llvm.org GIT mirror llvm / release_25 include / llvm / Support / IRBuilder.h
release_25

Tree @release_25 (Download .tar.gz)

IRBuilder.h @release_25raw · history · blame

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
//===---- llvm/Support/IRBuilder.h - Builder for LLVM Instrs ----*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the IRBuilder class, which is used as a convenient way
// to create LLVM instructions with a consistent and simplified interface.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_SUPPORT_IRBUILDER_H
#define LLVM_SUPPORT_IRBUILDER_H

#include "llvm/Constants.h"
#include "llvm/Instructions.h"
#include "llvm/GlobalVariable.h"
#include "llvm/Function.h"
#include "llvm/Support/ConstantFolder.h"

namespace llvm {

/// IRBuilder - This provides a uniform API for creating instructions and
/// inserting them into a basic block: either at the end of a BasicBlock, or
/// at a specific iterator location in a block.
///
/// Note that the builder does not expose the full generality of LLVM
/// instructions.  For example, it cannot be used to create instructions with
/// arbitrary names (specifically, names with nul characters in them) - It only
/// supports nul-terminated C strings.  For fully generic names, use
/// I->setName().  For access to extra instruction properties, use the mutators
/// (e.g. setVolatile) on the instructions after they have been created.
/// The first template argument handles whether or not to preserve names in the
/// final instruction output. This defaults to on.  The second template argument
/// specifies a class to use for creating constants.  This defaults to creating
/// minimally folded constants.
template <bool preserveNames=true, typename T = ConstantFolder> class IRBuilder{
  BasicBlock *BB;
  BasicBlock::iterator InsertPt;
  T Folder;
public:
  IRBuilder(const T& F = T()) : Folder(F) { ClearInsertionPoint(); }
  explicit IRBuilder(BasicBlock *TheBB, const T& F = T())
    : Folder(F) { SetInsertPoint(TheBB); }
  IRBuilder(BasicBlock *TheBB, BasicBlock::iterator IP, const T& F = T())
    : Folder(F) { SetInsertPoint(TheBB, IP); }

  /// getFolder - Get the constant folder being used.
  const T& getFolder() { return Folder; }

  //===--------------------------------------------------------------------===//
  // Builder configuration methods
  //===--------------------------------------------------------------------===//

  /// ClearInsertionPoint - Clear the insertion point: created instructions will
  /// not be inserted into a block.
  void ClearInsertionPoint() {
    BB = 0;
  }

  BasicBlock *GetInsertBlock() const { return BB; }

  /// SetInsertPoint - This specifies that created instructions should be
  /// appended to the end of the specified block.
  void SetInsertPoint(BasicBlock *TheBB) {
    BB = TheBB;
    InsertPt = BB->end();
  }

  /// SetInsertPoint - This specifies that created instructions should be
  /// inserted at the specified point.
  void SetInsertPoint(BasicBlock *TheBB, BasicBlock::iterator IP) {
    BB = TheBB;
    InsertPt = IP;
  }

  /// Insert - Insert and return the specified instruction.
  template<typename InstTy>
  InstTy *Insert(InstTy *I, const char *Name = "") const {
    InsertHelper(I, Name);
    return I;
  }

  /// InsertHelper - Insert the specified instruction at the specified insertion
  /// point.  This is split out of Insert so that it isn't duplicated for every
  /// template instantiation.
  void InsertHelper(Instruction *I, const char *Name) const {
    if (BB) BB->getInstList().insert(InsertPt, I);
    if (preserveNames && Name[0])
      I->setName(Name);
  }

  //===--------------------------------------------------------------------===//
  // Instruction creation methods: Terminators
  //===--------------------------------------------------------------------===//

  /// CreateRetVoid - Create a 'ret void' instruction.
  ReturnInst *CreateRetVoid() {
    return Insert(ReturnInst::Create());
  }

  /// @verbatim
  /// CreateRet - Create a 'ret <val>' instruction.
  /// @endverbatim
  ReturnInst *CreateRet(Value *V) {
    return Insert(ReturnInst::Create(V));
  }

