//===----------------------------------------------------------------------===//
#include "llvm/ConstantHandling.h"
+#include "llvm/iPHINode.h"
+#include <cmath>
AnnotationID ConstRules::AID(AnnotationManager::getID("opt::ConstRules",
&ConstRules::find));
+// ConstantFoldInstruction - Attempt to constant fold the specified instruction.
+// If successful, the constant result is returned, if not, null is returned.
+//
+Constant *ConstantFoldInstruction(Instruction *I) {
+ if (PHINode *PN = dyn_cast<PHINode>(I)) {
+ if (PN->getNumIncomingValues() == 0)
+ return Constant::getNullValue(PN->getType());
+
+ Constant *Result = dyn_cast<Constant>(PN->getIncomingValue(0));
+ if (Result == 0) return 0;
+
+ // Handle PHI nodes specially here...
+ for (unsigned i = 1, e = PN->getNumIncomingValues(); i != e; ++i)
+ if (PN->getIncomingValue(i) != Result)
+ return 0; // Not all the same incoming constants...
+
+ // If we reach here, all incoming values are the same constant.
+ return Result;
+ }
+
+ Constant *Op0 = 0;
+ Constant *Op1 = 0;
+
+ if (I->getNumOperands() != 0) { // Get first operand if it's a constant...
+ Op0 = dyn_cast<Constant>(I->getOperand(0));
+ if (Op0 == 0) return 0; // Not a constant?, can't fold
+
+ if (I->getNumOperands() != 1) { // Get second operand if it's a constant...
+ Op1 = dyn_cast<Constant>(I->getOperand(1));
+ if (Op1 == 0) return 0; // Not a constant?, can't fold
+ }
+ }
+
+ switch (I->getOpcode()) {
+ case Instruction::Cast:
+ return ConstRules::get(*Op0)->castTo(Op0, I->getType());
+ case Instruction::Not: return ~*Op0;
+ case Instruction::Add: return *Op0 + *Op1;
+ case Instruction::Sub: return *Op0 - *Op1;
+ case Instruction::Mul: return *Op0 * *Op1;
+ case Instruction::Div: return *Op0 / *Op1;
+ case Instruction::Rem: return *Op0 % *Op1;
+
+ case Instruction::SetEQ: return *Op0 == *Op1;
+ case Instruction::SetNE: return *Op0 != *Op1;
+ case Instruction::SetLE: return *Op0 <= *Op1;
+ case Instruction::SetGE: return *Op0 >= *Op1;
+ case Instruction::SetLT: return *Op0 < *Op1;
+ case Instruction::SetGT: return *Op0 > *Op1;
+ case Instruction::Shl: return *Op0 << *Op1;
+ case Instruction::Shr: return *Op0 >> *Op1;
+ default:
+ return 0;
+ }
+}
+
+Constant *ConstantFoldCastInstruction(const Constant *V, const Type *DestTy) {
+ return ConstRules::get(*V)->castTo(V, DestTy);
+}
+
+Constant *ConstantFoldUnaryInstruction(unsigned Opcode, const Constant *V) {
+ switch (Opcode) {
+ case Instruction::Not: return ~*V;
+ }
+ return 0;
+}
+
+Constant *ConstantFoldBinaryInstruction(unsigned Opcode, const Constant *V1,
+ const Constant *V2) {
+ switch (Opcode) {
+ case Instruction::Add: return *V1 + *V2;
+ case Instruction::Sub: return *V1 - *V2;
+ case Instruction::Mul: return *V1 * *V2;
+ case Instruction::Div: return *V1 / *V2;
+ case Instruction::Rem: return *V1 % *V2;
+
+ case Instruction::SetEQ: return *V1 == *V2;
+ case Instruction::SetNE: return *V1 != *V2;
+ case Instruction::SetLE: return *V1 <= *V2;
