange::getSignedMax(), llvm::APInt::getSignedMaxValue(), llvm::ConstantRange::getSignedMin(), llvm::APInt::getSignedMinValue(), llvm::ConstantInt::getValue(), High, I, llvm::CmpInst::ICMP_EQ, llvm::DomTreeUpdater::Lazy, llvm::BasicBlock::removePredecessor(), SI, llvm::APIntOps::smax(), llvm::APIntOps::smin(), llvm::successors(), and llvm::LazyValueInfo::True.

Referenced by llvm::PredicateInfoBuilder::buildPredicateInfo(), and runImpl().

processUDivOrURem()

static bool processUDivOrURem ( BinaryOperator *  Instr, LazyValueInfo *  LVI  )

static

Try to shrink a udiv/urem's width down to the smallest power of two that's sufficient to contain its operands.

Definition at line 751 of file CorrelatedValuePropagation.cpp.

References assert(), B, llvm::Instruction::eraseFromParent(), llvm::ConstantRange::getActiveBits(), llvm::LazyValueInfo::getConstantRange(), llvm::Value::getContext(), llvm::Type::getIntegerBitWidth(), llvm::Type::getIntNTy(), llvm::Value::getName(), llvm::BinaryOperator::getOpcode(), llvm::User::getOperand(), llvm::Value::getType(), llvm::Instruction::isExact(), llvm::Type::isVectorTy(), llvm::max(), llvm::User::operands(), llvm::PowerOf2Ceil(), and llvm::Value::replaceAllUsesWith().

Referenced by processSDiv(), processSRem(), and runImpl().

runImpl()

static bool runImpl ( Function &  F, LazyValueInfo *  LVI, DominatorTree *  DT, const SimplifyQuery &  SQ  )

static

Definition at line 1041 of file CorrelatedValuePropagation.cpp.

References llvm::MCID::Add, BB, llvm::MCID::Call, llvm::depth_first(), F, getConstantAt(), llvm::SPII::Load, llvm::make_early_inc_range(), processAnd(), processAShr(), processBinOp(), processCallSite(), processCmp(), processMemAccess(), processPHI(), processSDivOrSRem(), processSelect(), processSExt(), processSwitch(), processUDivOrURem(), llvm::MipsISD::Ret, llvm::MCID::Select, llvm::SPII::Store, and llvm::M68kBeads::Term.

Referenced by llvm::CorrelatedValuePropagationPass::run().

setDeducedOverflowingFlags()

static void setDeducedOverflowingFlags ( Value *  V, Instruction::BinaryOps  Opcode, bool  NewNSW, bool  NewNUW  )

static

Definition at line 424 of file CorrelatedValuePropagation.cpp.

References llvm::MCID::Add, and llvm_unreachable.

Referenced by processBinOp(), processOverflowIntrinsic(), and processSaturatingInst().

simplifyCommonValuePhi()

static bool simplifyCommonValuePhi ( PHINode *  P, LazyValueInfo *  LVI, DominatorTree *  DT  )

static

Try to simplify a phi with constant incoming values that match the edge values of a non-constant value on all other edges: bb0: isnull = icmp eq i8* x, null br i1 isnull, label bb2, label bb1 bb1: br label bb2 bb2: r = phi i8* [ x, bb1 ], [ null, bb0 ] --> r = x.

Definition at line 160 of file CorrelatedValuePropagation.cpp.

References llvm::DominatorTree::dominates(), llvm::numbers::e, llvm::LazyValueInfo::getConstantOnEdge(), i, llvm::isGuaranteedNotToBePoison(), and P.

Referenced by processPHI().

STATISTIC() [1/34]

STATISTIC	(	NumAbs	,
		"Number of llvm.abs intrinsics removed"
	)

STATISTIC() [2/34]

STATISTIC	(	NumAddNSW	,
		"Number of no-signed-wrap deductions for add"
	)

STATISTIC() [3/34]

STATISTIC	(	NumAddNUW	,
		"Number of no-unsigned-wrap deductions for add"
	)

STATISTIC() [4/34]

STATISTIC	(	NumAddNW	,
		"Number of no-wrap deductions for add"
	)

STATISTIC() [5/34]

STATISTIC	(	NumAnd	,
		"Number of ands removed"
	)

STATISTIC() [6/34]

STATISTIC	(	NumAShrs	,
		"Number of ashr converted to lshr"
	)

STATISTIC() [7/34]

STATISTIC	(	NumCmps	,
		"Number of comparisons propagated"
	)

STATISTIC() [8/34]

