This class represents a truncation of integer types. More...

#include "llvm/IR/Instructions.h"

Inheritance diagram for llvm::TruncInst:

[legend]

Public Types
enum	{ AnyWrap = 0 , NoUnsignedWrap = (1 << 0) , NoSignedWrap = (1 << 1) }

Public Types inherited from llvm::Instruction
enum	OperationEquivalenceFlags { CompareIgnoringAlignment = 1 << 0 , CompareUsingScalarTypes = 1 << 1 , CompareUsingIntersectedAttrs = 1 << 2 }
	When checking for operation equivalence (using isSameOperationAs) it is sometimes useful to ignore certain attributes. More...

enum	TermOps

enum	UnaryOps

enum	BinaryOps

enum	MemoryOps

enum	CastOps

enum	FuncletPadOps

enum	OtherOps

using	InstListType = SymbolTableList< Instruction, ilist_iterator_bits< true >, ilist_parent< BasicBlock > >

Public Types inherited from llvm::User
using	op_iterator = Use *

using	const_op_iterator = const Use *

using	op_range = iterator_range< op_iterator >

using	const_op_range = iterator_range< const_op_iterator >

Public Types inherited from llvm::Value
enum	ValueTy
	Concrete subclass of this. More...

using	use_iterator = use_iterator_impl< Use >

using	const_use_iterator = use_iterator_impl< const Use >

using	user_iterator = user_iterator_impl< User >

using	const_user_iterator = user_iterator_impl< const User >

Public Member Functions
	TruncInst (Value S, Type Ty, const Twine &NameStr="", InsertPosition InsertBefore=nullptr)
	Constructor with insert-before-instruction semantics.

void	setHasNoUnsignedWrap (bool B)

void	setHasNoSignedWrap (bool B)

bool	hasNoUnsignedWrap () const
	Test whether this operation is known to never undergo unsigned overflow, aka the nuw property.

bool	hasNoSignedWrap () const
	Test whether this operation is known to never undergo signed overflow, aka the nsw property.

unsigned	getNoWrapKind () const
	Returns the no-wrap kind of the operation.

Public Member Functions inherited from llvm::CastInst
bool	isIntegerCast () const
	There are several places where we need to know if a cast instruction only deals with integer source and destination types.

bool	isNoopCast (const DataLayout &DL) const
	Determine if this cast is a no-op cast.

Instruction::CastOps	getOpcode () const
	Return the opcode of this CastInst.

Type *	getSrcTy () const
	Return the source type, as a convenience.

Type *	getDestTy () const
	Return the destination type, as a convenience.

Public Member Functions inherited from llvm::UnaryInstruction
void *	operator new (size_t S)

void	operator delete (void *Ptr)

	DECLARE_TRANSPARENT_OPERAND_ACCESSORS (Value)
	Transparently provide more efficient getOperand methods.

Public Member Functions inherited from llvm::Instruction
iterator_range< simple_ilist< DbgRecord >::iterator >	cloneDebugInfoFrom (const Instruction *From, std::optional< simple_ilist< DbgRecord >::iterator > FromHere=std::nullopt, bool InsertAtHead=false)
	Clone any debug-info attached to `From` onto this instruction.

iterator_range< simple_ilist< DbgRecord >::iterator >	getDbgRecordRange () const
	Return a range over the DbgRecords attached to this instruction.

std::optional< simple_ilist< DbgRecord >::iterator >	getDbgReinsertionPosition ()
	Return an iterator to the position of the "Next" DbgRecord after this instruction, or std::nullopt.

bool	hasDbgRecords () const
	Returns true if any DbgRecords are attached to this instruction.

void	adoptDbgRecords (BasicBlock *BB, InstListType::iterator It, bool InsertAtHead)
	Transfer any DbgRecords on the position `It` onto this instruction, by simply adopting the sequence of DbgRecords (which is efficient) if possible, by merging two sequences otherwise.

void	dropDbgRecords ()
	Erase any DbgRecords attached to this instruction.

void	dropOneDbgRecord (DbgRecord *I)
	Erase a single DbgRecord `I` that is attached to this instruction.

void	handleMarkerRemoval ()
	Handle the debug-info implications of this instruction being removed.

	Instruction (const Instruction &)=delete

Instruction &	operator= (const Instruction &)=delete

Instruction *	user_back ()
	Specialize the methods defined in Value, as we know that an instruction can only be used by other instructions.

const Instruction *	user_back () const

const Module *	getModule () const
	Return the module owning the function this instruction belongs to or nullptr it the function does not have a module.

Module *	getModule ()

const Function *	getFunction () const
	Return the function this instruction belongs to.

Function *	getFunction ()

const DataLayout &	getDataLayout () const
	Get the data layout of the module this instruction belongs to.

void	removeFromParent ()
	This method unlinks 'this' from the containing basic block, but does not delete it.

InstListType::iterator	eraseFromParent ()
	This method unlinks 'this' from the containing basic block and deletes it.

void	insertBefore (Instruction *InsertPos)
	Insert an unlinked instruction into a basic block immediately before the specified instruction.

void	insertBefore (InstListType::iterator InsertPos)
	Insert an unlinked instruction into a basic block immediately before the specified instruction.

void	insertAfter (Instruction *InsertPos)
	Insert an unlinked instruction into a basic block immediately after the specified instruction.

