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

[Simon Pilgrim]

Thanks guys, the final commit had me moving the v4i64 unpack shuffle matching after byte shift detection as it was interfering with single input shuffle matching - otherwise we were creating a zero register for no purpose.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7596

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