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 "llvm/ConstantHandling.h"
15 #include "llvm/iPHINode.h"
16 #include "llvm/InstrTypes.h"
17 #include "llvm/DerivedTypes.h"
18 #include "llvm/Support/GetElementPtrTypeIterator.h"
22 static unsigned getSize(const Type *Ty) {
23 unsigned S = Ty->getPrimitiveSize();
24 return S ? S : 8; // Treat pointers at 8 bytes
27 Constant *llvm::ConstantFoldCastInstruction(const Constant *V,
29 if (V->getType() == DestTy) return (Constant*)V;
31 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
32 if (CE->getOpcode() == Instruction::Cast) {
33 Constant *Op = const_cast<Constant*>(CE->getOperand(0));
34 // Try to not produce a cast of a cast, which is almost always redundant.
35 if (!Op->getType()->isFloatingPoint() &&
36 !CE->getType()->isFloatingPoint() &&
37 !DestTy->getType()->isFloatingPoint()) {
38 unsigned S1 = getSize(Op->getType()), S2 = getSize(CE->getType());
39 unsigned S3 = getSize(DestTy);
40 if (Op->getType() == DestTy && S3 >= S2)
42 if (S1 >= S2 && S2 >= S3)
43 return ConstantExpr::getCast(Op, DestTy);
44 if (S1 <= S2 && S2 >= S3 && S1 <= S3)
45 return ConstantExpr::getCast(Op, DestTy);
47 } else if (CE->getOpcode() == Instruction::GetElementPtr) {
48 // If all of the indexes in the GEP are null values, there is no pointer
49 // adjustment going on. We might as well cast the source pointer.
50 bool isAllNull = true;
51 for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i)
52 if (!CE->getOperand(i)->isNullValue()) {
57 return ConstantExpr::getCast(CE->getOperand(0), DestTy);
60 return ConstRules::get(V, V).castTo(V, DestTy);
63 Constant *llvm::ConstantFoldBinaryInstruction(unsigned Opcode,
69 case Instruction::Add: return ConstRules::get(V1, V2).add(V1, V2);
70 case Instruction::Sub: return ConstRules::get(V1, V2).sub(V1, V2);
71 case Instruction::Mul: return ConstRules::get(V1, V2).mul(V1, V2);
72 case Instruction::Div: return ConstRules::get(V1, V2).div(V1, V2);
73 case Instruction::Rem: return ConstRules::get(V1, V2).rem(V1, V2);
74 case Instruction::And: return ConstRules::get(V1, V2).op_and(V1, V2);
75 case Instruction::Or: return ConstRules::get(V1, V2).op_or (V1, V2);
76 case Instruction::Xor: return ConstRules::get(V1, V2).op_xor(V1, V2);
78 case Instruction::Shl: return ConstRules::get(V1, V2).shl(V1, V2);
79 case Instruction::Shr: return ConstRules::get(V1, V2).shr(V1, V2);
81 case Instruction::SetEQ: return ConstRules::get(V1, V2).equalto(V1, V2);
82 case Instruction::SetLT: return ConstRules::get(V1, V2).lessthan(V1, V2);
83 case Instruction::SetGT: return ConstRules::get(V1, V2).lessthan(V2, V1);
84 case Instruction::SetNE: // V1 != V2 === !(V1 == V2)
85 C = ConstRules::get(V1, V2).equalto(V1, V2);
87 case Instruction::SetLE: // V1 <= V2 === !(V2 < V1)
88 C = ConstRules::get(V1, V2).lessthan(V2, V1);
90 case Instruction::SetGE: // V1 >= V2 === !(V1 < V2)
91 C = ConstRules::get(V1, V2).lessthan(V1, V2);
95 // If the folder broke out of the switch statement, invert the boolean
96 // constant value, if it exists, and return it.
98 return ConstantExpr::get(Instruction::Xor, ConstantBool::True, C);
101 Constant *llvm::ConstantFoldGetElementPtr(const Constant *C,
102 const std::vector<Constant*> &IdxList) {
103 if (IdxList.size() == 0 ||
104 (IdxList.size() == 1 && IdxList[0]->isNullValue()))
105 return const_cast<Constant*>(C);
107 // TODO If C is null and all idx's are null, return null of the right type.
110 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(const_cast<Constant*>(C))) {
111 // Combine Indices - If the source pointer to this getelementptr instruction
112 // is a getelementptr instruction, combine the indices of the two
113 // getelementptr instructions into a single instruction.
115 if (CE->getOpcode() == Instruction::GetElementPtr) {
116 const Type *LastTy = 0;
117 for (gep_type_iterator I = gep_type_begin(CE), E = gep_type_end(CE);
121 if ((LastTy && isa<ArrayType>(LastTy)) || IdxList[0]->isNullValue()) {
122 std::vector<Constant*> NewIndices;
123 NewIndices.reserve(IdxList.size() + CE->getNumOperands());
124 for (unsigned i = 1, e = CE->getNumOperands()-1; i != e; ++i)
125 NewIndices.push_back(cast<Constant>(CE->getOperand(i)));
127 // Add the last index of the source with the first index of the new GEP.
128 // Make sure to handle the case when they are actually different types.
129 Constant *Combined = CE->getOperand(CE->getNumOperands()-1);
130 if (!IdxList[0]->isNullValue()) // Otherwise it must be an array
132 ConstantExpr::get(Instruction::Add,
133 ConstantExpr::getCast(IdxList[0], Type::LongTy),
134 ConstantExpr::getCast(Combined, Type::LongTy));
136 NewIndices.push_back(Combined);
137 NewIndices.insert(NewIndices.end(), IdxList.begin()+1, IdxList.end());
138 return ConstantExpr::getGetElementPtr(CE->getOperand(0), NewIndices);
142 // Implement folding of:
143 // int* getelementptr ([2 x int]* cast ([3 x int]* %X to [2 x int]*),
145 // To: int* getelementptr ([3 x int]* %X, long 0, long 0)
147 if (CE->getOpcode() == Instruction::Cast && IdxList.size() > 1 &&
148 IdxList[0]->isNullValue())
149 if (const PointerType *SPT =
150 dyn_cast<PointerType>(CE->getOperand(0)->getType()))
151 if (const ArrayType *SAT = dyn_cast<ArrayType>(SPT->getElementType()))
152 if (const ArrayType *CAT =
153 dyn_cast<ArrayType>(cast<PointerType>(C->getType())->getElementType()))
154 if (CAT->getElementType() == SAT->getElementType())
155 return ConstantExpr::getGetElementPtr(
156 (Constant*)CE->getOperand(0), IdxList);
162 //===----------------------------------------------------------------------===//
163 // TemplateRules Class
164 //===----------------------------------------------------------------------===//
166 // TemplateRules - Implement a subclass of ConstRules that provides all
167 // operations as noops. All other rules classes inherit from this class so
168 // that if functionality is needed in the future, it can simply be added here
169 // and to ConstRules without changing anything else...
171 // This class also provides subclasses with typesafe implementations of methods
172 // so that don't have to do type casting.
174 template<class ArgType, class SubClassName>
175 class TemplateRules : public ConstRules {
177 //===--------------------------------------------------------------------===//
178 // Redirecting functions that cast to the appropriate types
179 //===--------------------------------------------------------------------===//
181 virtual Constant *add(const Constant *V1, const Constant *V2) const {
182 return SubClassName::Add((const ArgType *)V1, (const ArgType *)V2);
184 virtual Constant *sub(const Constant *V1, const Constant *V2) const {
185 return SubClassName::Sub((const ArgType *)V1, (const ArgType *)V2);
187 virtual Constant *mul(const Constant *V1, const Constant *V2) const {
188 return SubClassName::Mul((const ArgType *)V1, (const ArgType *)V2);
190 virtual Constant *div(const Constant *V1, const Constant *V2) const {
191 return SubClassName::Div((const ArgType *)V1, (const ArgType *)V2);
193 virtual Constant *rem(const Constant *V1, const Constant *V2) const {
194 return SubClassName::Rem((const ArgType *)V1, (const ArgType *)V2);
196 virtual Constant *op_and(const Constant *V1, const Constant *V2) const {
197 return SubClassName::And((const ArgType *)V1, (const ArgType *)V2);
199 virtual Constant *op_or(const Constant *V1, const Constant *V2) const {
200 return SubClassName::Or((const ArgType *)V1, (const ArgType *)V2);
202 virtual Constant *op_xor(const Constant *V1, const Constant *V2) const {
203 return SubClassName::Xor((const ArgType *)V1, (const ArgType *)V2);
205 virtual Constant *shl(const Constant *V1, const Constant *V2) const {
206 return SubClassName::Shl((const ArgType *)V1, (const ArgType *)V2);
208 virtual Constant *shr(const Constant *V1, const Constant *V2) const {
209 return SubClassName::Shr((const ArgType *)V1, (const ArgType *)V2);
212 virtual ConstantBool *lessthan(const Constant *V1,
213 const Constant *V2) const {
214 return SubClassName::LessThan((const ArgType *)V1, (const ArgType *)V2);
