[llvm] [LV] Compute value of escaped induction based on the computed end value. (PR #110576)

[via llvm-commits]

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@@ -2747,17 +2747,24 @@ void InnerLoopVectorizer::fixupIVUsers(PHINode *OrigPhi,
       if (isa_and_nonnull<FPMathOperator>(II.getInductionBinOp()))
         B.setFastMathFlags(II.getInductionBinOp()->getFastMathFlags());
 
-      Value *CountMinusOne = B.CreateSub(
-          VectorTripCount, ConstantInt::get(VectorTripCount->getType(), 1));
-      CountMinusOne->setName("cmo");
-
       VPValue *StepVPV = Plan.getSCEVExpansion(II.getStep());
       assert(StepVPV && "step must have been expanded during VPlan execution");
       Value *Step = StepVPV->isLiveIn() ? StepVPV->getLiveInIRValue()
                                         : State.get(StepVPV, VPLane(0));
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ayalz wrote:

Above comment deserves update:
```
  // The simplest way to get this is to recompute it from the constituent SCEVs,
  // that is Start + (Step * (CRD - 1)).
```

https://github.com/llvm/llvm-project/pull/110576