[all-commits] [llvm/llvm-project] 4c85a0: [LV] Add scalable vector test showing incorrect mi...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4c85a01758e7f7dbbbe8c2d377864617faf8c86b
      https://github.com/llvm/llvm-project/commit/4c85a01758e7f7dbbbe8c2d377864617faf8c86b
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2022-07-15 (Fri, 15 Jul 2022)

  Changed paths:
    A llvm/test/Transforms/LoopVectorize/AArch64/sve-runtime-check-size-based-threshold.ll

  Log Message:
  -----------
  [LV] Add scalable vector test showing incorrect min-trip count check.

The test shows a case where the minimum trip count check incorrectly
only checks the minimum profitable trip count computed due to runtime
checks. This is incorrect for scalable VFs, because the VF * UF may
exceed the minimum profitable trip count for vscale > 1.

This is the likely reason for
https://lab.llvm.org/buildbot/#/builders/197/builds/2262 failing.