[PATCH] D21495: [X86][SSE] Allow target shuffle combining to match masks with SM_Sentinel values

[Simon Pilgrim via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: qcolombet, ab, spatel, andreadb.
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We currently only allow exact matches of shuffle mask patterns during target shuffle combining.

This patch relaxes this to permit SM_SentinelUndef in the combined shuffle to always be accepted as well as allowing exact matching of the SM_SentinelZero value.

I've adjusted some tests that were requiring exact shuffle masks to now include undef values.

Repository:
  rL LLVM

http://reviews.llvm.org/D21495

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/sse3-avx-addsub-2.ll
  test/CodeGen/X86/vector-shuffle-combining-avx.ll
  test/CodeGen/X86/vector-shuffle-combining-avx512bw.ll
  test/CodeGen/X86/vector-shuffle-combining-ssse3.ll
  test/CodeGen/X86/vector-shuffle-combining-xop.ll

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