[llvm] [VPlan] Impl VPlan-based pattern match for ExtendedRed and MulAccRed (PR #113903)

[Florian Hahn via llvm-commits]

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@@ -2579,7 +2611,7 @@ class VPInterleaveRecipe : public VPRecipeBase {
 /// A recipe to represent inloop reduction operations, performing a reduction on
 /// a vector operand into a scalar value, and adding the result to a chain.
 /// The Operands are {ChainOp, VecOp, [Condition]}.
-class VPReductionRecipe : public VPSingleDefRecipe {
+class VPReductionRecipe : public VPRecipeWithIRFlags {
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fhahn wrote:

Sorry for coming just back to this, I think it would be possible and good to split this off, because it looks like VPReductionRecipe currently uses flags from the reduction descriptor in some places ( https://github.com/llvm/llvm-project/blob/main/llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp#L2229) and from the underlying instruction (!) in some other places https://github.com/llvm/llvm-project/blob/main/llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp#L2349

https://github.com/llvm/llvm-project/pull/113903