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Add support for lowering fneg when AVX is enabled.

Browse Source 
rdar://10566486


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146625 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chad Rosier 2011-12-15 01:02:25 +00:00
parent 4e5a1ab10b
commit a860b189e4
2 changed files with 19 additions and 11 deletions
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22
lib/Target/X86/X86ISelLowering.cpp
View File

@ -7910,19 +7910,18 @@ SDValue X86TargetLowering::LowerFNEG(SDValue Op, SelectionDAG &DAG) const {
DebugLoc dl = Op.getDebugLoc();
EVT VT = Op.getValueType();
EVT EltVT = VT;
if (VT.isVector())
unsigned NumElts = VT == MVT::f64 ? 2 : 4;
if (VT.isVector()) {
EltVT = VT.getVectorElementType();
std::vector<Constant*> CV;
NumElts = VT.getVectorNumElements();
}
SmallVector<Constant*,8> CV;
if (EltVT == MVT::f64) {
Constant *C = ConstantFP::get(*Context, APFloat(APInt(64, 1ULL << 63)));
CV.push_back(C);
CV.push_back(C);
CV.assign(NumElts, C);
} else {
Constant *C = ConstantFP::get(*Context, APFloat(APInt(32, 1U << 31)));
CV.push_back(C);
CV.push_back(C);
CV.push_back(C);
CV.push_back(C);
CV.assign(NumElts, C);
}
Constant *C = ConstantVector::get(CV);
SDValue CPIdx = DAG.getConstantPool(C, getPointerTy(), 16);
@ -7930,11 +7929,12 @@ SDValue X86TargetLowering::LowerFNEG(SDValue Op, SelectionDAG &DAG) const {
MachinePointerInfo::getConstantPool(),
false, false, false, 16);
if (VT.isVector()) {
MVT XORVT = VT.getSizeInBits() == 128 ? MVT::v2i64 : MVT::v4i64;
return DAG.getNode(ISD::BITCAST, dl, VT,
DAG.getNode(ISD::XOR, dl, MVT::v2i64,
DAG.getNode(ISD::BITCAST, dl, MVT::v2i64,
DAG.getNode(ISD::XOR, dl, XORVT,
DAG.getNode(ISD::BITCAST, dl, XORVT,
Op.getOperand(0)),
DAG.getNode(ISD::BITCAST, dl, MVT::v2i64, Mask)));
DAG.getNode(ISD::BITCAST, dl, XORVT, Mask)));
} else {
return DAG.getNode(X86ISD::FXOR, dl, VT, Op.getOperand(0), Mask);
}

8
test/CodeGen/X86/avx-basic.ll
View File

@ -105,3 +105,11 @@ allocas:
ret <8 x i32> %updatedret.i30.i
}
;;;; Don't crash on fneg
; rdar://10566486
; CHECK: fneg
; CHECK: vxorps
define <16 x float> @fneg(<16 x float> addrspace(1)* nocapture %out) nounwind {
%1 = fsub <16 x float> <float -0.000000e+00, float -0.000000e+00, float -0.000000e+00, float -0.000000e+00, float -0.000000e+00, float -0.000000e+00, float -0.000000e+00, float -0.000000e+00, float -0.000000e+00, float -0.000000e+00, float -0.000000e+00, float -0.000000e+00, float -0.000000e+00, float -0.000000e+00, float -0.000000e+00, float -0.000000e+00>, <float 1.000000e+00, float 1.000000e+00, float 1.000000e+00, float 1.000000e+00, float 1.000000e+00, float 1.000000e+00, float 1.000000e+00, float 1.000000e+00, float 1.000000e+00, float 1.000000e+00, float 1.000000e+00, float 1.000000e+00, float 1.000000e+00, float 1.000000e+00, float 1.000000e+00, float 1.000000e+00>
ret <16 x float> %1
}