[llvm] [LoopVectorize] Improve Vectorization of Low Trip Count Loops (PR #195823)

[Jack Styles via llvm-commits]

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@@ -5790,14 +5814,78 @@ LoopVectorizationPlanner::computeBestVF() {
     return {VectorizationFactor::Disabled(), nullptr};
   // If there is a single VPlan with a single VF, return it directly.
   VPlan &FirstPlan = *VPlans[0];
+  auto IsUnprofitableOneScalarTail =
+      [&](const VectorizationFactor &CurrentFactor, bool HasTail,
+          bool ForceVectorization, const ElementCount &ExactTC,
+          const VectorizationFactor &ScalarFactor,
+          const InstructionCost &ScalarCost, unsigned int UserIC) {
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Stylie777 wrote:

Done

https://github.com/llvm/llvm-project/pull/195823