class CastInst

Declaration

class CastInst : public UnaryInstruction { /* full declaration omitted */ };

Declared at: llvm/include/llvm/IR/InstrTypes.h:439

Inherits from: UnaryInstruction

Member Variables

Inherited from Value:

protected SubclassOptionalData

protected NumUserOperands

protected IsUsedByMD

protected HasName

protected HasHungOffUses

protected HasDescriptor

public static MaxAlignmentExponent = 29

public static MaximumAlignment = 1U << MaxAlignmentExponent

Method Overview

• protected CastInst(llvm::Type * Ty, unsigned int iType, llvm::Value * S, const llvm::Twine & NameStr, llvm::BasicBlock * InsertAtEnd)
• protected CastInst(llvm::Type * Ty, unsigned int iType, llvm::Value * S, const llvm::Twine & NameStr = "", llvm::Instruction * InsertBefore = nullptr)
• public static llvm::CastInst * Create(Instruction::CastOps, llvm::Value * S, llvm::Type * Ty, const llvm::Twine & Name = "", llvm::Instruction * InsertBefore = nullptr)
• public static llvm::CastInst * Create(Instruction::CastOps, llvm::Value * S, llvm::Type * Ty, const llvm::Twine & Name, llvm::BasicBlock * InsertAtEnd)
• public static llvm::CastInst * CreateBitOrPointerCast(llvm::Value * S, llvm::Type * Ty, const llvm::Twine & Name = "", llvm::Instruction * InsertBefore = nullptr)
• public static llvm::CastInst * CreateFPCast(llvm::Value * S, llvm::Type * Ty, const llvm::Twine & Name, llvm::BasicBlock * InsertAtEnd)
• public static llvm::CastInst * CreateFPCast(llvm::Value * S, llvm::Type * Ty, const llvm::Twine & Name = "", llvm::Instruction * InsertBefore = nullptr)
• public static llvm::CastInst * CreateIntegerCast(llvm::Value * S, llvm::Type * Ty, bool isSigned, const llvm::Twine & Name = "", llvm::Instruction * InsertBefore = nullptr)
• public static llvm::CastInst * CreateIntegerCast(llvm::Value * S, llvm::Type * Ty, bool isSigned, const llvm::Twine & Name, llvm::BasicBlock * InsertAtEnd)
• public static llvm::CastInst * CreatePointerBitCastOrAddrSpaceCast(llvm::Value * S, llvm::Type * Ty, const llvm::Twine & Name, llvm::BasicBlock * InsertAtEnd)
• public static llvm::CastInst * CreatePointerBitCastOrAddrSpaceCast(llvm::Value * S, llvm::Type * Ty, const llvm::Twine & Name = "", llvm::Instruction * InsertBefore = nullptr)
• public static llvm::CastInst * CreatePointerCast(llvm::Value * S, llvm::Type * Ty, const llvm::Twine & Name, llvm::BasicBlock * InsertAtEnd)
• public static llvm::CastInst * CreatePointerCast(llvm::Value * S, llvm::Type * Ty, const llvm::Twine & Name = "", llvm::Instruction * InsertBefore = nullptr)
• public static llvm::CastInst * CreateSExtOrBitCast(llvm::Value * S, llvm::Type * Ty, const llvm::Twine & Name, llvm::BasicBlock * InsertAtEnd)
• public static llvm::CastInst * CreateSExtOrBitCast(llvm::Value * S, llvm::Type * Ty, const llvm::Twine & Name = "", llvm::Instruction * InsertBefore = nullptr)
• public static llvm::CastInst * CreateTruncOrBitCast(llvm::Value * S, llvm::Type * Ty, const llvm::Twine & Name, llvm::BasicBlock * InsertAtEnd)
• public static llvm::CastInst * CreateTruncOrBitCast(llvm::Value * S, llvm::Type * Ty, const llvm::Twine & Name = "", llvm::Instruction * InsertBefore = nullptr)
• public static llvm::CastInst * CreateZExtOrBitCast(llvm::Value * S, llvm::Type * Ty, const llvm::Twine & Name = "", llvm::Instruction * InsertBefore = nullptr)
• public static llvm::CastInst * CreateZExtOrBitCast(llvm::Value * S, llvm::Type * Ty, const llvm::Twine & Name, llvm::BasicBlock * InsertAtEnd)
• public static bool castIsValid(Instruction::CastOps op, llvm::Value * S, llvm::Type * DstTy)
• public static bool classof(const llvm::Value * V)
• public static bool classof(const llvm::Instruction * I)
• public static Instruction::CastOps getCastOpcode(const llvm::Value * Val, bool SrcIsSigned, llvm::Type * Ty, bool DstIsSigned)
• public llvm::Type * getDestTy() const
• public Instruction::CastOps getOpcode() const
• public llvm::Type * getSrcTy() const
• public static bool isBitCastable(llvm::Type * SrcTy, llvm::Type * DestTy)
• public static bool isBitOrNoopPointerCastable(llvm::Type * SrcTy, llvm::Type * DestTy, const llvm::DataLayout & DL)
• public static bool isCastable(llvm::Type * SrcTy, llvm::Type * DestTy)
• public static unsigned int isEliminableCastPair(Instruction::CastOps firstOpcode, Instruction::CastOps secondOpcode, llvm::Type * SrcTy, llvm::Type * MidTy, llvm::Type * DstTy, llvm::Type * SrcIntPtrTy, llvm::Type * MidIntPtrTy, llvm::Type * DstIntPtrTy)
• public bool isIntegerCast() const
• public bool isLosslessCast() const
• public static bool isNoopCast(Instruction::CastOps Opcode, llvm::Type * SrcTy, llvm::Type * DstTy, const llvm::DataLayout & DL)
• public bool isNoopCast(const llvm::DataLayout & DL) const