  /// CreateAggregateRet - Create a sequence of N insertvalue instructions,
  /// with one Value from the retVals array each, that build a aggregate
  /// return value one value at a time, and a ret instruction to return
  /// the resulting aggregate value. This is a convenience function for
  /// code that uses aggregate return values as a vehicle for having
  /// multiple return values.
  ///
  ReturnInst *CreateAggregateRet(Value * const* retVals, unsigned N) {
    const Type *RetType = BB->getParent()->getReturnType();
    Value *V = UndefValue::get(RetType);
    for (unsigned i = 0; i != N; ++i)
      V = CreateInsertValue(V, retVals[i], i, "mrv");
    return Insert(ReturnInst::Create(V));
  }

  /// CreateBr - Create an unconditional 'br label X' instruction.
  BranchInst *CreateBr(BasicBlock *Dest) {
    return Insert(BranchInst::Create(Dest));
  }

  /// CreateCondBr - Create a conditional 'br Cond, TrueDest, FalseDest'
  /// instruction.
  BranchInst *CreateCondBr(Value *Cond, BasicBlock *True, BasicBlock *False) {
    return Insert(BranchInst::Create(True, False, Cond));
  }

  /// CreateSwitch - Create a switch instruction with the specified value,
  /// default dest, and with a hint for the number of cases that will be added
  /// (for efficient allocation).
  SwitchInst *CreateSwitch(Value *V, BasicBlock *Dest, unsigned NumCases = 10) {
    return Insert(SwitchInst::Create(V, Dest, NumCases));
  }

  /// CreateInvoke - Create an invoke instruction.
  template<typename InputIterator>
  InvokeInst *CreateInvoke(Value *Callee, BasicBlock *NormalDest,
                           BasicBlock *UnwindDest, InputIterator ArgBegin,
                           InputIterator ArgEnd, const char *Name = "") {
    return Insert(InvokeInst::Create(Callee, NormalDest, UnwindDest,
                                     ArgBegin, ArgEnd), Name);
  }

  UnwindInst *CreateUnwind() {
    return Insert(new UnwindInst());
  }

  UnreachableInst *CreateUnreachable() {
    return Insert(new UnreachableInst());
  }

  //===--------------------------------------------------------------------===//
  // Instruction creation methods: Binary Operators
  //===--------------------------------------------------------------------===//

