[all-commits] [llvm/llvm-project] 3b46fe: [VPlan] Allow plain active lane mask in LastActive...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3b46feb29499a3a43a166b36ce59bb6d49ec6682
      https://github.com/llvm/llvm-project/commit/3b46feb29499a3a43a166b36ce59bb6d49ec6682
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2026-06-21 (Sun, 21 Jun 2026)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlanVerifier.cpp
    A llvm/test/Transforms/LoopVectorize/vector-loop-backedge-elimination-tail-folding.ll

  Log Message:
  -----------
  [VPlan] Allow plain active lane mask in LastActiveLane verifier. (#204982)

Active lane masks are prefix masks. After simplifying the backedge, we
may end up with an active-lane-mask operand of LastActiveLane that does
not match the header mask predicate.

This fixes a verifier failure for the new test.



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