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[VPlan] Improve narrowToSingleScalarRecipes (NFC) #158427

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[VPlan] Improve narrowToSingleScalarRecipes (NFC) #158427

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9 changes: 5 additions & 4 deletions llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1307,13 +1307,13 @@ static void narrowToSingleScalarRecipes(VPlan &Plan) {
if (RepR && (RepR->isSingleScalar() || RepR->isPredicated()))
continue;

auto *RepOrWidenR = cast<VPSingleDefRecipe>(&R);
if (RepR && isa<StoreInst>(RepR->getUnderlyingInstr()) &&
// Handle replicate-stores to single-scalar address.
if (RepR && RepR->getOpcode() == Instruction::Store &&
vputils::isSingleScalar(RepR->getOperand(1))) {
auto *Clone = new VPReplicateRecipe(
RepOrWidenR->getUnderlyingInstr(), RepOrWidenR->operands(),
RepR->getUnderlyingInstr(), RepR->operands(),
true /*IsSingleScalar*/, nullptr /*Mask*/, *RepR /*Metadata*/);
Clone->insertBefore(RepOrWidenR);
Clone->insertBefore(RepR);
auto *Ext = new VPInstruction(VPInstruction::ExtractLastElement,
{Clone->getOperand(0)});
Ext->insertBefore(Clone);
Expand All @@ -1325,6 +1325,7 @@ static void narrowToSingleScalarRecipes(VPlan &Plan) {
// Skip recipes that aren't single scalars or don't have only their
// scalar results used. In the latter case, we would introduce extra
// broadcasts.
auto *RepOrWidenR = cast<VPSingleDefRecipe>(&R);
if (!vputils::isSingleScalar(RepOrWidenR) ||
!all_of(RepOrWidenR->users(), [RepOrWidenR](const VPUser *U) {
return U->usesScalars(RepOrWidenR) ||
Expand Down