[PATCH] [X86][SSE] Generalised unpackl/unpckh shuffle matching

[Simon Pilgrim]

Reduced scope of this to just deal with commuted version of the 64 and 32 bit element shuffles (pre-AVX512) byt adding missing matching patterns.

The core of the problem is that the lowerVectorShuffle canonicalization can't (and shouldn't) be second guessing the importance of undefined lanes and should just sort by the numbers of defined 1st/2nd input lanes. This is a problem for explicit shuffle matching using both inputs, which is just the unpck instructions these days.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7564

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/vector-shuffle-128-v4.ll
  test/CodeGen/X86/vector-shuffle-256-v4.ll
  test/CodeGen/X86/vector-shuffle-256-v8.ll

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