1 //===-- llvm/InstrTypes.h - Important Instruction subclasses ----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines various meta classes of instructions that exist in the VM
11 // representation. Specific concrete subclasses of these may be found in the
14 //===----------------------------------------------------------------------===//
16 #ifndef LLVM_INSTRUCTION_TYPES_H
17 #define LLVM_INSTRUCTION_TYPES_H
19 #include "llvm/Instruction.h"
20 #include "llvm/OperandTraits.h"
21 #include "llvm/Operator.h"
22 #include "llvm/DerivedTypes.h"
28 //===----------------------------------------------------------------------===//
29 // TerminatorInst Class
30 //===----------------------------------------------------------------------===//
32 /// TerminatorInst - Subclasses of this class are all able to terminate a basic
33 /// block. Thus, these are all the flow control type of operations.
35 class TerminatorInst : public Instruction {
37 TerminatorInst(const Type *Ty, Instruction::TermOps iType,
38 Use *Ops, unsigned NumOps,
39 Instruction *InsertBefore = 0)
40 : Instruction(Ty, iType, Ops, NumOps, InsertBefore) {}
42 TerminatorInst(const Type *Ty, Instruction::TermOps iType,
43 Use *Ops, unsigned NumOps, BasicBlock *InsertAtEnd)
44 : Instruction(Ty, iType, Ops, NumOps, InsertAtEnd) {}
46 // Out of line virtual method, so the vtable, etc has a home.
49 /// Virtual methods - Terminators should overload these and provide inline
50 /// overrides of non-V methods.
51 virtual BasicBlock *getSuccessorV(unsigned idx) const = 0;
52 virtual unsigned getNumSuccessorsV() const = 0;
53 virtual void setSuccessorV(unsigned idx, BasicBlock *B) = 0;
56 virtual TerminatorInst *clone() const = 0;
58 /// getNumSuccessors - Return the number of successors that this terminator
60 unsigned getNumSuccessors() const {
61 return getNumSuccessorsV();
64 /// getSuccessor - Return the specified successor.
66 BasicBlock *getSuccessor(unsigned idx) const {
67 return getSuccessorV(idx);
70 /// setSuccessor - Update the specified successor to point at the provided
72 void setSuccessor(unsigned idx, BasicBlock *B) {
73 setSuccessorV(idx, B);
76 // Methods for support type inquiry through isa, cast, and dyn_cast:
77 static inline bool classof(const TerminatorInst *) { return true; }
78 static inline bool classof(const Instruction *I) {
79 return I->isTerminator();
81 static inline bool classof(const Value *V) {
82 return isa<Instruction>(V) && classof(cast<Instruction>(V));
87 //===----------------------------------------------------------------------===//
88 // UnaryInstruction Class
89 //===----------------------------------------------------------------------===//
91 class UnaryInstruction : public Instruction {
92 void *operator new(size_t, unsigned); // Do not implement
95 UnaryInstruction(const Type *Ty, unsigned iType, Value *V,
97 : Instruction(Ty, iType, &Op<0>(), 1, IB) {
100 UnaryInstruction(const Type *Ty, unsigned iType, Value *V, BasicBlock *IAE)
101 : Instruction(Ty, iType, &Op<0>(), 1, IAE) {
105 // allocate space for exactly one operand
106 void *operator new(size_t s) {
107 return User::operator new(s, 1);
110 // Out of line virtual method, so the vtable, etc has a home.
113 /// Transparently provide more efficient getOperand methods.