+ case Instruction::SetGE: return *V1 >= *V2;
+ case Instruction::SetLT: return *V1 < *V2;
+ case Instruction::SetGT: return *V1 > *V2;
+ }
+ return 0;
+}
+
+Constant *ConstantFoldShiftInstruction(unsigned Opcode, const Constant *V1,
+ const Constant *V2) {
+ switch (Opcode) {
+ case Instruction::Shl: return *V1 << *V2;
+ case Instruction::Shr: return *V1 >> *V2;
+ default: return 0;
+ }
+}
+
+
//===----------------------------------------------------------------------===//
// TemplateRules Class
//===----------------------------------------------------------------------===//
const Constant *V2) const {
return SubClassName::Div((const ArgType *)V1, (const ArgType *)V2);
}
+ virtual Constant *rem(const Constant *V1,
+ const Constant *V2) const {
+ return SubClassName::Rem((const ArgType *)V1, (const ArgType *)V2);
+ }
+ virtual Constant *shl(const Constant *V1,
+ const Constant *V2) const {
+ return SubClassName::Shl((const ArgType *)V1, (const ArgType *)V2);
+ }
+ virtual Constant *shr(const Constant *V1,
+ const Constant *V2) const {
+ return SubClassName::Shr((const ArgType *)V1, (const ArgType *)V2);
+ }
virtual ConstantBool *lessthan(const Constant *V1,
const Constant *V2) const {
inline static Constant *Div(const ArgType *V1, const ArgType *V2) {
return 0;
}
+ inline static Constant *Rem(const ArgType *V1, const ArgType *V2) {
+ return 0;
+ }
+ inline static Constant *Shl(const ArgType *V1, const ArgType *V2) {
+ return 0;
+ }
+ inline static Constant *Shr(const ArgType *V1, const ArgType *V2) {
+ return 0;
+ }
inline static ConstantBool *LessThan(const ArgType *V1, const ArgType *V2) {
return 0;
}
inline static ConstantPointer *CastToPointer(const ConstantPointer *V,
const PointerType *PTy) {
+ if (V->getType() == PTy)
+ return const_cast<ConstantPointer*>(V); // Allow cast %PTy %ptr to %PTy
if (V->isNullValue())
return ConstantPointerNull::get(PTy);
return 0; // Can't const prop other types of pointers
// 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());;
- }
-
+template<class ConstantClass, class BuiltinType, Type **Ty, class SuperClass>
+struct DirectRules : public TemplateRules<ConstantClass, SuperClass> {
inline static Constant *Add(const ConstantClass *V1,
const ConstantClass *V2) {
BuiltinType Result = (BuiltinType)V1->getValue() +
return ConstantClass::get(*Ty, Result);
}
- inline static Constant *Div(const ConstantClass *V1,
+ inline static Constant *Div(const ConstantClass *V1,
const ConstantClass *V2) {
+ if (V2->isNullValue()) return 0;
BuiltinType Result = (BuiltinType)V1->getValue() /
(BuiltinType)V2->getValue();
return ConstantClass::get(*Ty, Result);
#undef DEF_CAST
};
+
+//===----------------------------------------------------------------------===//
+// DirectIntRules Class
+//===----------------------------------------------------------------------===//
+//
+// DirectIntRules provides implementations of functions that are valid on
+// integer types, but not all types in general.
+//
+template <class ConstantClass, class BuiltinType, Type **Ty>
+struct DirectIntRules
+ : public DirectRules<ConstantClass, BuiltinType, Ty,
+ DirectIntRules<ConstantClass, BuiltinType, Ty> > {
+ inline static Constant *Not(const ConstantClass *V) {
+ return ConstantClass::get(*Ty, ~(BuiltinType)V->getValue());;
+ }
+
+ inline static Constant *Rem(const ConstantClass *V1,
+ const ConstantClass *V2) {
+ if (V2->isNullValue()) return 0;
+ BuiltinType Result = (BuiltinType)V1->getValue() %
+ (BuiltinType)V2->getValue();
+ return ConstantClass::get(*Ty, Result);
+ }
+
+ inline static Constant *Shl(const ConstantClass *V1,
+ const ConstantClass *V2) {
+ BuiltinType Result = (BuiltinType)V1->getValue() <<
+ (BuiltinType)V2->getValue();
+ return ConstantClass::get(*Ty, Result);
+ }
+
+ inline static Constant *Shr(const ConstantClass *V1,
+ const ConstantClass *V2) {
+ BuiltinType Result = (BuiltinType)V1->getValue() >>
+ (BuiltinType)V2->getValue();
+ return ConstantClass::get(*Ty, Result);
+ }
+};
+
+
+//===----------------------------------------------------------------------===//
+// DirectFPRules Class
+//===----------------------------------------------------------------------===//
+//
+// DirectFPRules provides implementations of functions that are valid on
+// floating point types, but not all types in general.
+//
+template <class ConstantClass, class BuiltinType, Type **Ty>
+struct DirectFPRules
+ : public DirectRules<ConstantClass, BuiltinType, Ty,
+ DirectFPRules<ConstantClass, BuiltinType, Ty> > {
+ inline static Constant *Rem(const ConstantClass *V1,
+ const ConstantClass *V2) {
+ if (V2->isNullValue()) return 0;
+ BuiltinType Result = std::fmod((BuiltinType)V1->getValue(),
+ (BuiltinType)V2->getValue());
+ return ConstantClass::get(*Ty, Result);
+ }
+};
+
+
//===----------------------------------------------------------------------===//
// DirectRules Subclasses
//===----------------------------------------------------------------------===//
case Type::BoolTyID: return new BoolRules();
case Type::PointerTyID: return new PointerRules();
case Type::SByteTyID:
- return new DirectRules<ConstantSInt, signed char , &Type::SByteTy>();
+ return new DirectIntRules<ConstantSInt, signed char , &Type::SByteTy>();
case Type::UByteTyID:
- return new DirectRules<ConstantUInt, unsigned char , &Type::UByteTy>();
+ return new DirectIntRules<ConstantUInt, unsigned char , &Type::UByteTy>();
case Type::ShortTyID:
- return new DirectRules<ConstantSInt, signed short, &Type::ShortTy>();
+ return new DirectIntRules<ConstantSInt, signed short, &Type::ShortTy>();
case Type::UShortTyID:
- return new DirectRules<ConstantUInt, unsigned short, &Type::UShortTy>();
+ return new DirectIntRules<ConstantUInt, unsigned short, &Type::UShortTy>();
case Type::IntTyID:
- return new DirectRules<ConstantSInt, signed int , &Type::IntTy>();
+ return new DirectIntRules<ConstantSInt, signed int , &Type::IntTy>();
case Type::UIntTyID:
- return new DirectRules<ConstantUInt, unsigned int , &Type::UIntTy>();
+ return new DirectIntRules<ConstantUInt, unsigned int , &Type::UIntTy>();
case Type::LongTyID:
- return new DirectRules<ConstantSInt, int64_t , &Type::LongTy>();
+ return new DirectIntRules<ConstantSInt, int64_t , &Type::LongTy>();
case Type::ULongTyID:
- return new DirectRules<ConstantUInt, uint64_t , &Type::ULongTy>();
+ return new DirectIntRules<ConstantUInt, uint64_t , &Type::ULongTy>();
case Type::FloatTyID:
- return new DirectRules<ConstantFP , float , &Type::FloatTy>();
+ return new DirectFPRules<ConstantFP , float , &Type::FloatTy>();
case Type::DoubleTyID:
- return new DirectRules<ConstantFP , double , &Type::DoubleTy>();
+ return new DirectFPRules<ConstantFP , double , &Type::DoubleTy>();
default:
return new EmptyRules();
}
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