[all-commits] [llvm/llvm-project] c75778: [X86] lowerShuffleAsDecomposedShuffleMerge - try t...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c757780c62abaf8826b1af200f47b20cdb3d7984
      https://github.com/llvm/llvm-project/commit/c757780c62abaf8826b1af200f47b20cdb3d7984
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2022-11-25 (Fri, 25 Nov 2022)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/oddshuffles.ll
    M llvm/test/CodeGen/X86/vector-interleaved-store-i32-stride-6.ll
    M llvm/test/CodeGen/X86/vector-shuffle-128-v4.ll
    M llvm/test/CodeGen/X86/vector-shuffle-256-v8.ll

  Log Message:
  -----------
  [X86] lowerShuffleAsDecomposedShuffleMerge - try to match unpck(permute(x),permute(y)) for v4i32/v2i64 shuffles

We're using lowerShuffleAsPermuteAndUnpack, which can probably be improved to handle 256/512-bit types pretty easily.

First step towards trying to address the poor vector-shuffle-sse4a.ll pre-SSSE3 codegen mentioned on D127115