Inherited from UnaryInstruction:

• public classof
• public classof

Inherited from Instruction:

• public andIRFlags
• public applyMergedLocation
• public classof
• public clone
• public copyFastMathFlags
• public copyFastMathFlags
• public copyIRFlags
• public copyMetadata
• public dropPoisonGeneratingFlags
• public dropUnknownNonDebugMetadata
• public dropUnknownNonDebugMetadata
• public dropUnknownNonDebugMetadata
• public dropUnknownNonDebugMetadata
• public eraseFromParent
• public extractProfMetadata
• public extractProfTotalWeight
• public getAAMetadata
• public getAllMetadata
• public getAllMetadataOtherThanDebugLoc
• public getDebugLoc
• public getFastMathFlags
• public getFunction
• public getFunction
• public getMetadata
• public getMetadata
• public getModule
• public getModule
• public getNextNonDebugInstruction
• public getNextNonDebugInstruction
• public getNumSuccessors
• public getOpcode
• public getOpcodeName
• public getOpcodeName
• public getParent
• public getParent
• public getPrevNonDebugInstruction
• public getPrevNonDebugInstruction
• protected getSubclassDataFromInstruction
• public getSuccessor
• public hasAllowContract
• public hasAllowReassoc
• public hasAllowReciprocal
• public hasApproxFunc
• public hasAtomicLoad
• public hasAtomicStore
• public hasMetadata
• public hasMetadata
• public hasMetadata
• public hasMetadataOtherThanDebugLoc
• public hasNoInfs
• public hasNoNaNs
• public hasNoSignedWrap
• public hasNoSignedZeros
• public hasNoUnsignedWrap
• public insertAfter
• public insertBefore
• public isArithmeticShift
• public isAssociative
• public isAssociative
• public isAtomic
• public isBinaryOp
• public isBinaryOp
• public isBitwiseLogicOp
• public isBitwiseLogicOp
• public isCast
• public isCast
• public isCommutative
• public isCommutative
• public isEHPad
• public isExact
• public isExceptionalTerminator
• public isExceptionalTerminator
• public isFast
• public isFenceLike
• public isFuncletPad
• public isFuncletPad
• public isIdempotent
• public isIdempotent
• public isIdenticalTo
• public isIdenticalToWhenDefined
• public isIndirectTerminator
• public isIndirectTerminator
• public isIntDivRem
• public isIntDivRem
• public isLifetimeStartOrEnd
• public isLogicalShift
• public isNilpotent
• public isNilpotent
• public isSafeToRemove
• public isSameOperationAs
• public isShift
• public isShift
• public isTerminator
• public isTerminator
• public isUnaryOp
• public isUnaryOp
• public isUsedOutsideOfBlock
• public mayHaveSideEffects
• public mayReadFromMemory
• public mayReadOrWriteMemory
• public mayThrow
• public mayWriteToMemory
• public moveAfter
• public moveBefore
• public moveBefore
• public removeFromParent
• public replaceSuccessorWith
• public setAAMetadata
• public setDebugLoc
• public setFast
• public setFastMathFlags
• public setHasAllowReassoc
• public setHasAllowReciprocal
• public setHasApproxFunc
• public setHasNoInfs
• public setHasNoNaNs
• public setHasNoSignedWrap
• public setHasNoSignedZeros
• public setHasNoUnsignedWrap
• protected setInstructionSubclassData
• public setIsExact
• public setMetadata
• public setMetadata
• public setProfWeight
• public setSuccessor
• public swapProfMetadata
• public user_back
• public user_back

