CS 2734 Computer Organization II

Before the laboratory:

• Write a MIPS assembly function to do the following:
  

      int b[] = {10, -1, 7, 4, 3, 5, 2, 1};
      int d[8];
  
      int computeArray(int a[], int **x, int n)
      {
         int c[8];
         int i;
   
         for (i = 0; i < n; i++)   {
             c[i] = a[i] - i + b[i];
             d[i] = 3*c[i]
             a[i] = c[i] + 10;
         } 
         *x = d;
         return 0;
      }
  

  Assume that the address a is in register $a0, that x is in $a1 and that n is in $a2. Here x is the address of a variable that is a pointer to int. Allocate c on the stack, b as a static initialized variable and d as a static uninitialized variable.

• Write a MIPS main program to call computeArray. The calling program should output a before and after the call to computeArray. It should also output the d array after the call by using the pointer obtained through the second parameter to computeArray. You may allocate the array passed as a as an automatic variable in the main program and read its values in. You can assume that A is of size of 10. Use your read_array and write_array functions from Laboratory 4 for the input and output in the main program.

For checkoff:

• You must demonstrate your program in action using the data files that are provided at the time of checkoff.
• Hand Mr. Qiu a copy of your source code when you start the check off procedure.

This C program produces sample output for you to check your results against.