[all-commits] [llvm/llvm-project] 1f01cb: [SLP]Fix crash in bool bitmask reduction match aft...

[Alexey Bataev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1f01cb40300e3a76fe0b6b97e0cf1ad36e9b631f
      https://github.com/llvm/llvm-project/commit/1f01cb40300e3a76fe0b6b97e0cf1ad36e9b631f
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2026-09-22 (Tue, 22 Sep 2026)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    A llvm/test/Transforms/SLPVectorizer/X86/narrowed-reduction-leaves-known-bits.ll

  Log Message:
  -----------
  [SLP]Fix crash in bool bitmask reduction match after tree vectorization

The known bits of the narrowed reduction leaves were computed after the
tree vectorization, which drops the operands of the vectorized scalars,
so the analysis dereferenced null operands. Match the bitmask form before
the vectorization and pass the result to the emission.

Fixes #225538

Reviewers: 

Pull Request: https://github.com/llvm/llvm-project/pull/225568



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