[PATCH] D20598: [X86] Detect SAD patterns and emit psadbw instructions on X86 redux

[Michael Kuperstein via llvm-commits]

mkuper updated this revision to Diff 58711.
mkuper added a comment.

Got rid of NumConcat.

Regarding the shuffle - I don't see a good way to get rid of it locally. If you have an idea on how to do that, I'll be happy to hear it.
It can probably be cleaned up with a DAGCombine that recognizes the shuffle we get from the extract is a nop (because the only lanes it shuffles around are zero). Are you ok with leaving a fixme, and following up on that separately if we think it's worthwhile?


http://reviews.llvm.org/D20598

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/sad.ll

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