InstListType::iterator	insertInto (BasicBlock *ParentBB, InstListType::iterator It)
	Inserts an unlinked instruction into `ParentBB` at position `It` and returns the iterator of the inserted instruction.

void	insertBefore (BasicBlock &BB, InstListType::iterator InsertPos)

void	moveBefore (Instruction *MovePos)
	Unlink this instruction from its current basic block and insert it into the basic block that MovePos lives in, right before MovePos.

void	moveBeforePreserving (Instruction *MovePos)
	Perform a moveBefore operation, while signalling that the caller intends to preserve the original ordering of instructions.

void	moveBefore (BasicBlock &BB, InstListType::iterator I)
	Unlink this instruction and insert into BB before I.

void	moveBeforePreserving (BasicBlock &BB, InstListType::iterator I)
	(See other overload for moveBeforePreserving).

void	moveAfter (Instruction *MovePos)
	Unlink this instruction from its current basic block and insert it into the basic block that MovePos lives in, right after MovePos.

void	moveAfterPreserving (Instruction *MovePos)
	See moveBeforePreserving .

bool	comesBefore (const Instruction *Other) const
	Given an instruction Other in the same basic block as this instruction, return true if this instruction comes before Other.

std::optional< InstListType::iterator >	getInsertionPointAfterDef ()
	Get the first insertion point at which the result of this instruction is defined.

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

const char *	getOpcodeName () const

bool	isTerminator () const

bool	isUnaryOp () const

bool	isBinaryOp () const

bool	isIntDivRem () const

bool	isFPDivRem () const

bool	isShift () const

bool	isCast () const

bool	isFuncletPad () const

bool	isSpecialTerminator () const

bool	isOnlyUserOfAnyOperand ()
	It checks if this instruction is the only user of at least one of its operands.

bool	isLogicalShift () const
	Return true if this is a logical shift left or a logical shift right.

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

bool	isBitwiseLogicOp () const
	Return true if this is and/or/xor.

bool	hasMetadata () const
	Return true if this instruction has any metadata attached to it.

bool	hasMetadataOtherThanDebugLoc () const
	Return true if this instruction has metadata attached to it other than a debug location.

bool	hasMetadata (unsigned KindID) const
	Return true if this instruction has the given type of metadata attached.

bool	hasMetadata (StringRef Kind) const
	Return true if this instruction has the given type of metadata attached.

MDNode *	getMetadata (unsigned KindID) const
	Get the metadata of given kind attached to this Instruction.

MDNode *	getMetadata (StringRef Kind) const
	Get the metadata of given kind attached to this Instruction.

void	getAllMetadata (SmallVectorImpl< std::pair< unsigned, MDNode * > > &MDs) const
	Get all metadata attached to this Instruction.

void	getAllMetadataOtherThanDebugLoc (SmallVectorImpl< std::pair< unsigned, MDNode * > > &MDs) const
	This does the same thing as getAllMetadata, except that it filters out the debug location.

void	setMetadata (unsigned KindID, MDNode *Node)
	Set the metadata of the specified kind to the specified node.

void	setMetadata (StringRef Kind, MDNode *Node)

void	copyMetadata (const Instruction &SrcInst, ArrayRef< unsigned > WL=ArrayRef< unsigned >())
	Copy metadata from `SrcInst` to this instruction.

void	eraseMetadataIf (function_ref< bool(unsigned, MDNode *)> Pred)
	Erase all metadata that matches the predicate.

void	swapProfMetadata ()
	If the instruction has "branch_weights" MD_prof metadata and the MDNode has three operands (including name string), swap the order of the metadata.

void	addAnnotationMetadata (StringRef Annotation)
	Adds an !annotation metadata node with `Annotation` to this instruction.

void	addAnnotationMetadata (SmallVector< StringRef > Annotations)
	Adds an !annotation metadata node with an array of `Annotations` as a tuple to this instruction.

AAMDNodes	getAAMetadata () const
	Returns the AA metadata for this instruction.

void	setAAMetadata (const AAMDNodes &N)
	Sets the AA metadata on this instruction from the AAMDNodes structure.

void	setNoSanitizeMetadata ()
	Sets the nosanitize metadata on this instruction.

bool	extractProfTotalWeight (uint64_t &TotalVal) const
	Retrieve total raw weight values of a branch.

void	setDebugLoc (DebugLoc Loc)
	Set the debug location information for this instruction.

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

const DebugLoc &	getStableDebugLoc () const
	Fetch the debug location for this node, unless this is a debug intrinsic, in which case fetch the debug location of the next non-debug node.

void	setHasNoUnsignedWrap (bool b=true)
	Set or clear the nuw flag on this instruction, which must be an operator which supports this flag.

void	setHasNoSignedWrap (bool b=true)
	Set or clear the nsw flag on this instruction, which must be an operator which supports this flag.

void	setIsExact (bool b=true)
	Set or clear the exact flag on this instruction, which must be an operator which supports this flag.

void	setNonNeg (bool b=true)
	Set or clear the nneg flag on this instruction, which must be a zext instruction.

bool	hasNoUnsignedWrap () const LLVM_READONLY
	Determine whether the no unsigned wrap flag is set.

bool	hasNoSignedWrap () const LLVM_READONLY
	Determine whether the no signed wrap flag is set.

bool	hasNonNeg () const LLVM_READONLY
	Determine whether the the nneg flag is set.

bool	hasPoisonGeneratingFlags () const LLVM_READONLY
	Return true if this operator has flags which may cause this instruction to evaluate to poison despite having non-poison inputs.

void	dropPoisonGeneratingFlags ()
	Drops flags that may cause this instruction to evaluate to poison despite having non-poison inputs.

bool	hasPoisonGeneratingMetadata () const LLVM_READONLY
	Return true if this instruction has poison-generating metadata.

void	dropPoisonGeneratingMetadata ()
	Drops metadata that may generate poison.

