[llvm] [LoopVectorize] Further improve cost model for early exit loops (PR #126235)

[Florian Hahn via llvm-commits]

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@@ -10077,19 +10077,46 @@ static void checkMixedPrecision(Loop *L, OptimizationRemarkEmitter *ORE) {
   }
 }
 
-static bool areRuntimeChecksProfitable(GeneratedRTChecks &Checks,
-                                       VectorizationFactor &VF, Loop *L,
-                                       PredicatedScalarEvolution &PSE,
-                                       ScalarEpilogueLowering SEL,
-                                       std::optional<unsigned> VScale) {
+static InstructionCost calculateEarlyExitCost(LoopVectorizationCostModel &CM,
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fhahn wrote:

Could you document this?

https://github.com/llvm/llvm-project/pull/126235