llvm::CmpInst Class Reference

Abstract base class of comparison instructions. More...

#include <InstrTypes.h>

Inheritance diagram for llvm::CmpInst:

Collaboration diagram for llvm::CmpInst:

List of all members.

Public Types

enum Predicate {
  FCMP_FALSE = 0, FCMP_OEQ = 1, FCMP_OGT = 2, FCMP_OGE = 3,
  FCMP_OLT = 4, FCMP_OLE = 5, FCMP_ONE = 6, FCMP_ORD = 7,
  FCMP_UNO = 8, FCMP_UEQ = 9, FCMP_UGT = 10, FCMP_UGE = 11,
  FCMP_ULT = 12, FCMP_ULE = 13, FCMP_UNE = 14, FCMP_TRUE = 15,
  FIRST_FCMP_PREDICATE = FCMP_FALSE, LAST_FCMP_PREDICATE = FCMP_TRUE, BAD_FCMP_PREDICATE = FCMP_TRUE + 1, ICMP_EQ = 32,
  ICMP_NE = 33, ICMP_UGT = 34, ICMP_UGE = 35, ICMP_ULT = 36,
  ICMP_ULE = 37, ICMP_SGT = 38, ICMP_SGE = 39, ICMP_SLT = 40,
  ICMP_SLE = 41, FIRST_ICMP_PREDICATE = ICMP_EQ, LAST_ICMP_PREDICATE = ICMP_SLE, BAD_ICMP_PREDICATE = ICMP_SLE + 1
}

Public Member Functions

void * operator new (size_t s)

OtherOps getOpcode () const

Get the opcode casted to the right type.

Predicate getPredicate () const

Return the predicate for this instruction.

void setPredicate (Predicate P)

Set the predicate for this instruction to the specified value.

Predicate getInversePredicate () const

Return the inverse of the instruction's predicate.

Predicate getSwappedPredicate () const

Return the predicate as if the operands were swapped.

DECLARE_TRANSPARENT_OPERAND_ACCESSORS (Value)

Provide more efficient getOperand methods.

void swapOperands ()

Swap the operands and adjust predicate accordingly to retain the same comparison.

bool isCommutative ()

Determine if this CmpInst is commutative.

bool isEquality ()

Determine if this is an equals/not equals predicate.

Static Public Member Functions

static CmpInst * Create (OtherOps Op, unsigned short predicate, Value *S1, Value *S2, const std::string &Name="", Instruction *InsertBefore=0)

Create a CmpInst.

static CmpInst * Create (OtherOps Op, unsigned short predicate, Value *S1, Value *S2, const std::string &Name, BasicBlock *InsertAtEnd)

Create a CmpInst.

static Predicate getInversePredicate (Predicate pred)

Return the inverse of a given predicate.

static Predicate getSwappedPredicate (Predicate pred)

Return the predicate as if the operands were swapped.

static bool isUnsigned (unsigned short predicate)

Determine if the predicate is an unsigned operation.

static bool isSigned (unsigned short predicate)

Determine if the predicate is an signed operation.

static bool isOrdered (unsigned short predicate)

Determine if the predicate is an ordered operation.

static bool isUnordered (unsigned short predicate)

Determine if the predicate is an unordered operation.

static bool classof (const CmpInst *)

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

static bool classof (const Instruction *I)

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

static bool classof (const Value *V)

static const Type * makeCmpResultType (const Type *opnd_type)

Create a result type for fcmp/icmp (but not vicmp/vfcmp).

Protected Member Functions

CmpInst (const Type *ty, Instruction::OtherOps op, unsigned short pred, Value *LHS, Value *RHS, const std::string &Name="", Instruction *InsertBefore=0)

CmpInst (const Type *ty, Instruction::OtherOps op, unsigned short pred, Value *LHS, Value *RHS, const std::string &Name, BasicBlock *InsertAtEnd)

Detailed Description

Abstract base class of comparison instructions.

This class is the base class for the comparison instructions.

Definition at line 1085 of file InstrTypes.h.

Member Enumeration Documentation

enum llvm::CmpInst::Predicate

This enumeration lists the possible predicates for CmpInst subclasses. Values in the range 0-31 are reserved for FCmpInst, while values in the range 32-64 are reserved for ICmpInst. This is necessary to ensure the predicate values are not overlapping between the classes.

