diff options
Diffstat (limited to 'lib/VMCore/ConstantFold.cpp')
| -rw-r--r-- | lib/VMCore/ConstantFold.cpp | 26 |
1 files changed, 9 insertions, 17 deletions
diff --git a/lib/VMCore/ConstantFold.cpp b/lib/VMCore/ConstantFold.cpp index 73ca47a9aa..72077db378 100644 --- a/lib/VMCore/ConstantFold.cpp +++ b/lib/VMCore/ConstantFold.cpp @@ -209,25 +209,17 @@ Constant *llvm::ConstantFoldCastInstruction(unsigned opc, const Constant *V, return ConstantInt::get(DestTy, 0); return 0; // Other pointer types cannot be casted case Instruction::UIToFP: - if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) { - double d = CI->getValue().roundToDouble(); - if (DestTy==Type::FloatTy) - return ConstantFP::get(DestTy, APFloat((float)d)); - else if (DestTy==Type::DoubleTy) - return ConstantFP::get(DestTy, APFloat(d)); - else - return 0; // FIXME do this for long double - } - return 0; case Instruction::SIToFP: if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) { - double d = CI->getValue().signedRoundToDouble(); - if (DestTy==Type::FloatTy) - return ConstantFP::get(DestTy, APFloat((float)d)); - else if (DestTy==Type::DoubleTy) - return ConstantFP::get(DestTy, APFloat(d)); - else - return 0; // FIXME do this for long double + APInt api = CI->getValue(); + const uint64_t zero[] = {0, 0}; + uint32_t BitWidth = cast<IntegerType>(SrcTy)->getBitWidth(); + APFloat apf = APFloat(APInt(DestTy->getPrimitiveSizeInBits(), + 2, zero)); + (void)apf.convertFromInteger(api.getRawData(), BitWidth, + opc==Instruction::SIToFP, + APFloat::rmNearestTiesToEven); + return ConstantFP::get(DestTy, apf); } return 0; case Instruction::ZExt: |