[PATCH] D18441: [X86][XOP] Support for VPPERM shuffle mask decoding

[Simon Pilgrim via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: spatel, silvas, andreadb, delena.
RKSimon added a subscriber: llvm-commits.
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This patch adds support for decoding XOP VPPERM instruction when it represents a basic shuffle.

The mask decoding required the existing MCInstrLowering code to be updated to support binary shuffles - the implementation now matches what is done in X86InstrComments.cpp. This should be useful for some AVX512 binary shuffles (VPERMT2 etc.) as well.

Split off from D18189

Repository:
  rL LLVM

http://reviews.llvm.org/D18441

Files:
  lib/Target/X86/X86MCInstLower.cpp
  lib/Target/X86/X86ShuffleDecodeConstantPool.cpp
  lib/Target/X86/X86ShuffleDecodeConstantPool.h
  test/CodeGen/X86/vector-shuffle-combining-xop.ll

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