[all-commits] [llvm/llvm-project] 6b81cd: [SLP]Fix crash in getReorderingData on all-poison ...

[Alexey Bataev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6b81cdb4d99c23106df7232f45aad7b0eff4e43c
      https://github.com/llvm/llvm-project/commit/6b81cdb4d99c23106df7232f45aad7b0eff4e43c
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2026-04-27 (Mon, 27 Apr 2026)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    A llvm/test/Transforms/SLPVectorizer/X86/identity-reuses-with-poisons.ll

  Log Message:
  -----------
  [SLP]Fix crash in getReorderingData on all-poison reuse-mask slice

When the reuse-shuffle mask is iterated in Sz-sized parts and a part is
entirely PoisonMaskElem, `Val` stays at PoisonMaskElem (-1) and the
subsequent `UsedVals.test(Val)` trips the SmallBitVector OOB assertion.
Bail out of reordering in that case.

Fixes #194315

Reviewers: 

Pull Request: https://github.com/llvm/llvm-project/pull/194392



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