[all-commits] [llvm/llvm-project] 3eb90f: [VPlan] Distribute execution frequencies with Bloc...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3eb90f564e8b3c8bc93c1f139589ebad30f09b9e
      https://github.com/llvm/llvm-project/commit/3eb90f564e8b3c8bc93c1f139589ebad30f09b9e
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2026-09-28 (Mon, 28 Sep 2026)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlan.h
    M llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp
    M llvm/lib/Transforms/Vectorize/VPlanUtils.cpp
    M llvm/test/Transforms/LoopVectorize/VPlan/execution-frequencies-match-bfi.ll
    M llvm/test/Transforms/LoopVectorize/X86/predicated-instruction-cost.ll
    M llvm/test/Transforms/LoopVectorize/replicate-region-branch-weights.ll

  Log Message:
  -----------
  [VPlan] Distribute execution frequencies with BlockFrequencyInfo's code. (#226841)

Instead of hand-rolling frequency propagating, manually construct BFI
and use BFI::distributeMass.

Adds a final step where frequencies are rounded up to at least one, to
distinguish between unreachable and almost never executed blocks. This
matches BFI behavior.

Note that we need to still track whether frequencies are from edges with
unknown profile info.

PR: https://github.com/llvm/llvm-project/pull/226841



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