bool	hasPoisonGeneratingReturnAttributes () const LLVM_READONLY
	Return true if this instruction has poison-generating attribute.

void	dropPoisonGeneratingReturnAttributes ()
	Drops return attributes that may generate poison.

bool	hasPoisonGeneratingAnnotations () const
	Return true if this instruction has poison-generating flags, return attributes or metadata.

void	dropPoisonGeneratingAnnotations ()
	Drops flags, return attributes and metadata that may generate poison.

void	dropUBImplyingAttrsAndUnknownMetadata (ArrayRef< unsigned > KnownIDs={})
	This function drops non-debug unknown metadata (through dropUnknownNonDebugMetadata).

void	dropUBImplyingAttrsAndMetadata ()
	Drop any attributes or metadata that can cause immediate undefined behavior.

bool	isExact () const LLVM_READONLY
	Determine whether the exact flag is set.

void	setFast (bool B)
	Set or clear all fast-math-flags on this instruction, which must be an operator which supports this flag.

void	setHasAllowReassoc (bool B)
	Set or clear the reassociation flag on this instruction, which must be an operator which supports this flag.

void	setHasNoNaNs (bool B)
	Set or clear the no-nans flag on this instruction, which must be an operator which supports this flag.

void	setHasNoInfs (bool B)
	Set or clear the no-infs flag on this instruction, which must be an operator which supports this flag.

void	setHasNoSignedZeros (bool B)
	Set or clear the no-signed-zeros flag on this instruction, which must be an operator which supports this flag.

void	setHasAllowReciprocal (bool B)
	Set or clear the allow-reciprocal flag on this instruction, which must be an operator which supports this flag.

void	setHasAllowContract (bool B)
	Set or clear the allow-contract flag on this instruction, which must be an operator which supports this flag.

void	setHasApproxFunc (bool B)
	Set or clear the approximate-math-functions flag on this instruction, which must be an operator which supports this flag.

void	setFastMathFlags (FastMathFlags FMF)
	Convenience function for setting multiple fast-math flags on this instruction, which must be an operator which supports these flags.

void	copyFastMathFlags (FastMathFlags FMF)
	Convenience function for transferring all fast-math flag values to this instruction, which must be an operator which supports these flags.

bool	isFast () const LLVM_READONLY
	Determine whether all fast-math-flags are set.

bool	hasAllowReassoc () const LLVM_READONLY
	Determine whether the allow-reassociation flag is set.

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

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

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

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

bool	hasAllowContract () const LLVM_READONLY
	Determine whether the allow-contract flag is set.

bool	hasApproxFunc () const LLVM_READONLY
	Determine whether the approximate-math-functions flag is set.

FastMathFlags	getFastMathFlags () const LLVM_READONLY
	Convenience function for getting all the fast-math flags, which must be an operator which supports these flags.

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

void	copyIRFlags (const Value *V, bool IncludeWrapFlags=true)
	Convenience method to copy supported exact, fast-math, and (optionally) wrapping flags from V to this instruction.

void	andIRFlags (const Value *V)
	Logical 'and' of any supported wrapping, exact, and fast-math flags of V and this instruction.

void	applyMergedLocation (DILocation LocA, DILocation LocB)
	Merge 2 debug locations and apply it to the Instruction.

void	updateLocationAfterHoist ()
	Updates the debug location given that the instruction has been hoisted from a block to a predecessor of that block.

void	dropLocation ()
	Drop the instruction's debug location.

void	mergeDIAssignID (ArrayRef< const Instruction * > SourceInstructions)
	Merge the DIAssignID metadata from this instruction and those attached to instructions in `SourceInstructions`.

bool	isAssociative () const LLVM_READONLY
	Return true if the instruction is associative:

bool	isCommutative () const LLVM_READONLY
	Return true if the instruction is commutative:

bool	isIdempotent () const
	Return true if the instruction is idempotent:

bool	isNilpotent () const
	Return true if the instruction is nilpotent:

bool	mayWriteToMemory () const LLVM_READONLY
	Return true if this instruction may modify memory.

bool	mayReadFromMemory () const LLVM_READONLY
	Return true if this instruction may read memory.

bool	mayReadOrWriteMemory () const
	Return true if this instruction may read or write memory.

bool	isAtomic () const LLVM_READONLY
	Return true if this instruction has an AtomicOrdering of unordered or higher.

bool	hasAtomicLoad () const LLVM_READONLY
	Return true if this atomic instruction loads from memory.

bool	hasAtomicStore () const LLVM_READONLY
	Return true if this atomic instruction stores to memory.

bool	isVolatile () const LLVM_READONLY
	Return true if this instruction has a volatile memory access.

Type *	getAccessType () const LLVM_READONLY
	Return the type this instruction accesses in memory, if any.

bool	mayThrow (bool IncludePhaseOneUnwind=false) const LLVM_READONLY
	Return true if this instruction may throw an exception.

bool	isFenceLike () const
	Return true if this instruction behaves like a memory fence: it can load or store to memory location without being given a memory location.

bool	mayHaveSideEffects () const LLVM_READONLY
	Return true if the instruction may have side effects.

bool	isSafeToRemove () const LLVM_READONLY
	Return true if the instruction can be removed if the result is unused.

bool	willReturn () const LLVM_READONLY
	Return true if the instruction will return (unwinding is considered as a form of returning control flow here).

bool	isEHPad () const
	Return true if the instruction is a variety of EH-block.

bool	isLifetimeStartOrEnd () const LLVM_READONLY
	Return true if the instruction is a llvm.lifetime.start or llvm.lifetime.end marker.

bool	isLaunderOrStripInvariantGroup () const LLVM_READONLY
	Return true if the instruction is a llvm.launder.invariant.group or llvm.strip.invariant.group.

bool	isDebugOrPseudoInst () const LLVM_READONLY
	Return true if the instruction is a DbgInfoIntrinsic or PseudoProbeInst.

const Instruction *	getNextNonDebugInstruction (bool SkipPseudoOp=false) const
	Return a pointer to the next non-debug instruction in the same basic block as 'this', or nullptr if no such instruction exists.

