llvm-6502/lib/VMCore/ConstantFold.cpp
Chris Lattner 968ddc921e ConstantHandling moved into VMCore library
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2165 91177308-0d34-0410-b5e6-96231b3b80d8
2002-04-08 20:18:09 +00:00

356 lines
14 KiB
C++

//===- ConstantHandling.cpp - Implement ConstantHandling.h ----------------===//
//
// This file implements the various intrinsic operations, on constant values.
//
//===----------------------------------------------------------------------===//
#include "llvm/ConstantHandling.h"
AnnotationID ConstRules::AID(AnnotationManager::getID("opt::ConstRules",
&ConstRules::find));
//===----------------------------------------------------------------------===//
// TemplateRules Class
//===----------------------------------------------------------------------===//
//
// TemplateRules - Implement a subclass of ConstRules that provides all
// operations as noops. All other rules classes inherit from this class so
// that if functionality is needed in the future, it can simply be added here
// and to ConstRules without changing anything else...
//
// This class also provides subclasses with typesafe implementations of methods
// so that don't have to do type casting.
//
template<class ArgType, class SubClassName>
class TemplateRules : public ConstRules {
//===--------------------------------------------------------------------===//
// Redirecting functions that cast to the appropriate types
//===--------------------------------------------------------------------===//
virtual Constant *op_not(const Constant *V) const {
return SubClassName::Not((const ArgType *)V);
}
virtual Constant *add(const Constant *V1,
const Constant *V2) const {
return SubClassName::Add((const ArgType *)V1, (const ArgType *)V2);
}
virtual Constant *sub(const Constant *V1,
const Constant *V2) const {
return SubClassName::Sub((const ArgType *)V1, (const ArgType *)V2);
}
virtual Constant *mul(const Constant *V1,
const Constant *V2) const {
return SubClassName::Mul((const ArgType *)V1, (const ArgType *)V2);
}
virtual Constant *div(const Constant *V1,
const Constant *V2) const {
return SubClassName::Div((const ArgType *)V1, (const ArgType *)V2);
}
virtual ConstantBool *lessthan(const Constant *V1,
const Constant *V2) const {
return SubClassName::LessThan((const ArgType *)V1, (const ArgType *)V2);
}
// Casting operators. ick
virtual ConstantBool *castToBool(const Constant *V) const {
return SubClassName::CastToBool((const ArgType*)V);
}
virtual ConstantSInt *castToSByte(const Constant *V) const {
return SubClassName::CastToSByte((const ArgType*)V);
}
virtual ConstantUInt *castToUByte(const Constant *V) const {
return SubClassName::CastToUByte((const ArgType*)V);
}
virtual ConstantSInt *castToShort(const Constant *V) const {
return SubClassName::CastToShort((const ArgType*)V);
}
virtual ConstantUInt *castToUShort(const Constant *V) const {
return SubClassName::CastToUShort((const ArgType*)V);
}
virtual ConstantSInt *castToInt(const Constant *V) const {
return SubClassName::CastToInt((const ArgType*)V);
}
virtual ConstantUInt *castToUInt(const Constant *V) const {
return SubClassName::CastToUInt((const ArgType*)V);
}
virtual ConstantSInt *castToLong(const Constant *V) const {
return SubClassName::CastToLong((const ArgType*)V);
}
virtual ConstantUInt *castToULong(const Constant *V) const {
return SubClassName::CastToULong((const ArgType*)V);
}
virtual ConstantFP *castToFloat(const Constant *V) const {
return SubClassName::CastToFloat((const ArgType*)V);
}
virtual ConstantFP *castToDouble(const Constant *V) const {
return SubClassName::CastToDouble((const ArgType*)V);
}
virtual ConstantPointer *castToPointer(const Constant *V,
const PointerType *Ty) const {
return SubClassName::CastToPointer((const ArgType*)V, Ty);
}
//===--------------------------------------------------------------------===//
// Default "noop" implementations
//===--------------------------------------------------------------------===//
inline static Constant *Not(const ArgType *V) { return 0; }
inline static Constant *Add(const ArgType *V1, const ArgType *V2) {
return 0;
}
inline static Constant *Sub(const ArgType *V1, const ArgType *V2) {
return 0;
}
inline static Constant *Mul(const ArgType *V1, const ArgType *V2) {
return 0;
}
inline static Constant *Div(const ArgType *V1, const ArgType *V2) {
return 0;
}
inline static ConstantBool *LessThan(const ArgType *V1, const ArgType *V2) {
return 0;
}
// Casting operators. ick
inline static ConstantBool *CastToBool (const Constant *V) { return 0; }
inline static ConstantSInt *CastToSByte (const Constant *V) { return 0; }
inline static ConstantUInt *CastToUByte (const Constant *V) { return 0; }
inline static ConstantSInt *CastToShort (const Constant *V) { return 0; }
inline static ConstantUInt *CastToUShort(const Constant *V) { return 0; }
inline static ConstantSInt *CastToInt (const Constant *V) { return 0; }
inline static ConstantUInt *CastToUInt (const Constant *V) { return 0; }
inline static ConstantSInt *CastToLong (const Constant *V) { return 0; }
inline static ConstantUInt *CastToULong (const Constant *V) { return 0; }
inline static ConstantFP *CastToFloat (const Constant *V) { return 0; }
inline static ConstantFP *CastToDouble(const Constant *V) { return 0; }
inline static ConstantPointer *CastToPointer(const Constant *,
const PointerType *) {return 0;}
};
//===----------------------------------------------------------------------===//
// EmptyRules Class
//===----------------------------------------------------------------------===//
//
// EmptyRules provides a concrete base class of ConstRules that does nothing
//
struct EmptyRules : public TemplateRules<Constant, EmptyRules> {
};
//===----------------------------------------------------------------------===//
// BoolRules Class
//===----------------------------------------------------------------------===//
//
// BoolRules provides a concrete base class of ConstRules for the 'bool' type.
