TargetFolder.h revision 46d1ddd13c1529fd669c7c66fa8bea54f26188ba 
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 *CreateNUWAdd(Constant *LHS, Constant *RHS) const {
56    return Fold(ConstantExpr::getNUWAdd(LHS, RHS));
57  }
58  Constant *CreateFAdd(Constant *LHS, Constant *RHS) const {
59    return Fold(ConstantExpr::getFAdd(LHS, RHS));
60  }
61  Constant *CreateSub(Constant *LHS, Constant *RHS) const {
62    return Fold(ConstantExpr::getSub(LHS, RHS));
63  }
64  Constant *CreateNSWSub(Constant *LHS, Constant *RHS) const {
65    return Fold(ConstantExpr::getNSWSub(LHS, RHS));
66  }
67  Constant *CreateNUWSub(Constant *LHS, Constant *RHS) const {
68    return Fold(ConstantExpr::getNUWSub(LHS, RHS));
69  }
70  Constant *CreateFSub(Constant *LHS, Constant *RHS) const {
71    return Fold(ConstantExpr::getFSub(LHS, RHS));
72  }
73  Constant *CreateMul(Constant *LHS, Constant *RHS) const {
74    return Fold(ConstantExpr::getMul(LHS, RHS));
75  }
76  Constant *CreateNSWMul(Constant *LHS, Constant *RHS) const {
77    return Fold(ConstantExpr::getNSWMul(LHS, RHS));
78  }
79  Constant *CreateNUWMul(Constant *LHS, Constant *RHS) const {
80    return Fold(ConstantExpr::getNUWMul(LHS, RHS));
81  }
82  Constant *CreateFMul(Constant *LHS, Constant *RHS) const {
83    return Fold(ConstantExpr::getFMul(LHS, RHS));
84  }
85  Constant *CreateUDiv(Constant *LHS, Constant *RHS) const {
86    return Fold(ConstantExpr::getUDiv(LHS, RHS));
87  }
88  Constant *CreateSDiv(Constant *LHS, Constant *RHS) const {
89    return Fold(ConstantExpr::getSDiv(LHS, RHS));
90  }
91  Constant *CreateExactSDiv(Constant *LHS, Constant *RHS) const {
92    return Fold(ConstantExpr::getExactSDiv(LHS, RHS));
93  }
94  Constant *CreateFDiv(Constant *LHS, Constant *RHS) const {
95    return Fold(ConstantExpr::getFDiv(LHS, RHS));
96  }
97  Constant *CreateURem(Constant *LHS, Constant *RHS) const {
98    return Fold(ConstantExpr::getURem(LHS, RHS));
99  }
100  Constant *CreateSRem(Constant *LHS, Constant *RHS) const {
101    return Fold(ConstantExpr::getSRem(LHS, RHS));
102  }
103  Constant *CreateFRem(Constant *LHS, Constant *RHS) const {
104    return Fold(ConstantExpr::getFRem(LHS, RHS));
105  }
106  Constant *CreateShl(Constant *LHS, Constant *RHS) const {
107    return Fold(ConstantExpr::getShl(LHS, RHS));
108  }
109  Constant *CreateLShr(Constant *LHS, Constant *RHS) const {
110    return Fold(ConstantExpr::getLShr(LHS, RHS));
111  }
112  Constant *CreateAShr(Constant *LHS, Constant *RHS) const {
113    return Fold(ConstantExpr::getAShr(LHS, RHS));
114  }
115  Constant *CreateAnd(Constant *LHS, Constant *RHS) const {
116    return Fold(ConstantExpr::getAnd(LHS, RHS));
117  }
118  Constant *CreateOr(Constant *LHS, Constant *RHS) const {
119    return Fold(ConstantExpr::getOr(LHS, RHS));
120  }
121  Constant *CreateXor(Constant *LHS, Constant *RHS) const {
122    return Fold(ConstantExpr::getXor(LHS, RHS));
123  }
124
125  Constant *CreateBinOp(Instruction::BinaryOps Opc,
126                        Constant *LHS, Constant *RHS) const {
127    return Fold(ConstantExpr::get(Opc, LHS, RHS));
128  }
129
130  //===--------------------------------------------------------------------===//
131  // Unary Operators
132  //===--------------------------------------------------------------------===//
133
134  Constant *CreateNeg(Constant *C) const {
135    return Fold(ConstantExpr::getNeg(C));
136  }
137  Constant *CreateNSWNeg(Constant *C) const {
138    return Fold(ConstantExpr::getNSWNeg(C));
139  }
140  Constant *CreateNUWNeg(Constant *C) const {
141    return Fold(ConstantExpr::getNUWNeg(C));
142  }
143  Constant *CreateFNeg(Constant *C) const {
144    return Fold(ConstantExpr::getFNeg(C));
145  }
146  Constant *CreateNot(Constant *C) const {
147    return Fold(ConstantExpr::getNot(C));
148  }
149
150  //===--------------------------------------------------------------------===//
151  // Memory Instructions
152  //===--------------------------------------------------------------------===//
153
154  Constant *CreateGetElementPtr(Constant *C, Constant* const *IdxList,
155                                unsigned NumIdx) const {
156    return Fold(ConstantExpr::getGetElementPtr(C, IdxList, NumIdx));
157  }
158  Constant *CreateGetElementPtr(Constant *C, Value* const *IdxList,
159                                unsigned NumIdx) const {
160    return Fold(ConstantExpr::getGetElementPtr(C, IdxList, NumIdx));