Inherited from User:

• protected Op
• protected Op
• protected OpFrom
• protected allocHungoffUses
• public classof
• public dropAllReferences
• public getDescriptor
• public getDescriptor
• public getNumOperands
• public getOperand
• public getOperandList
• public getOperandList
• public getOperandUse
• public getOperandUse
• protected growHungoffUses
• public op_begin
• public op_begin
• public op_end
• public op_end
• public operand_values
• public operand_values
• public operands
• public operands
• public replaceUsesOfWith
• public setGlobalVariableNumOperands
• public setNumHungOffUseOperands
• public setOperand
• public value_op_begin
• public value_op_begin
• public value_op_end
• public value_op_end

Inherited from Value:

• public DoPHITranslation
• public DoPHITranslation
• public addUse
• public assertModuleIsMaterialized
• public assertModuleIsMaterializedImpl
• public clearSubclassOptionalData
• public deleteValue
• public dump
• public getContext
• public getName
• public getNumUses
• public getPointerAlignment
• public getPointerDereferenceableBytes
• public getRawSubclassOptionalData
• protected getSubclassDataFromValue
• public getType
• public getValueID
• public getValueName
• public hasNUses
• public hasNUsesOrMore
• public hasName
• public hasOneUse
• public hasSameSubclassOptionalData
• public hasValueHandle
• public isSwiftError
• public isUsedByMetadata
• public isUsedInBasicBlock
• public materialized_use_begin
• public materialized_use_begin
• public materialized_use_empty
• public materialized_user_begin
• public materialized_user_begin
• public materialized_users
• public materialized_users
• public materialized_uses
• public materialized_uses
• public mutateType
• public print
• public print
• public printAsOperand
• public printAsOperand
• public replaceAllUsesWith
• public replaceNonMetadataUsesWith
• public replaceUsesOutsideBlock
• public replaceUsesWithIf
• public reverseUseList
• public setName
• public setValueName
• protected setValueSubclassData
• public sortUseList
• public stripAndAccumulateConstantOffsets
• public stripAndAccumulateConstantOffsets
• public stripAndAccumulateInBoundsConstantOffsets
• public stripAndAccumulateInBoundsConstantOffsets
• public stripInBoundsConstantOffsets
• public stripInBoundsConstantOffsets
• public stripInBoundsOffsets
• public stripInBoundsOffsets
• public stripPointerCasts
• public stripPointerCasts
• public stripPointerCastsAndAliases
• public stripPointerCastsAndAliases
• public stripPointerCastsAndInvariantGroups
• public stripPointerCastsAndInvariantGroups
• public stripPointerCastsSameRepresentation
• public stripPointerCastsSameRepresentation
• public takeName
• public use_begin
• public use_begin
• public use_empty
• public use_end
• public use_end
• public user_back
• public user_back
• public user_begin
• public user_begin
• public user_empty
• public user_end
• public user_end
• public users
• public users
• public uses
• public uses

