TargetFolder.h revision 411984810e4a66591123e1b16873e5f19ae18817 
1//====-- llvm/Support/TargetFolder.h - Constant folding helper -*- C++ -*-====//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file defines the TargetFolder class, a helper for IRBuilder.
11// It provides IRBuilder with a set of methods for creating constants with
12// target dependent folding, in addition to the same target-independent
13// folding that the ConstantFolder class provides.  For general constant
14// creation and folding, use ConstantExpr and the routines in
15// llvm/Analysis/ConstantFolding.h.
16//
17//===----------------------------------------------------------------------===//
18
19#ifndef LLVM_SUPPORT_TARGETFOLDER_H
20#define LLVM_SUPPORT_TARGETFOLDER_H
21
22#include "llvm/Constants.h"
23#include "llvm/InstrTypes.h"
24#include "llvm/Analysis/ConstantFolding.h"
25
26namespace llvm {
27
28class TargetData;
29
30/// TargetFolder - Create constants with target dependent folding.
31class TargetFolder {
32  const TargetData *TD;
33
34  /// Fold - Fold the constant using target specific information.
35  Constant *Fold(Constant *C) const {
36    if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C))
37      if (Constant *CF = ConstantFoldConstantExpression(CE, TD))
38        return CF;
39    return C;
40  }
41
42public:
43  explicit TargetFolder(const TargetData *TheTD) : TD(TheTD) {}
44
45  //===--------------------------------------------------------------------===//
46  // Binary Operators
47  //===--------------------------------------------------------------------===//
48
49  Constant *CreateAdd(Constant *LHS, Constant *RHS) const {
50    return Fold(ConstantExpr::getAdd(LHS, RHS));
51  }
52  Constant *CreateNSWAdd(Constant *LHS, Constant *RHS) const {
53    return Fold(ConstantExpr::getNSWAdd(LHS, RHS));
54  }
55  Constant *CreateFAdd(Constant *LHS, Constant *RHS) const {
56    return Fold(ConstantExpr::getFAdd(LHS, RHS));
57  }
58  Constant *CreateSub(Constant *LHS, Constant *RHS) const {
59    return Fold(ConstantExpr::getSub(LHS, RHS));
60  }
61  Constant *CreateNSWSub(Constant *LHS, Constant *RHS) const {
62    return Fold(ConstantExpr::getNSWSub(LHS, RHS));
63  }
64  Constant *CreateFSub(Constant *LHS, Constant *RHS) const {
65    return Fold(ConstantExpr::getFSub(LHS, RHS));
66  }
67  Constant *CreateMul(Constant *LHS, Constant *RHS) const {
68    return Fold(ConstantExpr::getMul(LHS, RHS));
69  }
70  Constant *CreateNSWMul(Constant *LHS, Constant *RHS) const {
71    return Fold(ConstantExpr::getNSWMul(LHS, RHS));
72  }
73  Constant *CreateFMul(Constant *LHS, Constant *RHS) const {
74    return Fold(ConstantExpr::getFMul(LHS, RHS));
75  }
76  Constant *CreateUDiv(Constant *LHS, Constant *RHS) const {
77    return Fold(ConstantExpr::getUDiv(LHS, RHS));
78  }
79  Constant *CreateSDiv(Constant *LHS, Constant *RHS) const {
80    return Fold(ConstantExpr::getSDiv(LHS, RHS));
81  }
82  Constant *CreateExactSDiv(Constant *LHS, Constant *RHS) const {
83    return Fold(ConstantExpr::getExactSDiv(LHS, RHS));
84  }
85  Constant *CreateFDiv(Constant *LHS, Constant *RHS) const {
86    return Fold(ConstantExpr::getFDiv(LHS, RHS));
87  }
88  Constant *CreateURem(Constant *LHS, Constant *RHS) const {
89    return Fold(ConstantExpr::getURem(LHS, RHS));
90  }
91  Constant *CreateSRem(Constant *LHS, Constant *RHS) const {
92    return Fold(ConstantExpr::getSRem(LHS, RHS));
93  }
94  Constant *CreateFRem(Constant *LHS, Constant *RHS) const {
95    return Fold(ConstantExpr::getFRem(LHS, RHS));
96  }
97  Constant *CreateShl(Constant *LHS, Constant *RHS) const {
98    return Fold(ConstantExpr::getShl(LHS, RHS));
99  }
100  Constant *CreateLShr(Constant *LHS, Constant *RHS) const {
101    return Fold(ConstantExpr::getLShr(LHS, RHS));
102  }
103  Constant *CreateAShr(Constant *LHS, Constant *RHS) const {
104    return Fold(ConstantExpr::getAShr(LHS, RHS));
105  }
106  Constant *CreateAnd(Constant *LHS, Constant *RHS) const {
107    return Fold(ConstantExpr::getAnd(LHS, RHS));
108  }
109  Constant *CreateOr(Constant *LHS, Constant *RHS) const {
110    return Fold(ConstantExpr::getOr(LHS, RHS));
111  }
112  Constant *CreateXor(Constant *LHS, Constant *RHS) const {
113    return Fold(ConstantExpr::getXor(LHS, RHS));
114  }
115
116  Constant *CreateBinOp(Instruction::BinaryOps Opc,
117                        Constant *LHS, Constant *RHS) const {
118    return Fold(ConstantExpr::get(Opc, LHS, RHS));
119  }
120
121  //===--------------------------------------------------------------------===//
122  // Unary Operators
123  //===--------------------------------------------------------------------===//
124
125  Constant *CreateNeg(Constant *C) const {
126    return Fold(ConstantExpr::getNeg(C));
127  }
128  Constant *CreateNSWNeg(Constant *C) const {
129    return Fold(ConstantExpr::getNSWNeg(C));
130  }
131  Constant *CreateFNeg(Constant *C) const {
132    return Fold(ConstantExpr::getFNeg(C));
133  }
