[all-commits] [llvm/llvm-project] 16a357: [X86] combineX86ShufflesRecursively - peek through...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 16a357f6b879c1f70d40c089a0d02b30e8ce0965
      https://github.com/llvm/llvm-project/commit/16a357f6b879c1f70d40c089a0d02b30e8ce0965
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2023-02-07 (Tue, 07 Feb 2023)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/haddsub-undef.ll
    M llvm/test/CodeGen/X86/oddshuffles.ll
    M llvm/test/CodeGen/X86/vector-interleaved-load-i8-stride-7.ll

  Log Message:
  -----------
  [X86] combineX86ShufflesRecursively - peek through insert_subvector(undef, x, 0) vector widening nodes

If the node is inert then just peek through it and canonicalize the shuffle mask to ensure any referenced upper elements are set to undef.