[llvm] [LV] Vectorize conditional scalar assignments (PR #158088)

[Graham Hunter via llvm-commits]

================
@@ -4612,6 +4616,12 @@ LoopVectorizationPlanner::selectInterleaveCount(VPlan &Plan, ElementCount VF,
       any_of(Plan.getVectorLoopRegion()->getEntryBasicBlock()->phis(),
              IsaPred<VPReductionPHIRecipe>);
 
+  // FIXME: implement interleaving for FindLast transform correctly.
+  for (auto &[_, RdxDesc] : Legal->getReductionVars())
+    if (RecurrenceDescriptor::isFindLastRecurrenceKind(
+            RdxDesc.getRecurrenceKind()))
----------------
huntergr-arm wrote:

done, though I think it's not quite as neat. There's another PR that will help clean it up though (#169675).

https://github.com/llvm/llvm-project/pull/158088