[all-commits] [llvm/llvm-project] af3c25: [VPlan] Fix iterator invalidation in adjustFixedOr...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: af3c25dc3d871a7665610a819426c31d5eb17a03
      https://github.com/llvm/llvm-project/commit/af3c25dc3d871a7665610a819426c31d5eb17a03
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2023-02-13 (Mon, 13 Feb 2023)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    A llvm/test/Transforms/LoopVectorize/AArch64/first-order-recurrence-fold-tail.ll

  Log Message:
  -----------
  [VPlan] Fix iterator invalidation in adjustFixedOrderRecurrences.

adjustFixedOrderRecurrences may insert instructions after immediately
after the PHI nodes in the block. This invalidates the phis() iterator.
To avoid crashing/accessing invalid recipes, first collect all
first-order recurrence phi recipes.

This should fix a crash reported by @dmgreen after D142589 landed.