[all-commits] [llvm/llvm-project] 3aa9ae: [VPlan] Collect FOR PHIs before sinking/hoisting r...

[Elio via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3aa9ae2da352db6f5822fdc91a170db5e496be32
      https://github.com/llvm/llvm-project/commit/3aa9ae2da352db6f5822fdc91a170db5e496be32
  Author: Elio <xiongzile at bytedance.com>
  Date:   2026-05-25 (Mon, 25 May 2026)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlanConstruction.cpp
    A llvm/test/Transforms/LoopVectorize/VPlan/for-phi-ordering.ll

  Log Message:
  -----------
  [VPlan] Collect FOR PHIs before sinking/hoisting recurrence users (#194671)

Avoid iterating over HeaderVPBB->phis() while potentially mutating the
underlying VPBasicBlock. Collect all VPFirstOrderRecurrencePHIRecipe
instances first, then process them in a separate loop.

This prevents iterator invalidation when sinking or hoisting recurrence
users, and makes the transformation more robust.

Fixes: https://github.com/llvm/llvm-project/issues/194618
Fixes https://github.com/llvm/llvm-project/issues/198589

---------

Co-authored-by: Zile Xiong <xiongzile99 at gmail.com>



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