[PATCH] [X86][AVX2] vpslldq/vpsrldq byte shifts for AVX2

[Simon Pilgrim]

Hi chandlerc, qcolombet, andreadb,

This patch refactors the existing lowerVectorShuffleAsByteShift function to add support for 256-bit vectors on AVX2 targets.

It also fixes a tablegen issue that prevented the lowering of vpslldq/vpsrldq vec256 instructions.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7596

Files:
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86InstrSSE.td
  test/CodeGen/X86/vector-shuffle-256-v16.ll
  test/CodeGen/X86/vector-shuffle-256-v32.ll
  test/CodeGen/X86/vector-shuffle-256-v4.ll
  test/CodeGen/X86/vector-shuffle-256-v8.ll

EMAIL PREFERENCES
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