Methods

¶CastInst(llvm::Type* Ty,
         unsigned int iType,
         llvm::Value* S,
         const llvm::Twine& NameStr,
         llvm::BasicBlock* InsertAtEnd)

Description

Constructor with insert-at-end-of-block semantics for subclasses

Declared at: llvm/include/llvm/IR/InstrTypes.h:448

Parameters

llvm::Type* Ty

unsigned int iType

llvm::Value* S

const llvm::Twine& NameStr

llvm::BasicBlock* InsertAtEnd

¶CastInst(
    llvm::Type* Ty,
    unsigned int iType,
    llvm::Value* S,
    const llvm::Twine& NameStr = "",
    llvm::Instruction* InsertBefore = nullptr)

Description

Constructor with insert-before-instruction semantics for subclasses

Declared at: llvm/include/llvm/IR/InstrTypes.h:442

Parameters

llvm::Type* Ty

unsigned int iType

llvm::Value* S

const llvm::Twine& NameStr = ""

llvm::Instruction* InsertBefore = nullptr

¶static llvm::CastInst* Create(
    Instruction::CastOps,
    llvm::Value* S,
    llvm::Type* Ty,
    const llvm::Twine& Name = "",
    llvm::Instruction* InsertBefore = nullptr)

Description

Provides a way to construct any of the CastInst subclasses using an opcode instead of the subclass's constructor. The opcode must be in the CastOps category (Instruction::isCast(opcode) returns true). This constructor has insert-before-instruction semantics to automatically insert the new CastInst before InsertBefore (if it is non-null). Construct any of the CastInst subclasses

Declared at: llvm/include/llvm/IR/InstrTypes.h:461

Parameters

Instruction::CastOps

llvm::Value* S

llvm::Type* Ty

const llvm::Twine& Name = ""

llvm::Instruction* InsertBefore = nullptr

¶static llvm::CastInst* Create(
    Instruction::CastOps,
    llvm::Value* S,
    llvm::Type* Ty,
    const llvm::Twine& Name,
    llvm::BasicBlock* InsertAtEnd)

Description

Provides a way to construct any of the CastInst subclasses using an opcode instead of the subclass's constructor. The opcode must be in the CastOps category. This constructor has insert-at-end-of-block semantics to automatically insert the new CastInst at the end of InsertAtEnd (if its non-null). Construct any of the CastInst subclasses

Declared at: llvm/include/llvm/IR/InstrTypes.h:474

Parameters

Instruction::CastOps

llvm::Value* S

llvm::Type* Ty

const llvm::Twine& Name

llvm::BasicBlock* InsertAtEnd

¶static llvm::CastInst* CreateBitOrPointerCast(
    llvm::Value* S,
    llvm::Type* Ty,
    const llvm::Twine& Name = "",
    llvm::Instruction* InsertBefore = nullptr)

Description

Create a BitCast, a PtrToInt, or an IntToPTr cast instruction. If the value is a pointer type and the destination an integer type, creates a PtrToInt cast. If the value is an integer type and the destination a pointer type, creates an IntToPtr cast. Otherwise, creates a bitcast.

Declared at: llvm/include/llvm/IR/InstrTypes.h:552

Parameters

llvm::Value* S

llvm::Type* Ty

const llvm::Twine& Name = ""

llvm::Instruction* InsertBefore = nullptr

¶static llvm::CastInst* CreateFPCast(
    llvm::Value* S,
    llvm::Type* Ty,
    const llvm::Twine& Name,
    llvm::BasicBlock* InsertAtEnd)

Description

Create an FPExt, BitCast, or FPTrunc for fp -> fp casts

Declared at: llvm/include/llvm/IR/InstrTypes.h:586

Parameters

llvm::Value* S

llvm::Type* Ty

const llvm::Twine& Name

llvm::BasicBlock* InsertAtEnd

¶static llvm::CastInst* CreateFPCast(
    llvm::Value* S,
    llvm::Type* Ty,
    const llvm::Twine& Name = "",
    llvm::Instruction* InsertBefore = nullptr)