  Value *CreateAdd(Value *LHS, Value *RHS, const char *Name = "") {
    if (Constant *LC = dyn_cast<Constant>(LHS))
      if (Constant *RC = dyn_cast<Constant>(RHS))
        return Folder.CreateAdd(LC, RC);
    return Insert(BinaryOperator::CreateAdd(LHS, RHS), Name);
  }
  Value *CreateSub(Value *LHS, Value *RHS, const char *Name = "") {
    if (Constant *LC = dyn_cast<Constant>(LHS))
      if (Constant *RC = dyn_cast<Constant>(RHS))
        return Folder.CreateSub(LC, RC);
    return Insert(BinaryOperator::CreateSub(LHS, RHS), Name);
  }
  Value *CreateMul(Value *LHS, Value *RHS, const char *Name = "") {
    if (Constant *LC = dyn_cast<Constant>(LHS))
      if (Constant *RC = dyn_cast<Constant>(RHS))
        return Folder.CreateMul(LC, RC);
    return Insert(BinaryOperator::CreateMul(LHS, RHS), Name);
  }
  Value *CreateUDiv(Value *LHS, Value *RHS, const char *Name = "") {
    if (Constant *LC = dyn_cast<Constant>(LHS))
      if (Constant *RC = dyn_cast<Constant>(RHS))
        return Folder.CreateUDiv(LC, RC);
    return Insert(BinaryOperator::CreateUDiv(LHS, RHS), Name);
  }
  Value *CreateSDiv(Value *LHS, Value *RHS, const char *Name = "") {
    if (Constant *LC = dyn_cast<Constant>(LHS))
      if (Constant *RC = dyn_cast<Constant>(RHS))
        return Folder.CreateSDiv(LC, RC);
    return Insert(BinaryOperator::CreateSDiv(LHS, RHS), Name);
  }
  Value *CreateFDiv(Value *LHS, Value *RHS, const char *Name = "") {
    if (Constant *LC = dyn_cast<Constant>(LHS))
      if (Constant *RC = dyn_cast<Constant>(RHS))
        return Folder.CreateFDiv(LC, RC);
    return Insert(BinaryOperator::CreateFDiv(LHS, RHS), Name);
  }
  Value *CreateURem(Value *LHS, Value *RHS, const char *Name = "") {
    if (Constant *LC = dyn_cast<Constant>(LHS))
      if (Constant *RC = dyn_cast<Constant>(RHS))
        return Folder.CreateURem(LC, RC);
    return Insert(BinaryOperator::CreateURem(LHS, RHS), Name);
  }
  Value *CreateSRem(Value *LHS, Value *RHS, const char *Name = "") {
    if (Constant *LC = dyn_cast<Constant>(LHS))
      if (Constant *RC = dyn_cast<Constant>(RHS))
        return Folder.CreateSRem(LC, RC);
    return Insert(BinaryOperator::CreateSRem(LHS, RHS), Name);
  }
  Value *CreateFRem(Value *LHS, Value *RHS, const char *Name = "") {
    if (Constant *LC = dyn_cast<Constant>(LHS))
      if (Constant *RC = dyn_cast<Constant>(RHS))
        return Folder.CreateFRem(LC, RC);
    return Insert(BinaryOperator::CreateFRem(LHS, RHS), Name);
  }
  Value *CreateShl(Value *LHS, Value *RHS, const char *Name = "") {
    if (Constant *LC = dyn_cast<Constant>(LHS))
      if (Constant *RC = dyn_cast<Constant>(RHS))
        return Folder.CreateShl(LC, RC);
    return Insert(BinaryOperator::CreateShl(LHS, RHS), Name);
  }
  Value *CreateLShr(Value *LHS, Value *RHS, const char *Name = "") {
    if (Constant *LC = dyn_cast<Constant>(LHS))
      if (Constant *RC = dyn_cast<Constant>(RHS))
        return Folder.CreateLShr(LC, RC);
    return Insert(BinaryOperator::CreateLShr(LHS, RHS), Name);
  }
  Value *CreateAShr(Value *LHS, Value *RHS, const char *Name = "") {
    if (Constant *LC = dyn_cast<Constant>(LHS))
      if (Constant *RC = dyn_cast<Constant>(RHS))
        return Folder.CreateAShr(LC, RC);
    return Insert(BinaryOperator::CreateAShr(LHS, RHS), Name);
  }
  Value *CreateAnd(Value *LHS, Value *RHS, const char *Name = "") {
    if (Constant *LC = dyn_cast<Constant>(LHS))
      if (Constant *RC = dyn_cast<Constant>(RHS))
        return Folder.CreateAnd(LC, RC);
    return Insert(BinaryOperator::CreateAnd(LHS, RHS), Name);
  }
  Value *CreateOr(Value *LHS, Value *RHS, const char *Name = "") {
    if (Constant *LC = dyn_cast<Constant>(LHS))
      if (Constant *RC = dyn_cast<Constant>(RHS))
        return Folder.CreateOr(LC, RC);
    return Insert(BinaryOperator::CreateOr(LHS, RHS), Name);
  }
  Value *CreateXor(Value *LHS, Value *RHS, const char *Name = "") {
    if (Constant *LC = dyn_cast<Constant>(LHS))
      if (Constant *RC = dyn_cast<Constant>(RHS))
        return Folder.CreateXor(LC, RC);
    return Insert(BinaryOperator::CreateXor(LHS, RHS), Name);
  }

