CS 2734 Computer Organization II

This laboratory is designed to help you review MIPS assembly language and to introduce you to the floating point operations.

Prior to the laboratory, you should do the following:

• Make a new directory for this laboratory.

• Write the MIPS assembly language function dotproduct:

  float vectornorm(float a[], float b[], int n)
  {
     int i;
     float sum;
   
     sum = 0.0;
     for (i = 0; i < n; i++)
         sum = sum + a[i]*b[i];
     return sum;
  }
  

• Write a MIPS main program to call dotproduct.
  • This program should prompt for and read the value of n, the number of elements of the two arrays, array1 and array2.
  • Allocate space for the array array1 and array2 using the sbrk system call (9)
  • Modify your read_array function from laboratory 4 to read in an array of floats.
  • Use read_array to read in array1 and array2.
  • Call the dotproduct function with array1 and array2 passed as a and b respectively.
  • Output the returned value of sum after the call.

For checkoff:

• You will be given a card with the input values.
• You will be asked to single-step through your function and display the contents of the floating point registers.
• Hand in prtext copies of your source file.