[all-commits] [llvm/llvm-project] 07c085: [VPlan] Add narrowToSingleScalarRecipe transform. ...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 07c085af3efcd67503232f99a1652efc6e54c1a9
      https://github.com/llvm/llvm-project/commit/07c085af3efcd67503232f99a1652efc6e54c1a9
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-05-18 (Sun, 18 May 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/test/Transforms/LoopVectorize/SystemZ/pr47665.ll
    M llvm/test/Transforms/LoopVectorize/X86/cost-model.ll
    M llvm/test/Transforms/LoopVectorize/version-stride-with-integer-casts.ll

  Log Message:
  -----------
  [VPlan] Add narrowToSingleScalarRecipe transform. (#139150)

Add a new convertToUniformRecipes transform which uses VPlan-based
uniformity analysis to determine if wide recipes and replicate recipes
can be converted to uniform recipes.

There are a few places where we ad-hoc convert recipes to uniform
recipes, which this transform will eventually replace. There are a few
more generalizations required to do so which I plan to do as follow-ups.

By converting the recipes to uniform recipes, we effectively materialize
the information from the VPlan-based analysis.

Note that there is one regression at the moment in SystemZ/pr47665.ll
due to trivial constant folding opportunities in the input IR. This will
be fixed by VPlan-based constant folding
(https://github.com/llvm/llvm-project/pull/125365/)

PR: https://github.com/llvm/llvm-project/pull/139150



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