[PATCH] D11541: [X86][SSE] Use bitmasks instead of shuffles where possible.

[Simon Pilgrim]

RKSimon created this revision.
RKSimon added reviewers: chandlerc, qcolombet, andreadb.
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RKSimon set the repository for this revision to rL LLVM.

Split off from D11518.

VPAND is a lot faster than VPSHUFB and VPBLENDVB - this patch ensures we attempt to lower to a basic bitmask before lowering to the slower byte shuffle/blend instructions.

Repository:
  rL LLVM

http://reviews.llvm.org/D11541

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/vector-shuffle-128-v16.ll
  test/CodeGen/X86/vector-shuffle-256-v32.ll
  test/CodeGen/X86/vector-zext.ll

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