Elvis Wang 664c937b43 [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.

2025-05-16 10:25:38 +08:00

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