[llvm] [VPlan] Move addExplicitVectorLength to tryToBuildVPlanWithVPRecipes (PR #166164)

[Florian Hahn via llvm-commits]

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@@ -610,9 +610,11 @@ createScalarIVSteps(VPlan &Plan, InductionDescriptor::InductionKind Kind,
                     VPBuilder &Builder) {
   VPRegionBlock *LoopRegion = Plan.getVectorLoopRegion();
   VPBasicBlock *HeaderVPBB = LoopRegion->getEntryBasicBlock();
-  VPCanonicalIVPHIRecipe *CanonicalIV = LoopRegion->getCanonicalIV();
-  VPSingleDefRecipe *BaseIV = Builder.createDerivedIV(
-      Kind, FPBinOp, StartV, CanonicalIV, Step, "offset.idx");
+  VPValue *IV = LoopRegion->getCanonicalIV();
+  if (auto *EVLIV = LoopRegion->getEVLBasedIV())
+    IV = EVLIV;
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fhahn wrote:

Hmm, so now potentially more transformations need to handle EVL based IVs?

https://github.com/llvm/llvm-project/pull/166164