[all-commits] [llvm/llvm-project] 6b5104: [SLP]Fix erasing gathered leftover narrowed reduct...

[Alexey Bataev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6b51046ae30cd78fc4b26605e2dcf3b70c282f4c
      https://github.com/llvm/llvm-project/commit/6b51046ae30cd78fc4b26605e2dcf3b70c282f4c
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2026-09-27 (Sun, 27 Sep 2026)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    A llvm/test/Transforms/SLPVectorizer/X86/narrowed-reduction-gathered-leftover-leaf.ll

  Log Message:
  -----------
  [SLP]Fix erasing gathered leftover narrowed reduction leaves

A leftover narrowed reduction leaf, only gathered in the tree, loses all
users once the tree scalars are erased and is swept as a dead operand,
though the reduction epilogue still uses it. Keep such values alive.

Fixes https://github.com/llvm/llvm-project/pull/224919#issuecomment-5855368565

Reviewers: 

Pull Request: https://github.com/llvm/llvm-project/pull/226782



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