[llvm] [VPlan] Replace EVL branch condition with (branch-on-count AVLNext, 0) (PR #152167)

[Florian Hahn via llvm-commits]

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@@ -2395,19 +2395,43 @@ void VPlanTransforms::canonicalizeEVLLoops(VPlan &Plan) {
   // Find EVL loop entries by locating VPEVLBasedIVPHIRecipe.
   // There should be only one EVL PHI in the entire plan.
   VPEVLBasedIVPHIRecipe *EVLPhi = nullptr;
+  VPValue *AVLNext = nullptr;
 
   for (VPBasicBlock *VPBB : VPBlockUtils::blocksOnly<VPBasicBlock>(
            vp_depth_first_shallow(Plan.getEntry())))
-    for (VPRecipeBase &R : VPBB->phis())
-      if (auto *PhiR = dyn_cast<VPEVLBasedIVPHIRecipe>(&R)) {
+    for (VPRecipeBase &R : VPBB->phis()) {
+      auto *PhiR = dyn_cast<VPSingleDefRecipe>(&R);
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fhahn wrote:

are there phis that aren't single defs?

https://github.com/llvm/llvm-project/pull/152167