#include <Instructions.h>

Inheritance diagram for llvm::PHINode:

Collaboration diagram for llvm::PHINode:

Public Types
typedef BasicBlock **	block_iterator

typedef BasicBlock const	const_block_iterator

Public Types inherited from llvm::Instruction
enum	OperationEquivalenceFlags { CompareIgnoringAlignment = 1<<0, CompareUsingScalarTypes = 1<<1 }

enum	TermOps

enum	BinaryOps

enum	MemoryOps

enum	CastOps

enum	OtherOps

Public Types inherited from llvm::User
typedef Use *	op_iterator

typedef const Use *	const_op_iterator

Public Types inherited from llvm::Value
enum	ValueTy { ArgumentVal, BasicBlockVal, FunctionVal, GlobalAliasVal, GlobalVariableVal, UndefValueVal, BlockAddressVal, ConstantExprVal, ConstantAggregateZeroVal, ConstantDataArrayVal, ConstantDataVectorVal, ConstantIntVal, ConstantFPVal, ConstantArrayVal, ConstantStructVal, ConstantVectorVal, ConstantPointerNullVal, MDNodeVal, MDStringVal, InlineAsmVal, PseudoSourceValueVal, FixedStackPseudoSourceValueVal, InstructionVal, ConstantFirstVal = FunctionVal, ConstantLastVal = ConstantPointerNullVal }

typedef value_use_iterator< User >	use_iterator

typedef value_use_iterator < const User >	const_use_iterator

Public Member Functions
	~PHINode ()

	DECLARE_TRANSPARENT_OPERAND_ACCESSORS (Value)
	Provide fast operand accessors. More...

block_iterator	block_begin ()

const_block_iterator	block_begin () const

block_iterator	block_end ()

const_block_iterator	block_end () const

unsigned	getNumIncomingValues () const

Value *	getIncomingValue (unsigned i) const

void	setIncomingValue (unsigned i, Value *V)

BasicBlock *	getIncomingBlock (unsigned i) const

BasicBlock *	getIncomingBlock (const Use &U) const

template<typename U >
BasicBlock *	getIncomingBlock (value_use_iterator< U > I) const

void	setIncomingBlock (unsigned i, BasicBlock *BB)

void	addIncoming (Value V, BasicBlock BB)

Value *	removeIncomingValue (unsigned Idx, bool DeletePHIIfEmpty=true)

Value *	removeIncomingValue (const BasicBlock *BB, bool DeletePHIIfEmpty=true)

int	getBasicBlockIndex (const BasicBlock *BB) const

Value *	getIncomingValueForBlock (const BasicBlock *BB) const

Value *	hasConstantValue () const

Public Member Functions inherited from llvm::Instruction
	~Instruction ()

Instruction *	use_back ()

const Instruction *	use_back () const

const BasicBlock *	getParent () const

BasicBlock *	getParent ()

void	removeFromParent ()

void	eraseFromParent ()

void	insertBefore (Instruction *InsertPos)

void	insertAfter (Instruction *InsertPos)

void	moveBefore (Instruction *MovePos)

unsigned	getOpcode () const
	getOpcode() returns a member of one of the enums like Instruction::Add. More...

const char *	getOpcodeName () const

bool	isTerminator () const

bool	isBinaryOp () const

bool	isShift ()

bool	isCast () const

bool	isLogicalShift () const

bool	isArithmeticShift () const
	isArithmeticShift - Return true if this is an arithmetic shift right. More...

bool	hasMetadata () const

bool	hasMetadataOtherThanDebugLoc () const

MDNode *	getMetadata (unsigned KindID) const

MDNode *	getMetadata (StringRef Kind) const

void	getAllMetadata (SmallVectorImpl< std::pair< unsigned, MDNode * > > &MDs) const

void	getAllMetadataOtherThanDebugLoc (SmallVectorImpl< std::pair< unsigned, MDNode * > > &MDs) const

void	setMetadata (unsigned KindID, MDNode *Node)

void	setMetadata (StringRef Kind, MDNode *Node)

void	setDebugLoc (const DebugLoc &Loc)
	setDebugLoc - Set the debug location information for this instruction. More...

const DebugLoc &	getDebugLoc () const
	getDebugLoc - Return the debug location for this node as a DebugLoc. More...

void	setHasUnsafeAlgebra (bool B)

void	setHasNoNaNs (bool B)

void	setHasNoInfs (bool B)

void	setHasNoSignedZeros (bool B)

void	setHasAllowReciprocal (bool B)

void	setFastMathFlags (FastMathFlags FMF)

bool	hasUnsafeAlgebra () const
	Determine whether the unsafe-algebra flag is set. More...

bool	hasNoNaNs () const
	Determine whether the no-NaNs flag is set. More...

bool	hasNoInfs () const
	Determine whether the no-infs flag is set. More...

bool	hasNoSignedZeros () const
	Determine whether the no-signed-zeros flag is set. More...

bool	hasAllowReciprocal () const
	Determine whether the allow-reciprocal flag is set. More...

