InstCombineCalls.cpp File Reference

#include "InstCombineInternal.h"
#include "llvm/ADT/APFloat.h"
#include "llvm/ADT/APInt.h"
#include "llvm/ADT/APSInt.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/STLFunctionalExtras.h"
#include "llvm/ADT/SmallBitVector.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/AssumeBundleQueries.h"
#include "llvm/Analysis/AssumptionCache.h"
#include "llvm/Analysis/InstructionSimplify.h"
#include "llvm/Analysis/Loads.h"
#include "llvm/Analysis/MemoryBuiltins.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/Analysis/VectorUtils.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Constant.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/InlineAsm.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/IntrinsicsAArch64.h"
#include "llvm/IR/IntrinsicsAMDGPU.h"
#include "llvm/IR/IntrinsicsARM.h"
#include "llvm/IR/IntrinsicsHexagon.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Metadata.h"
#include "llvm/IR/PatternMatch.h"
#include "llvm/IR/Statepoint.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/User.h"
#include "llvm/IR/Value.h"
#include "llvm/IR/ValueHandle.h"
#include "llvm/Support/AtomicOrdering.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/KnownBits.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Transforms/InstCombine/InstCombiner.h"
#include "llvm/Transforms/Utils/AssumeBundleBuilder.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/Transforms/Utils/SimplifyLibCalls.h"
#include <algorithm>
#include <cassert>
#include <cstdint>
#include <optional>
#include <utility>
#include <vector>
#include "llvm/Transforms/Utils/InstructionWorklist.h"

Go to the source code of this file.

Namespaces
namespace	llvm
	This is an optimization pass for GlobalISel generic memory operations.

Macros
#define	DEBUG_TYPE   "instcombine"

Functions
	STATISTIC (NumSimplified, "Number of library calls simplified")
static Type *	getPromotedType (Type *Ty)
	Return the specified type promoted as it would be to pass though a va_arg area.
static bool	hasUndefSource (AnyMemTransferInst *MI)
	Recognize a memcpy/memmove from a trivially otherwise unused alloca.
static Instruction *	simplifyInvariantGroupIntrinsic (IntrinsicInst &II, InstCombinerImpl &IC)
	This function transforms launder.invariant.group and strip.invariant.group like: launder(launder(x)) -> launder(x) (the result is not the argument) launder(strip(x)) -> launder(x) strip(strip(x)) -> strip(x) (the result is not the argument) strip(launder(x)) -> strip(x) This is legal because it preserves the most recent information about the presence or absence of invariant.group.
static Instruction *	foldCttzCtlz (IntrinsicInst &II, InstCombinerImpl &IC)
static Instruction *	foldCtpop (IntrinsicInst &II, InstCombinerImpl &IC)
static Value *	simplifyNeonTbl1 (const IntrinsicInst &II, InstCombiner::BuilderTy &Builder)
	Convert a table lookup to shufflevector if the mask is constant.
static bool	haveSameOperands (const IntrinsicInst &I, const IntrinsicInst &E, unsigned NumOperands)
static bool	removeTriviallyEmptyRange (IntrinsicInst &EndI, InstCombinerImpl &IC, std::function< bool(const IntrinsicInst &)> IsStart)
static CallInst *	canonicalizeConstantArg0ToArg1 (CallInst &Call)
static Instruction *	createOverflowTuple (IntrinsicInst *II, Value *Result, Constant *Overflow)
	Creates a result tuple for an overflow intrinsic II with a given Result and a constant Overflow value.
static bool	inputDenormalIsIEEE (const Function &F, const Type *Ty)
static bool	inputDenormalIsDAZ (const Function &F, const Type *Ty)
static FCmpInst::Predicate	fpclassTestIsFCmp0 (FPClassTest Mask, const Function &F, Type *Ty)
static std::optional< bool >	getKnownSign (Value *Op, Instruction *CxtI, const DataLayout &DL, AssumptionCache *AC, DominatorTree *DT)
static Instruction *	moveAddAfterMinMax (IntrinsicInst *II, InstCombiner::BuilderTy &Builder)
	Try to canonicalize min/max(X + C0, C1) as min/max(X, C1 - C0) + C0.
static Instruction *	foldClampRangeOfTwo (IntrinsicInst *II, InstCombiner::BuilderTy &Builder)
	If we have a clamp pattern like max (min X, 42), 41 – where the output can only be one of two possible constant values – turn that into a select of constants.
static Value *	reassociateMinMaxWithConstants (IntrinsicInst *II, IRBuilderBase &Builder)
	If this min/max has a constant operand and an operand that is a matching min/max with a constant operand, constant-fold the 2 constant operands.
static Instruction *	reassociateMinMaxWithConstantInOperand (IntrinsicInst *II, InstCombiner::BuilderTy &Builder)
	If this min/max has a matching min/max operand with a constant, try to push the constant operand into this instruction.
static Instruction *	factorizeMinMaxTree (IntrinsicInst *II)
	Reduce a sequence of min/max intrinsics with a common operand.
static Instruction *	foldShuffledIntrinsicOperands (IntrinsicInst *II, InstCombiner::BuilderTy &Builder)
	If all arguments of the intrinsic are unary shuffles with the same mask, try to shuffle after the intrinsic.
template<Intrinsic::ID IntrID>
static Instruction *	foldBitOrderCrossLogicOp (Value *V, InstCombiner::BuilderTy &Builder)
	Fold the following cases and accepts bswap and bitreverse intrinsics: bswap(logic_op(bswap(x), y)) --> logic_op(x, bswap(y)) bswap(logic_op(bswap(x), bswap(y))) --> logic_op(x, y) (ignores multiuse)
static IntrinsicInst *	findInitTrampolineFromAlloca (Value *TrampMem)
static IntrinsicInst *	findInitTrampolineFromBB (IntrinsicInst *AdjustTramp, Value *TrampMem)
static IntrinsicInst *	findInitTrampoline (Value *Callee)