Instruction *	getNextNonDebugInstruction (bool SkipPseudoOp=false)

const Instruction *	getPrevNonDebugInstruction (bool SkipPseudoOp=false) const
	Return a pointer to the previous non-debug instruction in the same basic block as 'this', or nullptr if no such instruction exists.

Instruction *	getPrevNonDebugInstruction (bool SkipPseudoOp=false)

Instruction *	clone () const
	Create a copy of 'this' instruction that is identical in all ways except the following:

bool	isIdenticalTo (const Instruction *I) const LLVM_READONLY
	Return true if the specified instruction is exactly identical to the current one.

bool	isIdenticalToWhenDefined (const Instruction *I, bool IntersectAttrs=false) const LLVM_READONLY
	This is like isIdenticalTo, except that it ignores the SubclassOptionalData flags, which may specify conditions under which the instruction's result is undefined.

bool	isSameOperationAs (const Instruction *I, unsigned flags=0) const LLVM_READONLY
	This function determines if the specified instruction executes the same operation as the current one.

bool	hasSameSpecialState (const Instruction *I2, bool IgnoreAlignment=false, bool IntersectAttrs=false) const LLVM_READONLY
	This function determines if the speficied instruction has the same "special" characteristics as the current one.

bool	isUsedOutsideOfBlock (const BasicBlock *BB) const LLVM_READONLY
	Return true if there are any uses of this instruction in blocks other than the specified block.

unsigned	getNumSuccessors () const LLVM_READONLY
	Return the number of successors that this instruction has.

BasicBlock *	getSuccessor (unsigned Idx) const LLVM_READONLY
	Return the specified successor. This instruction must be a terminator.

void	setSuccessor (unsigned Idx, BasicBlock *BB)
	Update the specified successor to point at the provided block.

void	replaceSuccessorWith (BasicBlock OldBB, BasicBlock NewBB)
	Replace specified successor OldBB to point at the provided block.

void	dropUnknownNonDebugMetadata (ArrayRef< unsigned > KnownIDs={})
	Drop all unknown metadata except for debug locations.

Public Member Functions inherited from llvm::User
	User (const User &)=delete

void	operator delete (void *Usr)
	Free memory allocated for User and Use objects.

void	operator delete (void *Usr, HungOffOperandsAllocMarker)
	Placement delete - required by std, called if the ctor throws.

void	operator delete (void *Usr, IntrusiveOperandsAllocMarker)
	Placement delete - required by std, called if the ctor throws.

void	operator delete (void *Usr, IntrusiveOperandsAndDescriptorAllocMarker)
	Placement delete - required by std, called if the ctor throws.

const Use *	getOperandList () const

Use *	getOperandList ()

Value *	getOperand (unsigned i) const

void	setOperand (unsigned i, Value *Val)

const Use &	getOperandUse (unsigned i) const

Use &	getOperandUse (unsigned i)

unsigned	getNumOperands () const

ArrayRef< const uint8_t >	getDescriptor () const
	Returns the descriptor co-allocated with this User instance.

MutableArrayRef< uint8_t >	getDescriptor ()
	Returns the descriptor co-allocated with this User instance.

void	setNumHungOffUseOperands (unsigned NumOps)
	Subclasses with hung off uses need to manage the operand count themselves.

bool	isDroppable () const
	A droppable user is a user for which uses can be dropped without affecting correctness and should be dropped rather than preventing a transformation from happening.

op_iterator	op_begin ()

const_op_iterator	op_begin () const

op_iterator	op_end ()

const_op_iterator	op_end () const

op_range	operands ()

const_op_range	operands () const

value_op_iterator	value_op_begin ()

value_op_iterator	value_op_end ()

iterator_range< value_op_iterator >	operand_values ()

const_value_op_iterator	value_op_begin () const

const_value_op_iterator	value_op_end () const

iterator_range< const_value_op_iterator >	operand_values () const

void	dropAllReferences ()
	Drop all references to operands.

bool	replaceUsesOfWith (Value From, Value To)
	Replace uses of one Value with another.

Public Member Functions inherited from llvm::Value
	Value (const Value &)=delete

Value &	operator= (const Value &)=delete

void	deleteValue ()
	Delete a pointer to a generic Value.

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

Type *	getType () const
	All values are typed, get the type of this value.

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

bool	hasName () const

ValueName *	getValueName () const

void	setValueName (ValueName *VN)

StringRef	getName () const
	Return a constant reference to the value's name.

void	setName (const Twine &Name)
	Change the name of the value.

void	takeName (Value *V)
	Transfer the name from V to this value.

std::string	getNameOrAsOperand () const

void	replaceAllUsesWith (Value *V)
	Change all uses of this to point to a new Value.

void	replaceNonMetadataUsesWith (Value *V)
	Change non-metadata uses of this to point to a new Value.

void	replaceUsesWithIf (Value *New, llvm::function_ref< bool(Use &U)> ShouldReplace)
	Go through the uses list for this definition and make each use point to "V" if the callback ShouldReplace returns true for the given Use.

void	replaceUsesOutsideBlock (Value V, BasicBlock BB)
	replaceUsesOutsideBlock - Go through the uses list for this definition and make each use point to "V" instead of "this" when the use is outside the block.

