[all-commits] [llvm/llvm-project] abfd56: [VPlan] Mark VPActiveLaneMaskPHIRecipe as readnone...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: abfd56293c20f9fdbc31518bb19c7c9aad47b202
      https://github.com/llvm/llvm-project/commit/abfd56293c20f9fdbc31518bb19c7c9aad47b202
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2026-01-30 (Fri, 30 Jan 2026)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp
    M llvm/test/Transforms/LoopVectorize/AArch64/conditional-branches-cost.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/predicated-costs.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/store-costs-sve.ll

  Log Message:
  -----------
  [VPlan] Mark VPActiveLaneMaskPHIRecipe as readnone. (#177886)

VPWidenActiveLaneMaskPHIRecipe does not have side-effects and also does
not access memory. Mark accordingly. This allows hoisting of some
invariant loads out of loops and also removing unused phi recipes in the
future.

In
llvm/test/Transforms/LoopVectorize/AArch64/conditional-branches-cost.ll,
the hoisting makes vectorization profitable.

PR: https://github.com/llvm/llvm-project/pull/177886



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