[llvm] [LoopVectorize] Vectorize select-cmp reduction pattern for increasing integer induction variable (PR #67812)

[Florian Hahn via llvm-commits]

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@@ -5106,8 +5106,9 @@ LoopVectorizationCostModel::selectInterleaveCount(ElementCount VF,
         HasReductions &&
         any_of(Legal->getReductionVars(), [&](auto &Reduction) -> bool {
           const RecurrenceDescriptor &RdxDesc = Reduction.second;
-          return RecurrenceDescriptor::isAnyOfRecurrenceKind(
-              RdxDesc.getRecurrenceKind());
+          RecurKind RK = RdxDesc.getRecurrenceKind();
+          return RecurrenceDescriptor::isAnyOfRecurrenceKind(RK) ||
+                 RecurrenceDescriptor::isFindLastIVRecurrenceKind(RK);
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fhahn wrote:

needs test without forced interleave count ?

https://github.com/llvm/llvm-project/pull/67812