[all-commits] [llvm/llvm-project] 5903c6: InstCombine: Fold shufflevector(select) and shuffl...

[Matthias Braun via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5903c6af44256e0bba77b7a69d608aa3ccc6a0dd
      https://github.com/llvm/llvm-project/commit/5903c6af44256e0bba77b7a69d608aa3ccc6a0dd
  Author: Matthias Braun <matze at braunis.de>
  Date:   2024-10-28 (Mon, 28 Oct 2024)

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

  Log Message:
  -----------
  InstCombine: Fold shufflevector(select) and shufflevector(phi) (#113746)

- Transform `shufflevector(select(c, x, y), C)` to
  `select(c, shufflevector(x, C), shufflevector(y, C))` by re-using
  the `FoldOpIntoSelect` helper.
- Transform `shufflevector(phi(x, y), C)` to
  `phi(shufflevector(x, C), shufflevector(y, C))` by re-using the
  `foldOpInotPhi` helper.



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