114 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
116 // Methods for support type inquiry through isa, cast, and dyn_cast:
117 static inline bool classof(const UnaryInstruction *) { return true; }
118 static inline bool classof(const Instruction *I) {
119 return I->getOpcode() == Instruction::Malloc ||
120 I->getOpcode() == Instruction::Alloca ||
121 I->getOpcode() == Instruction::Free ||
122 I->getOpcode() == Instruction::Load ||
123 I->getOpcode() == Instruction::VAArg ||
124 I->getOpcode() == Instruction::ExtractValue ||
125 (I->getOpcode() >= CastOpsBegin && I->getOpcode() < CastOpsEnd);
127 static inline bool classof(const Value *V) {
128 return isa<Instruction>(V) && classof(cast<Instruction>(V));
133 struct OperandTraits<UnaryInstruction> : public FixedNumOperandTraits<1> {
136 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(UnaryInstruction, Value)
138 //===----------------------------------------------------------------------===//
139 // BinaryOperator Class
140 //===----------------------------------------------------------------------===//
142 class BinaryOperator : public Instruction {
143 void *operator new(size_t, unsigned); // Do not implement
145 void init(BinaryOps iType);
146 BinaryOperator(BinaryOps iType, Value *S1, Value *S2, const Type *Ty,
147 const Twine &Name, Instruction *InsertBefore);
148 BinaryOperator(BinaryOps iType, Value *S1, Value *S2, const Type *Ty,
149 const Twine &Name, BasicBlock *InsertAtEnd);
151 // allocate space for exactly two operands
152 void *operator new(size_t s) {
153 return User::operator new(s, 2);
156 /// Transparently provide more efficient getOperand methods.
157 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
159 /// Create() - Construct a binary instruction, given the opcode and the two
160 /// operands. Optionally (if InstBefore is specified) insert the instruction
161 /// into a BasicBlock right before the specified instruction. The specified
162 /// Instruction is allowed to be a dereferenced end iterator.
164 static BinaryOperator *Create(BinaryOps Op, Value *S1, Value *S2,
165 const Twine &Name = "",
166 Instruction *InsertBefore = 0);
168 /// Create() - Construct a binary instruction, given the opcode and the two
169 /// operands. Also automatically insert this instruction to the end of the
170 /// BasicBlock specified.
172 static BinaryOperator *Create(BinaryOps Op, Value *S1, Value *S2,
173 const Twine &Name, BasicBlock *InsertAtEnd);
175 /// Create* - These methods just forward to Create, and are useful when you
176 /// statically know what type of instruction you're going to create. These
177 /// helpers just save some typing.
178 #define HANDLE_BINARY_INST(N, OPC, CLASS) \
179 static BinaryOperator *Create##OPC(Value *V1, Value *V2, \
180 const Twine &Name = "") {\
181 return Create(Instruction::OPC, V1, V2, Name);\
183 #include "llvm/Instruction.def"
184 #define HANDLE_BINARY_INST(N, OPC, CLASS) \
185 static BinaryOperator *Create##OPC(Value *V1, Value *V2, \
186 const Twine &Name, BasicBlock *BB) {\
187 return Create(Instruction::OPC, V1, V2, Name, BB);\
189 #include "llvm/Instruction.def"
190 #define HANDLE_BINARY_INST(N, OPC, CLASS) \
191 static BinaryOperator *Create##OPC(Value *V1, Value *V2, \
192 const Twine &Name, Instruction *I) {\
193 return Create(Instruction::OPC, V1, V2, Name, I);\
195 #include "llvm/Instruction.def"
198 /// CreateNSWAdd - Create an Add operator with the NSW flag set.
200 static BinaryOperator *CreateNSWAdd(Value *V1, Value *V2,
201 const Twine &Name = "") {
202 BinaryOperator *BO = CreateAdd(V1, V2, Name);
203 BO->setHasNoSignedWrap(true);
206 static BinaryOperator *CreateNSWAdd(Value *V1, Value *V2,
207 const Twine &Name, BasicBlock *BB) {
208 BinaryOperator *BO = CreateAdd(V1, V2, Name, BB);
209 BO->setHasNoSignedWrap(true);
212 static BinaryOperator *CreateNSWAdd(Value *V1, Value *V2,
213 const Twine &Name, Instruction *I) {
214 BinaryOperator *BO = CreateAdd(V1, V2, Name, I);
215 BO->setHasNoSignedWrap(true);
219 /// CreateNSWSub - Create an Sub operator with the NSW flag set.
