[llvm] [VPlan] Chose between FOR and predicated IV in createHeaderPhiRecipes. (PR #201208)

[Ramkumar Ramachandra via llvm-commits]

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@@ -875,18 +876,20 @@ bool LoopVectorizationLegality::canVectorizeInstr(Instruction &I) {
       return true;
     }
 
-    if (RecurrenceDescriptor::isFixedOrderRecurrence(Phi, TheLoop, DT)) {
+    bool IsFOR = RecurrenceDescriptor::isFixedOrderRecurrence(Phi, TheLoop, DT);
+    if (IsFOR)
       FixedOrderRecurrences.insert(Phi);
-      return true;
-    }
 
     // As a last resort, coerce the PHI to a AddRec expression
     // and re-try classifying it a an induction PHI.
-    if (InductionDescriptor::isInductionPHI(Phi, TheLoop, PSE, ID, true) &&
-        !IsDisallowedStridedPointerInduction(ID)) {
+    bool IsPredIV =
+        InductionDescriptor::isInductionPHI(Phi, TheLoop, PSE, ID, true) &&
+        !IsDisallowedStridedPointerInduction(ID);
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artagnon wrote:

Could introduce InductionDescriptor::isPredicatedInduction for clarity?

https://github.com/llvm/llvm-project/pull/201208