FastMathFlags	getFastMathFlags () const

void	copyFastMathFlags (const Instruction *I)
	Copy I's fast-math flags. More...

bool	isAssociative () const

bool	isCommutative () const

bool	isIdempotent () const

bool	isNilpotent () const

bool	mayWriteToMemory () const

bool	mayReadFromMemory () const

bool	mayReadOrWriteMemory () const

bool	mayThrow () const

bool	mayReturn () const

bool	mayHaveSideEffects () const

Instruction *	clone () const

bool	isIdenticalTo (const Instruction *I) const

bool	isIdenticalToWhenDefined (const Instruction *I) const

bool	isSameOperationAs (const Instruction *I, unsigned flags=0) const
	Determine if one instruction is the same operation as another. More...

bool	isUsedOutsideOfBlock (const BasicBlock *BB) const

Public Member Functions inherited from llvm::User
	~User ()

void	operator delete (void *Usr)
	operator delete - free memory allocated for User and Use objects More...

void	operator delete (void *, unsigned)
	placement delete - required by std, but never called. More...

void	operator delete (void *, unsigned, bool)
	placement delete - required by std, but never called. More...

Value *	getOperand (unsigned i) const

void	setOperand (unsigned i, Value *Val)

const Use &	getOperandUse (unsigned i) const

Use &	getOperandUse (unsigned i)

unsigned	getNumOperands () const

op_iterator	op_begin ()

const_op_iterator	op_begin () const

op_iterator	op_end ()

const_op_iterator	op_end () const

value_op_iterator	value_op_begin ()

value_op_iterator	value_op_end ()

void	dropAllReferences ()

void	replaceUsesOfWith (Value From, Value To)

Public Member Functions inherited from llvm::Value
virtual	~Value ()

void	dump () const
	dump - Support for debugging, callable in GDB: V->dump() More...

void	print (raw_ostream &O, AssemblyAnnotationWriter *AAW=0) const

Type *	getType () const

LLVMContext &	getContext () const
	All values hold a context through their type. More...

bool	hasName () const

ValueName *	getValueName () const

void	setValueName (ValueName *VN)

StringRef	getName () const

void	setName (const Twine &Name)

void	takeName (Value *V)

void	replaceAllUsesWith (Value *V)

bool	use_empty () const

use_iterator	use_begin ()

const_use_iterator	use_begin () const

use_iterator	use_end ()

const_use_iterator	use_end () const

User *	use_back ()

const User *	use_back () const

bool	hasOneUse () const

bool	hasNUses (unsigned N) const

bool	hasNUsesOrMore (unsigned N) const

bool	isUsedInBasicBlock (const BasicBlock *BB) const

unsigned	getNumUses () const

void	addUse (Use &U)

unsigned	getValueID () const

unsigned	getRawSubclassOptionalData () const

void	clearSubclassOptionalData ()

bool	hasSameSubclassOptionalData (const Value *V) const

void	intersectOptionalDataWith (const Value *V)

bool	hasValueHandle () const

Value *	stripPointerCasts ()
	Strips off any unneeded pointer casts, all-zero GEPs and aliases from the specified value, returning the original uncasted value. More...

const Value *	stripPointerCasts () const

Value *	stripPointerCastsNoFollowAliases ()
	Strips off any unneeded pointer casts and all-zero GEPs from the specified value, returning the original uncasted value. More...

const Value *	stripPointerCastsNoFollowAliases () const

Value *	stripInBoundsConstantOffsets ()
	Strips off unneeded pointer casts and all-constant GEPs from the specified value, returning the original pointer value. More...

const Value *	stripInBoundsConstantOffsets () const

Value *	stripAndAccumulateInBoundsConstantOffsets (const DataLayout &DL, APInt &Offset)
	Strips like `stripInBoundsConstantOffsets` but also accumulates the constant offset stripped. More...

