[all-commits] [llvm/llvm-project] e72422: [VPlan] Return cost of 0 for VPWidenCastRecipe wit...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e724226da753f10fd36fbb0ea392f04ab0fdbdab
      https://github.com/llvm/llvm-project/commit/e724226da753f10fd36fbb0ea392f04ab0fdbdab
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2024-10-25 (Fri, 25 Oct 2024)

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

  Log Message:
  -----------
  [VPlan] Return cost of 0 for VPWidenCastRecipe without underlying value.

In some cases, VPWidenCastRecipes are created but not considered in the
legacy cost model, including truncates/extends when evaluating a reduction
in a smaller type. Return 0 for such casts for now, to avoid divergences
between VPlan and legacy cost models.

Fixes https://github.com/llvm/llvm-project/issues/113526.



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