maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

Constant fold int-to-long-double conversions; 

use APFloat for int-to-float/double; use
round-to-nearest for these (implementation-defined,
seems to match gcc).

llvm-svn: 42484
This commit is contained in:
Dale Johannesen 2007-09-30 18:19:03 +00:00
parent 28a2c4a9c4
commit 9150652b21
4 changed files with 13 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
View File

@ -3220,7 +3220,7 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
APFloat apf = APFloat(APInt(MVT::getSizeInBits(VT), 2, zero));
uint64_t x = 1ULL << ShiftAmt;
(void)apf.convertFromInteger(&x, MVT::getSizeInBits(NVT), false,
APFloat::rmTowardZero);
APFloat::rmNearestTiesToEven);
Tmp2 = DAG.getConstantFP(apf, VT);
Tmp3 = DAG.getSetCC(TLI.getSetCCResultTy(),
Node->getOperand(0), Tmp2, ISD::SETLT);

2
llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
View File

@ -1598,7 +1598,7 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
(void)apf.convertFromInteger(&Val,
MVT::getSizeInBits(Operand.getValueType()),
Opcode==ISD::SINT_TO_FP,
APFloat::rmTowardZero);
APFloat::rmNearestTiesToEven);
return getConstantFP(apf, VT);
}
case ISD::BIT_CONVERT:

4
llvm/lib/ExecutionEngine/ExecutionEngine.cpp
View File

@ -398,7 +398,7 @@ GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
APFloat apf = APFloat(APInt(80, 2, zero));
(void)apf.convertFromInteger(GV.IntVal.getRawData(),
GV.IntVal.getBitWidth(), false,
APFloat::rmTowardZero);
APFloat::rmNearestTiesToEven);
GV.IntVal = apf.convertToAPInt();
}
return GV;
@ -414,7 +414,7 @@ GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
APFloat apf = APFloat(APInt(80, 2, zero));
(void)apf.convertFromInteger(GV.IntVal.getRawData(),
GV.IntVal.getBitWidth(), true,
APFloat::rmTowardZero);
APFloat::rmNearestTiesToEven);
GV.IntVal = apf.convertToAPInt();
}
return GV;

26
llvm/lib/VMCore/ConstantFold.cpp
View File

@ -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: