InstructionCombining.cpp File Reference (original) (raw)

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

Macros
#define	DEBUG_TYPE "instcombine"

Functions
	STATISTIC (NumWorklistIterations, "Number of instruction combining iterations performed")
	STATISTIC (NumOneIteration, "Number of functions with one iteration")
	STATISTIC (NumTwoIterations, "Number of functions with two iterations")
	STATISTIC (NumThreeIterations, "Number of functions with three iterations")
	STATISTIC (NumFourOrMoreIterations, "Number of functions with four or more iterations")
	STATISTIC (NumCombined, "Number of insts combined")
	STATISTIC (NumConstProp, "Number of constant folds")
	STATISTIC (NumDeadInst, "Number of dead inst eliminated")
	STATISTIC (NumSunkInst, "Number of instructions sunk")
	STATISTIC (NumExpand, "Number of expansions")
	STATISTIC (NumFactor, "Number of factorizations")
	STATISTIC (NumReassoc, "Number of reassociations")
	DEBUG_COUNTER (VisitCounter, "instcombine-visit", "Controls which instructions are visited")
static bool	maintainNoSignedWrap (BinaryOperator &I, Value B, Value C)
static bool	hasNoUnsignedWrap (BinaryOperator &I)
static bool	hasNoSignedWrap (BinaryOperator &I)
static void	ClearSubclassDataAfterReassociation (BinaryOperator &I)
	Conservatively clears subclassOptionalData after a reassociation or commutation.
static bool	simplifyAssocCastAssoc (BinaryOperator *BinOp1, InstCombinerImpl &IC)
	Combine constant operands of associative operations either before or after a cast to eliminate one of the associative operations: (op (cast (op X, C2)), C1) --> (cast (op X, op (C1, C2))) (op (cast (op X, C2)), C1) --> (op (cast X), op (C1, C2))
static bool	leftDistributesOverRight (Instruction::BinaryOps LOp, Instruction::BinaryOps ROp)
	Return whether "X LOp (Y ROp Z)" is always equal to "(X LOp Y) ROp (X LOp Z)".
static bool	rightDistributesOverLeft (Instruction::BinaryOps LOp, Instruction::BinaryOps ROp)
	Return whether "(X LOp Y) ROp Z" is always equal to "(X ROp Z) LOp (Y ROp Z)".
static Value *	getIdentityValue (Instruction::BinaryOps Opcode, Value *V)
	This function returns identity value for given opcode, which can be used to factor patterns like (X * 2) + X ==> (X * 2) + (X * 1) ==> X * (2 + 1).
static Instruction::BinaryOps	getBinOpsForFactorization (Instruction::BinaryOps TopOpcode, BinaryOperator Op, Value &LHS, Value &RHS, BinaryOperator OtherOp)
	This function predicates factorization using distributive laws.
static Value *	tryFactorization (BinaryOperator &I, const SimplifyQuery &SQ, InstCombiner::BuilderTy &Builder, Instruction::BinaryOps InnerOpcode, Value A, Value B, Value C, Value D)
	This tries to simplify binary operations by factorizing out common terms (e.
static std::optional< std::pair< Value , Value > >	matchSymmetricPhiNodesPair (PHINode LHS, PHINode RHS)
static Value *	simplifyOperationIntoSelectOperand (Instruction &I, SelectInst *SI, bool IsTrueArm)