  Value *CreateBinOp(Instruction::BinaryOps Opc,
                     Value *LHS, Value *RHS, const char *Name = "") {
    if (Constant *LC = dyn_cast<Constant>(LHS))
      if (Constant *RC = dyn_cast<Constant>(RHS))
        return Folder.CreateBinOp(Opc, LC, RC);
    return Insert(BinaryOperator::Create(Opc, LHS, RHS), Name);
  }

  Value *CreateNeg(Value *V, const char *Name = "") {
    if (Constant *VC = dyn_cast<Constant>(V))
      return Folder.CreateNeg(VC);
    return Insert(BinaryOperator::CreateNeg(V), Name);
  }
  Value *CreateNot(Value *V, const char *Name = "") {
    if (Constant *VC = dyn_cast<Constant>(V))
      return Folder.CreateNot(VC);
    return Insert(BinaryOperator::CreateNot(V), Name);
  }

  //===--------------------------------------------------------------------===//
  // Instruction creation methods: Memory Instructions
  //===--------------------------------------------------------------------===//

  MallocInst *CreateMalloc(const Type *Ty, Value *ArraySize = 0,
                           const char *Name = "") {
    return Insert(new MallocInst(Ty, ArraySize), Name);
  }
  AllocaInst *CreateAlloca(const Type *Ty, Value *ArraySize = 0,
                           const char *Name = "") {
    return Insert(new AllocaInst(Ty, ArraySize), Name);
  }
  FreeInst *CreateFree(Value *Ptr) {
    return Insert(new FreeInst(Ptr));
  }
  LoadInst *CreateLoad(Value *Ptr, const char *Name = "") {
    return Insert(new LoadInst(Ptr), Name);
  }
  LoadInst *CreateLoad(Value *Ptr, bool isVolatile, const char *Name = "") {
    return Insert(new LoadInst(Ptr, 0, isVolatile), Name);
  }
  StoreInst *CreateStore(Value *Val, Value *Ptr, bool isVolatile = false) {
    return Insert(new StoreInst(Val, Ptr, isVolatile));
  }
  template<typename InputIterator>
  Value *CreateGEP(Value *Ptr, InputIterator IdxBegin, InputIterator IdxEnd,
                   const char *Name = "") {
    if (Constant *PC = dyn_cast<Constant>(Ptr)) {
      // Every index must be constant.
      InputIterator i;
      for (i = IdxBegin; i < IdxEnd; ++i) {
        if (!dyn_cast<Constant>(*i))
          break;
      }
      if (i == IdxEnd)
        return Folder.CreateGetElementPtr(PC, &IdxBegin[0], IdxEnd - IdxBegin);
    }
    return Insert(GetElementPtrInst::Create(Ptr, IdxBegin, IdxEnd), Name);
  }
  Value *CreateGEP(Value *Ptr, Value *Idx, const char *Name = "") {
    if (Constant *PC = dyn_cast<Constant>(Ptr))
      if (Constant *IC = dyn_cast<Constant>(Idx))
        return Folder.CreateGetElementPtr(PC, &IC, 1);
    return Insert(GetElementPtrInst::Create(Ptr, Idx), Name);
  }
  Value *CreateStructGEP(Value *Ptr, unsigned Idx, const char *Name = "") {
    llvm::Value *Idxs[] = {
      ConstantInt::get(llvm::Type::Int32Ty, 0),
      ConstantInt::get(llvm::Type::Int32Ty, Idx)
    };

    if (Constant *PC = dyn_cast<Constant>(Ptr))
      return Folder.CreateGetElementPtr(PC, Idxs, 2);

    return Insert(GetElementPtrInst::Create(Ptr, Idxs, Idxs+2), Name);
  }
  Value *CreateGlobalString(const char *Str = "", const char *Name = "") {
    Constant *StrConstant = ConstantArray::get(Str, true);
    GlobalVariable *gv = new llvm::GlobalVariable(StrConstant->getType(),
                                                  true,
                                                  GlobalValue::InternalLinkage,
                                                  StrConstant,
                                                  "",
                                                  BB->getParent()->getParent(),
                                                  false);
    gv->setName(Name);
    return gv;
  }
  Value *CreateGlobalStringPtr(const char *Str = "", const char *Name = "") {
    Value *gv = CreateGlobalString(Str, Name);
    Value *zero = llvm::ConstantInt::get(llvm::Type::Int32Ty, 0);
    Value *Args[] = { zero, zero };
    return CreateGEP(gv, Args, Args+2, Name);
  }
  //===--------------------------------------------------------------------===//
  // Instruction creation methods: Cast/Conversion Operators
  //===--------------------------------------------------------------------===//

