diff --git a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
--- a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
@@ -927,9 +927,9 @@
   // strlen(s + x) to strlen(s) - x, when x is known to be in the range
   // [0, strlen(s)] or the string has a single null terminator '\0' at the end.
   // We only try to simplify strlen when the pointer s points to an array
-  // of i8. Otherwise, we would need to scale the offset x before doing the
-  // subtraction. This will make the optimization more complex, and it's not
-  // very useful because calling strlen for a pointer of other types is
+  // of CharSize elements. Otherwise, we would need to scale the offset x before
+  // doing the subtraction. This will make the optimization more complex, and
+  // it's not very useful because calling strlen for a pointer of other types is
   // very uncommon.
   if (GEPOperator *GEP = dyn_cast<GEPOperator>(Src)) {
     // TODO: Handle subobjects.