1 //===- ConstantHandling.cpp - Implement ConstantHandling.h ----------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the various intrinsic operations, on constant values.
12 //===----------------------------------------------------------------------===//
14 #include "ConstantHandling.h"
15 #include "llvm/Constants.h"
16 #include "llvm/iPHINode.h"
17 #include "llvm/InstrTypes.h"
18 #include "llvm/DerivedTypes.h"
19 #include "llvm/Support/GetElementPtrTypeIterator.h"
23 static unsigned getSize(const Type *Ty) {
24 unsigned S = Ty->getPrimitiveSize();
25 return S ? S : 8; // Treat pointers at 8 bytes
28 Constant *llvm::ConstantFoldCastInstruction(const Constant *V,
30 if (V->getType() == DestTy) return (Constant*)V;
32 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
33 if (CE->getOpcode() == Instruction::Cast) {
34 Constant *Op = const_cast<Constant*>(CE->getOperand(0));
35 // Try to not produce a cast of a cast, which is almost always redundant.
36 if (!Op->getType()->isFloatingPoint() &&
37 !CE->getType()->isFloatingPoint() &&
38 !DestTy->getType()->isFloatingPoint()) {
39 unsigned S1 = getSize(Op->getType()), S2 = getSize(CE->getType());
40 unsigned S3 = getSize(DestTy);
41 if (Op->getType() == DestTy && S3 >= S2)
43 if (S1 >= S2 && S2 >= S3)
44 return ConstantExpr::getCast(Op, DestTy);
45 if (S1 <= S2 && S2 >= S3 && S1 <= S3)
46 return ConstantExpr::getCast(Op, DestTy);
48 } else if (CE->getOpcode() == Instruction::GetElementPtr) {
49 // If all of the indexes in the GEP are null values, there is no pointer
50 // adjustment going on. We might as well cast the source pointer.
51 bool isAllNull = true;
52 for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i)
53 if (!CE->getOperand(i)->isNullValue()) {
58 return ConstantExpr::getCast(CE->getOperand(0), DestTy);
61 ConstRules &Rules = ConstRules::get(V, V);
63 switch (DestTy->getPrimitiveID()) {
64 case Type::BoolTyID: return Rules.castToBool(V);
65 case Type::UByteTyID: return Rules.castToUByte(V);
66 case Type::SByteTyID: return Rules.castToSByte(V);
67 case Type::UShortTyID: return Rules.castToUShort(V);
68 case Type::ShortTyID: return Rules.castToShort(V);
69 case Type::UIntTyID: return Rules.castToUInt(V);
70 case Type::IntTyID: return Rules.castToInt(V);
71 case Type::ULongTyID: return Rules.castToULong(V);
72 case Type::LongTyID: return Rules.castToLong(V);
73 case Type::FloatTyID: return Rules.castToFloat(V);
74 case Type::DoubleTyID: return Rules.castToDouble(V);
75 case Type::PointerTyID:
76 return Rules.castToPointer(V, cast<PointerType>(DestTy));
81 Constant *llvm::ConstantFoldBinaryInstruction(unsigned Opcode,
87 case Instruction::Add: return ConstRules::get(V1, V2).add(V1, V2);
88 case Instruction::Sub: return ConstRules::get(V1, V2).sub(V1, V2);
89 case Instruction::Mul: return ConstRules::get(V1, V2).mul(V1, V2);
90 case Instruction::Div: return ConstRules::get(V1, V2).div(V1, V2);
91 case Instruction::Rem: return ConstRules::get(V1, V2).rem(V1, V2);
92 case Instruction::And: return ConstRules::get(V1, V2).op_and(V1, V2);
93 case Instruction::Or: return ConstRules::get(V1, V2).op_or (V1, V2);
94 case Instruction::Xor: return ConstRules::get(V1, V2).op_xor(V1, V2);
96 case Instruction::Shl: return ConstRules::get(V1, V2).shl(V1, V2);
97 case Instruction::Shr: return ConstRules::get(V1, V2).shr(V1, V2);
99 case Instruction::SetEQ: return ConstRules::get(V1, V2).equalto(V1, V2);
100 case Instruction::SetLT: return ConstRules::get(V1, V2).lessthan(V1, V2);
101 case Instruction::SetGT: return ConstRules::get(V1, V2).lessthan(V2, V1);
102 case Instruction::SetNE: // V1 != V2 === !(V1 == V2)
103 C = ConstRules::get(V1, V2).equalto(V1, V2);
105 case Instruction::SetLE: // V1 <= V2 === !(V2 < V1)
106 C = ConstRules::get(V1, V2).lessthan(V2, V1);
108 case Instruction::SetGE: // V1 >= V2 === !(V1 < V2)
109 C = ConstRules::get(V1, V2).lessthan(V1, V2);
113 // If the folder broke out of the switch statement, invert the boolean
114 // constant value, if it exists, and return it.
116 return ConstantExpr::get(Instruction::Xor, ConstantBool::True, C);
119 Constant *llvm::ConstantFoldGetElementPtr(const Constant *C,
120 const std::vector<Constant*> &IdxList) {
121 if (IdxList.size() == 0 ||
122 (IdxList.size() == 1 && IdxList[0]->isNullValue()))
123 return const_cast<Constant*>(C);
125 // TODO If C is null and all idx's are null, return null of the right type.
128 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(const_cast<Constant*>(C))) {
129 // Combine Indices - If the source pointer to this getelementptr instruction
130 // is a getelementptr instruction, combine the indices of the two
131 // getelementptr instructions into a single instruction.
133 if (CE->getOpcode() == Instruction::GetElementPtr) {
134 const Type *LastTy = 0;
135 for (gep_type_iterator I = gep_type_begin(CE), E = gep_type_end(CE);
139 if ((LastTy && isa<ArrayType>(LastTy)) || IdxList[0]->isNullValue()) {
140 std::vector<Constant*> NewIndices;
141 NewIndices.reserve(IdxList.size() + CE->getNumOperands());
142 for (unsigned i = 1, e = CE->getNumOperands()-1; i != e; ++i)
143 NewIndices.push_back(cast<Constant>(CE->getOperand(i)));
145 // Add the last index of the source with the first index of the new GEP.
146 // Make sure to handle the case when they are actually different types.
147 Constant *Combined = CE->getOperand(CE->getNumOperands()-1);
148 if (!IdxList[0]->isNullValue()) // Otherwise it must be an array
150 ConstantExpr::get(Instruction::Add,
151 ConstantExpr::getCast(IdxList[0], Type::LongTy),
152 ConstantExpr::getCast(Combined, Type::LongTy));
154 NewIndices.push_back(Combined);
155 NewIndices.insert(NewIndices.end(), IdxList.begin()+1, IdxList.end());
156 return ConstantExpr::getGetElementPtr(CE->getOperand(0), NewIndices);
160 // Implement folding of:
161 // int* getelementptr ([2 x int]* cast ([3 x int]* %X to [2 x int]*),
163 // To: int* getelementptr ([3 x int]* %X, long 0, long 0)
165 if (CE->getOpcode() == Instruction::Cast && IdxList.size() > 1 &&
166 IdxList[0]->isNullValue())
167 if (const PointerType *SPT =
168 dyn_cast<PointerType>(CE->getOperand(0)->getType()))
169 if (const ArrayType *SAT = dyn_cast<ArrayType>(SPT->getElementType()))
170 if (const ArrayType *CAT =
171 dyn_cast<ArrayType>(cast<PointerType>(C->getType())->getElementType()))
172 if (CAT->getElementType() == SAT->getElementType())
173 return ConstantExpr::getGetElementPtr(
174 (Constant*)CE->getOperand(0), IdxList);
180 //===----------------------------------------------------------------------===//
181 // TemplateRules Class
182 //===----------------------------------------------------------------------===//
184 // TemplateRules - Implement a subclass of ConstRules that provides all
185 // operations as noops. All other rules classes inherit from this class so
186 // that if functionality is needed in the future, it can simply be added here
187 // and to ConstRules without changing anything else...