static Value *	foldOperationIntoSelectOperand (Instruction &I, SelectInst SI, Value NewOp, InstCombiner &IC)
static Value *	simplifyInstructionWithPHI (Instruction &I, PHINode PN, Value InValue, BasicBlock *InBB, const DataLayout &DL, const SimplifyQuery SQ)
static bool	shouldMergeGEPs (GEPOperator &GEP, GEPOperator &Src)
static Constant *	constantFoldBinOpWithSplat (unsigned Opcode, Constant Vector, Constant Splat, bool SplatLHS, const DataLayout &DL)
static GEPNoWrapFlags	getMergedGEPNoWrapFlags (GEPOperator &GEP1, GEPOperator &GEP2)
	Determine nowrap flags for (gep (gep p, x), y) to (gep p, (x + y)) transform.
static Instruction *	foldSelectGEP (GetElementPtrInst &GEP, InstCombiner::BuilderTy &Builder)
	Thread a GEP operation with constant indices through the constant true/false arms of a select.
static Instruction *	canonicalizeGEPOfConstGEPI8 (GetElementPtrInst &GEP, GEPOperator *Src, InstCombinerImpl &IC)
static Instruction *	combineConstantOffsets (GetElementPtrInst &GEP, InstCombinerImpl &IC)
	Combine constant offsets separated by variable offsets.
static bool	shouldCanonicalizeGEPToPtrAdd (GetElementPtrInst &GEP)
	Return true if we should canonicalize the gep to an i8 ptradd.
static Instruction *	foldGEPOfPhi (GetElementPtrInst &GEP, PHINode *PN, IRBuilderBase &Builder)
static bool	isNeverEqualToUnescapedAlloc (Value V, const TargetLibraryInfo &TLI, Instruction AI)
static bool	isRemovableWrite (CallBase &CB, Value *UsedV, const TargetLibraryInfo &TLI)
	Given a call CB which uses an address UsedV, return true if we can prove the call's only possible effect is storing to V.
static std::optional< ModRefInfo >	isAllocSiteRemovable (Instruction *AI, SmallVectorImpl< WeakTrackingVH > &Users, const TargetLibraryInfo &TLI, bool KnowInit)
static Instruction *	tryToMoveFreeBeforeNullTest (CallInst &FI, const DataLayout &DL)
	Move the call to free before a NULL test.
static Value *	simplifySwitchOnSelectUsingRanges (SwitchInst &SI, SelectInst *Select, bool IsTrueArm)
static Value *	foldFrexpOfSelect (ExtractValueInst &EV, IntrinsicInst FrexpCall, SelectInst SelectInst, InstCombiner::BuilderTy &Builder)
static bool	isCatchAll (EHPersonality Personality, Constant *TypeInfo)
	Return 'true' if the given typeinfo will match anything.
static bool	shorter_filter (const Value LHS, const Value RHS)
static bool	isUsedWithinShuffleVector (Value *V)
static bool	SoleWriteToDeadLocal (Instruction *I, TargetLibraryInfo &TLI)
	Check for case where the call writes to an otherwise dead alloca.
static bool	combineInstructionsOverFunction (Function &F, InstructionWorklist &Worklist, AliasAnalysis AA, AssumptionCache &AC, TargetLibraryInfo &TLI, TargetTransformInfo &TTI, DominatorTree &DT, OptimizationRemarkEmitter &ORE, BlockFrequencyInfo BFI, BranchProbabilityInfo BPI, ProfileSummaryInfo PSI, const InstCombineOptions &Opts)
	INITIALIZE_PASS_BEGIN (InstructionCombiningPass, "instcombine", "Combine redundant instructions", false, false) INITIALIZE_PASS_END(InstructionCombiningPass