216 virtual ConstantBool *equalto(const Constant *V1,
217 const Constant *V2) const {
218 return SubClassName::EqualTo((const ArgType *)V1, (const ArgType *)V2);
221 // Casting operators. ick
222 virtual ConstantBool *castToBool(const Constant *V) const {
223 return SubClassName::CastToBool((const ArgType*)V);
225 virtual ConstantSInt *castToSByte(const Constant *V) const {
226 return SubClassName::CastToSByte((const ArgType*)V);
228 virtual ConstantUInt *castToUByte(const Constant *V) const {
229 return SubClassName::CastToUByte((const ArgType*)V);
231 virtual ConstantSInt *castToShort(const Constant *V) const {
232 return SubClassName::CastToShort((const ArgType*)V);
234 virtual ConstantUInt *castToUShort(const Constant *V) const {
235 return SubClassName::CastToUShort((const ArgType*)V);
237 virtual ConstantSInt *castToInt(const Constant *V) const {
238 return SubClassName::CastToInt((const ArgType*)V);
240 virtual ConstantUInt *castToUInt(const Constant *V) const {
241 return SubClassName::CastToUInt((const ArgType*)V);
243 virtual ConstantSInt *castToLong(const Constant *V) const {
244 return SubClassName::CastToLong((const ArgType*)V);
246 virtual ConstantUInt *castToULong(const Constant *V) const {
247 return SubClassName::CastToULong((const ArgType*)V);
249 virtual ConstantFP *castToFloat(const Constant *V) const {
250 return SubClassName::CastToFloat((const ArgType*)V);
252 virtual ConstantFP *castToDouble(const Constant *V) const {
253 return SubClassName::CastToDouble((const ArgType*)V);
255 virtual Constant *castToPointer(const Constant *V,
256 const PointerType *Ty) const {
257 return SubClassName::CastToPointer((const ArgType*)V, Ty);
260 //===--------------------------------------------------------------------===//
261 // Default "noop" implementations
262 //===--------------------------------------------------------------------===//
264 static Constant *Add(const ArgType *V1, const ArgType *V2) { return 0; }
265 static Constant *Sub(const ArgType *V1, const ArgType *V2) { return 0; }
266 static Constant *Mul(const ArgType *V1, const ArgType *V2) { return 0; }
267 static Constant *Div(const ArgType *V1, const ArgType *V2) { return 0; }
268 static Constant *Rem(const ArgType *V1, const ArgType *V2) { return 0; }
269 static Constant *And(const ArgType *V1, const ArgType *V2) { return 0; }
270 static Constant *Or (const ArgType *V1, const ArgType *V2) { return 0; }
271 static Constant *Xor(const ArgType *V1, const ArgType *V2) { return 0; }
272 static Constant *Shl(const ArgType *V1, const ArgType *V2) { return 0; }
273 static Constant *Shr(const ArgType *V1, const ArgType *V2) { return 0; }
274 static ConstantBool *LessThan(const ArgType *V1, const ArgType *V2) {
277 static ConstantBool *EqualTo(const ArgType *V1, const ArgType *V2) {
281 // Casting operators. ick
282 static ConstantBool *CastToBool (const Constant *V) { return 0; }
283 static ConstantSInt *CastToSByte (const Constant *V) { return 0; }
284 static ConstantUInt *CastToUByte (const Constant *V) { return 0; }
285 static ConstantSInt *CastToShort (const Constant *V) { return 0; }
286 static ConstantUInt *CastToUShort(const Constant *V) { return 0; }
287 static ConstantSInt *CastToInt (const Constant *V) { return 0; }
288 static ConstantUInt *CastToUInt (const Constant *V) { return 0; }
289 static ConstantSInt *CastToLong (const Constant *V) { return 0; }
290 static ConstantUInt *CastToULong (const Constant *V) { return 0; }
291 static ConstantFP *CastToFloat (const Constant *V) { return 0; }
292 static ConstantFP *CastToDouble(const Constant *V) { return 0; }
293 static Constant *CastToPointer(const Constant *,
294 const PointerType *) {return 0;}
299 //===----------------------------------------------------------------------===//
301 //===----------------------------------------------------------------------===//
303 // EmptyRules provides a concrete base class of ConstRules that does nothing
305 struct EmptyRules : public TemplateRules<Constant, EmptyRules> {
306 static ConstantBool *EqualTo(const Constant *V1, const Constant *V2) {
307 if (V1 == V2) return ConstantBool::True;
314 //===----------------------------------------------------------------------===//
316 //===----------------------------------------------------------------------===//
318 // BoolRules provides a concrete base class of ConstRules for the 'bool' type.
