diff --git a/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp b/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp
--- a/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp
+++ b/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp
@@ -1081,8 +1081,7 @@
     // a truncate within in.
     bool Extended = false;
     const SCEV *IV = SE->getSCEV(CmpIndVar);
-    const SCEV *TruncatedIV = SE->getTruncateExpr(SE->getSCEV(CmpIndVar),
-                                                  ExitCnt->getType());
+    const SCEV *TruncatedIV = SE->getTruncateExpr(IV, ExitCnt->getType());
     const SCEV *ZExtTrunc =
       SE->getZeroExtendExpr(TruncatedIV, CmpIndVar->getType());