brenchless_fun.java

   private static long minusOneIfNotLongMax(long value) {
      final long valueMinusOne = value - 1;
      final long diffFromValue = value - Long.MAX_VALUE;
      final long tmp = (diffFromValue - 1) >> 63;
      final long mask = ((diffFromValue >> 63) ^ tmp) & tmp;
      return (value & mask) | (valueMinusOne & (~mask));
   }