[ChrisJ7]

Hi guys I"ve been given an assignment in MIPS assembly where i need to create a program that takes two numbers from a user and performs several arithmetic function on those values. i don't know much about asm language so been digging around on several sites and don't really seem to be able to find what i'm looking for.

my tutor suggested i create the program in java first to help me get a better understanding of how i could implement things in asm. the main problem i'm having though is performing a modulus i.e div num1 by num2 and display the remainder, raising num1 to the power of num2 and displaying prime number between num1 and num2.

I"M NOT ASKING FOR CODE! but if any one can suggest a place i might be able to find the information i need to implement these functions or maybe what algorithms i need look at to achieve this in asm i will be eternally grateful:)

Oh also, I was only given two weeks to complete this assignment and my tutor says we wont be using ASM again after this project so as much as i"d love to take a few months to learn the ins and out of asm language I really don't need too nor do i have the time:( thanks, C

This post has been edited by Curtis Rutland: 22 March 2012 - 06:21 AM
Reason for edit:: Renamed title to be more descriptive and moved to Assembly

[blackcompe]

Quote

my tutor suggested i create the program in java first to help me get a better understanding of how i could implement things in asm.

I doubt that will help. If you don't know how to implement those things in a high-level language, you shouldn't be doing them in assembler.

Once you delve into coding, here are some key things to help:

Quote

i'm having though is performing a modulus i.e div num1 by num2 and display the remainder

Use div $r1, $r2 to get the remainder into Hi and mfhi $r1 to get Hi into a register.

Quote

raising num1 to the power of num2

Do a string of multiplications using a loop. Use mult $r1, $r2, $r3 and j Label.

Quote

displaying prime number between num1 and num2

This is a combination of the previous two tasks with a bit more complexity. You loop from num1 to num2, and test each number for primeness by looping from 2 to itself doing modulo operations. Use syscall 1 to print an integer.

The first two tasks aren't so hard. You didn't mention whether the numbers your operating on had to be retrieved from the console or hard coded into your program. Consider picking up Patterson and Hennessey's book. It's cover MIPS very well and can be read quickly.

Resources
(Google Books Preview) Computer Organization and Design (Chapter 3 has tidbits)
(Amazon) Computer Organization and Design
MIPS Programmer Guide
MIPS Instruction Reference
MIPS Quick Reference

This post has been edited by blackcompe: 06 February 2012 - 02:34 PM

[ChrisJ7]

Hi blackcompe, thanks for the quick reply and advice, here is a brief outline of what I’ve got to produce.

Task One

Produce a menu such as the one below (remember to keep to this specification).
//--------------------------------------//
M E N U

1, Enter Number 1
2, Enter Number 2
3, Display num1 and num2
4, Display sum of num1 and num2
5, Display product of num1 and num2
6, Divide num 1 by num 2
7, Exchange numbers 1 and 2
8, Display Numbers between num 1 and num 2
9, Sum numbers between num1 and num2
10, Raise num 1 to the power of num2
11, Display prime numbers between num1 and num2
12, Quit

Choose an Option…..
//--------------------------------------//
As you can see I have to take input from the user and then allow them to perform the operations in the list above. I created most of it in java no problem but it’s not really helped me tbh. I’ve managed to produce the menu and get up to option 8 fairly easily except on option 6 I need to display the remainder too. I think your suggestions have helped shed some light on things. I’ll give it a go and let you know how I get on. Once again thanks for your help and the book suggestion. Enjoy the rest of your day, thanks, C

[ChrisJ7]

Oh, just to avoid confusion, I'm up to option 8 in asm not java!

[blackcompe]

See MIPS loops lecture notes. In the navigation links (on the left), go to section notes and it's the first handout.

This post has been edited by blackcompe: 06 February 2012 - 02:42 PM

[ChrisJ7]

Awesome man, thanks for the link, some really good suff in there. really appreciate it

[ChrisJ7]

Ok, just a follow up on my thread about how to do division in MIPS and output the remainder for anyone else having trouble with this.
After many hours of trying to figure this out I’ve found two methods to do this. The first (I think) is the preferred method and the second method works fine but is maybe not the right way to go about things, who cares if it works it works!

The first method suggested by blackcompe in a thread above I couldn’t get to work at first, but after a day of frustration and a lot of patience I finally figured it out!

Method One:

addi  $s1, $s1, 17  # $s1 has a value of 17
addi  $s2, $s2, 3    # $s2 has a value o 3
div  $s1, $s2, #divide s1 by s2 (17/3= 5 rem 2)
mflo $s1, # move 5 from low register to s1
mfhi $s2, # move 2 from hi register to s2
addi $v0, $zero, 1 #sys call to print s1
add $a0, $zero, $s1, 1 
syscall
addi $v0, $0, 4 #prints the string “remainder”
la $a0, rem
syscall
addi $v0, $zero, 1 #sys call to print s2
add $a0, $zero, $s2, 
syscall

Method Two:

divu $s5, $s1, $s2 #divide s1 by s2 and store the 5 in s5

addi $v0, $zero, 1 #print s5 value
add $a0, $zero, $s5
syscall

addi $v0, $0, 4 # print string “remainder”
la $a0, remainder
syscall
rem $s6, $s1, $s2 # divide s1 by s2 and store the remainder in s6 (notice the “rem used to store the remainder after the division”)

addi $v0, $zero, 1# Prints the remainder
add $a0, $zero, $s6
syscall

Pretty much equal amounts of code and both ways seem to work just as well for my needs but from what I can gather method one is the preferred method.

[sulty28194]

 HI There,

i have to carry out the same task as you did back in February.... how did you go past the last two options (for raising num1 to the power if num2) and also for finding the prime numbers in between them

Please your help would be very much appreciated as i need to hand these in on the 3rd of January. 

Tip: click inside this box to load the editor

[ChrisJ7]

Hi, sulty28194 email me @ Chrisjennings7@gmail.com and i will send you some examples, Merry Xmas

This post has been edited by ChrisJ7: 24 December 2012 - 06:08 AM