[llvm] [LV][EVL] Skip tryAddExplicitVectorLength for plans with scalar VF. (PR #125497)

[Mel Chen via llvm-commits]

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@@ -8925,7 +8925,7 @@ void LoopVectorizationPlanner::buildVPlansWithVPRecipes(ElementCount MinVF,
       VPlanTransforms::optimize(*Plan);
       // TODO: try to put it close to addActiveLaneMask().
       // Discard the plan if it is not EVL-compatible
-      if (CM.foldTailWithEVL() &&
+      if (CM.foldTailWithEVL() && !Plan->hasScalarVF() &&
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Mel-Chen wrote:

Make sense, thanks.
1524dafb3c39ac499e5800958365309ea3b9d783

https://github.com/llvm/llvm-project/pull/125497