/* Midterm practice #2.  Implement the following function according to
 * the specification.  Follow the C-assembly interface conventions of
 * the lab's compiler and assembler.
 *
 * In:  v - a long value
 * Out: the number of bits in v that are 1
 * Computes the number of 1 bits in the given long value.  For example
 * count_ones(13) should return 3.
 */
unsigned short count_ones(long v);