[all-commits] [llvm/llvm-project] f925e5: [VPlan] Fix mutating whilst iterating over users i...

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f925e5455415d69df5716a25ceff377989603c0a
      https://github.com/llvm/llvm-project/commit/f925e5455415d69df5716a25ceff377989603c0a
  Author: Luke Lau <luke at igalia.com>
  Date:   2025-01-14 (Tue, 14 Jan 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/test/Transforms/LoopVectorize/RISCV/vectorize-force-tail-with-evl-reverse-load-store.ll

  Log Message:
  -----------
  [VPlan] Fix mutating whilst iterating over users in EVL transform (#122885)

This fixes a miscompilation extracted from 525.x264_r, where we were
failing to update the runtime VF of a VPReverseVectorPointerRecipe.

We were removing a use of VF whilst iterating over the users() iterator,
which messed up the iterator in-flight and caused us to miss some
recipes. This fixes it by copying the users into a SmallVector first.

Fixes #122681
Fixes #122682



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