  Value *CreateTrunc(Value *V, const Type *DestTy, const char *Name = "") {
    return CreateCast(Instruction::Trunc, V, DestTy, Name);
  }
  Value *CreateZExt(Value *V, const Type *DestTy, const char *Name = "") {
    return CreateCast(Instruction::ZExt, V, DestTy, Name);
  }
  Value *CreateSExt(Value *V, const Type *DestTy, const char *Name = "") {
    return CreateCast(Instruction::SExt, V, DestTy, Name);
  }
  Value *CreateFPToUI(Value *V, const Type *DestTy, const char *Name = ""){
    return CreateCast(Instruction::FPToUI, V, DestTy, Name);
  }
  Value *CreateFPToSI(Value *V, const Type *DestTy, const char *Name = ""){
    return CreateCast(Instruction::FPToSI, V, DestTy, Name);
  }
  Value *CreateUIToFP(Value *V, const Type *DestTy, const char *Name = ""){
    return CreateCast(Instruction::UIToFP, V, DestTy, Name);
  }
  Value *CreateSIToFP(Value *V, const Type *DestTy, const char *Name = ""){
    return CreateCast(Instruction::SIToFP, V, DestTy, Name);
  }
  Value *CreateFPTrunc(Value *V, const Type *DestTy,
                       const char *Name = "") {
    return CreateCast(Instruction::FPTrunc, V, DestTy, Name);
  }
  Value *CreateFPExt(Value *V, const Type *DestTy, const char *Name = "") {
    return CreateCast(Instruction::FPExt, V, DestTy, Name);
  }
  Value *CreatePtrToInt(Value *V, const Type *DestTy,
                        const char *Name = "") {
    return CreateCast(Instruction::PtrToInt, V, DestTy, Name);
  }
  Value *CreateIntToPtr(Value *V, const Type *DestTy,
                        const char *Name = "") {
    return CreateCast(Instruction::IntToPtr, V, DestTy, Name);
  }
  Value *CreateBitCast(Value *V, const Type *DestTy,
                       const char *Name = "") {
    return CreateCast(Instruction::BitCast, V, DestTy, Name);
  }

  Value *CreateCast(Instruction::CastOps Op, Value *V, const Type *DestTy,
                    const char *Name = "") {
    if (V->getType() == DestTy)
      return V;
    if (Constant *VC = dyn_cast<Constant>(V))
      return Folder.CreateCast(Op, VC, DestTy);
    return Insert(CastInst::Create(Op, V, DestTy), Name);
  }
  Value *CreateIntCast(Value *V, const Type *DestTy, bool isSigned,
                       const char *Name = "") {
    if (V->getType() == DestTy)
      return V;
    if (Constant *VC = dyn_cast<Constant>(V))
      return Folder.CreateIntCast(VC, DestTy, isSigned);
    return Insert(CastInst::CreateIntegerCast(V, DestTy, isSigned), Name);
  }

  //===--------------------------------------------------------------------===//
  // Instruction creation methods: Compare Instructions
  //===--------------------------------------------------------------------===//

