[llvm] [VPlan] Implement VPExtendedReduction, VPMulAccumulateReductionRecipe and corresponding vplan transformations. (PR #137746)

[Elvis Wang via llvm-commits]

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@@ -2483,15 +2489,11 @@ InstructionCost VPReductionRecipe::computeCost(ElementCount VF,
   unsigned Opcode = RecurrenceDescriptor::getOpcode(RdxKind);
   FastMathFlags FMFs = getFastMathFlags();
 
-  // TODO: Support any-of and in-loop reductions.
+  // TODO: Support any-of reductions.
   assert(
       (!RecurrenceDescriptor::isAnyOfRecurrenceKind(RdxKind) ||
        ForceTargetInstructionCost.getNumOccurrences() > 0) &&
       "Any-of reduction not implemented in VPlan-based cost model currently.");
-  assert(
-      (!cast<VPReductionPHIRecipe>(getOperand(0))->isInLoop() ||
-       ForceTargetInstructionCost.getNumOccurrences() > 0) &&
-      "In-loop reduction not implemented in VPlan-based cost model currently.");
 
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ElvisWang123 wrote:

Yes, need to remove this because need to calculate the pure reduction cost (no extend/mul...)  in transformations.

https://github.com/llvm/llvm-project/pull/137746