[all-commits] [llvm/llvm-project] cb0299: [SLP]Allow min-VF vectorization of seed-level redu...

[Alexey Bataev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: cb029994abbda52adf1986df5c6198c3e1fff4da
      https://github.com/llvm/llvm-project/commit/cb029994abbda52adf1986df5c6198c3e1fff4da
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2026-09-11 (Fri, 11 Sep 2026)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    M llvm/test/Transforms/PhaseOrdering/X86/fma-reassociate-pairs.ll
    M llvm/test/Transforms/SLPVectorizer/X86/fma-operand-index.ll
    M llvm/test/Transforms/SLPVectorizer/X86/reassociated-fma-reduction.ll
    M llvm/test/Transforms/SLPVectorizer/X86/revectorized_rdx_crash.ll

  Log Message:
  -----------
  [SLP]Allow min-VF vectorization of seed-level reduction groups

Small reduced-value groups of single-use seed-level reductions may
vectorize at VF=2, if the values are used by the reduction operations
only and no scalar leftovers remain. For fadd this replaces the
ordered reduction fallback; for the other kinds trunk leaves such
groups scalar.

Reviewers: RKSimon, bababuck, MrSidims

Pull Request: https://github.com/llvm/llvm-project/pull/222757



To unsubscribe from these emails, change your notification settings at https://github.com/llvm/llvm-project/settings/notifications