//
struct BoolRules : public TemplateRules<ConstantBool, BoolRules> {
inline static Constant *Not(const ConstantBool *V) {
return ConstantBool::get(!V->getValue());
}
inline static Constant *Or(const ConstantBool *V1,
const ConstantBool *V2) {
return ConstantBool::get(V1->getValue() | V2->getValue());
}
inline static Constant *And(const ConstantBool *V1,
const ConstantBool *V2) {
return ConstantBool::get(V1->getValue() & V2->getValue());
}
};
//===----------------------------------------------------------------------===//
// PointerRules Class
//===----------------------------------------------------------------------===//
//
// PointerRules provides a concrete base class of ConstRules for pointer types
//
struct PointerRules : public TemplateRules<ConstantPointer, PointerRules> {
inline static ConstantBool *CastToBool (const Constant *V) {
if (V->isNullValue()) return ConstantBool::False;
return 0; // Can't const prop other types of pointers
}
inline static ConstantSInt *CastToSByte (const Constant *V) {
if (V->isNullValue()) return ConstantSInt::get(Type::SByteTy, 0);
return 0; // Can't const prop other types of pointers
}
inline static ConstantUInt *CastToUByte (const Constant *V) {
if (V->isNullValue()) return ConstantUInt::get(Type::UByteTy, 0);
return 0; // Can't const prop other types of pointers
}
inline static ConstantSInt *CastToShort (const Constant *V) {
if (V->isNullValue()) return ConstantSInt::get(Type::ShortTy, 0);
return 0; // Can't const prop other types of pointers
}
inline static ConstantUInt *CastToUShort(const Constant *V) {
if (V->isNullValue()) return ConstantUInt::get(Type::UShortTy, 0);
return 0; // Can't const prop other types of pointers
}
inline static ConstantSInt *CastToInt (const Constant *V) {
if (V->isNullValue()) return ConstantSInt::get(Type::IntTy, 0);
return 0; // Can't const prop other types of pointers
}
inline static ConstantUInt *CastToUInt (const Constant *V) {
if (V->isNullValue()) return ConstantUInt::get(Type::UIntTy, 0);
return 0; // Can't const prop other types of pointers
}
inline static ConstantSInt *CastToLong (const Constant *V) {
if (V->isNullValue()) return ConstantSInt::get(Type::LongTy, 0);
return 0; // Can't const prop other types of pointers
}
inline static ConstantUInt *CastToULong (const Constant *V) {
if (V->isNullValue()) return ConstantUInt::get(Type::ULongTy, 0);
return 0; // Can't const prop other types of pointers
}
inline static ConstantFP *CastToFloat (const Constant *V) {
if (V->isNullValue()) return ConstantFP::get(Type::FloatTy, 0);
return 0; // Can't const prop other types of pointers
}
inline static ConstantFP *CastToDouble(const Constant *V) {
if (V->isNullValue()) return ConstantFP::get(Type::DoubleTy, 0);
return 0; // Can't const prop other types of pointers
}
inline static ConstantPointer *CastToPointer(const ConstantPointer *V,
const PointerType *PTy) {
if (V->isNullValue())
return ConstantPointerNull::get(PTy);
return 0; // Can't const prop other types of pointers
}
};
//===----------------------------------------------------------------------===//
// DirectRules Class
//===----------------------------------------------------------------------===//
//
// DirectRules provides a concrete base classes of ConstRules for a variety of
// different types. This allows the C++ compiler to automatically generate our
// constant handling operations in a typesafe and accurate manner.