161  }
162
163  Constant *CreateInBoundsGetElementPtr(Constant *C, Constant* const *IdxList,
164                                        unsigned NumIdx) const {
165    return Fold(ConstantExpr::getInBoundsGetElementPtr(C, IdxList, NumIdx));
166  }
167  Constant *CreateInBoundsGetElementPtr(Constant *C, Value* const *IdxList,
168                                        unsigned NumIdx) const {
169    return Fold(ConstantExpr::getInBoundsGetElementPtr(C, IdxList, NumIdx));
170  }
171
172  //===--------------------------------------------------------------------===//
173  // Cast/Conversion Operators
174  //===--------------------------------------------------------------------===//
175
176  Constant *CreateCast(Instruction::CastOps Op, Constant *C,
177                       const Type *DestTy) const {
178    if (C->getType() == DestTy)
179      return C; // avoid calling Fold
180    return Fold(ConstantExpr::getCast(Op, C, DestTy));
181  }
182  Constant *CreateIntCast(Constant *C, const Type *DestTy,
183                          bool isSigned) const {
184    if (C->getType() == DestTy)
185      return C; // avoid calling Fold
186    return Fold(ConstantExpr::getIntegerCast(C, DestTy, isSigned));
187  }
188  Constant *CreatePointerCast(Constant *C, const Type *DestTy) const {
189    return ConstantExpr::getPointerCast(C, DestTy);
190  }
191  Constant *CreateBitCast(Constant *C, const Type *DestTy) const {
192    return CreateCast(Instruction::BitCast, C, DestTy);
193  }
194  Constant *CreateIntToPtr(Constant *C, const Type *DestTy) const {
195    return CreateCast(Instruction::IntToPtr, C, DestTy);
196  }
197  Constant *CreatePtrToInt(Constant *C, const Type *DestTy) const {
198    return CreateCast(Instruction::PtrToInt, C, DestTy);
199  }
200  Constant *CreateZExtOrBitCast(Constant *C, const Type *DestTy) const {
201    if (C->getType() == DestTy)
202      return C; // avoid calling Fold
203    return Fold(ConstantExpr::getZExtOrBitCast(C, DestTy));
204  }
205  Constant *CreateSExtOrBitCast(Constant *C, const Type *DestTy) const {
206    if (C->getType() == DestTy)
207      return C; // avoid calling Fold
208    return Fold(ConstantExpr::getSExtOrBitCast(C, DestTy));
209  }
210  Constant *CreateTruncOrBitCast(Constant *C, const Type *DestTy) const {
211    if (C->getType() == DestTy)
212      return C; // avoid calling Fold
213    return Fold(ConstantExpr::getTruncOrBitCast(C, DestTy));
214  }
215
216  //===--------------------------------------------------------------------===//
217  // Compare Instructions
218  //===--------------------------------------------------------------------===//
219
220  Constant *CreateICmp(CmpInst::Predicate P, Constant *LHS,
221                       Constant *RHS) const {
222    return Fold(ConstantExpr::getCompare(P, LHS, RHS));
223  }
224  Constant *CreateFCmp(CmpInst::Predicate P, Constant *LHS,
225                       Constant *RHS) const {
226    return Fold(ConstantExpr::getCompare(P, LHS, RHS));
227  }
228
229  //===--------------------------------------------------------------------===//
230  // Other Instructions
231  //===--------------------------------------------------------------------===//
232
233  Constant *CreateSelect(Constant *C, Constant *True, Constant *False) const {
234    return Fold(ConstantExpr::getSelect(C, True, False));
235  }
236
237  Constant *CreateExtractElement(Constant *Vec, Constant *Idx) const {
238    return Fold(ConstantExpr::getExtractElement(Vec, Idx));
239  }
240
241  Constant *CreateInsertElement(Constant *Vec, Constant *NewElt,
242                                Constant *Idx) const {
243    return Fold(ConstantExpr::getInsertElement(Vec, NewElt, Idx));
244  }
245
246  Constant *CreateShuffleVector(Constant *V1, Constant *V2,
247                                Constant *Mask) const {
248    return Fold(ConstantExpr::getShuffleVector(V1, V2, Mask));
249  }
250
251  Constant *CreateExtractValue(Constant *Agg, const unsigned *IdxList,
252                               unsigned NumIdx) const {
253    return Fold(ConstantExpr::getExtractValue(Agg, IdxList, NumIdx));
254  }
255
256  Constant *CreateInsertValue(Constant *Agg, Constant *Val,
257                              const unsigned *IdxList, unsigned NumIdx) const {
258    return Fold(ConstantExpr::getInsertValue(Agg, Val, IdxList, NumIdx));
259  }
260};
261
262}
263
264#endif
265