221 static BinaryOperator *CreateNSWSub(Value *V1, Value *V2,
222 const Twine &Name = "") {
223 BinaryOperator *BO = CreateSub(V1, V2, Name);
224 BO->setHasNoSignedWrap(true);
227 static BinaryOperator *CreateNSWSub(Value *V1, Value *V2,
228 const Twine &Name, BasicBlock *BB) {
229 BinaryOperator *BO = CreateSub(V1, V2, Name, BB);
230 BO->setHasNoSignedWrap(true);
233 static BinaryOperator *CreateNSWSub(Value *V1, Value *V2,
234 const Twine &Name, Instruction *I) {
235 BinaryOperator *BO = CreateSub(V1, V2, Name, I);
236 BO->setHasNoSignedWrap(true);
240 /// CreateExactSDiv - Create an SDiv operator with the exact flag set.
242 static BinaryOperator *CreateExactSDiv(Value *V1, Value *V2,
243 const Twine &Name = "") {
244 BinaryOperator *BO = CreateSDiv(V1, V2, Name);
245 BO->setIsExact(true);
248 static BinaryOperator *CreateExactSDiv(Value *V1, Value *V2,
249 const Twine &Name, BasicBlock *BB) {
250 BinaryOperator *BO = CreateSDiv(V1, V2, Name, BB);
251 BO->setIsExact(true);
254 static BinaryOperator *CreateExactSDiv(Value *V1, Value *V2,
255 const Twine &Name, Instruction *I) {
256 BinaryOperator *BO = CreateSDiv(V1, V2, Name, I);
257 BO->setIsExact(true);
261 /// Helper functions to construct and inspect unary operations (NEG and NOT)
262 /// via binary operators SUB and XOR:
264 /// CreateNeg, CreateNot - Create the NEG and NOT
265 /// instructions out of SUB and XOR instructions.
267 static BinaryOperator *CreateNeg(Value *Op, const Twine &Name = "",
268 Instruction *InsertBefore = 0);
269 static BinaryOperator *CreateNeg(Value *Op, const Twine &Name,
270 BasicBlock *InsertAtEnd);
271 static BinaryOperator *CreateFNeg(Value *Op, const Twine &Name = "",
272 Instruction *InsertBefore = 0);
273 static BinaryOperator *CreateFNeg(Value *Op, const Twine &Name,
274 BasicBlock *InsertAtEnd);
275 static BinaryOperator *CreateNot(Value *Op, const Twine &Name = "",
276 Instruction *InsertBefore = 0);
277 static BinaryOperator *CreateNot(Value *Op, const Twine &Name,
278 BasicBlock *InsertAtEnd);
280 /// isNeg, isFNeg, isNot - Check if the given Value is a
281 /// NEG, FNeg, or NOT instruction.
283 static bool isNeg(const Value *V);
284 static bool isFNeg(const Value *V);
285 static bool isNot(const Value *V);
287 /// getNegArgument, getNotArgument - Helper functions to extract the
288 /// unary argument of a NEG, FNEG or NOT operation implemented via
289 /// Sub, FSub, or Xor.
291 static const Value *getNegArgument(const Value *BinOp);
292 static Value *getNegArgument( Value *BinOp);
293 static const Value *getFNegArgument(const Value *BinOp);
294 static Value *getFNegArgument( Value *BinOp);
295 static const Value *getNotArgument(const Value *BinOp);
296 static Value *getNotArgument( Value *BinOp);
298 BinaryOps getOpcode() const {
299 return static_cast<BinaryOps>(Instruction::getOpcode());
302 virtual BinaryOperator *clone() const;
304 /// swapOperands - Exchange the two operands to this instruction.
305 /// This instruction is safe to use on any binary instruction and
306 /// does not modify the semantics of the instruction. If the instruction
307 /// cannot be reversed (ie, it's a Div), then return true.
311 /// setHasNoUnsignedWrap - Set or clear the nsw flag on this instruction,
312 /// which must be an operator which supports this flag. See LangRef.html
313 /// for the meaning of this flag.
