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Michael Kuperstein
1f0ddef593
[DagCombine] Improve DAGCombiner BUILD_VECTOR when it has two sources of elements
This partially fixes PR21943. For AVX, we go from: vmovq (%rsi), %xmm0 vmovq (%rdi), %xmm1 vpermilps $-27, %xmm1, %xmm2 ## xmm2 = xmm1[1,1,2,3] vinsertps $16, %xmm2, %xmm1, %xmm1 ## xmm1 = xmm1[0],xmm2[0],xmm1[2,3] vinsertps $32, %xmm0, %xmm1, %xmm1 ## xmm1 = xmm1[0,1],xmm0[0],xmm1[3] vpermilps $-27, %xmm0, %xmm0 ## xmm0 = xmm0[1,1,2,3] vinsertps $48, %xmm0, %xmm1, %xmm0 ## xmm0 = xmm1[0,1,2],xmm0[0] To the expected: vmovq (%rdi), %xmm0 vmovhpd (%rsi), %xmm0, %xmm0 retq Fixing this for AVX2 is still open. Differential Revision: http://reviews.llvm.org/D6749 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224759 91177308-0d34-0410-b5e6-96231b3b80d8
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