320 struct BoolRules : public TemplateRules<ConstantBool, BoolRules> {
322 static ConstantBool *LessThan(const ConstantBool *V1, const ConstantBool *V2){
323 return ConstantBool::get(V1->getValue() < V2->getValue());
326 static ConstantBool *EqualTo(const Constant *V1, const Constant *V2) {
327 return ConstantBool::get(V1 == V2);
330 static Constant *And(const ConstantBool *V1, const ConstantBool *V2) {
331 return ConstantBool::get(V1->getValue() & V2->getValue());
334 static Constant *Or(const ConstantBool *V1, const ConstantBool *V2) {
335 return ConstantBool::get(V1->getValue() | V2->getValue());
338 static Constant *Xor(const ConstantBool *V1, const ConstantBool *V2) {
339 return ConstantBool::get(V1->getValue() ^ V2->getValue());
342 // Casting operators. ick
343 #define DEF_CAST(TYPE, CLASS, CTYPE) \
344 static CLASS *CastTo##TYPE (const ConstantBool *V) { \
345 return CLASS::get(Type::TYPE##Ty, (CTYPE)(bool)V->getValue()); \
348 DEF_CAST(Bool , ConstantBool, bool)
349 DEF_CAST(SByte , ConstantSInt, signed char)
350 DEF_CAST(UByte , ConstantUInt, unsigned char)
351 DEF_CAST(Short , ConstantSInt, signed short)
352 DEF_CAST(UShort, ConstantUInt, unsigned short)
353 DEF_CAST(Int , ConstantSInt, signed int)
354 DEF_CAST(UInt , ConstantUInt, unsigned int)
355 DEF_CAST(Long , ConstantSInt, int64_t)
356 DEF_CAST(ULong , ConstantUInt, uint64_t)
357 DEF_CAST(Float , ConstantFP , float)
358 DEF_CAST(Double, ConstantFP , double)
363 //===----------------------------------------------------------------------===//
364 // NullPointerRules Class
365 //===----------------------------------------------------------------------===//
367 // NullPointerRules provides a concrete base class of ConstRules for null
370 struct NullPointerRules : public TemplateRules<ConstantPointerNull,
372 static ConstantBool *EqualTo(const Constant *V1, const Constant *V2) {
373 return ConstantBool::True; // Null pointers are always equal
375 static ConstantBool *CastToBool (const Constant *V) {
376 return ConstantBool::False;
378 static ConstantSInt *CastToSByte (const Constant *V) {
379 return ConstantSInt::get(Type::SByteTy, 0);
381 static ConstantUInt *CastToUByte (const Constant *V) {
382 return ConstantUInt::get(Type::UByteTy, 0);
384 static ConstantSInt *CastToShort (const Constant *V) {
385 return ConstantSInt::get(Type::ShortTy, 0);
387 static ConstantUInt *CastToUShort(const Constant *V) {
388 return ConstantUInt::get(Type::UShortTy, 0);
390 static ConstantSInt *CastToInt (const Constant *V) {
391 return ConstantSInt::get(Type::IntTy, 0);
393 static ConstantUInt *CastToUInt (const Constant *V) {
394 return ConstantUInt::get(Type::UIntTy, 0);
396 static ConstantSInt *CastToLong (const Constant *V) {
397 return ConstantSInt::get(Type::LongTy, 0);
399 static ConstantUInt *CastToULong (const Constant *V) {
400 return ConstantUInt::get(Type::ULongTy, 0);
402 static ConstantFP *CastToFloat (const Constant *V) {
403 return ConstantFP::get(Type::FloatTy, 0);
405 static ConstantFP *CastToDouble(const Constant *V) {
406 return ConstantFP::get(Type::DoubleTy, 0);
409 static Constant *CastToPointer(const ConstantPointerNull *V,
410 const PointerType *PTy) {
411 return ConstantPointerNull::get(PTy);
416 //===----------------------------------------------------------------------===//
418 //===----------------------------------------------------------------------===//
420 // DirectRules provides a concrete base classes of ConstRules for a variety of
421 // different types. This allows the C++ compiler to automatically generate our
422 // constant handling operations in a typesafe and accurate manner.