void	assertModuleIsMaterializedImpl () const

void	assertModuleIsMaterialized () const

bool	use_empty () const

bool	materialized_use_empty () const

use_iterator	materialized_use_begin ()

const_use_iterator	materialized_use_begin () const

use_iterator	use_begin ()

const_use_iterator	use_begin () const

use_iterator	use_end ()

const_use_iterator	use_end () const

iterator_range< use_iterator >	materialized_uses ()

iterator_range< const_use_iterator >	materialized_uses () const

iterator_range< use_iterator >	uses ()

iterator_range< const_use_iterator >	uses () const

bool	user_empty () const

user_iterator	materialized_user_begin ()

const_user_iterator	materialized_user_begin () const

user_iterator	user_begin ()

const_user_iterator	user_begin () const

user_iterator	user_end ()

const_user_iterator	user_end () const

User *	user_back ()

const User *	user_back () const

iterator_range< user_iterator >	materialized_users ()

iterator_range< const_user_iterator >	materialized_users () const

iterator_range< user_iterator >	users ()

iterator_range< const_user_iterator >	users () const

bool	hasOneUse () const
	Return true if there is exactly one use of this value.

bool	hasNUses (unsigned N) const
	Return true if this Value has exactly N uses.

bool	hasNUsesOrMore (unsigned N) const
	Return true if this value has N uses or more.

bool	hasOneUser () const
	Return true if there is exactly one user of this value.

Use *	getSingleUndroppableUse ()
	Return true if there is exactly one use of this value that cannot be dropped.

const Use *	getSingleUndroppableUse () const

User *	getUniqueUndroppableUser ()
	Return true if there is exactly one unique user of this value that cannot be dropped (that user can have multiple uses of this value).

const User *	getUniqueUndroppableUser () const

bool	hasNUndroppableUses (unsigned N) const
	Return true if there this value.

bool	hasNUndroppableUsesOrMore (unsigned N) const
	Return true if this value has N uses or more.

void	dropDroppableUses (llvm::function_ref< bool(const Use )> ShouldDrop=[](const Use ) { return true;})
	Remove every uses that can safely be removed.

void	dropDroppableUsesIn (User &Usr)
	Remove every use of this value in `User` that can safely be removed.

bool	isUsedInBasicBlock (const BasicBlock *BB) const
	Check if this value is used in the specified basic block.

unsigned	getNumUses () const
	This method computes the number of uses of this Value.

void	addUse (Use &U)
	This method should only be used by the Use class.

unsigned	getValueID () const
	Return an ID for the concrete type of this object.

unsigned	getRawSubclassOptionalData () const
	Return the raw optional flags value contained in this value.

void	clearSubclassOptionalData ()
	Clear the optional flags contained in this value.

bool	hasSameSubclassOptionalData (const Value *V) const
	Check the optional flags for equality.

bool	hasValueHandle () const
	Return true if there is a value handle associated with this value.

bool	isUsedByMetadata () const
	Return true if there is metadata referencing this value.

bool	isSwiftError () const
	Return true if this value is a swifterror value.

const Value *	stripPointerCasts () const
	Strip off pointer casts, all-zero GEPs and address space casts.

Value *	stripPointerCasts ()

const Value *	stripPointerCastsAndAliases () const
	Strip off pointer casts, all-zero GEPs, address space casts, and aliases.

Value *	stripPointerCastsAndAliases ()

const Value *	stripPointerCastsSameRepresentation () const
	Strip off pointer casts, all-zero GEPs and address space casts but ensures the representation of the result stays the same.

Value *	stripPointerCastsSameRepresentation ()

const Value *	stripPointerCastsForAliasAnalysis () const
	Strip off pointer casts, all-zero GEPs, single-argument phi nodes and invariant group info.

Value *	stripPointerCastsForAliasAnalysis ()

const Value *	stripInBoundsConstantOffsets () const
	Strip off pointer casts and all-constant inbounds GEPs.

Value *	stripInBoundsConstantOffsets ()

const Value *	stripAndAccumulateConstantOffsets (const DataLayout &DL, APInt &Offset, bool AllowNonInbounds, bool AllowInvariantGroup=false, function_ref< bool(Value &Value, APInt &Offset)> ExternalAnalysis=nullptr) const
	Accumulate the constant offset this value has compared to a base pointer.

Value *	stripAndAccumulateConstantOffsets (const DataLayout &DL, APInt &Offset, bool AllowNonInbounds, bool AllowInvariantGroup=false, function_ref< bool(Value &Value, APInt &Offset)> ExternalAnalysis=nullptr)

const Value *	stripAndAccumulateInBoundsConstantOffsets (const DataLayout &DL, APInt &Offset) const
	This is a wrapper around stripAndAccumulateConstantOffsets with the in-bounds requirement set to false.

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

const Value *	stripInBoundsOffsets (function_ref< void(const Value )> Func=[](const Value ) {}) const
	Strip off pointer casts and inbounds GEPs.

Value *	stripInBoundsOffsets (function_ref< void(const Value )> Func=[](const Value ) {})

std::optional< int64_t >	getPointerOffsetFrom (const Value *Other, const DataLayout &DL) const
	If this ptr is provably equal to `Other` plus a constant offset, return that offset in bytes.

bool	canBeFreed () const
	Return true if the memory object referred to by V can by freed in the scope for which the SSA value defining the allocation is statically defined.

uint64_t	getPointerDereferenceableBytes (const DataLayout &DL, bool &CanBeNull, bool &CanBeFreed) const
	Returns the number of bytes known to be dereferenceable for the pointer value.

