[PATCH] D14840: [X86] Detect SAD patterns and emit psadbw instructions on X86.

[Cong Hou via llvm-commits]

congh updated this revision to Diff 50490.
congh added a comment.

Update the patch according to Simon's comments.


http://reviews.llvm.org/D14840

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

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