134  Constant *CreateNot(Constant *C) const {
135    return Fold(ConstantExpr::getNot(C));
136  }
137
138  //===--------------------------------------------------------------------===//
139  // Memory Instructions
140  //===--------------------------------------------------------------------===//
141
142  Constant *CreateGetElementPtr(Constant *C, Constant* const *IdxList,
143                                unsigned NumIdx) const {
144    return Fold(ConstantExpr::getGetElementPtr(C, IdxList, NumIdx));
145  }
146  Constant *CreateGetElementPtr(Constant *C, Value* const *IdxList,
147                                unsigned NumIdx) const {
148    return Fold(ConstantExpr::getGetElementPtr(C, IdxList, NumIdx));
149  }
150
151  Constant *CreateInBoundsGetElementPtr(Constant *C, Constant* const *IdxList,
152                                        unsigned NumIdx) const {
153    return Fold(ConstantExpr::getInBoundsGetElementPtr(C, IdxList, NumIdx));
154  }
155  Constant *CreateInBoundsGetElementPtr(Constant *C, Value* const *IdxList,
156                                        unsigned NumIdx) const {
157    return Fold(ConstantExpr::getInBoundsGetElementPtr(C, IdxList, NumIdx));
158  }
159
160  //===--------------------------------------------------------------------===//
161  // Cast/Conversion Operators
162  //===--------------------------------------------------------------------===//
163
164  Constant *CreateCast(Instruction::CastOps Op, Constant *C,
165                       const Type *DestTy) const {
166    if (C->getType() == DestTy)
167      return C; // avoid calling Fold
168    return Fold(ConstantExpr::getCast(Op, C, DestTy));
169  }
170  Constant *CreateIntCast(Constant *C, const Type *DestTy,
171                          bool isSigned) const {
172    if (C->getType() == DestTy)
173      return C; // avoid calling Fold
174    return Fold(ConstantExpr::getIntegerCast(C, DestTy, isSigned));
175  }
176
177  Constant *CreateBitCast(Constant *C, const Type *DestTy) const {
178    return CreateCast(Instruction::BitCast, C, DestTy);
179  }
180  Constant *CreateIntToPtr(Constant *C, const Type *DestTy) const {
181    return CreateCast(Instruction::IntToPtr, C, DestTy);
182  }
183  Constant *CreatePtrToInt(Constant *C, const Type *DestTy) const {
184    return CreateCast(Instruction::PtrToInt, C, DestTy);
185  }
186  Constant *CreateZExtOrBitCast(Constant *C, const Type *DestTy) const {
187    if (C->getType() == DestTy)
188      return C; // avoid calling Fold
189    return Fold(ConstantExpr::getZExtOrBitCast(C, DestTy));
190  }
191  Constant *CreateSExtOrBitCast(Constant *C, const Type *DestTy) const {
192    if (C->getType() == DestTy)
193      return C; // avoid calling Fold
194    return Fold(ConstantExpr::getSExtOrBitCast(C, DestTy));
195  }
196  Constant *CreateTruncOrBitCast(Constant *C, const Type *DestTy) const {
197    if (C->getType() == DestTy)
198      return C; // avoid calling Fold
199    return Fold(ConstantExpr::getTruncOrBitCast(C, DestTy));
200  }
201
202  //===--------------------------------------------------------------------===//
203  // Compare Instructions
204  //===--------------------------------------------------------------------===//
205
206  Constant *CreateICmp(CmpInst::Predicate P, Constant *LHS,
207                       Constant *RHS) const {
208    return Fold(ConstantExpr::getCompare(P, LHS, RHS));
209  }
210  Constant *CreateFCmp(CmpInst::Predicate P, Constant *LHS,
211                       Constant *RHS) const {
212    return Fold(ConstantExpr::getCompare(P, LHS, RHS));
213  }
214
215  //===--------------------------------------------------------------------===//
216  // Other Instructions
217  //===--------------------------------------------------------------------===//
218
219  Constant *CreateSelect(Constant *C, Constant *True, Constant *False) const {
220    return Fold(ConstantExpr::getSelect(C, True, False));
221  }
222
223  Constant *CreateExtractElement(Constant *Vec, Constant *Idx) const {
224    return Fold(ConstantExpr::getExtractElement(Vec, Idx));
225  }
226
227  Constant *CreateInsertElement(Constant *Vec, Constant *NewElt,
228                                Constant *Idx) const {
229    return Fold(ConstantExpr::getInsertElement(Vec, NewElt, Idx));
230  }
231
232  Constant *CreateShuffleVector(Constant *V1, Constant *V2,
233                                Constant *Mask) const {
234    return Fold(ConstantExpr::getShuffleVector(V1, V2, Mask));
235  }
236
237  Constant *CreateExtractValue(Constant *Agg, const unsigned *IdxList,
238                               unsigned NumIdx) const {
239    return Fold(ConstantExpr::getExtractValue(Agg, IdxList, NumIdx));
240  }
241
242  Constant *CreateInsertValue(Constant *Agg, Constant *Val,
243                              const unsigned *IdxList, unsigned NumIdx) const {
244    return Fold(ConstantExpr::getInsertValue(Agg, Val, IdxList, NumIdx));
245  }
246};
247
248}
249
250#endif
251