src/java.base/share/classes/java/lang/Integer.java

rev 49267 : [mq]: 8199843-Optimize-Integer-Long-highestOneBit

@@ -1572,17 +1572,11 @@
      *     of the highest-order one-bit in the specified value, or zero if
      *     the specified value is itself equal to zero.
      * @since 1.5
      */
     public static int highestOneBit(int i) {
-        // HD, Figure 3-1
-        i |= (i >>  1);
-        i |= (i >>  2);
-        i |= (i >>  4);
-        i |= (i >>  8);
-        i |= (i >> 16);
-        return i - (i >>> 1);
+        return i == 0 ? 0 : MIN_VALUE >>> numberOfLeadingZeros(i);
     }
 
     /**
      * Returns an {@code int} value with at most a single one-bit, in the
      * position of the lowest-order ("rightmost") one-bit in the specified