[PATCH] [X86][AVX] Fix wrong lowering of VPERM2X128 nodes.

[Andrea Di Biagio]

Hi Michael,

Not sure if this new patch would address your comments.
However, this should be more resilient to potential changes to the vaule of SM_SentinelUndef.

Please let me know what you think.

Thanks again for your time!
-Andrea


http://reviews.llvm.org/D8119

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/avx-vperm2x128.ll
  test/CodeGen/X86/vector-shuffle-512-v8.ll

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