[all-commits] [llvm/llvm-project] 673c32: [VectorCombine] foldInsExtVectorToShuffle - canoni...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 673c324ae3653cf62d67c5acbee1126e9eb6843e
      https://github.com/llvm/llvm-project/commit/673c324ae3653cf62d67c5acbee1126e9eb6843e
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-12-11 (Wed, 11 Dec 2024)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VectorCombine.cpp
    M llvm/test/Transforms/VectorCombine/X86/extract-binop-inseltpoison.ll
    M llvm/test/Transforms/VectorCombine/X86/extract-binop.ll

  Log Message:
  -----------
  [VectorCombine] foldInsExtVectorToShuffle - canonicalize new shuffle(undef,x) -> shuffle(x,undef).

foldInsExtVectorToShuffle is likely to be inserting into an undef value, so make sure we've canonicalized this to the RHS in the folded shuffle to help further VectorCombine folds.

Minor tweak to help #34072



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