Variables
static cl::opt< unsigned >	GuardWideningWindow ("instcombine-guard-widening-window", cl::init(3), cl::desc("How wide an instruction window to bypass looking for " "another guard"))

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "instcombine"

Definition at line 77 of file InstCombineCalls.cpp.

Function Documentation

canonicalizeConstantArg0ToArg1()

static CallInst * canonicalizeConstantArg0ToArg1 ( CallInst &  Call )

static

Definition at line 784 of file InstCombineCalls.cpp.

References assert().

Referenced by llvm::InstCombinerImpl::visitCallInst().

createOverflowTuple()

static Instruction * createOverflowTuple ( IntrinsicInst *  II, Value *  Result, Constant *  Overflow  )

static

Creates a result tuple for an overflow intrinsic II with a given Result and a constant Overflow value.

Definition at line 797 of file InstCombineCalls.cpp.

References llvm::InsertValueInst::Create(), llvm::ConstantStruct::get(), llvm::PoisonValue::get(), llvm::Value::getType(), and Struct.

factorizeMinMaxTree()

static Instruction * factorizeMinMaxTree ( IntrinsicInst *  II )

static

Reduce a sequence of min/max intrinsics with a common operand.

Definition at line 1222 of file InstCombineCalls.cpp.

References A, assert(), B, llvm::CallingConv::C, llvm::CallInst::Create(), D, llvm::CallBase::getArgOperand(), llvm::Intrinsic::getDeclaration(), llvm::IntrinsicInst::getIntrinsicID(), llvm::Instruction::getModule(), llvm::Value::getType(), llvm::Value::hasOneUse(), LHS, llvm::Mod, and RHS.

Referenced by llvm::InstCombinerImpl::visitCallInst().

findInitTrampoline()

static IntrinsicInst * findInitTrampoline ( Value *  Callee )

static

Definition at line 3318 of file InstCombineCalls.cpp.

References Callee, findInitTrampolineFromAlloca(), findInitTrampolineFromBB(), llvm::IntrinsicInst::getIntrinsicID(), llvm::User::getOperand(), and IT.

findInitTrampolineFromAlloca()

static IntrinsicInst * findInitTrampolineFromAlloca ( Value *  TrampMem )

static

Definition at line 3258 of file InstCombineCalls.cpp.

References llvm::IntrinsicInst::getIntrinsicID(), llvm::User::getOperand(), llvm::Value::stripPointerCasts(), and llvm::Value::users().

Referenced by findInitTrampoline().

findInitTrampolineFromBB()

static IntrinsicInst * findInitTrampolineFromBB ( IntrinsicInst *  AdjustTramp, Value *  TrampMem  )

static

Definition at line 3297 of file InstCombineCalls.cpp.

References llvm::BasicBlock::begin(), E, llvm::IntrinsicInst::getIntrinsicID(), llvm::ilist_node_impl< OptionsT >::getIterator(), llvm::User::getOperand(), llvm::Instruction::getParent(), I, and llvm::Instruction::mayWriteToMemory().

Referenced by findInitTrampoline().

foldBitOrderCrossLogicOp()

template<Intrinsic::ID IntrID>

static Instruction * foldBitOrderCrossLogicOp ( Value *  V, InstCombiner::BuilderTy &  Builder  )

static

Fold the following cases and accepts bswap and bitreverse intrinsics: bswap(logic_op(bswap(x), y)) --> logic_op(x, bswap(y)) bswap(logic_op(bswap(x), bswap(y))) --> logic_op(x, y) (ignores multiuse)

Definition at line 1332 of file InstCombineCalls.cpp.

References Builder, llvm::BinaryOperator::Create(), llvm::PatternMatch::m_BitwiseLogic(), llvm::PatternMatch::m_OneUse(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), X, and Y.

foldClampRangeOfTwo()

static Instruction * foldClampRangeOfTwo ( IntrinsicInst *  II, InstCombiner::BuilderTy &  Builder  )

static

If we have a clamp pattern like max (min X, 42), 41 – where the output can only be one of two possible constant values – turn that into a select of constants.

Definition at line 1131 of file InstCombineCalls.cpp.

References llvm::CmpInst::BAD_ICMP_PREDICATE, Builder, llvm::SelectInst::Create(), llvm::ConstantInt::get(), llvm::CallBase::getArgOperand(), llvm::IntrinsicInst::getIntrinsicID(), llvm::Value::getType(), llvm::Value::hasOneUse(), llvm::CmpInst::ICMP_SGT, llvm::CmpInst::ICMP_SLT, llvm::CmpInst::ICMP_UGT, llvm::CmpInst::ICMP_ULT, llvm_unreachable, llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_SMax(), llvm::PatternMatch::m_SMin(), llvm::PatternMatch::m_UMax(), llvm::PatternMatch::m_UMin(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), and X.

Referenced by llvm::InstCombinerImpl::visitCallInst().

foldCtpop()

static Instruction * foldCtpop ( IntrinsicInst &  II, InstCombinerImpl &  IC  )

static

Definition at line 608 of file InstCombineCalls.cpp.

References assert(), llvm::BitWidth, llvm::InstCombiner::Builder, llvm::InstCombiner::computeKnownBits(), llvm::KnownBits::countMaxPopulation(), llvm::KnownBits::countMinPopulation(), llvm::CallInst::Create(), llvm::CastInst::Create(), llvm::IRBuilderBase::CreateCall(), llvm::IRBuilderBase::CreateICmp(), llvm::IRBuilderBase::CreateSub(), llvm::IRBuilderBase::CreateUnaryIntrinsic(), F, llvm::ConstantAsMetadata::get(), llvm::MDNode::get(), llvm::ConstantInt::get(), llvm::CallBase::getArgOperand(), llvm::Value::getContext(), llvm::Intrinsic::getDeclaration(), llvm::IRBuilderBase::getFalse(), llvm::IntrinsicInst::getIntrinsicID(), llvm::Instruction::getMetadata(), llvm::Instruction::getModule(), llvm::Constant::getNullValue(), llvm::Type::getScalarSizeInBits(), llvm::Type::getScalarType(), llvm::Value::getType(), llvm::Value::hasOneUse(), llvm::CmpInst::ICMP_NE, llvm::InstCombiner::isKnownToBeAPowerOfTwo(), IT, LowAndHigh, llvm::PatternMatch::m_Add(), llvm::PatternMatch::m_AllOnes(), llvm::PatternMatch::m_BitReverse(), llvm::PatternMatch::m_BSwap(), llvm::PatternMatch::m_c_And(), llvm::PatternMatch::m_c_Or(), llvm::PatternMatch::m_Deferred(), llvm::PatternMatch::m_FShl(), llvm::PatternMatch::m_FShr(), llvm::PatternMatch::m_Neg(), llvm::PatternMatch::m_Not(), llvm::PatternMatch::m_OneUse(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::m_ZExt(), llvm::PatternMatch::match(), llvm::InstCombiner::replaceInstUsesWith(), llvm::InstCombiner::replaceOperand(), llvm::Instruction::setMetadata(), X, Y, and llvm::KnownBits::Zero.

Referenced by llvm::InstCombinerImpl::visitCallInst().

foldCttzCtlz()

static Instruction * foldCttzCtlz ( IntrinsicInst &  II, InstCombinerImpl &  IC  )

static

Definition at line 508 of file InstCombineCalls.cpp.

References assert(), llvm::InstCombiner::Builder, llvm::CallingConv::C, llvm::InstCombiner::computeKnownBits(), llvm::KnownBits::countMaxLeadingZeros(), llvm::KnownBits::countMaxTrailingZeros(), llvm::KnownBits::countMinLeadingZeros(), llvm::KnownBits::countMinTrailingZeros(), llvm::CallInst::Create(), llvm::IRBuilderBase::CreateBinaryIntrinsic(), llvm::BinaryOperator::CreateNot(), llvm::IRBuilderBase::CreateZExt(), F, llvm::SelectPatternResult::Flavor, llvm::ConstantAsMetadata::get(), llvm::MDNode::get(), llvm::ConstantInt::get(), llvm::CallBase::getArgOperand(), llvm::InstCombiner::getAssumptionCache(), llvm::Value::getContext(), llvm::InstCombiner::getDataLayout(), llvm::Intrinsic::getDeclaration(), llvm::InstCombiner::getDominatorTree(), llvm::IntrinsicInst::getIntrinsicID(), llvm::Instruction::getMetadata(), llvm::Instruction::getModule(), llvm::Constant::getNullValue(), llvm::Type::getScalarType(), llvm::IRBuilderBase::getTrue(), llvm::Value::getType(), llvm::Type::isIntOrIntVectorTy(), llvm::isKnownNonZero(), llvm::APInt::isZero(), IT, LowAndHigh, llvm::PatternMatch::m_BitReverse(), llvm::PatternMatch::m_Neg(), llvm::PatternMatch::m_One(), llvm::PatternMatch::m_OneUse(), llvm::PatternMatch::m_SExt(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::m_Zero(), llvm::PatternMatch::m_ZExt(), llvm::PatternMatch::match(), llvm::matchSelectPattern(), llvm::KnownBits::One, llvm::InstCombiner::replaceInstUsesWith(), llvm::InstCombiner::replaceOperand(), llvm::Instruction::setMetadata(), llvm::SPF_ABS, llvm::SPF_NABS, X, and Y.

Referenced by llvm::InstCombinerImpl::visitCallInst().

foldShuffledIntrinsicOperands()

static Instruction * foldShuffledIntrinsicOperands ( IntrinsicInst *  II, InstCombiner::BuilderTy &  Builder  )

static

If all arguments of the intrinsic are unary shuffles with the same mask, try to shuffle after the intrinsic.

Definition at line 1281 of file InstCombineCalls.cpp.

References llvm::CallBase::arg_size(), llvm::CallBase::args(), Builder, llvm::CallBase::getArgOperand(), llvm::IntrinsicInst::getIntrinsicID(), llvm::PatternMatch::m_Shuffle(), llvm::PatternMatch::m_Undef(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), llvm::none_of(), and X.

Referenced by llvm::InstCombinerImpl::visitCallInst().

fpclassTestIsFCmp0()

static FCmpInst::Predicate fpclassTestIsFCmp0 ( FPClassTest  Mask, const Function &  F, Type *  Ty  )

static

Returns

the compare predicate type if the test performed by llvm.is.fpclass(x, Mask) is equivalent to fcmp o__ x, 0.0 with the floating-point environment assumed for F for type Ty

Definition at line 829 of file InstCombineCalls.cpp.

References llvm::CmpInst::BAD_FCMP_PREDICATE, F, llvm::CmpInst::FCMP_OEQ, llvm::CmpInst::FCMP_OGE, llvm::CmpInst::FCMP_OGT, llvm::CmpInst::FCMP_OLE, llvm::CmpInst::FCMP_OLT, llvm::CmpInst::FCMP_ONE, llvm::fcNan, llvm::fcNegative, llvm::fcNegInf, llvm::fcNegNormal, llvm::fcNegSubnormal, llvm::fcNegZero, llvm::fcPosInf, llvm::fcPositive, llvm::fcPosNormal, llvm::fcPosSubnormal, llvm::fcPosZero, llvm::fcSubnormal, llvm::fcZero, inputDenormalIsDAZ(), and inputDenormalIsIEEE().

getKnownSign()

static std::optional< bool > getKnownSign ( Value *  Op, Instruction *  CxtI, const DataLayout &  DL, AssumptionCache *  AC, DominatorTree *  DT  )

static

Definition at line 1011 of file InstCombineCalls.cpp.

References llvm::computeKnownBits(), DL, llvm::Constant::getNullValue(), llvm::CmpInst::ICMP_SLT, llvm::isImpliedByDomCondition(), llvm::KnownBits::isNegative(), llvm::KnownBits::isNonNegative(), llvm::PatternMatch::m_NSWSub(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), X, and Y.

Referenced by llvm::InstCombinerImpl::visitCallInst().

getPromotedType()

static Type * getPromotedType ( Type *  Ty )

static

Return the specified type promoted as it would be to pass though a va_arg area.

Definition at line 99 of file InstCombineCalls.cpp.

References llvm::Type::getContext(), and llvm::Type::getInt32Ty().

hasUndefSource()

static bool hasUndefSource ( AnyMemTransferInst *  MI )

static

Recognize a memcpy/memmove from a trivially otherwise unused alloca.

TODO: This should probably be integrated with visitAllocSites, but that requires a deeper change to allow either unread or unwritten objects.

Definition at line 110 of file InstCombineCalls.cpp.

References MI.

Referenced by llvm::InstCombinerImpl::SimplifyAnyMemTransfer().

haveSameOperands()

static bool haveSameOperands ( const IntrinsicInst &  I, const IntrinsicInst &  E, unsigned  NumOperands  )

static

Definition at line 729 of file InstCombineCalls.cpp.

References assert(), E, and I.

Referenced by removeTriviallyEmptyRange().

inputDenormalIsDAZ()

static bool inputDenormalIsDAZ ( const Function &  F, const Type *  Ty  )

static

Definition at line 821 of file InstCombineCalls.cpp.

References F, llvm::Type::getFltSemantics(), and llvm::Type::getScalarType().

Referenced by fpclassTestIsFCmp0().

inputDenormalIsIEEE()

static bool inputDenormalIsIEEE ( const Function &  F, const Type *  Ty  )

static

Definition at line 816 of file InstCombineCalls.cpp.

References F, llvm::Type::getFltSemantics(), llvm::Type::getScalarType(), and llvm::DenormalMode::IEEE.

moveAddAfterMinMax()

static Instruction * moveAddAfterMinMax ( IntrinsicInst *  II, InstCombiner::BuilderTy &  Builder  )

static

Try to canonicalize min/max(X + C0, C1) as min/max(X, C1 - C0) + C0.

This can trigger other combines.

Definition at line 1030 of file InstCombineCalls.cpp.

References llvm::Add, assert(), Builder, llvm::ConstantInt::get(), llvm::CallBase::getArgOperand(), llvm::IntrinsicInst::getIntrinsicID(), llvm::Value::getType(), llvm::PatternMatch::m_Add(), llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_OneUse(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), llvm::APInt::ssub_ov(), llvm::APInt::usub_ov(), and X.

Referenced by llvm::InstCombinerImpl::visitCallInst().

reassociateMinMaxWithConstantInOperand()

static Instruction * reassociateMinMaxWithConstantInOperand ( IntrinsicInst *  II, InstCombiner::BuilderTy &  Builder  )

static

If this min/max has a matching min/max operand with a constant, try to push the constant operand into this instruction.

This can enable more folds.

Definition at line 1194 of file InstCombineCalls.cpp.

