[all-commits] [llvm/llvm-project] 9d25b2: [InstCombine] Explicitly canonicalize splat shuffl...

[Nikita Popov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9d25b28b9e412b66bb58993dff6646a8f08b8c8c
      https://github.com/llvm/llvm-project/commit/9d25b28b9e412b66bb58993dff6646a8f08b8c8c
  Author: Nikita Popov <npopov at redhat.com>
  Date:   2023-12-18 (Mon, 18 Dec 2023)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
    M llvm/test/Transforms/InstCombine/vec_shuffle.ll
    M llvm/test/Transforms/InstCombine/vscale_extractelement.ll
    M llvm/test/Transforms/InstCombine/vscale_insertelement.ll

  Log Message:
  -----------
  [InstCombine] Explicitly canonicalize splat shuffles to use poison RHS

This is usually handled by demanded elements simplification. However,
as that is not supported for scalable vectors, also handle it
explicitly here.