314 void setHasNoUnsignedWrap(bool);
316 /// setHasNoSignedWrap - Set or clear the nsw flag on this instruction,
317 /// which must be an operator which supports this flag. See LangRef.html
318 /// for the meaning of this flag.
319 void setHasNoSignedWrap(bool);
321 /// setIsExact - Set or clear the exact flag on this instruction,
322 /// which must be an operator which supports this flag. See LangRef.html
323 /// for the meaning of this flag.
324 void setIsExact(bool);
326 // Methods for support type inquiry through isa, cast, and dyn_cast:
327 static inline bool classof(const BinaryOperator *) { return true; }
328 static inline bool classof(const Instruction *I) {
329 return I->isBinaryOp();
331 static inline bool classof(const Value *V) {
332 return isa<Instruction>(V) && classof(cast<Instruction>(V));
337 struct OperandTraits<BinaryOperator> : public FixedNumOperandTraits<2> {
340 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(BinaryOperator, Value)
342 //===----------------------------------------------------------------------===//
344 //===----------------------------------------------------------------------===//
346 /// CastInst - This is the base class for all instructions that perform data
347 /// casts. It is simply provided so that instruction category testing
348 /// can be performed with code like:
350 /// if (isa<CastInst>(Instr)) { ... }
351 /// @brief Base class of casting instructions.
352 class CastInst : public UnaryInstruction {
354 /// @brief Constructor with insert-before-instruction semantics for subclasses
355 CastInst(const Type *Ty, unsigned iType, Value *S,
356 const Twine &NameStr = "", Instruction *InsertBefore = 0)
357 : UnaryInstruction(Ty, iType, S, InsertBefore) {
360 /// @brief Constructor with insert-at-end-of-block semantics for subclasses
361 CastInst(const Type *Ty, unsigned iType, Value *S,
362 const Twine &NameStr, BasicBlock *InsertAtEnd)
363 : UnaryInstruction(Ty, iType, S, InsertAtEnd) {
367 /// Provides a way to construct any of the CastInst subclasses using an
368 /// opcode instead of the subclass's constructor. The opcode must be in the
369 /// CastOps category (Instruction::isCast(opcode) returns true). This
370 /// constructor has insert-before-instruction semantics to automatically
371 /// insert the new CastInst before InsertBefore (if it is non-null).
372 /// @brief Construct any of the CastInst subclasses
373 static CastInst *Create(
374 Instruction::CastOps, ///< The opcode of the cast instruction
375 Value *S, ///< The value to be casted (operand 0)
376 const Type *Ty, ///< The type to which cast should be made
377 const Twine &Name = "", ///< Name for the instruction
378 Instruction *InsertBefore = 0 ///< Place to insert the instruction
380 /// Provides a way to construct any of the CastInst subclasses using an
381 /// opcode instead of the subclass's constructor. The opcode must be in the
382 /// CastOps category. This constructor has insert-at-end-of-block semantics
383 /// to automatically insert the new CastInst at the end of InsertAtEnd (if
385 /// @brief Construct any of the CastInst subclasses
386 static CastInst *Create(
387 Instruction::CastOps, ///< The opcode for the cast instruction
388 Value *S, ///< The value to be casted (operand 0)
389 const Type *Ty, ///< The type to which operand is casted
390 const Twine &Name, ///< The name for the instruction
391 BasicBlock *InsertAtEnd ///< The block to insert the instruction into
394 /// @brief Create a ZExt or BitCast cast instruction
395 static CastInst *CreateZExtOrBitCast(
396 Value *S, ///< The value to be casted (operand 0)
397 const Type *Ty, ///< The type to which cast should be made
398 const Twine &Name = "", ///< Name for the instruction
399 Instruction *InsertBefore = 0 ///< Place to insert the instruction
402 /// @brief Create a ZExt or BitCast cast instruction
403 static CastInst *CreateZExtOrBitCast(
404 Value *S, ///< The value to be casted (operand 0)
405 const Type *Ty, ///< The type to which operand is casted
