1 //===- ConstantHandling.cpp - Implement ConstantHandling.h ----------------===//
3 // This file implements the various intrinsic operations, on constant values.
5 //===----------------------------------------------------------------------===//
7 #include "llvm/Optimizations/ConstantHandling.h"
11 AnnotationID ConstRules::AID(AnnotationManager::getID("opt::ConstRules",
14 //===----------------------------------------------------------------------===//
15 // TemplateRules Class
16 //===----------------------------------------------------------------------===//
18 // TemplateRules - Implement a subclass of ConstRules that provides all
19 // operations as noops. All other rules classes inherit from this class so
20 // that if functionality is needed in the future, it can simply be added here
21 // and to ConstRules without changing anything else...
23 // This class also provides subclasses with typesafe implementations of methods
24 // so that don't have to do type casting.
26 template<class ArgType, class SubClassName>
27 class TemplateRules : public ConstRules {
29 //===--------------------------------------------------------------------===//
30 // Redirecting functions that cast to the appropriate types
31 //===--------------------------------------------------------------------===//
33 virtual Constant *op_not(const Constant *V) const {
34 return SubClassName::Not((const ArgType *)V);
38 virtual Constant *add(const Constant *V1,
39 const Constant *V2) const {
40 return SubClassName::Add((const ArgType *)V1, (const ArgType *)V2);
43 virtual Constant *sub(const Constant *V1,
44 const Constant *V2) const {
45 return SubClassName::Sub((const ArgType *)V1, (const ArgType *)V2);
48 virtual Constant *mul(const Constant *V1,
49 const Constant *V2) const {
50 return SubClassName::Mul((const ArgType *)V1, (const ArgType *)V2);
53 virtual ConstantBool *lessthan(const Constant *V1,
54 const Constant *V2) const {
55 return SubClassName::LessThan((const ArgType *)V1, (const ArgType *)V2);
58 // Casting operators. ick
59 virtual ConstantBool *castToBool(const Constant *V) const {
60 return SubClassName::CastToBool((const ArgType*)V);
62 virtual ConstantSInt *castToSByte(const Constant *V) const {
63 return SubClassName::CastToSByte((const ArgType*)V);
65 virtual ConstantUInt *castToUByte(const Constant *V) const {
66 return SubClassName::CastToUByte((const ArgType*)V);
68 virtual ConstantSInt *castToShort(const Constant *V) const {
69 return SubClassName::CastToShort((const ArgType*)V);
71 virtual ConstantUInt *castToUShort(const Constant *V) const {
72 return SubClassName::CastToUShort((const ArgType*)V);
74 virtual ConstantSInt *castToInt(const Constant *V) const {
75 return SubClassName::CastToInt((const ArgType*)V);
77 virtual ConstantUInt *castToUInt(const Constant *V) const {
78 return SubClassName::CastToUInt((const ArgType*)V);
80 virtual ConstantSInt *castToLong(const Constant *V) const {
81 return SubClassName::CastToLong((const ArgType*)V);
83 virtual ConstantUInt *castToULong(const Constant *V) const {
84 return SubClassName::CastToULong((const ArgType*)V);
86 virtual ConstantFP *castToFloat(const Constant *V) const {
87 return SubClassName::CastToFloat((const ArgType*)V);
89 virtual ConstantFP *castToDouble(const Constant *V) const {
90 return SubClassName::CastToDouble((const ArgType*)V);
92 virtual ConstantPointer *castToPointer(const Constant *V,
93 const PointerType *Ty) const {
94 return SubClassName::CastToPointer((const ArgType*)V, Ty);
97 //===--------------------------------------------------------------------===//
98 // Default "noop" implementations
99 //===--------------------------------------------------------------------===//
101 inline static Constant *Not(const ArgType *V) { return 0; }
103 inline static Constant *Add(const ArgType *V1, const ArgType *V2) {
106 inline static Constant *Sub(const ArgType *V1, const ArgType *V2) {
109 inline static Constant *Mul(const ArgType *V1, const ArgType *V2) {
112 inline static ConstantBool *LessThan(const ArgType *V1, const ArgType *V2) {
116 // Casting operators. ick
117 inline static ConstantBool *CastToBool (const Constant *V) { return 0; }
118 inline static ConstantSInt *CastToSByte (const Constant *V) { return 0; }
119 inline static ConstantUInt *CastToUByte (const Constant *V) { return 0; }
120 inline static ConstantSInt *CastToShort (const Constant *V) { return 0; }
121 inline static ConstantUInt *CastToUShort(const Constant *V) { return 0; }
122 inline static ConstantSInt *CastToInt (const Constant *V) { return 0; }
123 inline static ConstantUInt *CastToUInt (const Constant *V) { return 0; }
124 inline static ConstantSInt *CastToLong (const Constant *V) { return 0; }
125 inline static ConstantUInt *CastToULong (const Constant *V) { return 0; }
126 inline static ConstantFP *CastToFloat (const Constant *V) { return 0; }
127 inline static ConstantFP *CastToDouble(const Constant *V) { return 0; }
128 inline static ConstantPointer *CastToPointer(const Constant *,
129 const PointerType *) {return 0;}
134 //===----------------------------------------------------------------------===//
136 //===----------------------------------------------------------------------===//
138 // EmptyRules provides a concrete base class of ConstRules that does nothing
140 struct EmptyRules : public TemplateRules<Constant, EmptyRules> {
145 //===----------------------------------------------------------------------===//
147 //===----------------------------------------------------------------------===//
149 // BoolRules provides a concrete base class of ConstRules for the 'bool' type.
