[PATCH] D37357: [x86] eliminate redundant shuffle of horizontal math ops when both inputs are the same

[Sanjay Patel via Phabricator via llvm-commits]

spatel updated this revision to Diff 113535.
spatel marked 2 inline comments as done.
spatel added a comment.

Patch updated:

1. Take ArrayRef by value rather than ref.
2. Add TODO about checking more shuffle masks (h-op matching doesn't currently work for the listed cases, so it probably doesn't make sense to add those unless/until we fix that).


https://reviews.llvm.org/D37357

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/haddsub-shuf.ll

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