424 template<class ConstantClass, class BuiltinType, Type **Ty, class SuperClass>
425 struct DirectRules : public TemplateRules<ConstantClass, SuperClass> {
426 static Constant *Add(const ConstantClass *V1, const ConstantClass *V2) {
427 BuiltinType R = (BuiltinType)V1->getValue() + (BuiltinType)V2->getValue();
428 return ConstantClass::get(*Ty, R);
431 static Constant *Sub(const ConstantClass *V1, const ConstantClass *V2) {
432 BuiltinType R = (BuiltinType)V1->getValue() - (BuiltinType)V2->getValue();
433 return ConstantClass::get(*Ty, R);
436 static Constant *Mul(const ConstantClass *V1, const ConstantClass *V2) {
437 BuiltinType R = (BuiltinType)V1->getValue() * (BuiltinType)V2->getValue();
438 return ConstantClass::get(*Ty, R);
441 static Constant *Div(const ConstantClass *V1, const ConstantClass *V2) {
442 if (V2->isNullValue()) return 0;
443 BuiltinType R = (BuiltinType)V1->getValue() / (BuiltinType)V2->getValue();
444 return ConstantClass::get(*Ty, R);
447 static ConstantBool *LessThan(const ConstantClass *V1,
448 const ConstantClass *V2) {
449 bool R = (BuiltinType)V1->getValue() < (BuiltinType)V2->getValue();
450 return ConstantBool::get(R);
453 static ConstantBool *EqualTo(const ConstantClass *V1,
454 const ConstantClass *V2) {
455 bool R = (BuiltinType)V1->getValue() == (BuiltinType)V2->getValue();
456 return ConstantBool::get(R);
459 static Constant *CastToPointer(const ConstantClass *V,
460 const PointerType *PTy) {
461 if (V->isNullValue()) // Is it a FP or Integral null value?
462 return ConstantPointerNull::get(PTy);
463 return 0; // Can't const prop other types of pointers
466 // Casting operators. ick
467 #define DEF_CAST(TYPE, CLASS, CTYPE) \
468 static CLASS *CastTo##TYPE (const ConstantClass *V) { \
469 return CLASS::get(Type::TYPE##Ty, (CTYPE)(BuiltinType)V->getValue()); \
472 DEF_CAST(Bool , ConstantBool, bool)
473 DEF_CAST(SByte , ConstantSInt, signed char)
474 DEF_CAST(UByte , ConstantUInt, unsigned char)
475 DEF_CAST(Short , ConstantSInt, signed short)
476 DEF_CAST(UShort, ConstantUInt, unsigned short)
477 DEF_CAST(Int , ConstantSInt, signed int)
478 DEF_CAST(UInt , ConstantUInt, unsigned int)
479 DEF_CAST(Long , ConstantSInt, int64_t)
480 DEF_CAST(ULong , ConstantUInt, uint64_t)
481 DEF_CAST(Float , ConstantFP , float)
482 DEF_CAST(Double, ConstantFP , double)
487 //===----------------------------------------------------------------------===//
488 // DirectIntRules Class
489 //===----------------------------------------------------------------------===//
491 // DirectIntRules provides implementations of functions that are valid on
492 // integer types, but not all types in general.