Align	getPointerAlignment (const DataLayout &DL) const
	Returns an alignment of the pointer value.

const Value *	DoPHITranslation (const BasicBlock CurBB, const BasicBlock PredBB) const
	Translate PHI node to its predecessor from the given basic block.

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

void	mutateType (Type *Ty)
	Mutate the type of this Value to be of the specified type.

template<class Compare >
void	sortUseList (Compare Cmp)
	Sort the use-list.

void	reverseUseList ()
	Reverse the use-list.

void	print (raw_ostream &O, bool IsForDebug=false) const
	Implement operator<< on Value.

void	print (raw_ostream &O, ModuleSlotTracker &MST, bool IsForDebug=false) const

void	printAsOperand (raw_ostream &O, bool PrintType=true, const Module *M=nullptr) const
	Print the name of this Value out to the specified raw_ostream.

void	printAsOperand (raw_ostream &O, bool PrintType, ModuleSlotTracker &MST) const

Public Member Functions inherited from llvm::ilist_node_with_parent< Instruction, BasicBlock, ilist_iterator_bits< true >, ilist_parent< BasicBlock > >
Instruction *	getPrevNode ()

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

Instruction *	getNextNode ()
	Get the next node, or `nullptr` for the list tail.

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

Public Member Functions inherited from llvm::ilist_node_impl< ilist_detail::compute_node_options< T, Options... >::type >
self_iterator	getIterator ()

const_self_iterator	getIterator () const

reverse_self_iterator	getReverseIterator ()

const_reverse_self_iterator	getReverseIterator () const

bool	isSentinel () const
	Check whether this is the sentinel node.

Public Member Functions inherited from llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >
const ParentTy *	getParent () const

ParentTy *	getParent ()

void	setParent (ParentTy *Parent)

Static Public Member Functions
static bool	classof (const Instruction *I)
	Methods for support type inquiry through isa, cast, and dyn_cast:

static bool	classof (const Value *V)

Static Public Member Functions inherited from llvm::CastInst
static CastInst *	Create (Instruction::CastOps, Value S, Type Ty, const Twine &Name="", InsertPosition InsertBefore=nullptr)
	Provides a way to construct any of the CastInst subclasses using an opcode instead of the subclass's constructor.

static CastInst *	CreateZExtOrBitCast (Value S, Type Ty, const Twine &Name="", InsertPosition InsertBefore=nullptr)
	Create a ZExt or BitCast cast instruction.

static CastInst *	CreateSExtOrBitCast (Value S, Type Ty, const Twine &Name="", InsertPosition InsertBefore=nullptr)
	Create a SExt or BitCast cast instruction.

static CastInst *	CreatePointerCast (Value S, Type Ty, const Twine &Name="", InsertPosition InsertBefore=nullptr)
	Create a BitCast, AddrSpaceCast or a PtrToInt cast instruction.

static CastInst *	CreatePointerBitCastOrAddrSpaceCast (Value S, Type Ty, const Twine &Name="", InsertPosition InsertBefore=nullptr)
	Create a BitCast or an AddrSpaceCast cast instruction.

static CastInst *	CreateBitOrPointerCast (Value S, Type Ty, const Twine &Name="", InsertPosition InsertBefore=nullptr)
	Create a BitCast, a PtrToInt, or an IntToPTr cast instruction.

static CastInst *	CreateIntegerCast (Value S, Type Ty, bool isSigned, const Twine &Name="", InsertPosition InsertBefore=nullptr)
	Create a ZExt, BitCast, or Trunc for int -> int casts.

static CastInst *	CreateFPCast (Value S, Type Ty, const Twine &Name="", InsertPosition InsertBefore=nullptr)
	Create an FPExt, BitCast, or FPTrunc for fp -> fp casts.

static CastInst *	CreateTruncOrBitCast (Value S, Type Ty, const Twine &Name="", InsertPosition InsertBefore=nullptr)
	Create a Trunc or BitCast cast instruction.

static bool	isBitCastable (Type SrcTy, Type DestTy)
	Check whether a bitcast between these types is valid.

static bool	isBitOrNoopPointerCastable (Type SrcTy, Type DestTy, const DataLayout &DL)
	Check whether a bitcast, inttoptr, or ptrtoint cast between these types is valid and a no-op.

static Instruction::CastOps	getCastOpcode (const Value Val, bool SrcIsSigned, Type Ty, bool DstIsSigned)
	Returns the opcode necessary to cast Val into Ty using usual casting rules.

static bool	isNoopCast (Instruction::CastOps Opcode, Type SrcTy, Type DstTy, const DataLayout &DL)
	A no-op cast is one that can be effected without changing any bits.

static unsigned	isEliminableCastPair (Instruction::CastOps firstOpcode, Instruction::CastOps secondOpcode, Type SrcTy, Type MidTy, Type DstTy, Type SrcIntPtrTy, Type MidIntPtrTy, Type DstIntPtrTy)
	Determine how a pair of casts can be eliminated, if they can be at all.

static bool	castIsValid (Instruction::CastOps op, Type SrcTy, Type DstTy)
	This method can be used to determine if a cast from SrcTy to DstTy using Opcode op is valid or not.

static bool	castIsValid (Instruction::CastOps op, Value S, Type DstTy)

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

static bool	classof (const Value *V)

Static Public Member Functions inherited from llvm::UnaryInstruction
static bool	classof (const Instruction *I)

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	isUnaryOp (unsigned Opcode)

static bool	isBinaryOp (unsigned Opcode)

static bool	isIntDivRem (unsigned Opcode)

static bool	isFPDivRem (unsigned Opcode)

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

static bool	isBitwiseLogicOp (unsigned Opcode)
	Determine if the Opcode is and/or/xor.

