[llvm] [VPlan] Dispatch to multiple exit blocks via middle blocks. (PR #112138)

[Florian Hahn via llvm-commits]

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@@ -878,15 +878,9 @@ VPlanPtr VPlan::createInitialVPlan(Type *InductionTy,
   auto Plan = std::make_unique<VPlan>(Entry, VecPreheader, ScalarHeader);
 
   // Create SCEV and VPValue for the trip count.
-
-  // Currently only loops with countable exits are vectorized, but calling
-  // getSymbolicMaxBackedgeTakenCount allows enablement work for loops with
-  // uncountable exits whilst also ensuring the symbolic maximum and known
-  // back-edge taken count remain identical for loops with countable exits.
+  // We use the symbolic max backedge-taken-count, which is used when
+  // vectorizing loops with uncountable early exits
   const SCEV *BackedgeTakenCountSCEV = PSE.getSymbolicMaxBackedgeTakenCount();
-  assert((!isa<SCEVCouldNotCompute>(BackedgeTakenCountSCEV) &&
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fhahn wrote:

Yep, added back, thanks

https://github.com/llvm/llvm-project/pull/112138