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PR2957 ISD::VECTOR_SHUFFLE now stores an array of integers representing the shuffle mask internal to the node, rather than taking a BUILD_VECTOR of ConstantSDNodes as the shuffle mask. A value of -1 represents UNDEF. In addition to eliminating the creation of illegal BUILD_VECTORS just to represent shuffle masks, we are better about canonicalizing the shuffle mask, resulting in substantially better code for some classes of shuffles. llvm-svn: 70225
26 lines
1.3 KiB
LLVM
26 lines
1.3 KiB
LLVM
; RUN: llvm-as < %s | llc -march=x86 -mattr=+sse2 -o %t -f
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; RUN: grep unpcklps %t | count 1
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; RUN: grep pshufd %t | count 1
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; RUN: not grep {sub.*esp} %t
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define void @test(<4 x float>* %res, <4 x float>* %A, <4 x float>* %B) {
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%tmp = load <4 x float>* %B ; <<4 x float>> [#uses=2]
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%tmp3 = load <4 x float>* %A ; <<4 x float>> [#uses=2]
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%tmp.upgrd.1 = extractelement <4 x float> %tmp3, i32 0 ; <float> [#uses=1]
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%tmp7 = extractelement <4 x float> %tmp, i32 0 ; <float> [#uses=1]
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%tmp8 = extractelement <4 x float> %tmp3, i32 1 ; <float> [#uses=1]
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%tmp9 = extractelement <4 x float> %tmp, i32 1 ; <float> [#uses=1]
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%tmp10 = insertelement <4 x float> undef, float %tmp.upgrd.1, i32 0 ; <<4 x float>> [#uses=1]
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%tmp11 = insertelement <4 x float> %tmp10, float %tmp7, i32 1 ; <<4 x float>> [#uses=1]
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%tmp12 = insertelement <4 x float> %tmp11, float %tmp8, i32 2 ; <<4 x float>> [#uses=1]
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%tmp13 = insertelement <4 x float> %tmp12, float %tmp9, i32 3 ; <<4 x float>> [#uses=1]
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store <4 x float> %tmp13, <4 x float>* %res
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ret void
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}
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define void @test2(<4 x float> %X, <4 x float>* %res) {
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%tmp5 = shufflevector <4 x float> %X, <4 x float> undef, <4 x i32> < i32 2, i32 6, i32 3, i32 7 > ; <<4 x float>> [#uses=1]
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store <4 x float> %tmp5, <4 x float>* %res
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ret void
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}
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