[PATCH] D22889: [X86] Match PSADBW in straight-line code

[Michael Kuperstein via llvm-commits]

mkuper created this revision.
mkuper added reviewers: spatel, RKSimon, wmi.
mkuper added a subscriber: llvm-commits.

Up until now, we only had code to match PSADBW patterns similar to what comes out of the loop vectorizer - a partial reduction inside the loop body that gets fed into a horizontal operation in a different block.
This adds support for straight-line patterns, like those generated by the SLP vectorizer.

https://reviews.llvm.org/D22889

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

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