[PATCH] D26297: [AVX-512] Add support for lowering shuffles to VALIGND/VALIGNQ

[Craig Topper via llvm-commits]

craig.topper created this revision.
craig.topper added reviewers: delena, RKSimon.
craig.topper added subscribers: llvm-commits, Farhana.

VALIGND and VALIGNQ are similar to PALIGNR but instead of working on a 128-bit lane they work on the entire vector register. This change leverages the shuffle rotate detection code used for PALIGNR to detect these cases.

For 128-bit vectors, we favor VALIGND/Q over PALIGNR so that we naturely match the vector element size in case the shuffle is part of a masked operation


https://reviews.llvm.org/D26297

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/vector-shuffle-128-v2.ll
  test/CodeGen/X86/vector-shuffle-128-v4.ll
  test/CodeGen/X86/vector-shuffle-128-v8.ll
  test/CodeGen/X86/vector-shuffle-256-v4.ll
  test/CodeGen/X86/vector-shuffle-256-v8.ll
  test/CodeGen/X86/vector-shuffle-512-v16.ll
  test/CodeGen/X86/vector-shuffle-512-v8.ll
  test/CodeGen/X86/vector-shuffle-v1.ll

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