[all-commits] [llvm/llvm-project] 5bb2e2: [LV][NFC] Emit remarks when failing to vectorise e...

[David Sherwood via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5bb2e21c30de31871dd01279c13abcfa2c06e75f
      https://github.com/llvm/llvm-project/commit/5bb2e21c30de31871dd01279c13abcfa2c06e75f
  Author: David Sherwood <david.sherwood at arm.com>
  Date:   2026-09-23 (Wed, 23 Sep 2026)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/lib/Transforms/Vectorize/VPlanConstruction.cpp
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.h
    M llvm/test/Transforms/LoopVectorize/early_exit_legality.ll
    M llvm/test/Transforms/LoopVectorize/early_exit_store_legality.ll
    M llvm/unittests/Transforms/Vectorize/VPlanTestBase.h

  Log Message:
  -----------
  [LV][NFC] Emit remarks when failing to vectorise early exit loops (#225078)

I spotted recently that when attempting to compile a function with an
early exit loop we don't emit any remarks when we fail to vectorise due
to possible faulting loads. This PR fixes that and other missing
remarks, plus I've also added missing tests for some cases where we fail
to vectorise early exit loops.

For the remarks, I've used debug information to uniquely identify the
remark and associate it with a particular function.

Tests were assisted by Codex (GPT 5.5)



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