Question

Write a MIPS Assembly program function to calculate the factorial of an input number. Analyze the program for the value 10 and compute the Execution time in a MIPS processor at 2.4GHz. The CPI is 1.

Answer 1

Please find the answer below.
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.data
printmsg: .asciiz " \nEnter a number to find factorial : "
printmsg2: .asciiz "Factorial of the number is : "
.text
.globl main
main:
doAgain :
la $a0,printmsg # Load the address of prompt
li $v0,4 # The string print service is specified
syscall # System call is made

li $v0,5 # The integer print service is specified
syscall # System call is made

#move data to s0
move $s0,$v0

#if s0 less than or equal to zero exit
blez $s0,exit
#load 1 to s1 store the factorial
li $s1,1

loop:
mul $s1,$s1,$s0
sub $s0,$s0,1
bnez $s0,loop
la $a0,printmsg2 # Load the address of prompt
li $v0,4 # The string print service is specified
syscall # System call is made

#print result
move $a0,$s1
li $v0,1 # The string print service is specified
syscall # System call is made

j doAgain

exit: