diff --git a/flang/include/flang/Common/uint128.h b/flang/include/flang/Common/uint128.h
--- a/flang/include/flang/Common/uint128.h
+++ b/flang/include/flang/Common/uint128.h
@@ -165,7 +165,8 @@
       bits <<= 1;
       quotient <<= 1;
       if (numerator >= that) {
-        ++quotient;
+        // Optimized for ++quotient here
+        quotient |= 1;
         numerator -= that;
       }
     }