[llvm] [LoopVectorizer] Prune VFs based on plan register pressure (PR #132190)

[Sander de Smalen via llvm-commits]

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@@ -7801,6 +7598,15 @@ VectorizationFactor LoopVectorizationPlanner::computeBestVF() {
 
       InstructionCost Cost = cost(*P, VF);
       VectorizationFactor CurrentFactor(VF, Cost, ScalarCost);
+
+      // Make sure that the VF doesn't use more than the number of available
+      // registers
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sdesmalen-arm wrote:

nit: this comment can be dropped, because the code below says as much.

https://github.com/llvm/llvm-project/pull/132190