189 // This class also provides subclasses with typesafe implementations of methods
190 // so that don't have to do type casting.
192 template<class ArgType, class SubClassName>
193 class TemplateRules : public ConstRules {
195 //===--------------------------------------------------------------------===//
196 // Redirecting functions that cast to the appropriate types
197 //===--------------------------------------------------------------------===//
199 virtual Constant *add(const Constant *V1, const Constant *V2) const {
200 return SubClassName::Add((const ArgType *)V1, (const ArgType *)V2);
202 virtual Constant *sub(const Constant *V1, const Constant *V2) const {
203 return SubClassName::Sub((const ArgType *)V1, (const ArgType *)V2);
205 virtual Constant *mul(const Constant *V1, const Constant *V2) const {
206 return SubClassName::Mul((const ArgType *)V1, (const ArgType *)V2);
208 virtual Constant *div(const Constant *V1, const Constant *V2) const {
209 return SubClassName::Div((const ArgType *)V1, (const ArgType *)V2);
211 virtual Constant *rem(const Constant *V1, const Constant *V2) const {
212 return SubClassName::Rem((const ArgType *)V1, (const ArgType *)V2);
214 virtual Constant *op_and(const Constant *V1, const Constant *V2) const {
215 return SubClassName::And((const ArgType *)V1, (const ArgType *)V2);
217 virtual Constant *op_or(const Constant *V1, const Constant *V2) const {
218 return SubClassName::Or((const ArgType *)V1, (const ArgType *)V2);
220 virtual Constant *op_xor(const Constant *V1, const Constant *V2) const {
221 return SubClassName::Xor((const ArgType *)V1, (const ArgType *)V2);
223 virtual Constant *shl(const Constant *V1, const Constant *V2) const {
224 return SubClassName::Shl((const ArgType *)V1, (const ArgType *)V2);
226 virtual Constant *shr(const Constant *V1, const Constant *V2) const {
227 return SubClassName::Shr((const ArgType *)V1, (const ArgType *)V2);
230 virtual Constant *lessthan(const Constant *V1, const Constant *V2) const {
231 return SubClassName::LessThan((const ArgType *)V1, (const ArgType *)V2);
233 virtual Constant *equalto(const Constant *V1, const Constant *V2) const {
234 return SubClassName::EqualTo((const ArgType *)V1, (const ArgType *)V2);
237 // Casting operators. ick
238 virtual Constant *castToBool(const Constant *V) const {
239 return SubClassName::CastToBool((const ArgType*)V);
241 virtual Constant *castToSByte(const Constant *V) const {
242 return SubClassName::CastToSByte((const ArgType*)V);
244 virtual Constant *castToUByte(const Constant *V) const {
245 return SubClassName::CastToUByte((const ArgType*)V);
247 virtual Constant *castToShort(const Constant *V) const {
248 return SubClassName::CastToShort((const ArgType*)V);
250 virtual Constant *castToUShort(const Constant *V) const {
251 return SubClassName::CastToUShort((const ArgType*)V);
253 virtual Constant *castToInt(const Constant *V) const {
254 return SubClassName::CastToInt((const ArgType*)V);
256 virtual Constant *castToUInt(const Constant *V) const {
257 return SubClassName::CastToUInt((const ArgType*)V);
259 virtual Constant *castToLong(const Constant *V) const {
260 return SubClassName::CastToLong((const ArgType*)V);
