[llvm] [VPlan] Support early-exit loops in optimizeForVFAndUF. (PR #131539)

[Florian Hahn via llvm-commits]

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@@ -1005,6 +1005,33 @@ void VPlanTransforms::simplifyRecipes(VPlan &Plan, Type &CanonicalIVTy) {
   }
 }
 
+/// Return true if \p Cond is known to be true for given \p BestVF and \p
+/// BestUF.
+static bool isConditionKnown(VPValue *Cond, VPlan &Plan, ElementCount BestVF,
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fhahn wrote:

I updated it to `isConditionTrueViaVFAndUF`. I've not included `Branch` for now, as I think the logic is independent of whether the condition is used in a branch or otherwise.

https://github.com/llvm/llvm-project/pull/131539