  Value *CreateICmpEQ(Value *LHS, Value *RHS, const char *Name = "") {
    return CreateICmp(ICmpInst::ICMP_EQ, LHS, RHS, Name);
  }
  Value *CreateICmpNE(Value *LHS, Value *RHS, const char *Name = "") {
    return CreateICmp(ICmpInst::ICMP_NE, LHS, RHS, Name);
  }
  Value *CreateICmpUGT(Value *LHS, Value *RHS, const char *Name = "") {
    return CreateICmp(ICmpInst::ICMP_UGT, LHS, RHS, Name);
  }
  Value *CreateICmpUGE(Value *LHS, Value *RHS, const char *Name = "") {
    return CreateICmp(ICmpInst::ICMP_UGE, LHS, RHS, Name);
  }
  Value *CreateICmpULT(Value *LHS, Value *RHS, const char *Name = "") {
    return CreateICmp(ICmpInst::ICMP_ULT, LHS, RHS, Name);
  }
  Value *CreateICmpULE(Value *LHS, Value *RHS, const char *Name = "") {
    return CreateICmp(ICmpInst::ICMP_ULE, LHS, RHS, Name);
  }
  Value *CreateICmpSGT(Value *LHS, Value *RHS, const char *Name = "") {
    return CreateICmp(ICmpInst::ICMP_SGT, LHS, RHS, Name);
  }
  Value *CreateICmpSGE(Value *LHS, Value *RHS, const char *Name = "") {
    return CreateICmp(ICmpInst::ICMP_SGE, LHS, RHS, Name);
  }
  Value *CreateICmpSLT(Value *LHS, Value *RHS, const char *Name = "") {
    return CreateICmp(ICmpInst::ICMP_SLT, LHS, RHS, Name);
  }
  Value *CreateICmpSLE(Value *LHS, Value *RHS, const char *Name = "") {
    return CreateICmp(ICmpInst::ICMP_SLE, LHS, RHS, Name);
  }

  Value *CreateFCmpOEQ(Value *LHS, Value *RHS, const char *Name = "") {
    return CreateFCmp(FCmpInst::FCMP_OEQ, LHS, RHS, Name);
  }
  Value *CreateFCmpOGT(Value *LHS, Value *RHS, const char *Name = "") {
    return CreateFCmp(FCmpInst::FCMP_OGT, LHS, RHS, Name);
  }
  Value *CreateFCmpOGE(Value *LHS, Value *RHS, const char *Name = "") {
    return CreateFCmp(FCmpInst::FCMP_OGE, LHS, RHS, Name);
  }
  Value *CreateFCmpOLT(Value *LHS, Value *RHS, const char *Name = "") {
    return CreateFCmp(FCmpInst::FCMP_OLT, LHS, RHS, Name);
  }
  Value *CreateFCmpOLE(Value *LHS, Value *RHS, const char *Name = "") {
    return CreateFCmp(FCmpInst::FCMP_OLE, LHS, RHS, Name);
  }
  Value *CreateFCmpONE(Value *LHS, Value *RHS, const char *Name = "") {
    return CreateFCmp(FCmpInst::FCMP_ONE, LHS, RHS, Name);
  }
  Value *CreateFCmpORD(Value *LHS, Value *RHS, const char *Name = "") {
    return CreateFCmp(FCmpInst::FCMP_ORD, LHS, RHS, Name);
  }
  Value *CreateFCmpUNO(Value *LHS, Value *RHS, const char *Name = "") {
    return CreateFCmp(FCmpInst::FCMP_UNO, LHS, RHS, Name);
  }
  Value *CreateFCmpUEQ(Value *LHS, Value *RHS, const char *Name = "") {
    return CreateFCmp(FCmpInst::FCMP_UEQ, LHS, RHS, Name);
  }
  Value *CreateFCmpUGT(Value *LHS, Value *RHS, const char *Name = "") {
    return CreateFCmp(FCmpInst::FCMP_UGT, LHS, RHS, Name);
  }
  Value *CreateFCmpUGE(Value *LHS, Value *RHS, const char *Name = "") {
    return CreateFCmp(FCmpInst::FCMP_UGE, LHS, RHS, Name);
  }
  Value *CreateFCmpULT(Value *LHS, Value *RHS, const char *Name = "") {
    return CreateFCmp(FCmpInst::FCMP_ULT, LHS, RHS, Name);
  }
  Value *CreateFCmpULE(Value *LHS, Value *RHS, const char *Name = "") {
    return CreateFCmp(FCmpInst::FCMP_ULE, LHS, RHS, Name);
  }
  Value *CreateFCmpUNE(Value *LHS, Value *RHS, const char *Name = "") {
    return CreateFCmp(FCmpInst::FCMP_UNE, LHS, RHS, Name);
  }