const Value *	stripAndAccumulateInBoundsConstantOffsets (const DataLayout &DL, APInt &Offset) const

Value *	stripInBoundsOffsets ()
	Strips off unneeded pointer casts and any in-bounds offsets from the specified value, returning the original pointer value. More...

const Value *	stripInBoundsOffsets () const

bool	isDereferenceablePointer () const

Value *	DoPHITranslation (const BasicBlock CurBB, const BasicBlock PredBB)

const Value *	DoPHITranslation (const BasicBlock CurBB, const BasicBlock PredBB) const

void	mutateType (Type *Ty)

Public Member Functions inherited from llvm::ilist_node< Instruction >
Instruction *	getPrevNode ()
	Get the previous node, or 0 for the list head. More...

const Instruction *	getPrevNode () const
	Get the previous node, or 0 for the list head. More...

Instruction *	getNextNode ()
	Get the next node, or 0 for the list tail. More...

const Instruction *	getNextNode () const
	Get the next node, or 0 for the list tail. More...

Static Public Member Functions
static PHINode *	Create (Type Ty, unsigned NumReservedValues, const Twine &NameStr="", Instruction InsertBefore=0)

static PHINode *	Create (Type Ty, unsigned NumReservedValues, const Twine &NameStr, BasicBlock InsertAtEnd)

static unsigned	getOperandNumForIncomingValue (unsigned i)

static unsigned	getIncomingValueNumForOperand (unsigned i)

static bool	classof (const Instruction *I)
	Methods for support type inquiry through isa, cast, and dyn_cast: More...

static bool	classof (const Value *V)

Static Public Member Functions inherited from llvm::Instruction
static const char *	getOpcodeName (unsigned OpCode)

static bool	isTerminator (unsigned OpCode)

static bool	isBinaryOp (unsigned Opcode)

static bool	isShift (unsigned Opcode)
	Determine if the Opcode is one of the shift instructions. More...

static bool	isCast (unsigned OpCode)
	Determine if the OpCode is one of the CastInst instructions. More...

static bool	isAssociative (unsigned op)

static bool	isCommutative (unsigned op)

static bool	isIdempotent (unsigned op)

static bool	isNilpotent (unsigned op)

static bool	classof (const Value *V)
	Methods for support type inquiry through isa, cast, and dyn_cast: More...

Static Public Member Functions inherited from llvm::User
static bool	classof (const Value *V)

Protected Member Functions
Use *	allocHungoffUses (unsigned) const

virtual PHINode *	clone_impl () const

Protected Member Functions inherited from llvm::Instruction
void	setInstructionSubclassData (unsigned short D)

unsigned	getSubclassDataFromInstruction () const

	Instruction (Type Ty, unsigned iType, Use Ops, unsigned NumOps, Instruction *InsertBefore=0)

	Instruction (Type Ty, unsigned iType, Use Ops, unsigned NumOps, BasicBlock *InsertAtEnd)

Protected Member Functions inherited from llvm::User
void *	operator new (size_t s, unsigned Us)

	User (Type ty, unsigned vty, Use OpList, unsigned NumOps)

Use *	allocHungoffUses (unsigned) const

void	dropHungoffUses ()

template<int Idx>
Use &	Op ()

template<int Idx>
const Use &	Op () const

Protected Member Functions inherited from llvm::Value
virtual void	printCustom (raw_ostream &O) const

	Value (Type *Ty, unsigned scid)

unsigned short	getSubclassDataFromValue () const

void	setValueSubclassData (unsigned short D)

Protected Member Functions inherited from llvm::ilist_node< Instruction >
	ilist_node ()

Additional Inherited Members
Static Public Attributes inherited from llvm::Value
static const unsigned	MaximumAlignment = 1u << 29

Static Protected Member Functions inherited from llvm::User
template<int Idx, typename U >
static Use &	OpFrom (const U *that)

Protected Attributes inherited from llvm::User
Use *	OperandList

unsigned	NumOperands

Protected Attributes inherited from llvm::Value
unsigned char	SubclassOptionalData: 7

Detailed Description

Definition at line 1978 of file Instructions.h.

Member Typedef Documentation

typedef BasicBlock** llvm::PHINode::block_iterator

Definition at line 2030 of file Instructions.h.

typedef BasicBlock* const* llvm::PHINode::const_block_iterator

Definition at line 2031 of file Instructions.h.

