[all-commits] [llvm/llvm-project] 664c93: [VPlan] Implement VPExtendedReduction, VPMulAccumu...

[Elvis Wang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 664c937b4378b4ecc12ac193f4205966a3aa2aac
      https://github.com/llvm/llvm-project/commit/664c937b4378b4ecc12ac193f4205966a3aa2aac
  Author: Elvis Wang <elvis.wang at sifive.com>
  Date:   2025-05-16 (Fri, 16 May 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/lib/Transforms/Vectorize/VPlan.h
    M llvm/lib/Transforms/Vectorize/VPlanAnalysis.cpp
    M llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.h
    M llvm/lib/Transforms/Vectorize/VPlanValue.h
    M llvm/test/Transforms/LoopVectorize/ARM/mve-reduction-types.ll
    M llvm/test/Transforms/LoopVectorize/ARM/mve-reductions.ll
    M llvm/test/Transforms/LoopVectorize/reduction-inloop-pred.ll
    M llvm/test/Transforms/LoopVectorize/reduction-inloop.ll
    M llvm/test/Transforms/LoopVectorize/vplan-printing-reductions.ll

  Log Message:
  -----------
  [VPlan] Implement VPExtendedReduction, VPMulAccumulateReductionRecipe and corresponding vplan transformations. (#137746)

This patch introduce two new recipes.

* VPExtendedReductionRecipe
  - cast + reduction.

* VPMulAccumulateReductionRecipe
  - (cast) + mul + reduction.

This patch also implements the transformation that match following
patterns via vplan and converts to abstract recipes for better cost
estimation.

* VPExtendedReduction
  - reduce(cast(...))

* VPMulAccumulateReductionRecipe
  - reduce.add(mul(...))
  - reduce.add(mul(ext(...), ext(...))
  - reduce.add(ext(mul(ext(...), ext(...))))

The converted abstract recipes will be lower to the concrete recipes
(widen-cast + widen-mul + reduction) just before recipe execution.

Note that this patch still relies on legacy cost model the calculate the
cost for these patters.
Will enable vplan-based cost decision in #113903.

Split from #113903.



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