[all-commits] [llvm/llvm-project] ee5e02: [X86] getShuffleCost - recognise concat_vector(X, Y...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ee5e027cc64957c0e18b8c38ce10d4b84314511c
      https://github.com/llvm/llvm-project/commit/ee5e027cc64957c0e18b8c38ce10d4b84314511c
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-03-21 (Thu, 21 Mar 2024)

  Changed paths:
    M llvm/lib/Target/X86/X86TargetTransformInfo.cpp
    M llvm/test/Transforms/PhaseOrdering/X86/pr67803.ll

  Log Message:
  -----------
  [X86] getShuffleCost - recognise concat_vector(X,Y) shuffle as InsertSubvector instead of PermuteTwoSrc

We don't have a concat_vector shuffle kind and improveShuffleKindFromMask won't alter the base type to match it as InsertSubvector.

But since this is how X86 will lower concat_vector anyhow, just recognise it explicitly.

Another step for #67803



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