151 struct BoolRules : public TemplateRules<ConstantBool, BoolRules> {
153 inline static Constant *Not(const ConstantBool *V) {
154 return ConstantBool::get(!V->getValue());
157 inline static Constant *Or(const ConstantBool *V1,
158 const ConstantBool *V2) {
159 return ConstantBool::get(V1->getValue() | V2->getValue());
162 inline static Constant *And(const ConstantBool *V1,
163 const ConstantBool *V2) {
164 return ConstantBool::get(V1->getValue() & V2->getValue());
169 //===----------------------------------------------------------------------===//
170 // PointerRules Class
171 //===----------------------------------------------------------------------===//
173 // PointerRules provides a concrete base class of ConstRules for pointer types
175 struct PointerRules : public TemplateRules<ConstantPointer, PointerRules> {
176 inline static ConstantBool *CastToBool (const Constant *V) {
177 if (V->isNullValue()) return ConstantBool::False;
178 return 0; // Can't const prop other types of pointers
180 inline static ConstantSInt *CastToSByte (const Constant *V) {
181 if (V->isNullValue()) return ConstantSInt::get(Type::SByteTy, 0);
182 return 0; // Can't const prop other types of pointers
184 inline static ConstantUInt *CastToUByte (const Constant *V) {
185 if (V->isNullValue()) return ConstantUInt::get(Type::UByteTy, 0);
186 return 0; // Can't const prop other types of pointers
188 inline static ConstantSInt *CastToShort (const Constant *V) {
189 if (V->isNullValue()) return ConstantSInt::get(Type::ShortTy, 0);
190 return 0; // Can't const prop other types of pointers
192 inline static ConstantUInt *CastToUShort(const Constant *V) {
193 if (V->isNullValue()) return ConstantUInt::get(Type::UShortTy, 0);
194 return 0; // Can't const prop other types of pointers
196 inline static ConstantSInt *CastToInt (const Constant *V) {
197 if (V->isNullValue()) return ConstantSInt::get(Type::IntTy, 0);
198 return 0; // Can't const prop other types of pointers
200 inline static ConstantUInt *CastToUInt (const Constant *V) {
201 if (V->isNullValue()) return ConstantUInt::get(Type::UIntTy, 0);
202 return 0; // Can't const prop other types of pointers
204 inline static ConstantSInt *CastToLong (const Constant *V) {
205 if (V->isNullValue()) return ConstantSInt::get(Type::LongTy, 0);
206 return 0; // Can't const prop other types of pointers
208 inline static ConstantUInt *CastToULong (const Constant *V) {
209 if (V->isNullValue()) return ConstantUInt::get(Type::ULongTy, 0);
210 return 0; // Can't const prop other types of pointers
212 inline static ConstantFP *CastToFloat (const Constant *V) {
213 if (V->isNullValue()) return ConstantFP::get(Type::FloatTy, 0);
214 return 0; // Can't const prop other types of pointers
216 inline static ConstantFP *CastToDouble(const Constant *V) {
217 if (V->isNullValue()) return ConstantFP::get(Type::DoubleTy, 0);
218 return 0; // Can't const prop other types of pointers
221 inline static ConstantPointer *CastToPointer(const ConstantPointer *V,
222 const PointerType *PTy) {
223 if (V->isNullValue())
224 return ConstantPointerNull::get(PTy);
225 return 0; // Can't const prop other types of pointers
230 //===----------------------------------------------------------------------===//
232 //===----------------------------------------------------------------------===//
234 // DirectRules provides a concrete base classes of ConstRules for a variety of
235 // different types. This allows the C++ compiler to automatically generate our
236 // constant handling operations in a typesafe and accurate manner.
