[PATCH] D27220: [X86][SSE] Add support for target shuffle constant folding

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: zvi, mkuper, craig.topper, andreadb, spatel.
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Initial support for target shuffle constant folding in cases where all shuffle inputs are constant. We may be able to relax this and merge shuffles with only some constant inputs in the future.

I've added the helper function getTargetConstantBitsFromNode (based off a similar function in X86ShuffleDecodeConstantPool.cpp) that could be reused for other cases requiring constant vector extraction.


Repository:
  rL LLVM

https://reviews.llvm.org/D27220

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/vector-shuffle-combining-avx.ll
  test/CodeGen/X86/vector-shuffle-combining-avx2.ll
  test/CodeGen/X86/vector-shuffle-combining-ssse3.ll
  test/CodeGen/X86/vector-shuffle-combining-xop.ll
  test/CodeGen/X86/vector-shuffle-mmx.ll
  test/CodeGen/X86/vselect-avx.ll
  test/CodeGen/X86/widen_load-2.ll
  test/CodeGen/X86/widen_shuffle-1.ll

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