406 const Twine &Name, ///< The name for the instruction
407 BasicBlock *InsertAtEnd ///< The block to insert the instruction into
410 /// @brief Create a SExt or BitCast cast instruction
411 static CastInst *CreateSExtOrBitCast(
412 Value *S, ///< The value to be casted (operand 0)
413 const Type *Ty, ///< The type to which cast should be made
414 const Twine &Name = "", ///< Name for the instruction
415 Instruction *InsertBefore = 0 ///< Place to insert the instruction
418 /// @brief Create a SExt or BitCast cast instruction
419 static CastInst *CreateSExtOrBitCast(
420 Value *S, ///< The value to be casted (operand 0)
421 const Type *Ty, ///< The type to which operand is casted
422 const Twine &Name, ///< The name for the instruction
423 BasicBlock *InsertAtEnd ///< The block to insert the instruction into
426 /// @brief Create a BitCast or a PtrToInt cast instruction
427 static CastInst *CreatePointerCast(
428 Value *S, ///< The pointer value to be casted (operand 0)
429 const Type *Ty, ///< The type to which operand is casted
430 const Twine &Name, ///< The name for the instruction
431 BasicBlock *InsertAtEnd ///< The block to insert the instruction into
434 /// @brief Create a BitCast or a PtrToInt cast instruction
435 static CastInst *CreatePointerCast(
436 Value *S, ///< The pointer value to be casted (operand 0)
437 const Type *Ty, ///< The type to which cast should be made
438 const Twine &Name = "", ///< Name for the instruction
439 Instruction *InsertBefore = 0 ///< Place to insert the instruction
442 /// @brief Create a ZExt, BitCast, or Trunc for int -> int casts.
443 static CastInst *CreateIntegerCast(
444 Value *S, ///< The pointer value to be casted (operand 0)
445 const Type *Ty, ///< The type to which cast should be made
446 bool isSigned, ///< Whether to regard S as signed or not
447 const Twine &Name = "", ///< Name for the instruction
448 Instruction *InsertBefore = 0 ///< Place to insert the instruction
451 /// @brief Create a ZExt, BitCast, or Trunc for int -> int casts.
452 static CastInst *CreateIntegerCast(
453 Value *S, ///< The integer value to be casted (operand 0)
454 const Type *Ty, ///< The integer type to which operand is casted
455 bool isSigned, ///< Whether to regard S as signed or not
456 const Twine &Name, ///< The name for the instruction
457 BasicBlock *InsertAtEnd ///< The block to insert the instruction into
460 /// @brief Create an FPExt, BitCast, or FPTrunc for fp -> fp casts
461 static CastInst *CreateFPCast(
462 Value *S, ///< The floating point value to be casted
463 const Type *Ty, ///< The floating point type to cast to
464 const Twine &Name = "", ///< Name for the instruction
465 Instruction *InsertBefore = 0 ///< Place to insert the instruction
468 /// @brief Create an FPExt, BitCast, or FPTrunc for fp -> fp casts
469 static CastInst *CreateFPCast(
470 Value *S, ///< The floating point value to be casted
471 const Type *Ty, ///< The floating point type to cast to
472 const Twine &Name, ///< The name for the instruction
473 BasicBlock *InsertAtEnd ///< The block to insert the instruction into
476 /// @brief Create a Trunc or BitCast cast instruction
477 static CastInst *CreateTruncOrBitCast(
478 Value *S, ///< The value to be casted (operand 0)
479 const Type *Ty, ///< The type to which cast should be made
480 const Twine &Name = "", ///< Name for the instruction
481 Instruction *InsertBefore = 0 ///< Place to insert the instruction
484 /// @brief Create a Trunc or BitCast cast instruction
485 static CastInst *CreateTruncOrBitCast(
486 Value *S, ///< The value to be casted (operand 0)
487 const Type *Ty, ///< The type to which operand is casted
488 const Twine &Name, ///< The name for the instruction
489 BasicBlock *InsertAtEnd ///< The block to insert the instruction into
492 /// @brief Check whether it is valid to call getCastOpcode for these types.
493 static bool isCastable(
494 const Type *SrcTy, ///< The Type from which the value should be cast.
