CS 2734 Computer Organization II

Laboratory 4 [2/10; 2/12] Loops and Logic

This laboratory explores the use of simple loops and if-else in Sparc assembly language programs. You will also be required to setup a personal homepage and link it to the CS Student Directory.

You will meet in 3.02.04SB for both laboratory 4a (2/10/97) and laboratory 4b (2/12/97). During both sessions, 10 workstations will be reserved for checkoff only. Do not log into these workstations unless you are ready to be checked off or everyone who is ready to be checked off has been checked off. You must log off of these workstations after being checked off so that others can have a chance. Prior to the laboratory, you should do the following:

Set up a personal homepage and register it. Go to http://www.cs.utsa.edu/students/directions.shtml and follow the directions for setting up your web page.
Make a separate directory for laboratory 4 and put all of the code that you develop for this lab in that directory.

Write the Sparc assembly language function calsigndot:

       int calsigndot(int a[], int n, int x)
       {
           int i;
           int sum;
  
           sum = 0;
           for (i = 0; i < n; i++) {
               if (a[i] > x)
                   sum = sum + a[i]*a[i];
               else
                   sum = sum - a[i]*a[i];
           }
           return sum;
       }

Write a C main program to call calcsigndot. This program should take three command line arguments:
- The name of the input file for the values for the array a.
- The number of elements in the array a.
- The value of x.
Check for the appropriate number of command line arguments and print out a usage message if incorrect.
Allocate space for the array a using malloc. Be sure to trap on error and exit if malloc fails.
Write a Makefile that will compile these source files, first into separate object files and then into an executable mycaldot. Use the -g compilation option.

For Checkoff:

Show that your web page is accessible from the CS Student Directory.
Let me scan your ID.
You will be asked to download data.file and run your program with the particular command line arguments:
```
       calsigndot data.file 5 21
```
(You may be asked to run with a couple of different values for the last two command line arguments.
Hand in prtext copies of your source files.

Revision Date: 2/7/97