Variables
static cl::opt< bool >	EnableCodeSinking ("instcombine-code-sinking", cl::desc("Enable code sinking"), cl::init(true))
static cl::opt< unsigned >	MaxSinkNumUsers ("instcombine-max-sink-users", cl::init(32), cl::desc("Maximum number of undroppable users for instruction sinking"))
static cl::opt< unsigned >	MaxArraySize ("instcombine-maxarray-size", cl::init(1024), cl::desc("Maximum array size considered when doing a combine"))
static cl::opt< unsigned >	ShouldLowerDbgDeclare ("instcombine-lower-dbg-declare", cl::Hidden, cl::init(true))
	instcombine
Combine redundant	instructions
Combine redundant	false

◆ DEBUG_TYPE

#define DEBUG_TYPE "instcombine"

◆ canonicalizeGEPOfConstGEPI8()

Definition at line 2690 of file InstructionCombining.cpp.

References llvm::sampleprof::Base, llvm::InstCombiner::Builder, llvm::cast(), llvm::GetElementPtrInst::Create(), llvm::IRBuilderBase::CreatePtrAdd(), DL, GEP, llvm::APInt::getBitWidth(), llvm::InstCombiner::getDataLayout(), llvm::IRBuilderBase::getInt(), llvm::Type::getScalarType(), llvm::GEPNoWrapFlags::inBounds(), llvm::isa(), llvm::APInt::isZero(), llvm::PatternMatch::m_AddLike(), llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_NUWAddLike(), llvm::PatternMatch::m_PtrAdd(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), llvm::GEPNoWrapFlags::none(), and llvm::GEPNoWrapFlags::noUnsignedWrap().

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

◆ ClearSubclassDataAfterReassociation()

◆ combineConstantOffsets()

Combine constant offsets separated by variable offsets.

ptradd (ptradd (ptradd p, C1), x), C2 -> ptradd (ptradd p, x), C1+C2

Definition at line 2735 of file InstructionCombining.cpp.

References llvm::GEPNoWrapFlags::all(), llvm::InstCombiner::Builder, llvm::IRBuilderBase::CreatePtrAdd(), DL, llvm::dyn_cast(), GEP, llvm::InstCombiner::getDataLayout(), llvm::IRBuilderBase::getInt(), llvm::GEPNoWrapFlags::intersectForOffsetAdd(), llvm::GEPNoWrapFlags::intersectForReassociate(), llvm::Offset, llvm::InstCombiner::replaceInstUsesWith(), and llvm::InstCombiner::replaceOperand().

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

◆ combineInstructionsOverFunction()

bool combineInstructionsOverFunction ( Function & F, InstructionWorklist & Worklist, AliasAnalysis * AA, AssumptionCache & AC, TargetLibraryInfo & TLI, TargetTransformInfo & TTI, DominatorTree & DT, OptimizationRemarkEmitter & ORE, BlockFrequencyInfo * BFI, BranchProbabilityInfo * BPI, ProfileSummaryInfo * PSI, const InstCombineOptions & Opts )	static

Builder - This is an IRBuilder that automatically inserts new instructions into the worklist when they are created.

Definition at line 5980 of file InstructionCombining.cpp.

References llvm::InstructionWorklist::add(), llvm::dbgs(), DL, llvm::dyn_cast(), F, I, LLVM_DEBUG, llvm::LowerDbgDeclare(), MaxArraySize, llvm::InstCombiner::MaxArraySizeForCombine, llvm::InstCombineOptions::MaxIterations, llvm::InstCombinerImpl::prepareWorklist(), llvm::AssumptionCache::registerAssumption(), llvm::reportFatalUsageError(), llvm::InstCombinerImpl::run(), ShouldLowerDbgDeclare, and llvm::InstCombineOptions::VerifyFixpoint.

Referenced by llvm::InstCombinePass::run(), and llvm::InstructionCombiningPass::runOnFunction().

◆ constantFoldBinOpWithSplat()

◆ DEBUG_COUNTER()

DEBUG_COUNTER	(	VisitCounter	,
"instcombine-visit"	,
"Controls which instructions are visited"	)

◆ foldFrexpOfSelect()

Definition at line 4498 of file InstructionCombining.cpp.

References Cond, llvm::Instruction::copyIRFlags(), llvm::frexp(), llvm::CallBase::getCalledFunction(), llvm::SelectInst::getCondition(), llvm::SelectInst::getFalseValue(), llvm::SelectInst::getTrueValue(), llvm::Value::hasOneUse(), llvm::PatternMatch::m_APFloat(), llvm::PatternMatch::match(), and llvm::APFloatBase::rmNearestTiesToEven.

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

◆ foldGEPOfPhi()

Definition at line 3071 of file InstructionCombining.cpp.

References llvm::PHINode::addIncoming(), assert(), llvm::cast(), llvm::dyn_cast(), E(), F, GEP, llvm::PHINode::getIncomingBlock(), llvm::User::getNumOperands(), llvm::User::getOperand(), llvm::GetElementPtrInst::getTypeAtIndex(), llvm::Value::hasOneUse(), I, llvm::Type::isStructTy(), llvm::User::op_begin(), llvm::User::op_end(), and llvm::User::operands().