Enumerator:

FCMP_FALSE
FCMP_OEQ	0 0 0 0 Always false (always folded)
FCMP_OGT	0 0 0 1 True if ordered and equal
FCMP_OGE	0 0 1 0 True if ordered and greater than
FCMP_OLT	0 0 1 1 True if ordered and greater than or equal
FCMP_OLE	0 1 0 0 True if ordered and less than
FCMP_ONE	0 1 0 1 True if ordered and less than or equal
FCMP_ORD	0 1 1 0 True if ordered and operands are unequal
FCMP_UNO	0 1 1 1 True if ordered (no nans)
FCMP_UEQ	1 0 0 0 True if unordered: isnan(X) \| isnan(Y)
FCMP_UGT	1 0 0 1 True if unordered or equal
FCMP_UGE	1 0 1 0 True if unordered or greater than
FCMP_ULT	1 0 1 1 True if unordered, greater than, or equal
FCMP_ULE	1 1 0 0 True if unordered or less than
FCMP_UNE	1 1 0 1 True if unordered, less than, or equal
FCMP_TRUE	1 1 1 0 True if unordered or not equal
FIRST_FCMP_PREDICATE	1 1 1 1 Always true (always folded)
LAST_FCMP_PREDICATE
BAD_FCMP_PREDICATE
ICMP_EQ
ICMP_NE	equal
ICMP_UGT	not equal
ICMP_UGE	unsigned greater than
ICMP_ULT	unsigned greater or equal
ICMP_ULE	unsigned less than
ICMP_SGT	unsigned less or equal
ICMP_SGE	signed greater than
ICMP_SLT	signed greater or equal
ICMP_SLE	signed less than
FIRST_ICMP_PREDICATE	signed less or equal
LAST_ICMP_PREDICATE
BAD_ICMP_PREDICATE

Definition at line 1102 of file InstrTypes.h.

Constructor & Destructor Documentation

CmpInst::CmpInst	(	const Type *	ty,
		Instruction::OtherOps	op,
		unsigned short	pred,
		Value *	LHS,
		Value *	RHS,
		const std::string &	Name = `""`,
		Instruction *	InsertBefore = `0`
	)			`[protected]`

Definition at line 2495 of file Instructions.cpp.

References llvm::Value::setName().

CmpInst::CmpInst	(	const Type *	ty,
		Instruction::OtherOps	op,
		unsigned short	pred,
		Value *	LHS,
		Value *	RHS,
		const std::string &	Name,
		BasicBlock *	InsertAtEnd
	)			`[protected]`

Definition at line 2508 of file Instructions.cpp.

References llvm::Value::setName().

Member Function Documentation

void* llvm::CmpInst::operator new ( size_t s ) [inline]

Reimplemented from llvm::User.

Definition at line 1139 of file InstrTypes.h.

CmpInst * CmpInst::Create	(	OtherOps	Op,
		unsigned short	predicate,
		Value *	S1,
		Value *	S2,
		const std::string &	Name = `""`,
		Instruction *	InsertBefore = `0`
	)			`[static]`

Create a CmpInst.

Construct a compare instruction, given the opcode, the predicate and the two operands. Optionally (if InstBefore is specified) insert the instruction into a BasicBlock right before the specified instruction. The specified Instruction is allowed to be a dereferenced end iterator.

Definition at line 2522 of file Instructions.cpp.

References FCmp, and VICmp.

Referenced by OptimizeCmpExpression().

CmpInst * CmpInst::Create	(	OtherOps	Op,
		unsigned short	predicate,
		Value *	S1,
		Value *	S2,
		const std::string &	Name,
		BasicBlock *	InsertAtEnd
	)			`[static]`

Create a CmpInst.

Construct a compare instruction, given the opcode, the predicate and the two operands. Also automatically insert this instruction to the end of the BasicBlock specified.

Definition at line 2541 of file Instructions.cpp.

References FCmp, and VICmp.

OtherOps llvm::CmpInst::getOpcode ( ) const [inline]

Get the opcode casted to the right type.

Reimplemented from llvm::Instruction.

Definition at line 1160 of file InstrTypes.h.

Referenced by dyn_castFoldableMul(), getOpcode(), and OptimizeCmpExpression().

Predicate llvm::CmpInst::getPredicate ( ) const [inline]

Return the predicate for this instruction.

Reimplemented in llvm::VICmpInst, and llvm::VFCmpInst.

Definition at line 1165 of file InstrTypes.h.

Referenced by llvm::ICmpInst::clone(), llvm::FCmpInst::clone(), getICmpCode(), OptimizeCmpExpression(), OptimizeGlobalAddressOfMalloc(), llvm::Interpreter::visitFCmpInst(), and llvm::Interpreter::visitICmpInst().

void llvm::CmpInst::setPredicate ( Predicate P ) [inline]

Set the predicate for this instruction to the specified value.

Definition at line 1168 of file InstrTypes.h.

Predicate llvm::CmpInst::getInversePredicate ( ) const [inline]

Return the inverse of the instruction's predicate.

For example, EQ -> NE, UGT -> ULE, SLT -> SGE, OEQ -> UNE, UGT -> OLE, OLT -> UGE, etc.

