Question

Can someone help me solve this MIPS question, it must be able to run on qtspim.

Write a MIPS code which involves three functions: a. main b. poly C. Pow to compute the value of the polynomial given below for any value of x, as given by the user. f(x) = 3x + 2x4 - 5x +7-6 Your program must pass arguments to functions such as poly and pow and get return values from these functions. The input to the program (which is x) is obtained from the user inside the main function. The final output must be printed in the main function.

Answer 1

.data
prompt: .asciiz "\nPlease enter value of x : "
prompt1: .asciiz "\nResult is : "
.text
main:
li $v0,4
la $a0,prompt #it will print prompt
syscall
li $v0,5
syscall #ask user input
move $s0,$v0 #load value of x
jal poly

li $v0,4
la $a0,prompt1 #it will print prompt
syscall
move $a0,$s1
li $v0,1
syscall

li $v0,10
syscall

poly: #it will return result in $s1
move $t7,$ra
li $s1,0 #load s1 with zero
move $t0,$s0 #load x
li $t2,5 #load power 5
jal pow
mul $t3,$t3,3 #get 3x^5
add $s1,$s1,$t3

li $t2,4 #load power 4
jal pow
mul $t3,$t3,2 #get 2x^4
add $s1,$s1,$t3

li $t2,3 #load power 3
jal pow
mul $t3,$t3,5 #get 5x^3
sub $s1,$s1,$t3

li $t2,2 #load power 2
jal pow
sub $s1,$s1,$t3

mul $t3,$t0,7 #get 7x
add $s1,$s1,$t3

sub $s1,$s1,6

move $ra,$t7
jr $ra

#it will get parameter x in t0 power in t2 return result in t3
pow:
li $t1,1 #load 1 to t1
li $t3,1 #load one as result
loop:
bgt $t1,$t2,exit
mul $t3,$t3,$t0
add $t1,$t1,1 #increase t1 by one
j loop
exit:
jr $ra

output:

Mars Messages Run 10 Please enter value of x : 2 Result is : 92 -- program is finished running -- Clear

Address Value (+0) Value (+ Mars Messages Run I/O Please enter value of x: 5 Result is 10004 -- program is finished running -- Clear