References Builder, llvm::CallingConv::C, llvm::CallInst::Create(), llvm::Intrinsic::getDeclaration(), llvm::IntrinsicInst::getIntrinsicID(), llvm::Instruction::getModule(), llvm::Value::getType(), llvm::PatternMatch::m_c_MaxOrMin(), llvm::PatternMatch::m_CombineAnd(), llvm::PatternMatch::m_ImmConstant(), llvm::PatternMatch::m_Instruction(), llvm::PatternMatch::m_MaxOrMin(), llvm::PatternMatch::m_OneUse(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), llvm::Value::takeName(), X, and Y.

Referenced by llvm::InstCombinerImpl::visitCallInst().

reassociateMinMaxWithConstants()

static Value * reassociateMinMaxWithConstants ( IntrinsicInst *  II, IRBuilderBase &  Builder  )

static

If this min/max has a constant operand and an operand that is a matching min/max with a constant operand, constant-fold the 2 constant operands.

Definition at line 1171 of file InstCombineCalls.cpp.

References Builder, llvm::CallBase::getArgOperand(), llvm::IntrinsicInst::getIntrinsicID(), llvm::MinMaxIntrinsic::getPredicate(), llvm::Value::getType(), LHS, llvm::PatternMatch::m_ImmConstant(), and llvm::PatternMatch::match().

Referenced by llvm::InstCombinerImpl::visitCallInst().

removeTriviallyEmptyRange()

static bool removeTriviallyEmptyRange ( IntrinsicInst &  EndI, InstCombinerImpl &  IC, std::function< bool(const IntrinsicInst &)>  IsStart  )

static

Definition at line 749 of file InstCombineCalls.cpp.

References llvm::CallBase::arg_size(), llvm::InstCombinerImpl::eraseInstFromFunction(), llvm::IntrinsicInst::getIntrinsicID(), llvm::Instruction::getParent(), haveSameOperands(), I, and llvm::BasicBlock::rend().

Referenced by llvm::InstCombinerImpl::visitCallInst(), and llvm::InstCombinerImpl::visitVAEndInst().

simplifyInvariantGroupIntrinsic()

static Instruction * simplifyInvariantGroupIntrinsic ( IntrinsicInst &  II, InstCombinerImpl &  IC  )

static

This function transforms launder.invariant.group and strip.invariant.group like: launder(launder(x)) -> launder(x) (the result is not the argument) launder(strip(x)) -> launder(x) strip(strip(x)) -> strip(x) (the result is not the argument) strip(launder(x)) -> strip(x) This is legal because it preserves the most recent information about the presence or absence of invariant.group.

Definition at line 476 of file InstCombineCalls.cpp.

References Arg, llvm::InstCombiner::Builder, llvm::IRBuilderBase::CreateAddrSpaceCast(), llvm::IRBuilderBase::CreateBitCast(), llvm::IRBuilderBase::CreateLaunderInvariantGroup(), llvm::IRBuilderBase::CreateStripInvariantGroup(), llvm::CallBase::getArgOperand(), llvm::IntrinsicInst::getIntrinsicID(), llvm::Type::getPointerAddressSpace(), llvm::Value::getType(), Intr, and llvm_unreachable.

Referenced by llvm::InstCombinerImpl::visitCallInst().

simplifyNeonTbl1()

static Value * simplifyNeonTbl1 ( const IntrinsicInst &  II, InstCombiner::BuilderTy &  Builder  )

static

Convert a table lookup to shufflevector if the mask is constant.

This could benefit tbl1 if the mask is { 7,6,5,4,3,2,1,0 }, in which case we could lower the shufflevector with rev64 instructions as it's actually a byte reverse.

Definition at line 693 of file InstCombineCalls.cpp.

References Builder, llvm::CallingConv::C, llvm::CallBase::getArgOperand(), llvm::Constant::getNullValue(), llvm::Value::getType(), and I.

Referenced by llvm::InstCombinerImpl::visitCallInst().

STATISTIC()

STATISTIC	(	NumSimplified	,
		"Number of library calls simplified"
	)

Variable Documentation

GuardWideningWindow

cl::opt< unsigned > GuardWideningWindow("instcombine-guard-widening-window", cl::init(3), cl::desc("How wide an instruction window to bypass looking for " "another guard")) ( "instcombine-guard-widening-window"  , cl::init(3)  , cl::desc("How wide an instruction window to bypass looking for " "another guard")    )

static

Referenced by llvm::InstCombinerImpl::visitCallInst().