Returns:: the inverse predicate for the instruction's current predicate.

Definition at line 1174 of file InstrTypes.h.

CmpInst::Predicate CmpInst::getInversePredicate ( Predicate pred ) [static]

Return the inverse of a given predicate.

For example, EQ -> NE, UGT -> ULE, SLT -> SGE, OEQ -> UNE, UGT -> OLE, OLT -> UGE, etc.

Returns:: the inverse predicate for predicate provided in pred.

Definition at line 2579 of file Instructions.cpp.

References FCMP_FALSE, FCMP_OEQ, FCMP_OGE, FCMP_OGT, FCMP_OLE, FCMP_OLT, FCMP_ONE, FCMP_ORD, FCMP_TRUE, FCMP_UEQ, FCMP_UGE, FCMP_UGT, FCMP_ULE, FCMP_ULT, FCMP_UNE, FCMP_UNO, ICMP_EQ, ICMP_NE, ICMP_SGE, ICMP_SGT, ICMP_SLE, ICMP_SLT, ICMP_UGE, ICMP_UGT, ICMP_ULE, and ICMP_ULT.

Predicate llvm::CmpInst::getSwappedPredicate ( ) const [inline]

Return the predicate as if the operands were swapped.

For example, EQ->EQ, SLE->SGE, ULT->UGT, OEQ->OEQ, ULE->UGE, OLT->OGT, etc.

Returns:: the predicate that would be the result of exchanging the two operands of the CmpInst instruction without changing the result produced.

Definition at line 1190 of file InstrTypes.h.

Referenced by llvm::ConstantFoldCompareInstruction(), evaluateFCmpRelation(), and evaluateICmpRelation().

CmpInst::Predicate CmpInst::getSwappedPredicate ( Predicate pred ) [static]

Return the predicate as if the operands were swapped.

This is a static version that you can use without an instruction available.

Definition at line 2684 of file Instructions.cpp.

References FCMP_FALSE, FCMP_OEQ, FCMP_OGE, FCMP_OGT, FCMP_OLE, FCMP_OLT, FCMP_ONE, FCMP_ORD, FCMP_TRUE, FCMP_UEQ, FCMP_UGE, FCMP_UGT, FCMP_ULE, FCMP_ULT, FCMP_UNE, FCMP_UNO, ICMP_EQ, ICMP_NE, ICMP_SGE, ICMP_SGT, ICMP_SLE, ICMP_SLT, ICMP_UGE, ICMP_UGT, ICMP_ULE, and ICMP_ULT.

llvm::CmpInst::DECLARE_TRANSPARENT_OPERAND_ACCESSORS ( Value )

Provide more efficient getOperand methods.

void CmpInst::swapOperands ( )

Swap the operands and adjust predicate accordingly to retain the same comparison.

This is just a convenience that dispatches to the subclasses.

Reimplemented in llvm::ICmpInst, and llvm::FCmpInst.

Definition at line 2559 of file Instructions.cpp.

References IC.

bool CmpInst::isCommutative ( )

Determine if this CmpInst is commutative.

This is just a convenience that dispatches to the subclasses.

Definition at line 2566 of file Instructions.cpp.

References IC.

bool CmpInst::isEquality ( )

Determine if this is an equals/not equals predicate.

This is just a convenience that dispatches to the subclasses.

Definition at line 2572 of file Instructions.cpp.

References IC.

bool CmpInst::isUnsigned ( unsigned short predicate ) [static]

Determine if the predicate is an unsigned operation.

Returns:: true if the predicate is unsigned, false otherwise.

Definition at line 2714 of file Instructions.cpp.

References ICMP_UGE, ICMP_UGT, ICMP_ULE, and ICMP_ULT.

bool CmpInst::isSigned ( unsigned short predicate ) [static]

Determine if the predicate is an signed operation.

Returns:: true if the predicate is signed, false otherwise.

Definition at line 2722 of file Instructions.cpp.

References ICMP_SGE, ICMP_SGT, ICMP_SLE, and ICMP_SLT.

Referenced by llvm::ConstantFoldCompareInstruction().

bool CmpInst::isOrdered ( unsigned short predicate ) [static]

Determine if the predicate is an ordered operation.

Definition at line 2730 of file Instructions.cpp.

References FCMP_OEQ, FCMP_OGE, FCMP_OGT, FCMP_OLE, FCMP_OLT, FCMP_ONE, and FCMP_ORD.

bool CmpInst::isUnordered ( unsigned short predicate ) [static]

Determine if the predicate is an unordered operation.

Definition at line 2739 of file Instructions.cpp.

