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[LV] Change opcode of FindLast/FindFirst recurrence to Instruction::Select #162252

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[LV] Change opcode of FindLast/FindFirst recurrence to Instruction::Select #162252

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9 changes: 5 additions & 4 deletions llvm/lib/Analysis/IVDescriptors.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1226,10 +1226,6 @@ unsigned RecurrenceDescriptor::getOpcode(RecurKind Kind) {
case RecurKind::Mul:
return Instruction::Mul;
case RecurKind::AnyOf:
case RecurKind::FindFirstIVSMin:
case RecurKind::FindFirstIVUMin:
case RecurKind::FindLastIVSMax:
case RecurKind::FindLastIVUMax:
case RecurKind::Or:
return Instruction::Or;
case RecurKind::And:
Expand All @@ -1253,6 +1249,11 @@ unsigned RecurrenceDescriptor::getOpcode(RecurKind Kind) {
case RecurKind::FMaximumNum:
case RecurKind::FMinimumNum:
return Instruction::FCmp;
case RecurKind::FindFirstIVSMin:
case RecurKind::FindFirstIVUMin:
case RecurKind::FindLastIVSMax:
case RecurKind::FindLastIVUMax:
return Instruction::Select;
default:
llvm_unreachable("Unknown recurrence operation");
}
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7 changes: 6 additions & 1 deletion llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
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Expand Up @@ -6515,9 +6515,14 @@ void LoopVectorizationCostModel::collectInLoopReductions() {
if (RdxDesc.getRecurrenceType() != Phi->getType())
continue;

// In-loop AnyOf and FindIV reductions are not yet supported.
RecurKind Kind = RdxDesc.getRecurrenceKind();
if (RecurrenceDescriptor::isAnyOfRecurrenceKind(Kind) ||
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With this change, can we make Find* unreachable in getOpcode for now?

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It is another way #163541. We only need to land either #163541 or this patch.
Please let me know which patch you prefer.

RecurrenceDescriptor::isFindIVRecurrenceKind(Kind))
continue;

// If the target would prefer this reduction to happen "in-loop", then we
// want to record it as such.
RecurKind Kind = RdxDesc.getRecurrenceKind();
if (!PreferInLoopReductions && !useOrderedReductions(RdxDesc) &&
!TTI.preferInLoopReduction(Kind, Phi->getType()))
continue;
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