[all-commits] [llvm/llvm-project] 91a3f1: [LV] Add tests with FindLastIV and epilogue vector...

[Florian Hahn via All-commits]

  Branch: refs/heads/release/20.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 91a3f14d9497b761258d9358c31215ac29969dca
      https://github.com/llvm/llvm-project/commit/91a3f14d9497b761258d9358c31215ac29969dca
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-04-15 (Tue, 15 Apr 2025)

  Changed paths:
    A llvm/test/Transforms/LoopVectorize/AArch64/epilog-iv-select-cmp.ll
    M llvm/test/Transforms/LoopVectorize/epilog-iv-select-cmp.ll

  Log Message:
  -----------
  [LV] Add tests with FindLastIV and epilogue vectorization.

Tests for #126836.


  Commit: c5109be53b7eed66ea48c6339e76ca4a5c7f1f65
      https://github.com/llvm/llvm-project/commit/c5109be53b7eed66ea48c6339e76ca4a5c7f1f65
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-04-15 (Tue, 15 Apr 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/test/Transforms/LoopVectorize/AArch64/epilog-iv-select-cmp.ll
    M llvm/test/Transforms/LoopVectorize/epilog-iv-select-cmp.ll

  Log Message:
  -----------
  [LV] Disable epilogue vectorization for FindLastIV if start is poison.

Back-porting properly freezing of the start value during epilogue
vectorization (2bdc1a1337) is non-trivial. For the 20.x release, just
disable epilogue vectorization for FindLastIV reductions where the start
value may be poison or undef.

Fixes #126836.


Compare: https://github.com/llvm/llvm-project/compare/2131242240f7...c5109be53b7e

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