Description

Create an FPExt, BitCast, or FPTrunc for fp -> fp casts

Declared at: llvm/include/llvm/IR/InstrTypes.h:578

Parameters

llvm::Value* S

llvm::Type* Ty

const llvm::Twine& Name = ""

llvm::Instruction* InsertBefore = nullptr

¶static llvm::CastInst* CreateIntegerCast(
    llvm::Value* S,
    llvm::Type* Ty,
    bool isSigned,
    const llvm::Twine& Name = "",
    llvm::Instruction* InsertBefore = nullptr)

Description

Create a ZExt, BitCast, or Trunc for int -> int casts.

Declared at: llvm/include/llvm/IR/InstrTypes.h:560

Parameters

llvm::Value* S

llvm::Type* Ty

bool isSigned

const llvm::Twine& Name = ""

llvm::Instruction* InsertBefore = nullptr

¶static llvm::CastInst* CreateIntegerCast(
    llvm::Value* S,
    llvm::Type* Ty,
    bool isSigned,
    const llvm::Twine& Name,
    llvm::BasicBlock* InsertAtEnd)

Description

Create a ZExt, BitCast, or Trunc for int -> int casts.

Declared at: llvm/include/llvm/IR/InstrTypes.h:569

Parameters

llvm::Value* S

llvm::Type* Ty

bool isSigned

const llvm::Twine& Name

llvm::BasicBlock* InsertAtEnd

¶static llvm::CastInst*
CreatePointerBitCastOrAddrSpaceCast(
    llvm::Value* S,
    llvm::Type* Ty,
    const llvm::Twine& Name,
    llvm::BasicBlock* InsertAtEnd)

Description

Create a BitCast or an AddrSpaceCast cast instruction.

Declared at: llvm/include/llvm/IR/InstrTypes.h:531

Parameters

llvm::Value* S

llvm::Type* Ty

const llvm::Twine& Name

llvm::BasicBlock* InsertAtEnd

¶static llvm::CastInst*
CreatePointerBitCastOrAddrSpaceCast(
    llvm::Value* S,
    llvm::Type* Ty,
    const llvm::Twine& Name = "",
    llvm::Instruction* InsertBefore = nullptr)

Description

Create a BitCast or an AddrSpaceCast cast instruction.

Declared at: llvm/include/llvm/IR/InstrTypes.h:539

Parameters

llvm::Value* S

llvm::Type* Ty

const llvm::Twine& Name = ""

llvm::Instruction* InsertBefore = nullptr

¶static llvm::CastInst* CreatePointerCast(
    llvm::Value* S,
    llvm::Type* Ty,
    const llvm::Twine& Name,
    llvm::BasicBlock* InsertAtEnd)

Description

Create a BitCast AddrSpaceCast, or a PtrToInt cast instruction.

Declared at: llvm/include/llvm/IR/InstrTypes.h:515

Parameters

llvm::Value* S

llvm::Type* Ty

const llvm::Twine& Name

llvm::BasicBlock* InsertAtEnd

¶static llvm::CastInst* CreatePointerCast(
    llvm::Value* S,
    llvm::Type* Ty,
    const llvm::Twine& Name = "",
    llvm::Instruction* InsertBefore = nullptr)

Description

Create a BitCast, AddrSpaceCast or a PtrToInt cast instruction.