494 template <class ConstantClass, class BuiltinType, Type **Ty>
495 struct DirectIntRules
496 : public DirectRules<ConstantClass, BuiltinType, Ty,
497 DirectIntRules<ConstantClass, BuiltinType, Ty> > {
499 static Constant *Div(const ConstantClass *V1, const ConstantClass *V2) {
500 if (V2->isNullValue()) return 0;
501 if (V2->isAllOnesValue() && // MIN_INT / -1
502 (BuiltinType)V1->getValue() == -(BuiltinType)V1->getValue())
504 BuiltinType R = (BuiltinType)V1->getValue() / (BuiltinType)V2->getValue();
505 return ConstantClass::get(*Ty, R);
508 static Constant *Rem(const ConstantClass *V1,
509 const ConstantClass *V2) {
510 if (V2->isNullValue()) return 0; // X / 0
511 if (V2->isAllOnesValue() && // MIN_INT / -1
512 (BuiltinType)V1->getValue() == -(BuiltinType)V1->getValue())
514 BuiltinType R = (BuiltinType)V1->getValue() % (BuiltinType)V2->getValue();
515 return ConstantClass::get(*Ty, R);
518 static Constant *And(const ConstantClass *V1, const ConstantClass *V2) {
519 BuiltinType R = (BuiltinType)V1->getValue() & (BuiltinType)V2->getValue();
520 return ConstantClass::get(*Ty, R);
522 static Constant *Or(const ConstantClass *V1, const ConstantClass *V2) {
523 BuiltinType R = (BuiltinType)V1->getValue() | (BuiltinType)V2->getValue();
524 return ConstantClass::get(*Ty, R);
526 static Constant *Xor(const ConstantClass *V1, const ConstantClass *V2) {
527 BuiltinType R = (BuiltinType)V1->getValue() ^ (BuiltinType)V2->getValue();
528 return ConstantClass::get(*Ty, R);
531 static Constant *Shl(const ConstantClass *V1, const ConstantClass *V2) {
532 BuiltinType R = (BuiltinType)V1->getValue() << (BuiltinType)V2->getValue();
533 return ConstantClass::get(*Ty, R);
536 static Constant *Shr(const ConstantClass *V1, const ConstantClass *V2) {
537 BuiltinType R = (BuiltinType)V1->getValue() >> (BuiltinType)V2->getValue();
538 return ConstantClass::get(*Ty, R);
543 //===----------------------------------------------------------------------===//
544 // DirectFPRules Class
545 //===----------------------------------------------------------------------===//
547 // DirectFPRules provides implementations of functions that are valid on
548 // floating point types, but not all types in general.
550 template <class ConstantClass, class BuiltinType, Type **Ty>
552 : public DirectRules<ConstantClass, BuiltinType, Ty,
553 DirectFPRules<ConstantClass, BuiltinType, Ty> > {
554 static Constant *Rem(const ConstantClass *V1, const ConstantClass *V2) {
555 if (V2->isNullValue()) return 0;
556 BuiltinType Result = std::fmod((BuiltinType)V1->getValue(),
557 (BuiltinType)V2->getValue());
558 return ConstantClass::get(*Ty, Result);
562 ConstRules &ConstRules::get(const Constant *V1, const Constant *V2) {
563 static EmptyRules EmptyR;
564 static BoolRules BoolR;
565 static NullPointerRules NullPointerR;
566 static DirectIntRules<ConstantSInt, signed char , &Type::SByteTy> SByteR;
567 static DirectIntRules<ConstantUInt, unsigned char , &Type::UByteTy> UByteR;
568 static DirectIntRules<ConstantSInt, signed short, &Type::ShortTy> ShortR;
569 static DirectIntRules<ConstantUInt, unsigned short, &Type::UShortTy> UShortR;
570 static DirectIntRules<ConstantSInt, signed int , &Type::IntTy> IntR;
571 static DirectIntRules<ConstantUInt, unsigned int , &Type::UIntTy> UIntR;
572 static DirectIntRules<ConstantSInt, int64_t , &Type::LongTy> LongR;
573 static DirectIntRules<ConstantUInt, uint64_t , &Type::ULongTy> ULongR;
574 static DirectFPRules <ConstantFP , float , &Type::FloatTy> FloatR;
575 static DirectFPRules <ConstantFP , double , &Type::DoubleTy> DoubleR;
577 if (isa<ConstantExpr>(V1) || isa<ConstantExpr>(V2) ||
578 isa<ConstantPointerRef>(V1) || isa<ConstantPointerRef>(V2))
581 switch (V1->getType()->getPrimitiveID()) {
582 default: assert(0 && "Unknown value type for constant folding!");
583 case Type::BoolTyID: return BoolR;
584 case Type::PointerTyID: return NullPointerR;
585 case Type::SByteTyID: return SByteR;
586 case Type::UByteTyID: return UByteR;
587 case Type::ShortTyID: return ShortR;
588 case Type::UShortTyID: return UShortR;
589 case Type::IntTyID: return IntR;
590 case Type::UIntTyID: return UIntR;
591 case Type::LongTyID: return LongR;
592 case Type::ULongTyID: return ULongR;
593 case Type::FloatTyID: return FloatR;
594 case Type::DoubleTyID: return DoubleR;