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

static bool	isFuncletPad (unsigned Opcode)
	Determine if the Opcode is one of the FuncletPadInst instructions.

static bool	isSpecialTerminator (unsigned Opcode)
	Returns true if the Opcode is a "special" terminator that does more than branch to a successor (e.g.

static bool	isAssociative (unsigned Opcode)

static bool	isCommutative (unsigned Opcode)

static bool	isIdempotent (unsigned Opcode)

static bool	isNilpotent (unsigned Opcode)

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

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

Static Public Member Functions inherited from llvm::Value
static void	dropDroppableUse (Use &U)
	Remove the droppable use `U`.

Protected Member Functions
TruncInst *	cloneImpl () const
	Clone an identical TruncInst.

Protected Member Functions inherited from llvm::CastInst
	CastInst (Type Ty, unsigned iType, Value S, const Twine &NameStr="", InsertPosition InsertBefore=nullptr)
	Constructor with insert-before-instruction semantics for subclasses.

Protected Member Functions inherited from llvm::UnaryInstruction
	UnaryInstruction (Type Ty, unsigned iType, Value V, InsertPosition InsertBefore=nullptr)

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

template<typename BitfieldElement >
BitfieldElement::Type	getSubclassData () const

template<typename BitfieldElement >
void	setSubclassData (typename BitfieldElement::Type Value)

	Instruction (Type *Ty, unsigned iType, AllocInfo AllocInfo, InsertPosition InsertBefore=nullptr)

Protected Member Functions inherited from llvm::User
void *	operator new (size_t Size)=delete

void *	operator new (size_t Size, HungOffOperandsAllocMarker)
	Allocate a User with an operand pointer co-allocated.

void *	operator new (size_t Size, IntrusiveOperandsAllocMarker allocTrait)
	Allocate a User with the operands co-allocated.

void *	operator new (size_t Size, IntrusiveOperandsAndDescriptorAllocMarker allocTrait)
	Allocate a User with the operands co-allocated.

	User (Type *ty, unsigned vty, AllocInfo AllocInfo)

void	allocHungoffUses (unsigned N, bool IsPhi=false)
	Allocate the array of Uses, followed by a pointer (with bottom bit set) to the User.

void	growHungoffUses (unsigned N, bool IsPhi=false)
	Grow the number of hung off uses.

	~User ()=default

template<int Idx>
Use &	Op ()

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

Protected Member Functions inherited from llvm::Value
	Value (Type *Ty, unsigned scid)

	~Value ()
	Value's destructor should be virtual by design, but that would require that Value and all of its subclasses have a vtable that effectively duplicates the information in the value ID.

void	getAllMetadata (SmallVectorImpl< std::pair< unsigned, MDNode * > > &MDs) const
	Appends all metadata attached to this value to `MDs`, sorting by KindID.

bool	hasMetadata () const
	Return true if this value has any metadata attached to it.

bool	eraseMetadata (unsigned KindID)
	Erase all metadata attachments with the given kind.

void	eraseMetadataIf (function_ref< bool(unsigned, MDNode *)> Pred)
	Erase all metadata attachments matching the given predicate.

void	clearMetadata ()
	Erase all metadata attached to this Value.

MDNode *	getMetadataImpl (unsigned KindID) const
	Get metadata for the given kind, if any.

unsigned short	getSubclassDataFromValue () const

void	setValueSubclassData (unsigned short D)

MDNode *	getMetadata (unsigned KindID) const
	Get the current metadata attachments for the given kind, if any.

MDNode *	getMetadata (StringRef Kind) const

void	getMetadata (unsigned KindID, SmallVectorImpl< MDNode * > &MDs) const
	Appends all attachments with the given ID to `MDs` in insertion order.

void	getMetadata (StringRef Kind, SmallVectorImpl< MDNode * > &MDs) const

bool	hasMetadata (unsigned KindID) const
	Return true if this value has the given type of metadata attached.

bool	hasMetadata (StringRef Kind) const

void	setMetadata (unsigned KindID, MDNode *Node)
	Set a particular kind of metadata attachment.

void	setMetadata (StringRef Kind, MDNode *Node)

void	addMetadata (unsigned KindID, MDNode &MD)
	Add a metadata attachment.

void	addMetadata (StringRef Kind, MDNode &MD)

Protected Member Functions inherited from llvm::ilist_node_with_parent< Instruction, BasicBlock, ilist_iterator_bits< true >, ilist_parent< BasicBlock > >
	ilist_node_with_parent ()=default

Protected Member Functions inherited from llvm::ilist_node_impl< ilist_detail::compute_node_options< T, Options... >::type >
	ilist_node_impl ()=default

Friends
class	Instruction

Additional Inherited Members
Public Attributes inherited from llvm::Instruction
DbgMarker *	DebugMarker = nullptr
	Optional marker recording the position for debugging information that takes effect immediately before this instruction.

Static Public Attributes inherited from llvm::Value
static constexpr unsigned	MaxAlignmentExponent = 32
	The maximum alignment for instructions.

static constexpr uint64_t	MaximumAlignment = 1ULL << MaxAlignmentExponent

Protected Types inherited from llvm::Instruction
using	OpaqueField = Bitfield::Element< uint16_t, 0, 15 >

template<unsigned Offset>
using	AlignmentBitfieldElementT = typename Bitfield::Element< unsigned, Offset, 6, Value::MaxAlignmentExponent >

template<unsigned Offset>
using	BoolBitfieldElementT = typename Bitfield::Element< bool, Offset, 1 >

template<unsigned Offset>
using	AtomicOrderingBitfieldElementT = typename Bitfield::Element< AtomicOrdering, Offset, 3, AtomicOrdering::LAST >

Protected Types inherited from llvm::Value
enum	: unsigned { NumUserOperandsBits = 27 }
	The number of operands in the subclass. More...