  Value *CreateICmp(CmpInst::Predicate P, Value *LHS, Value *RHS,
                    const char *Name = "") {
    if (Constant *LC = dyn_cast<Constant>(LHS))
      if (Constant *RC = dyn_cast<Constant>(RHS))
        return Folder.CreateICmp(P, LC, RC);
    return Insert(new ICmpInst(P, LHS, RHS), Name);
  }
  Value *CreateFCmp(CmpInst::Predicate P, Value *LHS, Value *RHS,
                    const char *Name = "") {
    if (Constant *LC = dyn_cast<Constant>(LHS))
      if (Constant *RC = dyn_cast<Constant>(RHS))
        return Folder.CreateFCmp(P, LC, RC);
    return Insert(new FCmpInst(P, LHS, RHS), Name);
  }

  Value *CreateVICmp(CmpInst::Predicate P, Value *LHS, Value *RHS,
                     const char *Name = "") {
    if (Constant *LC = dyn_cast<Constant>(LHS))
      if (Constant *RC = dyn_cast<Constant>(RHS))
        return Folder.CreateVICmp(P, LC, RC);
    return Insert(new VICmpInst(P, LHS, RHS), Name);
  }
  Value *CreateVFCmp(CmpInst::Predicate P, Value *LHS, Value *RHS,
                     const char *Name = "") {
    if (Constant *LC = dyn_cast<Constant>(LHS))
      if (Constant *RC = dyn_cast<Constant>(RHS))
        return Folder.CreateVFCmp(P, LC, RC);
    return Insert(new VFCmpInst(P, LHS, RHS), Name);
  }

  //===--------------------------------------------------------------------===//
  // Instruction creation methods: Other Instructions
  //===--------------------------------------------------------------------===//

  PHINode *CreatePHI(const Type *Ty, const char *Name = "") {
    return Insert(PHINode::Create(Ty), Name);
  }

  CallInst *CreateCall(Value *Callee, const char *Name = "") {
    return Insert(CallInst::Create(Callee), Name);
  }
  CallInst *CreateCall(Value *Callee, Value *Arg, const char *Name = "") {
    return Insert(CallInst::Create(Callee, Arg), Name);
  }
  CallInst *CreateCall2(Value *Callee, Value *Arg1, Value *Arg2,
                        const char *Name = "") {
    Value *Args[] = { Arg1, Arg2 };
    return Insert(CallInst::Create(Callee, Args, Args+2), Name);
  }
  CallInst *CreateCall3(Value *Callee, Value *Arg1, Value *Arg2, Value *Arg3,
                        const char *Name = "") {
    Value *Args[] = { Arg1, Arg2, Arg3 };
    return Insert(CallInst::Create(Callee, Args, Args+3), Name);
  }
  CallInst *CreateCall4(Value *Callee, Value *Arg1, Value *Arg2, Value *Arg3,
                        Value *Arg4, const char *Name = "") {
    Value *Args[] = { Arg1, Arg2, Arg3, Arg4 };
    return Insert(CallInst::Create(Callee, Args, Args+4), Name);
  }

  template<typename InputIterator>
  CallInst *CreateCall(Value *Callee, InputIterator ArgBegin,
                       InputIterator ArgEnd, const char *Name = "") {
    return Insert(CallInst::Create(Callee, ArgBegin, ArgEnd), Name);
  }

  Value *CreateSelect(Value *C, Value *True, Value *False,
                      const char *Name = "") {
    if (Constant *CC = dyn_cast<Constant>(C))
      if (Constant *TC = dyn_cast<Constant>(True))
        if (Constant *FC = dyn_cast<Constant>(False))
          return Folder.CreateSelect(CC, TC, FC);
    return Insert(SelectInst::Create(C, True, False), Name);
  }

