forked from OSchip/llvm-project
[x86] In the new vector shuffle lowering, when trying to do another
layer of tie-breaking sorting, it really helps to check that you're in a tie first. =] Otherwise the whole thing cycles infinitely. Test case added, another one found through fuzz testing. llvm-svn: 218523
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@ -9959,9 +9959,9 @@ static SDValue lowerVectorShuffle(SDValue Op, const X86Subtarget *Subtarget,
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++LowV2Elements;
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else if (M >= 0)
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++LowV1Elements;
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if (LowV2Elements > LowV1Elements)
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if (LowV2Elements > LowV1Elements) {
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return DAG.getCommutedVectorShuffle(*SVOp);
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} else if (LowV2Elements == LowV1Elements) {
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int SumV1Indices = 0, SumV2Indices = 0;
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for (int i = 0, Size = SVOp->getMask().size(); i < Size; ++i)
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if (SVOp->getMask()[i] >= NumElements)
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@ -9971,6 +9971,7 @@ static SDValue lowerVectorShuffle(SDValue Op, const X86Subtarget *Subtarget,
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if (SumV2Indices < SumV1Indices)
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return DAG.getCommutedVectorShuffle(*SVOp);
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}
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}
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// For each vector width, delegate to a specialized lowering routine.
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if (VT.getSizeInBits() == 128)
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@ -669,6 +669,30 @@ define <8 x float> @shuffle_v8f32_c348cda0(<8 x float> %a, <8 x float> %b) {
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ret <8 x float> %shuffle
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}
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define <8 x float> @shuffle_v8f32_f511235a(<8 x float> %a, <8 x float> %b) {
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; AVX1-LABEL: @shuffle_v8f32_f511235a
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; AVX1: # BB#0:
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; AVX1-NEXT: vperm2f128 {{.*}} # ymm2 = ymm0[2,3,0,1]
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; AVX1-NEXT: vpermilps {{.*}} # ymm2 = ymm2[u,1,u,u,6,7,u,u]
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; AVX1-NEXT: vpermilps {{.*}} # ymm0 = ymm0[0,1,1,1,4,5,5,5]
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; AVX1-NEXT: vblendps {{.*}} # ymm0 = ymm0[0],ymm2[1],ymm0[2,3],ymm2[4,5],ymm0[6,7]
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; AVX1-NEXT: vperm2f128 {{.*}} # ymm1 = ymm1[2,3,0,1]
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; AVX1-NEXT: vpermilps {{.*}} # ymm1 = ymm1[3,1,2,2,7,5,6,6]
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; AVX1-NEXT: vblendps {{.*}} # ymm0 = ymm1[0],ymm0[1,2,3,4,5,6],ymm1[7]
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; AVX1-NEXT: retq
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;
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; AVX2-LABEL: @shuffle_v8f32_f511235a
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; AVX2: # BB#0:
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; AVX2-NEXT: vmovaps {{.*}} # ymm2 = <7,u,u,u,u,u,u,2>
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; AVX2-NEXT: vpermps %ymm1, %ymm2, %ymm1
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; AVX2-NEXT: vmovaps {{.*}} # ymm2 = <u,5,1,1,2,3,5,u>
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; AVX2-NEXT: vpermps %ymm0, %ymm2, %ymm0
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; AVX2-NEXT: vblendps {{.*}} # ymm0 = ymm1[0],ymm0[1,2,3,4,5,6],ymm1[7]
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; AVX2-NEXT: retq
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%shuffle = shufflevector <8 x float> %a, <8 x float> %b, <8 x i32> <i32 15, i32 5, i32 1, i32 1, i32 2, i32 3, i32 5, i32 10>
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ret <8 x float> %shuffle
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}
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define <8 x i32> @shuffle_v8i32_00000000(<8 x i32> %a, <8 x i32> %b) {
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; AVX1-LABEL: @shuffle_v8i32_00000000
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; AVX1: # BB#0:
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