Constructor & Destructor Documentation

PHINode::~PHINode ( )

Definition at line 96 of file Instructions.cpp.

References llvm::User::dropHungoffUses().

Member Function Documentation

void llvm::PHINode::addIncoming	(	Value *	V,
		BasicBlock *	BB
	)

inline

addIncoming - Add an incoming value to the end of the PHI list

Definition at line 2100 of file Instructions.h.

References llvm::Intrinsic::getType(), and llvm::Value::getType().

Referenced by AddPHINodeEntriesForMappedBlock(), llvm::SSAUpdaterTraits< SSAUpdater >::AddPHIOperand(), AddPredecessorToBlock(), ConnectProlog(), convertMemSetToLoop(), convertTransferToLoop(), createPHIsForSplitLoopExit(), generateUnsignedDivisionCode(), llvm::SSAUpdater::GetValueInMiddleOfBlock(), llvm::InlineFunction(), insertFastDiv(), LLVMAddIncoming(), mergeEmptyReturnBlocks(), PerformHeapAllocSRoA(), redirectValuesFromPredecessorsToPhi(), SimplifyBranchOnICmpChain(), SimplifyCondBranchToCondBranch(), SinkThenElseCodeToEnd(), llvm::InstCombiner::SliceUpIllegalIntegerPHI(), speculatePHINodeLoads(), llvm::SplitLandingPadPredecessors(), tryToMakeAllocaBePromotable(), TryToSimplifyUncondBranchWithICmpInIt(), llvm::UnrollLoop(), UpdatePHINodes(), and llvm::ObjectSizeOffsetEvaluator::visitPHINode().

Use * PHINode::allocHungoffUses ( unsigned N ) const

protected

Definition at line 100 of file Instructions.cpp.

References llvm::Use::initTags(), and N.

block_iterator llvm::PHINode::block_begin ( )

inline

Definition at line 2033 of file Instructions.h.

Referenced by llvm::EliminateDuplicatePHINodes(), and removeIncomingValue().

const_block_iterator llvm::PHINode::block_begin ( ) const

inline

Definition at line 2039 of file Instructions.h.

block_iterator llvm::PHINode::block_end ( )

inline

Definition at line 2045 of file Instructions.h.

Referenced by llvm::EliminateDuplicatePHINodes(), and removeIncomingValue().

const_block_iterator llvm::PHINode::block_end ( ) const

inline

Definition at line 2049 of file Instructions.h.

static bool llvm::PHINode::classof ( const Instruction * I )

inlinestatic

Methods for support type inquiry through isa, cast, and dyn_cast:

Definition at line 2150 of file Instructions.h.

References llvm::Instruction::getOpcode(), and llvm::TargetOpcode::PHI.

static bool llvm::PHINode::classof ( const Value * V )

inlinestatic

Definition at line 2153 of file Instructions.h.

PHINode * PHINode::clone_impl ( ) const

protectedvirtual

Implements llvm::Instruction.

Definition at line 3648 of file Instructions.cpp.

static PHINode* llvm::PHINode::Create	(	Type *	Ty,
		unsigned	NumReservedValues,
		const Twine &	NameStr = `""`,
		Instruction *	InsertBefore = `0`
	)

inlinestatic

Constructors - NumReservedValues is a hint for the number of incoming edges that this phi node will have (use 0 if you really have no idea).

Definition at line 2013 of file Instructions.h.

Referenced by ConnectProlog(), llvm::SSAUpdaterTraits< SSAUpdater >::CreateEmptyPHI(), llvm::IRBuilder< true, TargetFolder >::CreatePHI(), createPHIsForSplitLoopExit(), GetHeapSROAValue(), llvm::SSAUpdater::GetValueInMiddleOfBlock(), llvm::InlineFunction(), mergeEmptyReturnBlocks(), llvm::UnifyFunctionExitNodes::runOnFunction(), SimplifyCondBranchToCondBranch(), SinkThenElseCodeToEnd(), llvm::InstCombiner::SliceUpIllegalIntegerPHI(), llvm::SplitLandingPadPredecessors(), tryToMakeAllocaBePromotable(), and UpdatePHINodes().

static PHINode* llvm::PHINode::Create	(	Type *	Ty,
		unsigned	NumReservedValues,
		const Twine &	NameStr,
		BasicBlock *	InsertAtEnd
	)

inlinestatic

Definition at line 2018 of file Instructions.h.

llvm::PHINode::DECLARE_TRANSPARENT_OPERAND_ACCESSORS ( Value )

Provide fast operand accessors.

int llvm::PHINode::getBasicBlockIndex ( const BasicBlock * BB ) const

inline

getBasicBlockIndex - Return the first index of the specified basic block in the value list for this PHI. Returns -1 if no instance.