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

◆ foldOperationIntoSelectOperand()

◆ foldSelectGEP()

◆ getBinOpsForFactorization()

This function predicates factorization using distributive laws.

By default, it just returns the 'Op' inputs. But for special-cases like 'add(shl(X, 5), ...)', this function will have TopOpcode == Instruction::Add and Op = shl(X, 5). The 'shl' is treated as the more general 'mul X, 32' to allow more factorization opportunities.

Definition at line 717 of file InstructionCombining.cpp.

References assert(), llvm::CallingConv::C, llvm::ConstantFoldBinaryInstruction(), llvm::BinaryOperator::getOpcode(), llvm::Instruction::isBitwiseLogicOp(), LHS, llvm::PatternMatch::m_ImmConstant(), llvm::PatternMatch::m_LShr(), llvm::PatternMatch::m_NonNegative(), llvm::PatternMatch::m_Shl(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::match(), and RHS.

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

◆ getIdentityValue()

◆ getMergedGEPNoWrapFlags()

◆ hasNoSignedWrap()

◆ hasNoUnsignedWrap()

◆ INITIALIZE_PASS_BEGIN()

◆ isAllocSiteRemovable()

Definition at line 3566 of file InstructionCombining.cpp.

References Access, assert(), llvm::cast(), llvm::dyn_cast(), llvm::SmallVectorTemplateCommon< T, typename >::empty(), llvm::getAllocationFamily(), llvm::getFreedOperand(), llvm::TargetLibraryInfo::getLibFunc(), llvm::User::getOperand(), llvm::LoadInst::getPointerOperand(), llvm::getReallocatedOperand(), llvm::TargetLibraryInfo::has(), I, II, llvm::ICmpInst::isEquality(), llvm::isModSet(), isNeverEqualToUnescapedAlloc(), llvm::APInt::isPowerOf2(), llvm::isRefSet(), isRemovableWrite(), llvm::LoadInst::isVolatile(), llvm_unreachable, llvm::PatternMatch::m_APInt(), llvm::PatternMatch::match(), MI, llvm::Mod, llvm::ModRef, llvm::NoModRef, llvm::SmallVectorImpl< T >::pop_back_val(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::Ref, Size, Users, and llvm::Value::users().

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

◆ isCatchAll()

Return 'true' if the given typeinfo will match anything.

Definition at line 4671 of file InstructionCombining.cpp.

References llvm::CoreCLR, llvm::GNU_Ada, llvm::GNU_C, llvm::GNU_C_SjLj, llvm::GNU_CXX, llvm::GNU_CXX_SjLj, llvm::GNU_ObjC, llvm::Constant::isNullValue(), llvm_unreachable, llvm::MSVC_CXX, llvm::MSVC_TableSEH, llvm::MSVC_X86SEH, llvm::Rust, llvm::Unknown, llvm::Wasm_CXX, llvm::XL_CXX, and llvm::ZOS_CXX.

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

◆ isNeverEqualToUnescapedAlloc()

◆ isRemovableWrite()

◆ isUsedWithinShuffleVector()

bool isUsedWithinShuffleVector ( Value * V)	static

◆ leftDistributesOverRight()

Return whether "X LOp (Y ROp Z)" is always equal to "(X LOp Y) ROp (X LOp Z)".

Definition at line 668 of file InstructionCombining.cpp.

◆ maintainNoSignedWrap()

◆ matchSymmetricPhiNodesPair()

◆ rightDistributesOverLeft()

◆ shorter_filter()

◆ shouldCanonicalizeGEPToPtrAdd()

Return true if we should canonicalize the gep to an i8 ptradd.

Definition at line 3042 of file InstructionCombining.cpp.

References llvm::any_of(), llvm::dyn_cast(), GEP, llvm::Type::isIntegerTy(), llvm::Type::isScalableTy(), llvm::PatternMatch::m_CombineOr(), llvm::PatternMatch::m_ConstantInt(), llvm::PatternMatch::m_Mul(), llvm::MIPatternMatch::m_OneUse(), llvm::PatternMatch::m_Shl(), llvm::PatternMatch::m_Value(), and llvm::PatternMatch::match().

