[llvm] [VPlan] Make canonical IV part of the region (PR #156262)

[via llvm-commits]

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@@ -3300,14 +3305,15 @@ void VPlanTransforms::addExplicitVectorLength(
   VPRegionBlock *LoopRegion = Plan.getVectorLoopRegion();
   VPBasicBlock *Header = LoopRegion->getEntryBasicBlock();
 
-  auto *CanonicalIVPHI = LoopRegion->getCanonicalIV();
-  auto *CanIVTy = LoopRegion->getCanonicalIVType();
-  VPValue *StartV = CanonicalIVPHI->getStartValue();
+  auto *CanonicalIV = LoopRegion->getCanonicalIV();
+  auto *CanIVTy = CanonicalIV->getType();
+  VPValue *StartV = Plan.getConstantInt(CanIVTy, 0);
+  auto *CanonicalIVIncrement = LoopRegion->getOrCreateCanonicalIVIncrement();
 
   // Create the CurrentIteration recipe in the vector loop.
   auto *CurrentIteration =
       new VPCurrentIterationPHIRecipe(StartV, DebugLoc::getUnknown());
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ayalz wrote:

Independent: CanIV can also offer DL

https://github.com/llvm/llvm-project/pull/156262