495 const Type *DestTy ///< The Type to which the value should be cast.
498 /// Returns the opcode necessary to cast Val into Ty using usual casting
500 /// @brief Infer the opcode for cast operand and type
501 static Instruction::CastOps getCastOpcode(
502 const Value *Val, ///< The value to cast
503 bool SrcIsSigned, ///< Whether to treat the source as signed
504 const Type *Ty, ///< The Type to which the value should be casted
505 bool DstIsSigned ///< Whether to treate the dest. as signed
508 /// There are several places where we need to know if a cast instruction
509 /// only deals with integer source and destination types. To simplify that
510 /// logic, this method is provided.
511 /// @returns true iff the cast has only integral typed operand and dest type.
512 /// @brief Determine if this is an integer-only cast.
513 bool isIntegerCast() const;
515 /// A lossless cast is one that does not alter the basic value. It implies
516 /// a no-op cast but is more stringent, preventing things like int->float,
517 /// long->double, int->ptr, or vector->anything.
518 /// @returns true iff the cast is lossless.
519 /// @brief Determine if this is a lossless cast.
520 bool isLosslessCast() const;
522 /// A no-op cast is one that can be effected without changing any bits.
523 /// It implies that the source and destination types are the same size. The
524 /// IntPtrTy argument is used to make accurate determinations for casts
525 /// involving Integer and Pointer types. They are no-op casts if the integer
526 /// is the same size as the pointer. However, pointer size varies with
527 /// platform. Generally, the result of TargetData::getIntPtrType() should be
528 /// passed in. If that's not available, use Type::Int64Ty, which will make
529 /// the isNoopCast call conservative.
530 /// @brief Determine if this cast is a no-op cast.
532 const Type *IntPtrTy ///< Integer type corresponding to pointer
535 /// Determine how a pair of casts can be eliminated, if they can be at all.
536 /// This is a helper function for both CastInst and ConstantExpr.
537 /// @returns 0 if the CastInst pair can't be eliminated
538 /// @returns Instruction::CastOps value for a cast that can replace
539 /// the pair, casting SrcTy to DstTy.
540 /// @brief Determine if a cast pair is eliminable
541 static unsigned isEliminableCastPair(
542 Instruction::CastOps firstOpcode, ///< Opcode of first cast
543 Instruction::CastOps secondOpcode, ///< Opcode of second cast
544 const Type *SrcTy, ///< SrcTy of 1st cast
545 const Type *MidTy, ///< DstTy of 1st cast & SrcTy of 2nd cast
546 const Type *DstTy, ///< DstTy of 2nd cast
547 const Type *IntPtrTy ///< Integer type corresponding to Ptr types, or null
550 /// @brief Return the opcode of this CastInst
551 Instruction::CastOps getOpcode() const {
552 return Instruction::CastOps(Instruction::getOpcode());
555 /// @brief Return the source type, as a convenience
556 const Type* getSrcTy() const { return getOperand(0)->getType(); }
557 /// @brief Return the destination type, as a convenience
558 const Type* getDestTy() const { return getType(); }
560 /// This method can be used to determine if a cast from S to DstTy using
561 /// Opcode op is valid or not.
562 /// @returns true iff the proposed cast is valid.
563 /// @brief Determine if a cast is valid without creating one.
564 static bool castIsValid(Instruction::CastOps op, Value *S, const Type *DstTy);
566 /// @brief Methods for support type inquiry through isa, cast, and dyn_cast:
567 static inline bool classof(const CastInst *) { return true; }
568 static inline bool classof(const Instruction *I) {
571 static inline bool classof(const Value *V) {
572 return isa<Instruction>(V) && classof(cast<Instruction>(V));
576 //===----------------------------------------------------------------------===//
578 //===----------------------------------------------------------------------===//
580 /// This class is the base class for the comparison instructions.
581 /// @brief Abstract base class of comparison instructions.
582 // FIXME: why not derive from BinaryOperator?