Declared at: llvm/include/llvm/IR/InstrTypes.h:523

Parameters

llvm::Value* S

llvm::Type* Ty

const llvm::Twine& Name = ""

llvm::Instruction* InsertBefore = nullptr

¶static llvm::CastInst* CreateSExtOrBitCast(
    llvm::Value* S,
    llvm::Type* Ty,
    const llvm::Twine& Name,
    llvm::BasicBlock* InsertAtEnd)

Description

Create a SExt or BitCast cast instruction

Declared at: llvm/include/llvm/IR/InstrTypes.h:507

Parameters

llvm::Value* S

llvm::Type* Ty

const llvm::Twine& Name

llvm::BasicBlock* InsertAtEnd

¶static llvm::CastInst* CreateSExtOrBitCast(
    llvm::Value* S,
    llvm::Type* Ty,
    const llvm::Twine& Name = "",
    llvm::Instruction* InsertBefore = nullptr)

Description

Create a SExt or BitCast cast instruction

Declared at: llvm/include/llvm/IR/InstrTypes.h:499

Parameters

llvm::Value* S

llvm::Type* Ty

const llvm::Twine& Name = ""

llvm::Instruction* InsertBefore = nullptr

¶static llvm::CastInst* CreateTruncOrBitCast(
    llvm::Value* S,
    llvm::Type* Ty,
    const llvm::Twine& Name,
    llvm::BasicBlock* InsertAtEnd)

Description

Create a Trunc or BitCast cast instruction

Declared at: llvm/include/llvm/IR/InstrTypes.h:602

Parameters

llvm::Value* S

llvm::Type* Ty

const llvm::Twine& Name

llvm::BasicBlock* InsertAtEnd

¶static llvm::CastInst* CreateTruncOrBitCast(
    llvm::Value* S,
    llvm::Type* Ty,
    const llvm::Twine& Name = "",
    llvm::Instruction* InsertBefore = nullptr)

Description

Create a Trunc or BitCast cast instruction

Declared at: llvm/include/llvm/IR/InstrTypes.h:594

Parameters

llvm::Value* S

llvm::Type* Ty

const llvm::Twine& Name = ""

llvm::Instruction* InsertBefore = nullptr

¶static llvm::CastInst* CreateZExtOrBitCast(
    llvm::Value* S,
    llvm::Type* Ty,
    const llvm::Twine& Name = "",
    llvm::Instruction* InsertBefore = nullptr)

Description

Create a ZExt or BitCast cast instruction

Declared at: llvm/include/llvm/IR/InstrTypes.h:483

Parameters

llvm::Value* S

llvm::Type* Ty

const llvm::Twine& Name = ""

llvm::Instruction* InsertBefore = nullptr

¶static llvm::CastInst* CreateZExtOrBitCast(
    llvm::Value* S,
    llvm::Type* Ty,
    const llvm::Twine& Name,
    llvm::BasicBlock* InsertAtEnd)

Description

Create a ZExt or BitCast cast instruction

Declared at: llvm/include/llvm/IR/InstrTypes.h:491

Parameters

llvm::Value* S

llvm::Type* Ty

const llvm::Twine& Name

llvm::BasicBlock* InsertAtEnd

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

Description

This method can be used to determine if a cast from S to DstTy using Opcode op is valid or not.

Declared at: llvm/include/llvm/IR/InstrTypes.h:705

Parameters

Instruction::CastOps op

llvm::Value* S

llvm::Type* DstTy

Returns

true iff the proposed cast is valid. Determine if a cast is valid without creating one.

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

Declared at: llvm/include/llvm/IR/InstrTypes.h:711

Parameters

const llvm::Value* V

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

Description

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

Declared at: llvm/include/llvm/IR/InstrTypes.h:708

Parameters

const llvm::Instruction* I

¶static Instruction::CastOps getCastOpcode(
    const llvm::Value* Val,
    bool SrcIsSigned,
    llvm::Type* Ty,
    bool DstIsSigned)

Description

Returns the opcode necessary to cast Val into Ty using usual casting rules. Infer the opcode for cast operand and type

Declared at: llvm/include/llvm/IR/InstrTypes.h:634

Parameters

const llvm::Value* Val

bool SrcIsSigned

llvm::Type* Ty

bool DstIsSigned

¶llvm::Type* getDestTy() const

Description

Return the destination type, as a convenience

Declared at: llvm/include/llvm/IR/InstrTypes.h:699

¶Instruction::CastOps getOpcode() const

Description

Return the opcode of this CastInst

Declared at: llvm/include/llvm/IR/InstrTypes.h:692

¶llvm::Type* getSrcTy() const

Description

Return the source type, as a convenience

Declared at: llvm/include/llvm/IR/InstrTypes.h:697

¶static bool isBitCastable(llvm::Type* SrcTy,
                          llvm::Type* DestTy)