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

◆ shouldMergeGEPs()

◆ simplifyAssocCastAssoc()

Combine constant operands of associative operations either before or after a cast to eliminate one of the associative operations: (op (cast (op X, C2)), C1) --> (cast (op X, op (C1, C2))) (op (cast (op X, C2)), C1) --> (op (cast X), op (C1, C2))

Definition at line 414 of file InstructionCombining.cpp.

References llvm::ConstantFoldBinaryOpOperands(), llvm::ConstantFoldCastOperand(), DL, llvm::Instruction::dropPoisonGeneratingFlags(), llvm::dyn_cast(), llvm::InstCombiner::getDataLayout(), llvm::BinaryOperator::getOpcode(), llvm::User::getOperand(), llvm::Value::getType(), llvm::Instruction::isBitwiseLogicOp(), llvm::PatternMatch::m_Constant(), llvm::PatternMatch::match(), and llvm::InstCombiner::replaceOperand().

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

◆ simplifyInstructionWithPHI()

Definition at line 1839 of file InstructionCombining.cpp.

References AbstractManglingParser< Derived, Alloc >::Ops, DL, llvm::dyn_cast(), llvm::ConstantInt::getBool(), llvm::ICmpInst::getCmpPredicate(), llvm::BranchInst::getCondition(), llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent(), llvm::BranchInst::getSuccessor(), llvm::BasicBlock::getTerminator(), llvm::SimplifyQuery::getWithInstruction(), I, llvm::BranchInst::isConditional(), llvm::isImpliedCondition(), llvm::PatternMatch::m_ConstantExpr(), llvm::PatternMatch::match(), and llvm::simplifyInstructionWithOperands().

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

◆ simplifyOperationIntoSelectOperand()

Definition at line 1748 of file InstructionCombining.cpp.

References AbstractManglingParser< Derived, Alloc >::Ops, llvm::Constant::getNullValue(), I, llvm::CmpInst::ICMP_EQ, llvm::CmpInst::ICMP_NE, llvm::isGuaranteedNotToBeUndefOrPoison(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_SpecificICmp(), llvm::PatternMatch::m_Value(), llvm::PatternMatch::m_ZExt(), llvm::PatternMatch::match(), and llvm::simplifyInstructionWithOperands().

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

◆ simplifySwitchOnSelectUsingRanges()

Definition at line 4255 of file InstructionCombining.cpp.

References llvm::CallingConv::C, llvm::ConstantRange::contains(), llvm::dyn_cast(), llvm::CmpInst::getInversePredicate(), llvm::PatternMatch::m_APInt(), llvm::PatternMatch::m_ICmp(), llvm::PatternMatch::m_Specific(), llvm::ConstantRange::makeExactICmpRegion(), llvm::PatternMatch::match(), Select, and X.

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

◆ SoleWriteToDeadLocal()

Check for case where the call writes to an otherwise dead alloca.

This shows up for unused out-params in idiomatic C/C++ code. Note that this helper only analyzes the write; doesn't check any other legality aspect.

Definition at line 5326 of file InstructionCombining.cpp.

References llvm::cast(), llvm::dyn_cast(), llvm::SmallVectorTemplateCommon< T, typename >::empty(), llvm::MemoryLocation::getForDest(), llvm::getUnderlyingObject(), I, llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::isa(), llvm::SmallVectorImpl< T >::pop_back_val(), and llvm::SmallVectorTemplateBase< T, bool >::push_back().