238 template<class ConstantClass, class BuiltinType, Type **Ty>
240 : public TemplateRules<ConstantClass,
241 DirectRules<ConstantClass, BuiltinType, Ty> > {
243 inline static Constant *Not(const ConstantClass *V) {
244 return ConstantClass::get(*Ty, !(BuiltinType)V->getValue());;
247 inline static Constant *Add(const ConstantClass *V1,
248 const ConstantClass *V2) {
249 BuiltinType Result = (BuiltinType)V1->getValue() +
250 (BuiltinType)V2->getValue();
251 return ConstantClass::get(*Ty, Result);
254 inline static Constant *Sub(const ConstantClass *V1,
255 const ConstantClass *V2) {
256 BuiltinType Result = (BuiltinType)V1->getValue() -
257 (BuiltinType)V2->getValue();
258 return ConstantClass::get(*Ty, Result);
261 inline static Constant *Mul(const ConstantClass *V1,
262 const ConstantClass *V2) {
263 BuiltinType Result = (BuiltinType)V1->getValue() *
264 (BuiltinType)V2->getValue();
265 return ConstantClass::get(*Ty, Result);
268 inline static ConstantBool *LessThan(const ConstantClass *V1,
269 const ConstantClass *V2) {
270 bool Result = (BuiltinType)V1->getValue() < (BuiltinType)V2->getValue();
271 return ConstantBool::get(Result);
274 inline static ConstantPointer *CastToPointer(const ConstantClass *V,
275 const PointerType *PTy) {
276 if (V->isNullValue()) // Is it a FP or Integral null value?
277 return ConstantPointerNull::get(PTy);
278 return 0; // Can't const prop other types of pointers
281 // Casting operators. ick
282 #define DEF_CAST(TYPE, CLASS, CTYPE) \
283 inline static CLASS *CastTo##TYPE (const ConstantClass *V) { \
284 return CLASS::get(Type::TYPE##Ty, (CTYPE)(BuiltinType)V->getValue()); \
287 DEF_CAST(Bool , ConstantBool, bool)
288 DEF_CAST(SByte , ConstantSInt, signed char)
289 DEF_CAST(UByte , ConstantUInt, unsigned char)
290 DEF_CAST(Short , ConstantSInt, signed short)
291 DEF_CAST(UShort, ConstantUInt, unsigned short)
292 DEF_CAST(Int , ConstantSInt, signed int)
293 DEF_CAST(UInt , ConstantUInt, unsigned int)
294 DEF_CAST(Long , ConstantSInt, int64_t)
295 DEF_CAST(ULong , ConstantUInt, uint64_t)
296 DEF_CAST(Float , ConstantFP , float)
297 DEF_CAST(Double, ConstantFP , double)
301 //===----------------------------------------------------------------------===//
302 // DirectRules Subclasses
303 //===----------------------------------------------------------------------===//
305 // Given the DirectRules class we can now implement lots of types with little
306 // code. Thank goodness C++ compilers are great at stomping out layers of
307 // templates... can you imagine having to do this all by hand? (/me is lazy :)
310 // ConstRules::find - Return the constant rules that take care of the specified
313 Annotation *ConstRules::find(AnnotationID AID, const Annotable *TyA, void *) {
314 assert(AID == ConstRules::AID && "Bad annotation for factory!");
315 const Type *Ty = cast<Type>((const Value*)TyA);
317 switch (Ty->getPrimitiveID()) {
318 case Type::BoolTyID: return new BoolRules();
319 case Type::PointerTyID: return new PointerRules();
320 case Type::SByteTyID:
321 return new DirectRules<ConstantSInt, signed char , &Type::SByteTy>();
322 case Type::UByteTyID:
323 return new DirectRules<ConstantUInt, unsigned char , &Type::UByteTy>();
324 case Type::ShortTyID:
325 return new DirectRules<ConstantSInt, signed short, &Type::ShortTy>();
326 case Type::UShortTyID:
327 return new DirectRules<ConstantUInt, unsigned short, &Type::UShortTy>();
329 return new DirectRules<ConstantSInt, signed int , &Type::IntTy>();
331 return new DirectRules<ConstantUInt, unsigned int , &Type::UIntTy>();
333 return new DirectRules<ConstantSInt, int64_t , &Type::LongTy>();
334 case Type::ULongTyID:
335 return new DirectRules<ConstantUInt, uint64_t , &Type::ULongTy>();
336 case Type::FloatTyID:
337 return new DirectRules<ConstantFP , float , &Type::FloatTy>();
338 case Type::DoubleTyID:
339 return new DirectRules<ConstantFP , double , &Type::DoubleTy>();
341 return new EmptyRules();
346 } // End namespace opt