STATISTIC	(	NumDeadCases	,
		"Number of switch cases removed"
	)

STATISTIC() [9/34]

STATISTIC	(	NumMemAccess	,
		"Number of memory access targets propagated"
	)

STATISTIC() [10/34]

STATISTIC	(	NumMinMax	,
		"Number of llvm.{min,max} intrinsics removed"	[us]
	)

STATISTIC() [11/34]

STATISTIC	(	NumMulNSW	,
		"Number of no-signed-wrap deductions for mul"
	)

STATISTIC() [12/34]

STATISTIC	(	NumMulNUW	,
		"Number of no-unsigned-wrap deductions for mul"
	)

STATISTIC() [13/34]

STATISTIC	(	NumMulNW	,
		"Number of no-wrap deductions for mul"
	)

STATISTIC() [14/34]

STATISTIC	(	NumNonNull	,
		"Number of function pointer arguments marked non-null"
	)

STATISTIC() [15/34]

STATISTIC	(	NumNSW	,
		"Number of no-signed-wrap deductions"
	)

STATISTIC() [16/34]

STATISTIC	(	NumNUW	,
		"Number of no-unsigned-wrap deductions"
	)

STATISTIC() [17/34]

STATISTIC	(	NumNW	,
		"Number of no-wrap deductions"
	)

STATISTIC() [18/34]

STATISTIC	(	NumOverflows	,
		"Number of overflow checks removed"
	)

STATISTIC() [19/34]

STATISTIC	(	NumPhiCommon	,
		"Number of phis deleted via common incoming value"
	)

STATISTIC() [20/34]

STATISTIC	(	NumPhis	,
		"Number of phis propagated"
	)

STATISTIC() [21/34]

STATISTIC	(	NumReturns	,
		"Number of return values propagated"
	)

STATISTIC() [22/34]

STATISTIC	(	NumSaturating	,
		"Number of saturating arithmetics converted to normal arithmetics"
	)

STATISTIC() [23/34]

STATISTIC	(	NumSDivs	,
		"Number of sdiv converted to udiv"
	)

STATISTIC() [24/34]

STATISTIC	(	NumSDivSRemsNarrowed	,
		"Number of sdivs/srems whose width was decreased"
	)

STATISTIC() [25/34]

STATISTIC	(	NumSelects	,
		"Number of selects propagated"
	)

STATISTIC() [26/34]

STATISTIC	(	NumSExt	,
		"Number of sext converted to zext"
	)

STATISTIC() [27/34]

STATISTIC	(	NumShlNSW	,
		"Number of no-signed-wrap deductions for shl"
	)

STATISTIC() [28/34]

STATISTIC	(	NumShlNUW	,
		"Number of no-unsigned-wrap deductions for shl"
	)

STATISTIC() [29/34]

STATISTIC	(	NumShlNW	,
		"Number of no-wrap deductions for shl"
	)

STATISTIC() [30/34]

STATISTIC	(	NumSRems	,
		"Number of srem converted to urem"
	)

STATISTIC() [31/34]

STATISTIC	(	NumSubNSW	,
		"Number of no-signed-wrap deductions for sub"
	)

STATISTIC() [32/34]

STATISTIC	(	NumSubNUW	,
		"Number of no-unsigned-wrap deductions for sub"
	)

STATISTIC() [33/34]

STATISTIC	(	NumSubNW	,
		"Number of no-wrap deductions for sub"
	)

STATISTIC() [34/34]

STATISTIC	(	NumUDivURemsNarrowed	,
		"Number of udivs/urems whose width was decreased"
	)

willNotOverflow()

static bool willNotOverflow ( BinaryOpIntrinsic *  BO, LazyValueInfo *  LVI  )

static

Definition at line 416 of file CorrelatedValuePropagation.cpp.

References llvm::ConstantRange::contains(), llvm::BinaryOpIntrinsic::getBinaryOp(), llvm::LazyValueInfo::getConstantRange(), llvm::BinaryOpIntrinsic::getLHS(), llvm::BinaryOpIntrinsic::getNoWrapKind(), llvm::BinaryOpIntrinsic::getRHS(), and llvm::ConstantRange::makeGuaranteedNoWrapRegion().

Referenced by processCallSite().

Variable Documentation

false

correlated Value false

Definition at line 123 of file CorrelatedValuePropagation.cpp.

propagation

correlated propagation

Definition at line 122 of file CorrelatedValuePropagation.cpp.

Propagation

correlated Value Propagation

Definition at line 123 of file CorrelatedValuePropagation.cpp.