262 virtual Constant *castToULong(const Constant *V) const {
263 return SubClassName::CastToULong((const ArgType*)V);
265 virtual Constant *castToFloat(const Constant *V) const {
266 return SubClassName::CastToFloat((const ArgType*)V);
268 virtual Constant *castToDouble(const Constant *V) const {
269 return SubClassName::CastToDouble((const ArgType*)V);
271 virtual Constant *castToPointer(const Constant *V,
272 const PointerType *Ty) const {
273 return SubClassName::CastToPointer((const ArgType*)V, Ty);
276 //===--------------------------------------------------------------------===//
277 // Default "noop" implementations
278 //===--------------------------------------------------------------------===//
280 static Constant *Add(const ArgType *V1, const ArgType *V2) { return 0; }
281 static Constant *Sub(const ArgType *V1, const ArgType *V2) { return 0; }
282 static Constant *Mul(const ArgType *V1, const ArgType *V2) { return 0; }
283 static Constant *Div(const ArgType *V1, const ArgType *V2) { return 0; }
284 static Constant *Rem(const ArgType *V1, const ArgType *V2) { return 0; }
285 static Constant *And(const ArgType *V1, const ArgType *V2) { return 0; }
286 static Constant *Or (const ArgType *V1, const ArgType *V2) { return 0; }
287 static Constant *Xor(const ArgType *V1, const ArgType *V2) { return 0; }
288 static Constant *Shl(const ArgType *V1, const ArgType *V2) { return 0; }
289 static Constant *Shr(const ArgType *V1, const ArgType *V2) { return 0; }
290 static Constant *LessThan(const ArgType *V1, const ArgType *V2) {
293 static Constant *EqualTo(const ArgType *V1, const ArgType *V2) {
297 // Casting operators. ick
298 static Constant *CastToBool (const Constant *V) { return 0; }
299 static Constant *CastToSByte (const Constant *V) { return 0; }
300 static Constant *CastToUByte (const Constant *V) { return 0; }
301 static Constant *CastToShort (const Constant *V) { return 0; }
302 static Constant *CastToUShort(const Constant *V) { return 0; }
303 static Constant *CastToInt (const Constant *V) { return 0; }
304 static Constant *CastToUInt (const Constant *V) { return 0; }
305 static Constant *CastToLong (const Constant *V) { return 0; }
306 static Constant *CastToULong (const Constant *V) { return 0; }
307 static Constant *CastToFloat (const Constant *V) { return 0; }
308 static Constant *CastToDouble(const Constant *V) { return 0; }
309 static Constant *CastToPointer(const Constant *,
310 const PointerType *) {return 0;}
315 //===----------------------------------------------------------------------===//
317 //===----------------------------------------------------------------------===//
319 // EmptyRules provides a concrete base class of ConstRules that does nothing
321 struct EmptyRules : public TemplateRules<Constant, EmptyRules> {
322 static Constant *EqualTo(const Constant *V1, const Constant *V2) {
323 if (V1 == V2) return ConstantBool::True;
330 //===----------------------------------------------------------------------===//
332 //===----------------------------------------------------------------------===//
334 // BoolRules provides a concrete base class of ConstRules for the 'bool' type.
