[all-commits] [llvm/llvm-project] 37f0f1: [LV] Don't vectorize epilogue with scalable VF if ...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 37f0f10a857dad83dce225408fbd3c269b15bede
      https://github.com/llvm/llvm-project/commit/37f0f10a857dad83dce225408fbd3c269b15bede
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-07-22 (Tue, 22 Jul 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/test/Transforms/LoopVectorize/AArch64/check-prof-info.ll
    A llvm/test/Transforms/LoopVectorize/AArch64/interleave-with-gaps.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/partial-reduce-dot-product-epilogue.ll
    R llvm/test/Transforms/LoopVectorize/AArch64/sve-epilog-vect-no-remaining-iterations.ll

  Log Message:
  -----------
  [LV] Don't vectorize epilogue with scalable VF if no iterations remain. (#149789)

Currently we may try to vectorize the epilogue with a scalable VF, even
if there are no remaining iterations after the main vector loop with a
fixed VF.

Update selectEpilogueVectorizationFactor to always compute the number of
remaining iterations and exit early if no epilogue iterations remain.

Fixes https://github.com/llvm/llvm-project/issues/149726

PR: https://github.com/llvm/llvm-project/pull/149789



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