Computer Science and Engineering
Department
Computer Architecture II (ACOE301)
Laboratory Exercise #5
Loops
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Grade
Computer Architecture II Lab5- ACOE301
Exercise #5: Loops
Hint: You can use the lecture notes found in
http://staff.fit.ac.cy/com.tk/ACOE301/Lecture1.ppt
Objectives:
The objectives of this experiment is to show students the use of loops in MIPS assembly.
a) Open notepad and enter the following code:
.data
n: .word 10
Fn: .word ?
.text
main:
#enter your code here
addi $v0, $0, 10 #exit program
syscall
b) In the .text segment write code that calculates the nth number in the
Fibonacci sequence
where
(0, 1, 1,
2, 3, 5, 8, 13, 21, 34, 55, ...). n should be read from memory location n, and
the resulting number should be stored to memory location Fn.
c) Save the file as "lab5.s" or "lab5.asm" including the quotes. Make sure the file
is saved as "all files".
d) Run SPIM.
e) From the SPIM menu select "File => Load File". Select the file you created.
f) Run the program and verify its operation. If necessary, single step through the
program or use breakpoints to debug it.
Questions
1. How many instructions did your program contain?
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Computer Architecture II Lab5- ACOE301
2. How many registers did your program require?
3. Which is the Fibonacci number F20?
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