336 struct BoolRules : public TemplateRules<ConstantBool, BoolRules> {
338 static Constant *LessThan(const ConstantBool *V1, const ConstantBool *V2){
339 return ConstantBool::get(V1->getValue() < V2->getValue());
342 static Constant *EqualTo(const Constant *V1, const Constant *V2) {
343 return ConstantBool::get(V1 == V2);
346 static Constant *And(const ConstantBool *V1, const ConstantBool *V2) {
347 return ConstantBool::get(V1->getValue() & V2->getValue());
350 static Constant *Or(const ConstantBool *V1, const ConstantBool *V2) {
351 return ConstantBool::get(V1->getValue() | V2->getValue());
354 static Constant *Xor(const ConstantBool *V1, const ConstantBool *V2) {
355 return ConstantBool::get(V1->getValue() ^ V2->getValue());
358 // Casting operators. ick
359 #define DEF_CAST(TYPE, CLASS, CTYPE) \
360 static Constant *CastTo##TYPE (const ConstantBool *V) { \
361 return CLASS::get(Type::TYPE##Ty, (CTYPE)(bool)V->getValue()); \
364 DEF_CAST(Bool , ConstantBool, bool)
365 DEF_CAST(SByte , ConstantSInt, signed char)
366 DEF_CAST(UByte , ConstantUInt, unsigned char)
367 DEF_CAST(Short , ConstantSInt, signed short)
368 DEF_CAST(UShort, ConstantUInt, unsigned short)
369 DEF_CAST(Int , ConstantSInt, signed int)
370 DEF_CAST(UInt , ConstantUInt, unsigned int)
371 DEF_CAST(Long , ConstantSInt, int64_t)
372 DEF_CAST(ULong , ConstantUInt, uint64_t)
373 DEF_CAST(Float , ConstantFP , float)
374 DEF_CAST(Double, ConstantFP , double)
379 //===----------------------------------------------------------------------===//
380 // NullPointerRules Class
381 //===----------------------------------------------------------------------===//
383 // NullPointerRules provides a concrete base class of ConstRules for null
386 struct NullPointerRules : public TemplateRules<ConstantPointerNull,
388 static Constant *EqualTo(const Constant *V1, const Constant *V2) {
389 return ConstantBool::True; // Null pointers are always equal
391 static Constant *CastToBool(const Constant *V) {
392 return ConstantBool::False;
394 static Constant *CastToSByte (const Constant *V) {
395 return ConstantSInt::get(Type::SByteTy, 0);
397 static Constant *CastToUByte (const Constant *V) {
398 return ConstantUInt::get(Type::UByteTy, 0);
400 static Constant *CastToShort (const Constant *V) {
401 return ConstantSInt::get(Type::ShortTy, 0);
403 static Constant *CastToUShort(const Constant *V) {
404 return ConstantUInt::get(Type::UShortTy, 0);
406 static Constant *CastToInt (const Constant *V) {
407 return ConstantSInt::get(Type::IntTy, 0);
409 static Constant *CastToUInt (const Constant *V) {
410 return ConstantUInt::get(Type::UIntTy, 0);
412 static Constant *CastToLong (const Constant *V) {
413 return ConstantSInt::get(Type::LongTy, 0);
415 static Constant *CastToULong (const Constant *V) {
416 return ConstantUInt::get(Type::ULongTy, 0);
418 static Constant *CastToFloat (const Constant *V) {
419 return ConstantFP::get(Type::FloatTy, 0);
421 static Constant *CastToDouble(const Constant *V) {
422 return ConstantFP::get(Type::DoubleTy, 0);
425 static Constant *CastToPointer(const ConstantPointerNull *V,
426 const PointerType *PTy) {
427 return ConstantPointerNull::get(PTy);
432 //===----------------------------------------------------------------------===//
434 //===----------------------------------------------------------------------===//
436 // DirectRules provides a concrete base classes of ConstRules for a variety of
437 // different types. This allows the C++ compiler to automatically generate our
438 // constant handling operations in a typesafe and accurate manner.
