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Use fldz and fld1 for long double constants instead of a constant pool load. 

llvm-svn: 46411
This commit is contained in:
Chris Lattner 2008-01-27 06:19:31 +00:00
parent 5e8bf5673b
commit d05d2011d0
1 changed files with 14 additions and 1 deletions
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15
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -455,7 +455,20 @@ X86TargetLowering::X86TargetLowering(TargetMachine &TM)
addRegisterClass(MVT::f80, X86::RFP80RegisterClass);
setOperationAction(ISD::UNDEF, MVT::f80, Expand);
setOperationAction(ISD::FCOPYSIGN, MVT::f80, Expand);
setOperationAction(ISD::ConstantFP, MVT::f80, Expand);
{
setOperationAction(ISD::ConstantFP, MVT::f80, Expand);
APFloat TmpFlt(+0.0);
TmpFlt.convert(APFloat::x87DoubleExtended, APFloat::rmNearestTiesToEven);
addLegalFPImmediate(TmpFlt); // FLD0
TmpFlt.changeSign();
addLegalFPImmediate(TmpFlt); // FLD0/FCHS
APFloat TmpFlt2(+1.0);
TmpFlt2.convert(APFloat::x87DoubleExtended, APFloat::rmNearestTiesToEven);
addLegalFPImmediate(TmpFlt2); // FLD1
TmpFlt2.changeSign();
addLegalFPImmediate(TmpFlt2); // FLD1/FCHS
}
if (!UnsafeFPMath) {
setOperationAction(ISD::FSIN , MVT::f80 , Expand);
setOperationAction(ISD::FCOS , MVT::f80 , Expand);