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Fix some long double issues. 

llvm-svn: 42133
This commit is contained in:
Dale Johannesen 2007-09-19 14:22:58 +00:00
parent d31649bc59
commit f4bad97ea0
1 changed files with 21 additions and 19 deletions
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40
llvm/lib/VMCore/ConstantFold.cpp
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@ -178,30 +178,28 @@ Constant *llvm::ConstantFoldCastInstruction(unsigned opc, const Constant *V,
case Instruction::FPTrunc:
case Instruction::FPExt:
if (const ConstantFP *FPC = dyn_cast<ConstantFP>(V)) {
APFloat Val = FPC->getValueAPF();
Val.convert(DestTy==Type::FloatTy ? APFloat::IEEEsingle :
APFloat::IEEEdouble,
APFloat Val = FPC->getValueAPF();
Val.convert(DestTy == Type::FloatTy ? APFloat::IEEEsingle :
DestTy == Type::DoubleTy ? APFloat::IEEEdouble :
DestTy == Type::X86_FP80Ty ? APFloat::x87DoubleExtended :
DestTy == Type::FP128Ty ? APFloat::IEEEquad :
APFloat::Bogus,
APFloat::rmNearestTiesToEven);
return ConstantFP::get(DestTy, Val);
}
return 0; // Can't fold.
case Instruction::FPToUI:
if (const ConstantFP *FPC = dyn_cast<ConstantFP>(V)) {
APFloat V = FPC->getValueAPF();
bool isDouble = &V.getSemantics()==&APFloat::IEEEdouble;
uint32_t DestBitWidth = cast<IntegerType>(DestTy)->getBitWidth();
APInt Val(APIntOps::RoundDoubleToAPInt(isDouble ? V.convertToDouble() :
(double)V.convertToFloat(), DestBitWidth));
return ConstantInt::get(Val);
}
return 0; // Can't fold.
case Instruction::FPToSI:
if (const ConstantFP *FPC = dyn_cast<ConstantFP>(V)) {
APFloat V = FPC->getValueAPF();
bool isDouble = &V.getSemantics()==&APFloat::IEEEdouble;
uint64_t x[2];
uint32_t DestBitWidth = cast<IntegerType>(DestTy)->getBitWidth();
APInt Val(APIntOps::RoundDoubleToAPInt(isDouble ? V.convertToDouble() :
(double)V.convertToFloat(), DestBitWidth));
APFloat::opStatus status = V.convertToInteger(x, DestBitWidth,
opc==Instruction::FPToSI,
APFloat::rmNearestTiesToEven);
if (status!=APFloat::opOK && status!=APFloat::opInexact)
return 0; // give up
APInt Val(DestBitWidth, 2, x);
return ConstantInt::get(Val);
}
return 0; // Can't fold.
@ -215,11 +213,13 @@ Constant *llvm::ConstantFoldCastInstruction(unsigned opc, const Constant *V,
return 0; // Other pointer types cannot be casted
case Instruction::UIToFP:
if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
double d = CI->getValue().signedRoundToDouble();
if (DestTy==Type::FloatTy)
return ConstantFP::get(DestTy,
APFloat((float)CI->getValue().roundToDouble()));
return ConstantFP::get(DestTy, APFloat((float)d));
else if (DestTy==Type::DoubleTy)
return ConstantFP::get(DestTy, APFloat(d));
else
return ConstantFP::get(DestTy, APFloat(CI->getValue().roundToDouble()));
return 0; // FIXME do this for long double
}
return 0;
case Instruction::SIToFP:
@ -227,8 +227,10 @@ Constant *llvm::ConstantFoldCastInstruction(unsigned opc, const Constant *V,
double d = CI->getValue().signedRoundToDouble();
if (DestTy==Type::FloatTy)
return ConstantFP::get(DestTy, APFloat((float)d));
else
else if (DestTy==Type::DoubleTy)
return ConstantFP::get(DestTy, APFloat(d));
else
return 0; // FIXME do this for long double
}
return 0;
case Instruction::ZExt: