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[LV] Add scalar load/stores to VPReplicateRecipe::computeCost #153218

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Merged
david-arm merged 1 commit into from
Sep 5, 2025
Merged

[LV] Add scalar load/stores to VPReplicateRecipe::computeCost #153218

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18 changes: 18 additions & 0 deletions llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3158,6 +3158,24 @@ InstructionCost VPReplicateRecipe::computeCost(ElementCount VF,
return *getCostForRecipeWithOpcode(getOpcode(), ElementCount::getFixed(1),
Ctx) *
(isSingleScalar() ? 1 : VF.getFixedValue());
case Instruction::Load:
case Instruction::Store: {
if (isSingleScalar()) {
bool IsLoad = UI->getOpcode() == Instruction::Load;
Type *ValTy = Ctx.Types.inferScalarType(IsLoad ? this : getOperand(0));
Type *ScalarPtrTy = Ctx.Types.inferScalarType(getOperand(IsLoad ? 0 : 1));
const Align Alignment = getLoadStoreAlignment(UI);
unsigned AS = getLoadStoreAddressSpace(UI);
TTI::OperandValueInfo OpInfo = TTI::getOperandInfo(UI->getOperand(0));
InstructionCost ScalarMemOpCost = Ctx.TTI.getMemoryOpCost(
UI->getOpcode(), ValTy, Alignment, AS, Ctx.CostKind, OpInfo, UI);
return ScalarMemOpCost + Ctx.TTI.getAddressComputationCost(
ScalarPtrTy, nullptr, nullptr, Ctx.CostKind);
}
// TODO: See getMemInstScalarizationCost for how to handle replicating and
// predicated cases.
break;
}
}

return Ctx.getLegacyCost(UI, VF);
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