Definition at line 2132 of file Instructions.h.

Referenced by AlmostDeadIV(), CloneLoopBlocks(), ConnectProlog(), createPHIsForSplitLoopExit(), FindLoopCounter(), needsLFTR(), llvm::BasicBlock::replaceSuccessorsPhiUsesWith(), RewriteUsesOfClonedInstructions(), SpeculativelyExecuteBB(), llvm::BasicBlock::splitBasicBlock(), llvm::SplitCriticalEdge(), UpdatePHINodes(), and llvm::InstCombiner::visitPHINode().

BasicBlock* llvm::PHINode::getIncomingBlock ( unsigned i ) const

inline

getIncomingBlock - Return incoming basic block number i.

Definition at line 2074 of file Instructions.h.

Referenced by CanPropagatePredecessorsForPHIs(), llvm::CloneAndPruneFunctionInto(), llvm::DemotePHIToStack(), llvm::InstCombiner::DoOneIteration(), llvm::CodeExtractor::extractCodeRegion(), FindPhiPredForUseInBlock(), FindPHIToPartitionLoops(), FoldCondBranchOnPHI(), FoldTwoEntryPHINode(), gatherIncomingValuesToPhi(), llvm::GetIfCondition(), getInsertPointForUses(), HoistThenElseCodeToIf(), IsEquivalentPHI(), llvm::Instruction::isIdenticalToWhenDefined(), isSafePHIToSpeculate(), llvm::Instruction::isUsedOutsideOfBlock(), IVUseShouldUsePostIncValue(), OptimizeNoopCopyExpression(), PerformHeapAllocSRoA(), redirectValuesFromPredecessorsToPhi(), llvm::BasicBlock::removePredecessor(), removeUndefIntroducingPredecessor(), replaceUndefValuesInPhi(), llvm::InstCombiner::SliceUpIllegalIntegerPHI(), speculatePHINodeLoads(), llvm::SplitCriticalEdge(), SplitCriticalSideEffectEdges(), tryToMakeAllocaBePromotable(), llvm::InstCombiner::visitPHINode(), llvm::ObjectSizeOffsetEvaluator::visitPHINode(), and WriteInstruction().

BasicBlock* llvm::PHINode::getIncomingBlock ( const Use & U ) const

inline

getIncomingBlock - Return incoming basic block corresponding to an operand of the PHI.

Definition at line 2081 of file Instructions.h.

References llvm::Use::getUser().

template<typename U >

BasicBlock* llvm::PHINode::getIncomingBlock ( value_use_iterator< U > I ) const

inline

getIncomingBlock - Return incoming basic block corresponding to value use iterator.

Definition at line 2090 of file Instructions.h.

References llvm::value_use_iterator< UserTy >::getUse().

Value* llvm::PHINode::getIncomingValue ( unsigned i ) const

inline

getIncomingValue - Return incoming value number x

Definition at line 2059 of file Instructions.h.

Referenced by AllGlobalLoadUsesSimpleEnoughForHeapSRA(), AlmostDeadIV(), CanEvaluateSExtd(), CanEvaluateShifted(), CanEvaluateTruncated(), CanEvaluateZExtd(), CanPropagatePredecessorsForPHIs(), llvm::CloneAndPruneFunctionInto(), CloneLoopBlocks(), llvm::ComputeMaskedBits(), llvm::ComputeNumSignBits(), llvm::FunctionLoweringInfo::ComputePHILiveOutRegInfo(), createPHIsForSplitLoopExit(), llvm::DemotePHIToStack(), FindLoopCounter(), FindPHIToPartitionLoops(), FoldCondBranchOnPHI(), FoldTwoEntryPHINode(), gatherIncomingValuesToPhi(), getInsertPointForUses(), GetShiftedValue(), hasConstantValue(), IsEquivalentPHI(), isSafePHIToSpeculate(), IVUseShouldUsePostIncValue(), needsLFTR(), PerformHeapAllocSRoA(), PHIsEqualValue(), redirectValuesFromPredecessorsToPhi(), removeIncomingValue(), removeUndefIntroducingPredecessor(), replaceUndefValuesInPhi(), SimplifyPHINode(), llvm::InstCombiner::SliceUpIllegalIntegerPHI(), speculatePHINodeLoads(), SpeculativelyExecuteBB(), SplitCriticalSideEffectEdges(), ThreadBinOpOverPHI(), ThreadCmpOverPHI(), tryToMakeAllocaBePromotable(), llvm::InstCombiner::visitPHINode(), llvm::ObjectSizeOffsetEvaluator::visitPHINode(), and WriteInstruction().

