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

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

*** 1572,1588 ****
       *     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);
      }
  
      /**
       * 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
--- 1572,1582 ----
       *     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) {
!         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