References FCMP_UEQ, FCMP_UGE, FCMP_UGT, FCMP_ULE, FCMP_ULT, FCMP_UNE, and FCMP_UNO.

static bool llvm::CmpInst::classof ( const CmpInst * ) [inline, static]

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

Definition at line 1230 of file InstrTypes.h.

static bool llvm::CmpInst::classof ( const Instruction * ) [inline, static]

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

Reimplemented from llvm::Instruction.

Reimplemented in llvm::ICmpInst, llvm::FCmpInst, llvm::VICmpInst, and llvm::VFCmpInst.

Definition at line 1231 of file InstrTypes.h.

static bool llvm::CmpInst::classof ( const Value * V ) [inline, static]

Reimplemented from llvm::Instruction.

Reimplemented in llvm::ICmpInst, llvm::FCmpInst, llvm::VICmpInst, and llvm::VFCmpInst.

Definition at line 1237 of file InstrTypes.h.

static const Type* llvm::CmpInst::makeCmpResultType ( const Type * opnd_type ) [inline, static]

Create a result type for fcmp/icmp (but not vicmp/vfcmp).

Definition at line 1241 of file InstrTypes.h.

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


Public Types
enum	Predicate { FCMP_FALSE = 0, FCMP_OEQ = 1, FCMP_OGT = 2, FCMP_OGE = 3, FCMP_OLT = 4, FCMP_OLE = 5, FCMP_ONE = 6, FCMP_ORD = 7, FCMP_UNO = 8, FCMP_UEQ = 9, FCMP_UGT = 10, FCMP_UGE = 11, FCMP_ULT = 12, FCMP_ULE = 13, FCMP_UNE = 14, FCMP_TRUE = 15, FIRST_FCMP_PREDICATE = FCMP_FALSE, LAST_FCMP_PREDICATE = FCMP_TRUE, BAD_FCMP_PREDICATE = FCMP_TRUE + 1, ICMP_EQ = 32, ICMP_NE = 33, ICMP_UGT = 34, ICMP_UGE = 35, ICMP_ULT = 36, ICMP_ULE = 37, ICMP_SGT = 38, ICMP_SGE = 39, ICMP_SLT = 40, ICMP_SLE = 41, FIRST_ICMP_PREDICATE = ICMP_EQ, LAST_ICMP_PREDICATE = ICMP_SLE, BAD_ICMP_PREDICATE = ICMP_SLE + 1 }
Public Member Functions
void *	operator new (size_t s)
OtherOps	getOpcode () const
	Get the opcode casted to the right type.
Predicate	getPredicate () const
	Return the predicate for this instruction.
void	setPredicate (Predicate P)
	Set the predicate for this instruction to the specified value.
Predicate	getInversePredicate () const
	Return the inverse of the instruction's predicate.
Predicate	getSwappedPredicate () const
	Return the predicate as if the operands were swapped.
	DECLARE_TRANSPARENT_OPERAND_ACCESSORS (Value)
	Provide more efficient getOperand methods.
void	swapOperands ()
	Swap the operands and adjust predicate accordingly to retain the same comparison.
bool	isCommutative ()
	Determine if this CmpInst is commutative.
bool	isEquality ()
	Determine if this is an equals/not equals predicate.
Static Public Member Functions
static CmpInst *	Create (OtherOps Op, unsigned short predicate, Value S1, Value S2, const std::string &Name="", Instruction *InsertBefore=0)
	Create a CmpInst.
static CmpInst *	Create (OtherOps Op, unsigned short predicate, Value S1, Value S2, const std::string &Name, BasicBlock *InsertAtEnd)
	Create a CmpInst.
static Predicate	getInversePredicate (Predicate pred)
	Return the inverse of a given predicate.
static Predicate	getSwappedPredicate (Predicate pred)
	Return the predicate as if the operands were swapped.
static bool	isUnsigned (unsigned short predicate)
	Determine if the predicate is an unsigned operation.
static bool	isSigned (unsigned short predicate)
	Determine if the predicate is an signed operation.
static bool	isOrdered (unsigned short predicate)
	Determine if the predicate is an ordered operation.
static bool	isUnordered (unsigned short predicate)
	Determine if the predicate is an unordered operation.
static bool	classof (const CmpInst *)
	Methods for support type inquiry through isa, cast, and dyn_cast:.
static bool	classof (const Instruction *I)
	Methods for support type inquiry through isa, cast, and dyn_cast:.
static bool	classof (const Value *V)
static const Type *	makeCmpResultType (const Type *opnd_type)
	Create a result type for fcmp/icmp (but not vicmp/vfcmp).
Protected Member Functions
	CmpInst (const Type ty, Instruction::OtherOps op, unsigned short pred, Value LHS, Value RHS, const std::string &Name="", Instruction InsertBefore=0)
	CmpInst (const Type ty, Instruction::OtherOps op, unsigned short pred, Value LHS, Value RHS, const std::string &Name, BasicBlock InsertAtEnd)