[all-commits] [llvm/llvm-project] c9eafc: [SLP] Better track MinBWs between vectorization at...

[Ryan Buchner via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c9eafc159e7caeb4fbb81e7af7dfaacc3cbd3e62
      https://github.com/llvm/llvm-project/commit/c9eafc159e7caeb4fbb81e7af7dfaacc3cbd3e62
  Author: Ryan Buchner <rbuchner at qti.qualcomm.com>
  Date:   2026-09-23 (Wed, 23 Sep 2026)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    M llvm/test/Transforms/SLPVectorizer/AArch64/revec-reductions.ll
    M llvm/test/Transforms/SLPVectorizer/X86/subvector-minbitwidth-unsigned-value.ll

  Log Message:
  -----------
  [SLP] Better track MinBWs between vectorization attempts (#224199)

When retrying vectorization with smaller VF, we may be able to vectorize
further where previously gathering was required. This may expose
[s/z]ext instruction that would allow us to optimize via MinBWs. In such
cases, ignore AnalyzedMinBWVals and recompute MinBWs anyways.

Assisted By: Codex



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