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Use the splat index to generate the desired shuffle. Otherwise we

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could only get undefs and the vector shuffle becomes an undef,
generating wrong code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137295 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bruno Cardoso Lopes 2011-08-11 02:49:41 +00:00
parent 586272d67c
commit a5134a0ea3
2 changed files with 14 additions and 4 deletions
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8
lib/Target/X86/X86ISelLowering.cpp
View File

@ -4125,15 +4125,15 @@ static SDValue PromoteVectorToScalarSplat(ShuffleVectorSDNode *SV,
int NumElems = SrcVT.getVectorNumElements();
assert(SrcVT.is256BitVector() && "unknown howto handle vector type");
assert(SV->isSplat() && "shuffle must be a splat");
SmallVector<int, 4> Mask;
for (int i = 0; i < NumElems/2; ++i)
Mask.push_back(SV->getMaskElt(i));
int SplatIdx = SV->getSplatIndex();
const int Mask[4] = { SplatIdx, SplatIdx, SplatIdx, SplatIdx };
EVT SVT = EVT::getVectorVT(*DAG.getContext(), SrcVT.getVectorElementType(),
NumElems/2);
SDValue SV1 = DAG.getVectorShuffle(SVT, dl, V1.getOperand(1),
DAG.getUNDEF(SVT), &Mask[0]);
DAG.getUNDEF(SVT), Mask);
SDValue InsV = Insert128BitVector(DAG.getUNDEF(SrcVT), SV1,
DAG.getConstant(0, MVT::i32), DAG, dl);

10
test/CodeGen/X86/avx-splat.ll
View File

@ -77,3 +77,13 @@ __load_and_broadcast_32.exit1249: ; preds = %load.i1247, %for_ex
ret void
}
; CHECK: vpshufd $0
; CHECK-NEXT: vinsertf128 $1
define <8 x float> @funcF(i32* %ptr) nounwind {
%val = load i32* %ptr, align 4
%ret6 = insertelement <8 x i32> undef, i32 %val, i32 6
%ret7 = insertelement <8 x i32> %ret6, i32 %val, i32 7
%tmp = bitcast <8 x i32> %ret7 to <8 x float>
ret <8 x float> %tmp
}