[llvm] [VPlan] Unify inner and outer loop paths (NFCI). (PR #192868)

[Florian Hahn via llvm-commits]

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@@ -6999,9 +7003,21 @@ void LoopVectorizationPlanner::buildVPlansWithVPRecipes(ElementCount MinVF,
   }
 }
 
-VPlanPtr
-LoopVectorizationPlanner::tryToBuildVPlanWithVPRecipes(VPlanPtr Plan,
-                                                       VFRange &Range) {
+VPlanPtr LoopVectorizationPlanner::tryToBuildVPlan(VPlanPtr Plan,
+                                                   VFRange &Range) {
+
+  // For outer loops, the plan only needs basic recipe conversion and induction
+  // live-out optimization; the full inner-loop recipe building below does not
+  // apply (no widening decisions, interleave groups, reductions, etc.).
+  if (!OrigLoop->isInnermost()) {
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fhahn wrote:

Done by adding `hasOuterLoop()` checking if the top-level loop region contains another loop region

https://github.com/llvm/llvm-project/pull/192868