Maximum of Three Expressions

For the next example, the main program asks the user for integers x and y and writes out the maximum of x*x, x*y, and 5*y. Look ahead to page 22 to see main.

main uses this sub-task:

Write a subroutine that returns the maximum of three expressions: x*x, x*y, and 5*y for integer arguments x and y. The integers use two's complement representation. Use stack-based linking.

With our stack-based linkage convention this is:

Subroutine maxExp

  Input:   $a0 -- x, a two's complement integer
           $a1 -- y, a two's complement integer
           
  Returns: $v0 -- the maximum of x*x, x*y, or 5*y