Description

Check whether a bitcast between these types is valid

Declared at: llvm/include/llvm/IR/InstrTypes.h:616

Parameters

llvm::Type* SrcTy

llvm::Type* DestTy

¶static bool isBitOrNoopPointerCastable(
    llvm::Type* SrcTy,
    llvm::Type* DestTy,
    const llvm::DataLayout& DL)

Description

Check whether a bitcast, inttoptr, or ptrtoint cast between these types is valid and a no-op. This ensures that any pointer < ->integer cast has enough bits in the integer and any other cast is a bitcast.

Declared at: llvm/include/llvm/IR/InstrTypes.h:626

Parameters

llvm::Type* SrcTy

llvm::Type* DestTy

const llvm::DataLayout& DL

¶static bool isCastable(llvm::Type* SrcTy,
                       llvm::Type* DestTy)

Description

Check whether it is valid to call getCastOpcode for these types.

Declared at: llvm/include/llvm/IR/InstrTypes.h:610

Parameters

llvm::Type* SrcTy

llvm::Type* DestTy

¶static unsigned int isEliminableCastPair(
    Instruction::CastOps firstOpcode,
    Instruction::CastOps secondOpcode,
    llvm::Type* SrcTy,
    llvm::Type* MidTy,
    llvm::Type* DstTy,
    llvm::Type* SrcIntPtrTy,
    llvm::Type* MidIntPtrTy,
    llvm::Type* DstIntPtrTy)

Description

Determine how a pair of casts can be eliminated, if they can be at all. This is a helper function for both CastInst and ConstantExpr.

Declared at: llvm/include/llvm/IR/InstrTypes.h:680

Parameters

Instruction::CastOps firstOpcode

Instruction::CastOps secondOpcode

llvm::Type* SrcTy

llvm::Type* MidTy

llvm::Type* DstTy

llvm::Type* SrcIntPtrTy

llvm::Type* MidIntPtrTy

llvm::Type* DstIntPtrTy

Returns

0 if the CastInst pair can't be eliminated, otherwise returns Instruction::CastOps value for a cast that can replace the pair, casting SrcTy to DstTy. Determine if a cast pair is eliminable

¶bool isIntegerCast() const

Description

There are several places where we need to know if a cast instruction only deals with integer source and destination types. To simplify that logic, this method is provided.

Declared at: llvm/include/llvm/IR/InstrTypes.h:646

Returns

true iff the cast has only integral typed operand and dest type. Determine if this is an integer-only cast.

¶bool isLosslessCast() const

Description

A lossless cast is one that does not alter the basic value. It implies a no-op cast but is more stringent, preventing things like int->float, long->double, or int->ptr.

Declared at: llvm/include/llvm/IR/InstrTypes.h:653

Returns

true iff the cast is lossless. Determine if this is a lossless cast.

¶static bool isNoopCast(
    Instruction::CastOps Opcode,
    llvm::Type* SrcTy,
    llvm::Type* DstTy,
    const llvm::DataLayout& DL)

Description

A no-op cast is one that can be effected without changing any bits. It implies that the source and destination types are the same size. The DataLayout argument is to determine the pointer size when examining casts involving Integer and Pointer types. They are no-op casts if the integer is the same size as the pointer. However, pointer size varies with platform. Determine if the described cast is a no-op cast.

Declared at: llvm/include/llvm/IR/InstrTypes.h:662

Parameters

Instruction::CastOps Opcode

llvm::Type* SrcTy

llvm::Type* DstTy

const llvm::DataLayout& DL

¶bool isNoopCast(const llvm::DataLayout& DL) const

Description

Determine if this cast is a no-op cast.

Declared at: llvm/include/llvm/IR/InstrTypes.h:672

Parameters

const llvm::DataLayout& DL

is the DataLayout to determine pointer size.