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. When you are done with all of the in-class programming assignments, email them to dferry_submit@slu.edu. Include your answers to each question in your email, in a text file, or in program comments and include them with your submission. These will count for credit as your participation grade.