[all-commits] [llvm/llvm-project] 6ba5fc: [X86] lowerShuffleWithVPMOV - support direct lower...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6ba5fc2deedd1a29126ad784bd000974ef139438
      https://github.com/llvm/llvm-project/commit/6ba5fc2deedd1a29126ad784bd000974ef139438
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2022-08-11 (Thu, 11 Aug 2022)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/avx512-trunc.ll
    M llvm/test/CodeGen/X86/avx512fp16-cvt-ph-w-vl-intrinsics.ll
    M llvm/test/CodeGen/X86/vector-interleaved-load-i16-stride-2.ll
    M llvm/test/CodeGen/X86/vector-interleaved-load-i16-stride-4.ll
    M llvm/test/CodeGen/X86/vector-rotate-128.ll

  Log Message:
  -----------
  [X86] lowerShuffleWithVPMOV - support direct lowering to VPMOV on VLX targets

lowerShuffleWithVPMOV currently only matches shuffle(truncate(x)) patterns, but on VLX targets the truncate isn't usually necessary to make the VPMOV node worthwhile (as we're only targetting v16i8/v8i16 shuffles we're almost always ending up with a PSHUFB node instead). PACKSS/PACKUS are still preferred vs VPMOV due to their lower uop count.

Fixes the remaining regression from the fixes in rG293899c64b75