[PATCH] D19198: [X86][AVX] Generalized matching for target shuffle combines

[Simon Pilgrim via llvm-commits]

RKSimon updated this revision to Diff 56746.
RKSimon added a comment.

Disabled target shuffle combines on 512-bit vector of when VLX is enabled and the combined vector element size is different to the root type of the combine as this would prevent writemasks being reused. I couldn't find an easy way to detect if a writemask was actually used so this restriction may turn out to be too harsh.

Elena - are you happy with this or would you prefer if I reduced this patch to just splitting out the original code (NFC)?


Repository:
  rL LLVM

http://reviews.llvm.org/D19198

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/vector-shuffle-combining-avx.ll
  test/CodeGen/X86/vector-shuffle-combining-avx512bw.ll

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