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Use an integer constant for FABS / FNEG (x86).

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This change will ease refactoring LowerFABS() and LowerFNEG() 
since they have a lot of overlap.

Remove the creation of a floating point constant from an integer
because it's going to be used for a bitwise integer op anyway.

No change to codegen expected, but the verbose comment string
for asm output may change from float values to hex (integer),
depending on whether the constant already exists or not.

Differential Revision: http://reviews.llvm.org/D5052



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216889 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sanjay Patel 2014-09-01 19:01:47 +00:00
parent 73f8eff19e
commit 3c7bd3fbef
1 changed files with 6 additions and 14 deletions
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20
lib/Target/X86/X86ISelLowering.cpp
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@ -12231,13 +12231,9 @@ static SDValue LowerFABS(SDValue Op, SelectionDAG &DAG) {
EltVT = VT.getVectorElementType();
NumElts = VT.getVectorNumElements();
}
Constant *C;
if (EltVT == MVT::f64)
C = ConstantFP::get(*Context, APFloat(APFloat::IEEEdouble,
APInt(64, ~(1ULL << 63))));
else
C = ConstantFP::get(*Context, APFloat(APFloat::IEEEsingle,
APInt(32, ~(1U << 31))));
unsigned EltBits = EltVT.getSizeInBits();
Constant *C = ConstantInt::get(*Context, APInt::getSignedMaxValue(EltBits));
C = ConstantVector::getSplat(NumElts, C);
const TargetLowering &TLI = DAG.getTargetLoweringInfo();
SDValue CPIdx = DAG.getConstantPool(C, TLI.getPointerTy());
@ -12266,13 +12262,9 @@ static SDValue LowerFNEG(SDValue Op, SelectionDAG &DAG) {
EltVT = VT.getVectorElementType();
NumElts = VT.getVectorNumElements();
}
Constant *C;
if (EltVT == MVT::f64)
C = ConstantFP::get(*Context, APFloat(APFloat::IEEEdouble,
APInt(64, 1ULL << 63)));
else
C = ConstantFP::get(*Context, APFloat(APFloat::IEEEsingle,
APInt(32, 1U << 31)));
unsigned EltBits = EltVT.getSizeInBits();
Constant *C = ConstantInt::get(*Context, APInt::getSignBit(EltBits));
C = ConstantVector::getSplat(NumElts, C);
const TargetLowering &TLI = DAG.getTargetLoweringInfo();
SDValue CPIdx = DAG.getConstantPool(C, TLI.getPointerTy());