[all-commits] [llvm/llvm-project] 8b96dd: [SLP]Do not reuse transformed nodes in gathers emi...

[Alexey Bataev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8b96ddbf9cb3437ee4e47a9f60dc983a1f2be8d5
      https://github.com/llvm/llvm-project/commit/8b96ddbf9cb3437ee4e47a9f60dc983a1f2be8d5
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2026-09-26 (Sat, 26 Sep 2026)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    A llvm/test/Transforms/SLPVectorizer/X86/trimmed-node-matching-gather-emitted-first.ll

  Log Message:
  -----------
  [SLP]Do not reuse transformed nodes in gathers emitted before their user

Gathers of the users with all scalars used outside the block are emitted
before the user, while the transformed nodes are emitted with the user.
Reusing such a transformed node postponed the gather and moved only the
last instruction of the transformed node buildvector, breaking dominance.

Fixes #226674

Reviewers: 

Pull Request: https://github.com/llvm/llvm-project/pull/226687



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