1. EECE.3170 Microprocessor Systems Design I
Instructor: Dr. Michael Geiger
Fall 2016
Lecture 18
HLL  assembly (continued)

2. Microprocessors I: Lecture 18
Lecture outline
Announcements/reminders
HW 4 due 2:00 PM today
HW 5 to be posted; due 2:00 PM, Wednesday, 10/26
No Thursday office hours until my feet heal
Will stay later most M/W (on campus until 4 today)
Review: HLL  assembly
Conditional statements
Loops
Today’s lecture: HLL  assembly examples
4/4/2019
Microprocessors I: Lecture 18

3. Microprocessors I: Exam 2 Preview
Review: HLL  assembly
Conditional statements (if-then-else)
Evaluate condition (CMP instruction(s))
Conditional jump (often to “else” case)
“If” case ends with unconditional jump to skip “else”
Loops
Initialize variable at start
Test loop condition (similar to if)
Change loop variable
4/4/2019
Microprocessors I: Exam 2 Preview

4. Microprocessors I: Lecture 6
Practice problems
See today’s handout for
Description of how stack frame should be created
Description of where to access function arguments, local variables
Functions to be written
int fact(int n): Calculate and return n!
int max(int v1, int v2): Return largest value between v1 and v2
void swap(int *a, int *b): Given addresses a & b, swap contents
Solutions to be posted as PDF online
C versions in slides that follow; assembly in PDF file
Will be covered in class today as well
4/4/2019
Microprocessors I: Lecture 6

5. Microprocessors I: Lecture 6
Factorial in C
int fact(int n) { int i; int fact = 1; for (i = n; i > 1; i--) fact *= i; return fact; }
4/4/2019
Microprocessors I: Lecture 6

6. Maximum value function in C
int max(int v1, int v2) { if (v1 > v2) return v1; else return v2; }
4/4/2019
Microprocessors I: Lecture 6

7. Microprocessors I: Lecture 6
Swap in C
void swap(int *a, int *b) {
int temp;
temp = *a;
*a = *b;
*b = temp; }
4/4/2019
Microprocessors I: Lecture 6

8. Microprocessors I: Lecture 18
Final notes
Next time:
PIC intro
Reminders:
HW 4 due 2:00 PM today
HW 5 to be posted; due 2:00 PM, Wednesday, 10/26
No Thursday office hours until my feet heal
Will stay later most M/W (on campus until 4 today)
4/4/2019
Microprocessors I: Lecture 18