  VAArgInst *CreateVAArg(Value *List, const Type *Ty, const char *Name = "") {
    return Insert(new VAArgInst(List, Ty), Name);
  }

  Value *CreateExtractElement(Value *Vec, Value *Idx,
                              const char *Name = "") {
    if (Constant *VC = dyn_cast<Constant>(Vec))
      if (Constant *IC = dyn_cast<Constant>(Idx))
        return Folder.CreateExtractElement(VC, IC);
    return Insert(new ExtractElementInst(Vec, Idx), Name);
  }

  Value *CreateInsertElement(Value *Vec, Value *NewElt, Value *Idx,
                             const char *Name = "") {
    if (Constant *VC = dyn_cast<Constant>(Vec))
      if (Constant *NC = dyn_cast<Constant>(NewElt))
        if (Constant *IC = dyn_cast<Constant>(Idx))
          return Folder.CreateInsertElement(VC, NC, IC);
    return Insert(InsertElementInst::Create(Vec, NewElt, Idx), Name);
  }

  Value *CreateShuffleVector(Value *V1, Value *V2, Value *Mask,
                             const char *Name = "") {
    if (Constant *V1C = dyn_cast<Constant>(V1))
      if (Constant *V2C = dyn_cast<Constant>(V2))
        if (Constant *MC = dyn_cast<Constant>(Mask))
          return Folder.CreateShuffleVector(V1C, V2C, MC);
    return Insert(new ShuffleVectorInst(V1, V2, Mask), Name);
  }

  Value *CreateExtractValue(Value *Agg, unsigned Idx,
                            const char *Name = "") {
    if (Constant *AggC = dyn_cast<Constant>(Agg))
      return Folder.CreateExtractValue(AggC, &Idx, 1);
    return Insert(ExtractValueInst::Create(Agg, Idx), Name);
  }

  template<typename InputIterator>
  Value *CreateExtractValue(Value *Agg,
                            InputIterator IdxBegin,
                            InputIterator IdxEnd,
                            const char *Name = "") {
    if (Constant *AggC = dyn_cast<Constant>(Agg))
      return Folder.CreateExtractValue(AggC, IdxBegin, IdxEnd - IdxBegin);
    return Insert(ExtractValueInst::Create(Agg, IdxBegin, IdxEnd), Name);
  }

  Value *CreateInsertValue(Value *Agg, Value *Val, unsigned Idx,
                           const char *Name = "") {
    if (Constant *AggC = dyn_cast<Constant>(Agg))
      if (Constant *ValC = dyn_cast<Constant>(Val))
        return Folder.CreateInsertValue(AggC, ValC, &Idx, 1);
    return Insert(InsertValueInst::Create(Agg, Val, Idx), Name);
  }

  template<typename InputIterator>
  Value *CreateInsertValue(Value *Agg, Value *Val,
                           InputIterator IdxBegin,
                           InputIterator IdxEnd,
                           const char *Name = "") {
    if (Constant *AggC = dyn_cast<Constant>(Agg))
      if (Constant *ValC = dyn_cast<Constant>(Val))
        return Folder.CreateInsertValue(AggC, ValC,
                                            IdxBegin, IdxEnd - IdxBegin);
    return Insert(InsertValueInst::Create(Agg, Val, IdxBegin, IdxEnd), Name);
  }

  //===--------------------------------------------------------------------===//
  // Utility creation methods
  //===--------------------------------------------------------------------===//

  /// CreateIsNull - Return an i1 value testing if \arg Arg is null.
  Value *CreateIsNull(Value *Arg, const char *Name = "") {
    return CreateICmpEQ(Arg, llvm::Constant::getNullValue(Arg->getType()), 
                        Name);
  }

  /// CreateIsNotNull - Return an i1 value testing if \arg Arg is not null.
  Value *CreateIsNotNull(Value *Arg, const char *Name = "") {
    return CreateICmpNE(Arg, llvm::Constant::getNullValue(Arg->getType()), 
                        Name);
  }
  
};

}

#endif