Protected Types inherited from llvm::ilist_node_impl< ilist_detail::compute_node_options< T, Options... >::type >
using	self_iterator = typename ilist_select_iterator_type< OptionsT::has_iterator_bits, ilist_detail::compute_node_options< T, Options... >::type, false, false >::type

using	const_self_iterator = typename ilist_select_iterator_type< OptionsT::has_iterator_bits, ilist_detail::compute_node_options< T, Options... >::type, false, true >::type

using	reverse_self_iterator = typename ilist_select_iterator_type< OptionsT::has_iterator_bits, ilist_detail::compute_node_options< T, Options... >::type, true, false >::type

using	const_reverse_self_iterator = typename ilist_select_iterator_type< OptionsT::has_iterator_bits, ilist_detail::compute_node_options< T, Options... >::type, true, true >::type

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

Protected Attributes inherited from llvm::Value
unsigned char	SubclassOptionalData: 7
	Hold subclass data that can be dropped.

unsigned	NumUserOperands: NumUserOperandsBits

unsigned	IsUsedByMD: 1

unsigned	HasName: 1

unsigned	HasMetadata: 1

unsigned	HasHungOffUses: 1

unsigned	HasDescriptor: 1

Detailed Description

This class represents a truncation of integer types.

Definition at line 4498 of file Instructions.h.

Member Enumeration Documentation

◆ anonymous enum

anonymous enum

Enumerator
AnyWrap
NoUnsignedWrap
NoSignedWrap

Definition at line 4507 of file Instructions.h.

Constructor & Destructor Documentation

◆ TruncInst()

TruncInst::TruncInst	(	Value *	S,
		Type *	Ty,
		const Twine &	NameStr = `""`,
		InsertPosition	InsertBefore = `nullptr`
	)

Constructor with insert-before-instruction semantics.

Parameters

S	The value to be truncated
Ty	The (smaller) type to truncate to
NameStr	A name for the new instruction
InsertBefore	Where to insert the new instruction

Definition at line 3340 of file Instructions.cpp.

References assert(), llvm::CastInst::castIsValid(), and llvm::CastInst::getOpcode().

Member Function Documentation

◆ classof() [1/2]

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

inlinestatic

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

Definition at line 4518 of file Instructions.h.

References I.

Referenced by classof().

◆ classof() [2/2]

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

inlinestatic

Definition at line 4521 of file Instructions.h.

References classof().

◆ cloneImpl()

TruncInst * TruncInst::cloneImpl ( ) const

protected

Clone an identical TruncInst.

Definition at line 4305 of file Instructions.cpp.

References llvm::User::getOperand(), and llvm::Value::getType().

◆ getNoWrapKind()

unsigned llvm::TruncInst::getNoWrapKind ( ) const

inline

Returns the no-wrap kind of the operation.

Definition at line 4547 of file Instructions.h.

References hasNoSignedWrap(), hasNoUnsignedWrap(), NoSignedWrap, and NoUnsignedWrap.

◆ hasNoSignedWrap()

bool llvm::TruncInst::hasNoSignedWrap ( ) const

inline

Test whether this operation is known to never undergo signed overflow, aka the nsw property.

Definition at line 4542 of file Instructions.h.

References NoSignedWrap, and llvm::Value::SubclassOptionalData.

Referenced by llvm::InstCombinerImpl::foldICmpTruncConstant(), getNoWrapKind(), and llvm::InstCombinerImpl::visitTrunc().

◆ hasNoUnsignedWrap()

bool llvm::TruncInst::hasNoUnsignedWrap ( ) const

inline

Test whether this operation is known to never undergo unsigned overflow, aka the nuw property.

Definition at line 4536 of file Instructions.h.

References NoUnsignedWrap, and llvm::Value::SubclassOptionalData.

Referenced by llvm::InstCombinerImpl::foldICmpTruncConstant(), getNoWrapKind(), and llvm::InstCombinerImpl::visitTrunc().

◆ setHasNoSignedWrap()

void llvm::TruncInst::setHasNoSignedWrap ( bool B )

inline

Definition at line 4529 of file Instructions.h.

References B, NoSignedWrap, and llvm::Value::SubclassOptionalData.

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

◆ setHasNoUnsignedWrap()

void llvm::TruncInst::setHasNoUnsignedWrap ( bool B )

inline

Definition at line 4525 of file Instructions.h.

References B, NoUnsignedWrap, and llvm::Value::SubclassOptionalData.

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

Friends And Related Function Documentation

◆ Instruction

friend class Instruction

friend

Definition at line 4501 of file Instructions.h.

The documentation for this class was generated from the following files:

include/llvm/IR/Instructions.h
lib/IR/Instructions.cpp

Public Types

Public Member Functions

Static Public Member Functions

Protected Member Functions

Friends

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

◆ anonymous enum

Constructor & Destructor Documentation

◆ TruncInst()

Member Function Documentation

◆ classof() [1/2]

◆ classof() [2/2]

◆ cloneImpl()

◆ getNoWrapKind()

◆ hasNoSignedWrap()

◆ hasNoUnsignedWrap()

◆ setHasNoSignedWrap()

◆ setHasNoUnsignedWrap()

Friends And Related Function Documentation

◆ Instruction