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

◆ STATISTIC() [1/12]

STATISTIC	(	NumCombined	,
"Number of insts combined"	)

◆ STATISTIC() [2/12]

STATISTIC	(	NumConstProp	,
"Number of constant folds"	)

◆ STATISTIC() [3/12]

STATISTIC	(	NumDeadInst	,
"Number of dead inst eliminated"	)

◆ STATISTIC() [4/12]

STATISTIC	(	NumExpand	,
"Number of expansions"	)

◆ STATISTIC() [5/12]

STATISTIC	(	NumFactor	,
"Number of factorizations"	)

◆ STATISTIC() [6/12]

STATISTIC	(	NumFourOrMoreIterations	,
"Number of functions with four or more iterations"	)

◆ STATISTIC() [7/12]

STATISTIC	(	NumOneIteration	,
"Number of functions with one iteration"	)

◆ STATISTIC() [8/12]

STATISTIC	(	NumReassoc	,
"Number of reassociations"	)

◆ STATISTIC() [9/12]

◆ STATISTIC() [10/12]

STATISTIC	(	NumThreeIterations	,
"Number of functions with three iterations"	)

◆ STATISTIC() [11/12]

STATISTIC	(	NumTwoIterations	,
"Number of functions with two iterations"	)

◆ STATISTIC() [12/12]

STATISTIC	(	NumWorklistIterations	,
"Number of instruction combining iterations performed"	)

◆ tryFactorization()

This tries to simplify binary operations by factorizing out common terms (e.

g. "(A*B)+(A*C)" -> "A*(B+C)").

Definition at line 745 of file InstructionCombining.cpp.

References A(), assert(), B(), llvm::CallingConv::C, llvm::cast(), D(), llvm::dyn_cast(), llvm::SimplifyQuery::getWithInstruction(), I, llvm::isa(), llvm::Instruction::isCommutative(), llvm::APInt::isMinSignedValue(), leftDistributesOverRight(), LHS, llvm::PatternMatch::m_APInt(), llvm::PatternMatch::match(), RHS, rightDistributesOverLeft(), llvm::simplifyBinOp(), std::swap(), and llvm::Value::takeName().

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

◆ tryToMoveFreeBeforeNullTest()

Move the call to free before a NULL test.

Check if this free is accessed after its argument has been test against NULL (property 0). If yes, it is legal to move this call in its predecessor block.

The move is performed only if the block containing the call to free will be removed, i.e.:

it has only one predecessor P, and P has two successors
it contains the call, noops, and an unconditional branch
its successor is the same as its predecessor's successor

The profitability is out-of concern here and this function should be called only if the caller knows this transformation would be profitable (e.g., for code size).

Definition at line 3879 of file InstructionCombining.cpp.

References assert(), DL, llvm::dyn_cast(), llvm::CallBase::getArgOperand(), llvm::CallBase::getAttributes(), llvm::Value::getContext(), llvm::Attribute::getDereferenceableBytes(), llvm::ilist_node_impl< OptionsT >::getIterator(), llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent(), llvm::BasicBlock::getSinglePredecessor(), llvm::BasicBlock::getTerminator(), llvm::CmpInst::ICMP_EQ, llvm::CmpInst::ICMP_NE, llvm::BasicBlock::instructionsWithoutDebug(), llvm::Attribute::isValid(), llvm::PatternMatch::m_Br(), llvm::PatternMatch::m_CombineOr(), llvm::PatternMatch::m_ICmp(), llvm::PatternMatch::m_Specific(), llvm::PatternMatch::m_UnconditionalBr(), llvm::PatternMatch::m_Zero(), llvm::make_early_inc_range(), llvm::PatternMatch::match(), llvm::CallBase::setAttributes(), and llvm::BasicBlock::size().

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

◆ EnableCodeSinking

cl::opt< bool > EnableCodeSinking("instcombine-code-sinking", cl::desc("Enable code sinking"), cl::init(true)) ( "instcombine-code-sinking" , cl::desc("Enable code sinking") , cl::init(true) )	static

◆ false

◆ instructions

◆ MaxArraySize

cl::opt< unsigned > MaxArraySize("instcombine-maxarray-size", cl::init(1024), cl::desc("Maximum array size considered when doing a combine")) ( "instcombine-maxarray-size" , cl::init(1024) , cl::desc("Maximum array size considered when doing a combine") )	static

◆ MaxSinkNumUsers

◆ ShouldLowerDbgDeclare

cl::opt< unsigned > ShouldLowerDbgDeclare("instcombine-lower-dbg-declare", cl::Hidden, cl::init(true)) ( "instcombine-lower-dbg-declare" , cl::Hidden , cl::init(true) )	static