[PATCH] D110995: [X86] combineMulToPMADDWD - handle any pow2 vector type and split to legal types

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added inline comments.


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Comment at: llvm/test/CodeGen/X86/madd.ll:588-590
+; SSE2-NEXT:    punpcklwd {{.*#+}} xmm2 = xmm2[0],xmm0[0],xmm2[1],xmm0[1],xmm2[2],xmm0[2],xmm2[3],xmm0[3]
+; SSE2-NEXT:    psraw $8, %xmm3
+; SSE2-NEXT:    punpcklwd {{.*#+}} xmm3 = xmm3[0],xmm0[0],xmm3[1],xmm0[1],xmm3[2],xmm0[2],xmm3[3],xmm0[3]
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pengfei wrote:
> Is this another regression?
Yeah - we're still missing some SimplifyDemanded* handling for X86ISD::VPMADDWD - looking at this now


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  https://reviews.llvm.org/D110995/new/

https://reviews.llvm.org/D110995