583 class CmpInst: public Instruction {
584 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
585 CmpInst(); // do not implement
587 CmpInst(const Type *ty, Instruction::OtherOps op, unsigned short pred,
588 Value *LHS, Value *RHS, const Twine &Name = "",
589 Instruction *InsertBefore = 0);
591 CmpInst(const Type *ty, Instruction::OtherOps op, unsigned short pred,
592 Value *LHS, Value *RHS, const Twine &Name,
593 BasicBlock *InsertAtEnd);
596 /// This enumeration lists the possible predicates for CmpInst subclasses.
597 /// Values in the range 0-31 are reserved for FCmpInst, while values in the
598 /// range 32-64 are reserved for ICmpInst. This is necessary to ensure the
599 /// predicate values are not overlapping between the classes.
601 // Opcode U L G E Intuitive operation
602 FCMP_FALSE = 0, /// 0 0 0 0 Always false (always folded)
603 FCMP_OEQ = 1, /// 0 0 0 1 True if ordered and equal
604 FCMP_OGT = 2, /// 0 0 1 0 True if ordered and greater than
605 FCMP_OGE = 3, /// 0 0 1 1 True if ordered and greater than or equal
606 FCMP_OLT = 4, /// 0 1 0 0 True if ordered and less than
607 FCMP_OLE = 5, /// 0 1 0 1 True if ordered and less than or equal
608 FCMP_ONE = 6, /// 0 1 1 0 True if ordered and operands are unequal
609 FCMP_ORD = 7, /// 0 1 1 1 True if ordered (no nans)
610 FCMP_UNO = 8, /// 1 0 0 0 True if unordered: isnan(X) | isnan(Y)
611 FCMP_UEQ = 9, /// 1 0 0 1 True if unordered or equal
612 FCMP_UGT = 10, /// 1 0 1 0 True if unordered or greater than
613 FCMP_UGE = 11, /// 1 0 1 1 True if unordered, greater than, or equal
614 FCMP_ULT = 12, /// 1 1 0 0 True if unordered or less than
615 FCMP_ULE = 13, /// 1 1 0 1 True if unordered, less than, or equal
616 FCMP_UNE = 14, /// 1 1 1 0 True if unordered or not equal
617 FCMP_TRUE = 15, /// 1 1 1 1 Always true (always folded)
618 FIRST_FCMP_PREDICATE = FCMP_FALSE,
619 LAST_FCMP_PREDICATE = FCMP_TRUE,
620 BAD_FCMP_PREDICATE = FCMP_TRUE + 1,
621 ICMP_EQ = 32, /// equal
622 ICMP_NE = 33, /// not equal
623 ICMP_UGT = 34, /// unsigned greater than
624 ICMP_UGE = 35, /// unsigned greater or equal
625 ICMP_ULT = 36, /// unsigned less than
626 ICMP_ULE = 37, /// unsigned less or equal
627 ICMP_SGT = 38, /// signed greater than
628 ICMP_SGE = 39, /// signed greater or equal
629 ICMP_SLT = 40, /// signed less than
630 ICMP_SLE = 41, /// signed less or equal
631 FIRST_ICMP_PREDICATE = ICMP_EQ,
632 LAST_ICMP_PREDICATE = ICMP_SLE,
633 BAD_ICMP_PREDICATE = ICMP_SLE + 1
636 // allocate space for exactly two operands
637 void *operator new(size_t s) {
638 return User::operator new(s, 2);
640 /// Construct a compare instruction, given the opcode, the predicate and
641 /// the two operands. Optionally (if InstBefore is specified) insert the
642 /// instruction into a BasicBlock right before the specified instruction.
643 /// The specified Instruction is allowed to be a dereferenced end iterator.
644 /// @brief Create a CmpInst
645 static CmpInst *Create(OtherOps Op,
646 unsigned short predicate, Value *S1,
647 Value *S2, const Twine &Name = "",
648 Instruction *InsertBefore = 0);
650 /// Construct a compare instruction, given the opcode, the predicate and the
651 /// two operands. Also automatically insert this instruction to the end of
652 /// the BasicBlock specified.