440 template<class ConstantClass, class BuiltinType, Type **Ty, class SuperClass>
441 struct DirectRules : public TemplateRules<ConstantClass, SuperClass> {
442 static Constant *Add(const ConstantClass *V1, const ConstantClass *V2) {
443 BuiltinType R = (BuiltinType)V1->getValue() + (BuiltinType)V2->getValue();
444 return ConstantClass::get(*Ty, R);
447 static Constant *Sub(const ConstantClass *V1, const ConstantClass *V2) {
448 BuiltinType R = (BuiltinType)V1->getValue() - (BuiltinType)V2->getValue();
449 return ConstantClass::get(*Ty, R);
452 static Constant *Mul(const ConstantClass *V1, const ConstantClass *V2) {
453 BuiltinType R = (BuiltinType)V1->getValue() * (BuiltinType)V2->getValue();
454 return ConstantClass::get(*Ty, R);
457 static Constant *Div(const ConstantClass *V1, const ConstantClass *V2) {
458 if (V2->isNullValue()) return 0;
459 BuiltinType R = (BuiltinType)V1->getValue() / (BuiltinType)V2->getValue();
460 return ConstantClass::get(*Ty, R);
463 static Constant *LessThan(const ConstantClass *V1, const ConstantClass *V2) {
464 bool R = (BuiltinType)V1->getValue() < (BuiltinType)V2->getValue();
465 return ConstantBool::get(R);
468 static Constant *EqualTo(const ConstantClass *V1, const ConstantClass *V2) {
469 bool R = (BuiltinType)V1->getValue() == (BuiltinType)V2->getValue();
470 return ConstantBool::get(R);
473 static Constant *CastToPointer(const ConstantClass *V,
474 const PointerType *PTy) {
475 if (V->isNullValue()) // Is it a FP or Integral null value?
476 return ConstantPointerNull::get(PTy);
477 return 0; // Can't const prop other types of pointers
480 // Casting operators. ick
481 #define DEF_CAST(TYPE, CLASS, CTYPE) \
482 static Constant *CastTo##TYPE (const ConstantClass *V) { \
483 return CLASS::get(Type::TYPE##Ty, (CTYPE)(BuiltinType)V->getValue()); \
486 DEF_CAST(Bool , ConstantBool, bool)
487 DEF_CAST(SByte , ConstantSInt, signed char)
488 DEF_CAST(UByte , ConstantUInt, unsigned char)
489 DEF_CAST(Short , ConstantSInt, signed short)
490 DEF_CAST(UShort, ConstantUInt, unsigned short)
491 DEF_CAST(Int , ConstantSInt, signed int)
492 DEF_CAST(UInt , ConstantUInt, unsigned int)
493 DEF_CAST(Long , ConstantSInt, int64_t)
494 DEF_CAST(ULong , ConstantUInt, uint64_t)
495 DEF_CAST(Float , ConstantFP , float)
496 DEF_CAST(Double, ConstantFP , double)
501 //===----------------------------------------------------------------------===//
502 // DirectIntRules Class
503 //===----------------------------------------------------------------------===//
505 // DirectIntRules provides implementations of functions that are valid on
506 // integer types, but not all types in general.
508 template <class ConstantClass, class BuiltinType, Type **Ty>
509 struct DirectIntRules
510 : public DirectRules<ConstantClass, BuiltinType, Ty,
511 DirectIntRules<ConstantClass, BuiltinType, Ty> > {
513 static Constant *Div(const ConstantClass *V1, const ConstantClass *V2) {
514 if (V2->isNullValue()) return 0;
515 if (V2->isAllOnesValue() && // MIN_INT / -1
516 (BuiltinType)V1->getValue() == -(BuiltinType)V1->getValue())
518 BuiltinType R = (BuiltinType)V1->getValue() / (BuiltinType)V2->getValue();
519 return ConstantClass::get(*Ty, R);
522 static Constant *Rem(const ConstantClass *V1,
523 const ConstantClass *V2) {
524 if (V2->isNullValue()) return 0; // X / 0
525 if (V2->isAllOnesValue() && // MIN_INT / -1
526 (BuiltinType)V1->getValue() == -(BuiltinType)V1->getValue())
528 BuiltinType R = (BuiltinType)V1->getValue() % (BuiltinType)V2->getValue();
