CSCI 2400: Assembly Class 6

Data Processing

Time to put it all together! In today's class you will:

1. Process an array of data looking for specific values
2. Find the max of the array
3. Find the min of the array
4. Find the position of a special target value

Exercises

1. Login to hopper.slu.edu- remember you can login with:

   ssh username@hopper.slu.edu

2. Now, download a new program for today's class:

   wget http://cs.slu.edu/~dferry/courses/csci2400/asm/array.s

3. Scroll to the bottom of today's program. You will see 500 data values labeled array. Your goal is to write a program that processes this array doing three things:
   1. Find the maximum value
   2. Find the minimum value
   3. Find the position of a specific value, 615049950 (this value is stored in the variable target)

   It should then print these values at the end of the program.

   Hints:

   • You can move the starting address of the array into a register with the instruction: leal array, %edx
   • Suppose you have the array base stored in EDX and a counter stored in ECX. Then you can use scaled indexed accessing to iterate through the array: (%edx, %ecx, 4)
   • Feel free to declare new variables to hold things such as the max and the min values
   • Start by tackling each of the three tasks separately, then integrate them together
   • You may find it useful to encapsulate some program functionality inside separate procedures, though you don't have to

4. Email your program to the instructor when you are done. Include your answers to each question in your email or in a text file and include them with your submission. These will count for credit as a homework assignment.