[all-commits] [llvm/llvm-project] 0aac22: [LV] Correctly cost chains of replicating calls in...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0aac22758a81a98d9612ed1ad4853d9e434e8451
      https://github.com/llvm/llvm-project/commit/0aac22758a81a98d9612ed1ad4853d9e434e8451
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-08-31 (Sun, 31 Aug 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    A llvm/test/Transforms/LoopVectorize/X86/cost-conditional-branches.ll
    M llvm/test/Transforms/LoopVectorize/X86/cost-model.ll

  Log Message:
  -----------
  [LV] Correctly cost chains of replicating calls in legacy CM.

Check for scalarized calls in needsExtract to fix a divergence between
legacy and VPlan-based cost model.

The legacy cost model was missing a check for scalarized calls in
needsExtract, which meant if incorrectly assumed the result of a
scalarized call needs extracting.

Exposed by https://github.com/llvm/llvm-project/pull/154617.

Fixes https://github.com/llvm/llvm-project/issues/156091.



To unsubscribe from these emails, change your notification settings at https://github.com/llvm/llvm-project/settings/notifications