[all-commits] [llvm/llvm-project] 6f13fe: [SLP] Allow non-power-of-2 VF in tryToVectorizeLis...

[Harrison Hao via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6f13fe0710f09dc98772b9ab74f909984a5f6a35
      https://github.com/llvm/llvm-project/commit/6f13fe0710f09dc98772b9ab74f909984a5f6a35
  Author: Harrison Hao <57025411+harrisonGPU at users.noreply.github.com>
  Date:   2026-08-08 (Sat, 08 Aug 2026)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    M llvm/test/Transforms/SLPVectorizer/X86/odd_store.ll
    M llvm/test/Transforms/SLPVectorizer/non-power-of-2-buildvector.ll

  Log Message:
  -----------
  [SLP] Allow non-power-of-2 VF in tryToVectorizeList (#206259)

Non-power-of-2 VF support (-slp-vectorize-non-power-of-2) was wired into
the `load/store/reduction` paths but not into `tryToVectorizeList`, so
`buildvector/insertelement` seeds like <15 x half> were split into
power-of-2 pieces instead of a single vector op.

Consult `isAllowedNonPowerOf2VF()` when computing `MaxVF` and in the
inner
full-vector guard so supported widths are tried. No change unless
`-slp-vectorize-non-power-of-2` is enabled.

https://godbolt.org/z/1b8GebPEW



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