Value* llvm::PHINode::getIncomingValueForBlock ( const BasicBlock * BB ) const

inline

static unsigned llvm::PHINode::getIncomingValueNumForOperand ( unsigned i )

inlinestatic

Definition at line 2068 of file Instructions.h.

Referenced by llvm::IVUsers::AddUsersImpl().

unsigned llvm::PHINode::getNumIncomingValues ( ) const

inline

getNumIncomingValues - Return the number of incoming edges

Definition at line 2055 of file Instructions.h.

Referenced by AllGlobalLoadUsesSimpleEnoughForHeapSRA(), CanEvaluateSExtd(), CanEvaluateShifted(), CanEvaluateTruncated(), CanEvaluateZExtd(), CanPropagatePredecessorsForPHIs(), llvm::CloneAndPruneFunctionInto(), llvm::ComputeMaskedBits(), llvm::ComputeNumSignBits(), llvm::FunctionLoweringInfo::ComputePHILiveOutRegInfo(), ConstructSSAForLoadSet(), llvm::DemotePHIToStack(), llvm::CodeExtractor::extractCodeRegion(), FindPHIToPartitionLoops(), FoldCondBranchOnPHI(), gatherIncomingValuesToPhi(), llvm::GetIfCondition(), getInsertPointForUses(), GetShiftedValue(), hasConstantValue(), HoistThenElseCodeToIf(), IsEquivalentPHI(), isSafePHIToSpeculate(), IVUseShouldUsePostIncValue(), PerformHeapAllocSRoA(), PHIsEqualValue(), redirectValuesFromPredecessorsToPhi(), llvm::BasicBlock::removePredecessor(), removeUndefIntroducingPredecessor(), replaceUndefValuesInPhi(), SimplifyPHINode(), llvm::InstCombiner::SliceUpIllegalIntegerPHI(), speculatePHINodeLoads(), SplitCriticalSideEffectEdges(), ThreadBinOpOverPHI(), ThreadCmpOverPHI(), tryToMakeAllocaBePromotable(), llvm::SSAUpdaterTraits< SSAUpdater >::ValueIsNewPHI(), llvm::InstCombiner::visitPHINode(), llvm::ObjectSizeOffsetEvaluator::visitPHINode(), and WriteInstruction().

static unsigned llvm::PHINode::getOperandNumForIncomingValue ( unsigned i )

inlinestatic

Definition at line 2065 of file Instructions.h.

Referenced by ConstructSSAForLoadSet().

Value * PHINode::hasConstantValue ( ) const

hasConstantValue - If the specified PHI node always merges together the same value, return the value, otherwise return null.

Definition at line 161 of file Instructions.cpp.

References llvm::UndefValue::get(), getIncomingValue(), getNumIncomingValues(), and llvm::Value::getType().

Referenced by llvm::ComputeMaskedBits(), llvm::BasicBlock::removePredecessor(), llvm::SCEVExpander::replaceCongruentIVs(), and llvm::ObjectSizeOffsetEvaluator::visitPHINode().

Value * PHINode::removeIncomingValue	(	unsigned	Idx,
		bool	DeletePHIIfEmpty = `true`
	)

removeIncomingValue - Remove an incoming value. This is useful if a predecessor basic block is deleted. The value removed is returned.

If the last incoming value for a PHI node is removed (and DeletePHIIfEmpty is true), the PHI node is destroyed and any uses of it are replaced with dummy values. The only time there should be zero incoming values to a PHI node is when the block is dead, so this strategy is sound.

Definition at line 114 of file Instructions.cpp.

References block_begin(), block_end(), llvm::Instruction::eraseFromParent(), llvm::UndefValue::get(), getIncomingValue(), llvm::User::getNumOperands(), llvm::Value::getType(), llvm::User::NumOperands, llvm::User::Op(), llvm::User::op_begin(), llvm::User::op_end(), and llvm::Value::replaceAllUsesWith().