653 /// @brief Create a CmpInst
654 static CmpInst *Create(OtherOps Op, unsigned short predicate, Value *S1,
655 Value *S2, const Twine &Name, BasicBlock *InsertAtEnd);
657 /// @brief Get the opcode casted to the right type
658 OtherOps getOpcode() const {
659 return static_cast<OtherOps>(Instruction::getOpcode());
662 /// @brief Return the predicate for this instruction.
663 Predicate getPredicate() const { return Predicate(SubclassData); }
665 /// @brief Set the predicate for this instruction to the specified value.
666 void setPredicate(Predicate P) { SubclassData = P; }
668 /// For example, EQ -> NE, UGT -> ULE, SLT -> SGE,
669 /// OEQ -> UNE, UGT -> OLE, OLT -> UGE, etc.
670 /// @returns the inverse predicate for the instruction's current predicate.
671 /// @brief Return the inverse of the instruction's predicate.
672 Predicate getInversePredicate() const {
673 return getInversePredicate(getPredicate());
676 /// For example, EQ -> NE, UGT -> ULE, SLT -> SGE,
677 /// OEQ -> UNE, UGT -> OLE, OLT -> UGE, etc.
678 /// @returns the inverse predicate for predicate provided in \p pred.
679 /// @brief Return the inverse of a given predicate
680 static Predicate getInversePredicate(Predicate pred);
682 /// For example, EQ->EQ, SLE->SGE, ULT->UGT,
683 /// OEQ->OEQ, ULE->UGE, OLT->OGT, etc.
684 /// @returns the predicate that would be the result of exchanging the two
685 /// operands of the CmpInst instruction without changing the result
687 /// @brief Return the predicate as if the operands were swapped
688 Predicate getSwappedPredicate() const {
689 return getSwappedPredicate(getPredicate());
692 /// This is a static version that you can use without an instruction
694 /// @brief Return the predicate as if the operands were swapped.
695 static Predicate getSwappedPredicate(Predicate pred);
697 /// @brief Provide more efficient getOperand methods.
698 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
700 /// This is just a convenience that dispatches to the subclasses.
701 /// @brief Swap the operands and adjust predicate accordingly to retain
702 /// the same comparison.
705 /// This is just a convenience that dispatches to the subclasses.
706 /// @brief Determine if this CmpInst is commutative.
707 bool isCommutative();
709 /// This is just a convenience that dispatches to the subclasses.
710 /// @brief Determine if this is an equals/not equals predicate.
713 /// @returns true if the predicate is unsigned, false otherwise.
714 /// @brief Determine if the predicate is an unsigned operation.
715 static bool isUnsigned(unsigned short predicate);
717 /// @returns true if the predicate is signed, false otherwise.
718 /// @brief Determine if the predicate is an signed operation.
719 static bool isSigned(unsigned short predicate);
721 /// @brief Determine if the predicate is an ordered operation.
722 static bool isOrdered(unsigned short predicate);
724 /// @brief Determine if the predicate is an unordered operation.
725 static bool isUnordered(unsigned short predicate);
727 /// @brief Methods for support type inquiry through isa, cast, and dyn_cast:
728 static inline bool classof(const CmpInst *) { return true; }
729 static inline bool classof(const Instruction *I) {
730 return I->getOpcode() == Instruction::ICmp ||
731 I->getOpcode() == Instruction::FCmp;
733 static inline bool classof(const Value *V) {
734 return isa<Instruction>(V) && classof(cast<Instruction>(V));
737 /// @brief Create a result type for fcmp/icmp
738 static const Type* makeCmpResultType(const Type* opnd_type) {
739 if (const VectorType* vt = dyn_cast<const VectorType>(opnd_type)) {
740 return VectorType::get(Type::getInt1Ty(opnd_type->getContext()),
741 vt->getNumElements());
743 return Type::getInt1Ty(opnd_type->getContext());
748 // FIXME: these are redundant if CmpInst < BinaryOperator
750 struct OperandTraits<CmpInst> : public FixedNumOperandTraits<2> {
753 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(CmpInst, Value)
755 } // End llvm namespace