[all-commits] [llvm/llvm-project] f4c7cc: [LV] Use more precise isPredicatedInst in legacy C...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f4c7cc26b65912c9951f0cb09b3a5ba082096687
      https://github.com/llvm/llvm-project/commit/f4c7cc26b65912c9951f0cb09b3a5ba082096687
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-07-13 (Sun, 13 Jul 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    A llvm/test/Transforms/LoopVectorize/AArch64/predicated-costs.ll

  Log Message:
  -----------
  [LV] Use more precise isPredicatedInst in legacy CCH (NFC).

Legal::isMaskRequired may be overly conservative and also return true
when no mask is actually required.

Use isPredicatedInst from the cost model instead, which fixes a
cost-model divergence between legacy and VPlan cost model where the
legacy cost model incorrectly assumed some loads were predicated.

Fixes https://github.com/llvm/llvm-project/issues/148431.



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