529 return ConstantClass::get(*Ty, R);
532 static Constant *And(const ConstantClass *V1, const ConstantClass *V2) {
533 BuiltinType R = (BuiltinType)V1->getValue() & (BuiltinType)V2->getValue();
534 return ConstantClass::get(*Ty, R);
536 static Constant *Or(const ConstantClass *V1, const ConstantClass *V2) {
537 BuiltinType R = (BuiltinType)V1->getValue() | (BuiltinType)V2->getValue();
538 return ConstantClass::get(*Ty, R);
540 static Constant *Xor(const ConstantClass *V1, const ConstantClass *V2) {
541 BuiltinType R = (BuiltinType)V1->getValue() ^ (BuiltinType)V2->getValue();
542 return ConstantClass::get(*Ty, R);
545 static Constant *Shl(const ConstantClass *V1, const ConstantClass *V2) {
546 BuiltinType R = (BuiltinType)V1->getValue() << (BuiltinType)V2->getValue();
547 return ConstantClass::get(*Ty, R);
550 static Constant *Shr(const ConstantClass *V1, const ConstantClass *V2) {
551 BuiltinType R = (BuiltinType)V1->getValue() >> (BuiltinType)V2->getValue();
552 return ConstantClass::get(*Ty, R);
557 //===----------------------------------------------------------------------===//
558 // DirectFPRules Class
559 //===----------------------------------------------------------------------===//
561 // DirectFPRules provides implementations of functions that are valid on
562 // floating point types, but not all types in general.
564 template <class ConstantClass, class BuiltinType, Type **Ty>
566 : public DirectRules<ConstantClass, BuiltinType, Ty,
567 DirectFPRules<ConstantClass, BuiltinType, Ty> > {
568 static Constant *Rem(const ConstantClass *V1, const ConstantClass *V2) {
569 if (V2->isNullValue()) return 0;
570 BuiltinType Result = std::fmod((BuiltinType)V1->getValue(),
571 (BuiltinType)V2->getValue());
572 return ConstantClass::get(*Ty, Result);
576 ConstRules &ConstRules::get(const Constant *V1, const Constant *V2) {
577 static EmptyRules EmptyR;
578 static BoolRules BoolR;
579 static NullPointerRules NullPointerR;
580 static DirectIntRules<ConstantSInt, signed char , &Type::SByteTy> SByteR;
581 static DirectIntRules<ConstantUInt, unsigned char , &Type::UByteTy> UByteR;
582 static DirectIntRules<ConstantSInt, signed short, &Type::ShortTy> ShortR;
583 static DirectIntRules<ConstantUInt, unsigned short, &Type::UShortTy> UShortR;
584 static DirectIntRules<ConstantSInt, signed int , &Type::IntTy> IntR;
585 static DirectIntRules<ConstantUInt, unsigned int , &Type::UIntTy> UIntR;
586 static DirectIntRules<ConstantSInt, int64_t , &Type::LongTy> LongR;
587 static DirectIntRules<ConstantUInt, uint64_t , &Type::ULongTy> ULongR;
588 static DirectFPRules <ConstantFP , float , &Type::FloatTy> FloatR;
589 static DirectFPRules <ConstantFP , double , &Type::DoubleTy> DoubleR;
591 if (isa<ConstantExpr>(V1) || isa<ConstantExpr>(V2) ||
592 isa<ConstantPointerRef>(V1) || isa<ConstantPointerRef>(V2))
595 switch (V1->getType()->getPrimitiveID()) {
596 default: assert(0 && "Unknown value type for constant folding!");
597 case Type::BoolTyID: return BoolR;
598 case Type::PointerTyID: return NullPointerR;
599 case Type::SByteTyID: return SByteR;
600 case Type::UByteTyID: return UByteR;
601 case Type::ShortTyID: return ShortR;
602 case Type::UShortTyID: return UShortR;
603 case Type::IntTyID: return IntR;
604 case Type::UIntTyID: return UIntR;
605 case Type::LongTyID: return LongR;
606 case Type::ULongTyID: return ULongR;
607 case Type::FloatTyID: return FloatR;
608 case Type::DoubleTyID: return DoubleR;