[all-commits] [llvm/llvm-project] 70125c: [SLP]Fix crash costing minbw-resized splat gather ...

[Alexey Bataev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 70125c825468688465a4319273efd3c2a0373b91
      https://github.com/llvm/llvm-project/commit/70125c825468688465a4319273efd3c2a0373b91
  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/AArch64/splat-gather-subtree-minbw.ll

  Log Message:
  -----------
  [SLP]Fix crash costing minbw-resized splat gather subtree roots

Splat gather subtree roots have no parent entry, but the min-bitwidth
resize-cost block assumed every non-root node has one and dereferenced
a null user. Charge the resize-back cast to the node's original scalar
type instead, matching the cast emitted when the reusing gather nodes
consume the resized vector.

Fixes https://github.com/llvm/llvm-project/pull/218250#issuecomment-5776455495

Reviewers: 

Pull Request: https://github.com/llvm/llvm-project/pull/225410



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