[llvm] [LV] Increase max VF if vectorized function variants exist (PR #66639)

[David Sherwood via llvm-commits]

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@@ -943,6 +948,12 @@ bool LoopVectorizationLegality::canVectorizeInstrs() {
           }
       }
 
+      // If we found a vectorized variant of a function, note that so LV can
+      // make better decisions about maximum VF.
+      if (CI && !VFDatabase::getMappings(*CI).empty() &&
+          UseWiderVFIfVariantsPresent)
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david-arm wrote:

I think it's better to just always record if we found a variant. We're not really saving time by checking UseWiderVFIfVariantsPresent anyway.

https://github.com/llvm/llvm-project/pull/66639