//
template<class ConstantClass, class BuiltinType, Type **Ty>
struct DirectRules
: public TemplateRules<ConstantClass,
DirectRules<ConstantClass, BuiltinType, Ty> > {
inline static Constant *Not(const ConstantClass *V) {
return ConstantClass::get(*Ty, !(BuiltinType)V->getValue());;
}
inline static Constant *Add(const ConstantClass *V1,
const ConstantClass *V2) {
BuiltinType Result = (BuiltinType)V1->getValue() +
(BuiltinType)V2->getValue();
return ConstantClass::get(*Ty, Result);
}
inline static Constant *Sub(const ConstantClass *V1,
const ConstantClass *V2) {
BuiltinType Result = (BuiltinType)V1->getValue() -
(BuiltinType)V2->getValue();
return ConstantClass::get(*Ty, Result);
}
inline static Constant *Mul(const ConstantClass *V1,
const ConstantClass *V2) {
BuiltinType Result = (BuiltinType)V1->getValue() *
(BuiltinType)V2->getValue();
return ConstantClass::get(*Ty, Result);
}
inline static Constant *Div(const ConstantClass *V1,
const ConstantClass *V2) {
BuiltinType Result = (BuiltinType)V1->getValue() /
(BuiltinType)V2->getValue();
return ConstantClass::get(*Ty, Result);
}
inline static ConstantBool *LessThan(const ConstantClass *V1,
const ConstantClass *V2) {
bool Result = (BuiltinType)V1->getValue() < (BuiltinType)V2->getValue();
return ConstantBool::get(Result);
}
inline static ConstantPointer *CastToPointer(const ConstantClass *V,
const PointerType *PTy) {
if (V->isNullValue()) // Is it a FP or Integral null value?
return ConstantPointerNull::get(PTy);
return 0; // Can't const prop other types of pointers
}
// Casting operators. ick
#define DEF_CAST(TYPE, CLASS, CTYPE) \
inline static CLASS *CastTo##TYPE (const ConstantClass *V) { \
return CLASS::get(Type::TYPE##Ty, (CTYPE)(BuiltinType)V->getValue()); \
}
DEF_CAST(Bool , ConstantBool, bool)
DEF_CAST(SByte , ConstantSInt, signed char)
DEF_CAST(UByte , ConstantUInt, unsigned char)
DEF_CAST(Short , ConstantSInt, signed short)
DEF_CAST(UShort, ConstantUInt, unsigned short)
DEF_CAST(Int , ConstantSInt, signed int)
DEF_CAST(UInt , ConstantUInt, unsigned int)
DEF_CAST(Long , ConstantSInt, int64_t)
DEF_CAST(ULong , ConstantUInt, uint64_t)
DEF_CAST(Float , ConstantFP , float)
DEF_CAST(Double, ConstantFP , double)
#undef DEF_CAST
};
//===----------------------------------------------------------------------===//
// DirectRules Subclasses
//===----------------------------------------------------------------------===//
//
// Given the DirectRules class we can now implement lots of types with little
// code. Thank goodness C++ compilers are great at stomping out layers of
// templates... can you imagine having to do this all by hand? (/me is lazy :)
//
// ConstRules::find - Return the constant rules that take care of the specified
// type.
//
Annotation *ConstRules::find(AnnotationID AID, const Annotable *TyA, void *) {
assert(AID == ConstRules::AID && "Bad annotation for factory!");
const Type *Ty = cast<Type>((const Value*)TyA);
switch (Ty->getPrimitiveID()) {
case Type::BoolTyID: return new BoolRules();
case Type::PointerTyID: return new PointerRules();
case Type::SByteTyID:
return new DirectRules<ConstantSInt, signed char , &Type::SByteTy>();
case Type::UByteTyID:
return new DirectRules<ConstantUInt, unsigned char , &Type::UByteTy>();
case Type::ShortTyID:
return new DirectRules<ConstantSInt, signed short, &Type::ShortTy>();
case Type::UShortTyID:
return new DirectRules<ConstantUInt, unsigned short, &Type::UShortTy>();
case Type::IntTyID:
return new DirectRules<ConstantSInt, signed int , &Type::IntTy>();
case Type::UIntTyID:
return new DirectRules<ConstantUInt, unsigned int , &Type::UIntTy>();
case Type::LongTyID:
return new DirectRules<ConstantSInt, int64_t , &Type::LongTy>();
case Type::ULongTyID:
return new DirectRules<ConstantUInt, uint64_t , &Type::ULongTy>();
case Type::FloatTyID:
return new DirectRules<ConstantFP , float , &Type::FloatTy>();
case Type::DoubleTyID:
return new DirectRules<ConstantFP , double , &Type::DoubleTy>();
default:
return new EmptyRules();
}
}