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Assembly language: dividing

Posted on 2007-04-11
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Last Modified: 2008-02-01
I am writing a program in MIPS assembly language with PCSpim. I want it to be able to Multiply. Here is what I have. Any suggestions?

.data
.globl       firstNum
.globl      secondNum

firstNum:      .asciiz"\nWhat is the First Number?\n"
secondNum:      .asciiz"\nWhat is the Second Number?\n"
space:            .asciiz"\n"

.text
.globl main

main:
addu      $s7, $0, $ra

#Queries user for the first number
li      $v0, 4
la      $a0, firstNum
syscall
li      $v0, 5                  
syscall
add      $t1,$v0,$zero

#Queries user for the second number
li      $v0, 4
la      $a0, secondNum
syscall
li      $v0, 5                  
syscall
add      $t2,$v0,$zero

mul      $t3,$t1,$t2

add      $t4,$t3,$zero
add      $t5,$t3,$zero      

mfhi      $t4
mflo      $t5

#Space
add      $t3,$t4,$t5
li      $v0, 4
la      $a0, space
syscall

add      $a0,$t3,$zero
li      $v0, 1
syscall
addu      $ra, $0, $s7
jr      $ra
add      $0, $0, $0
0
Comment
Question by:TheTechGuysNYC
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7 Comments
 
LVL 3

Author Comment

by:TheTechGuysNYC
ID: 18891338
I'm sorry, the title here should be multiplying..
0
 
LVL 15

Assisted Solution

by:mr_egyptian
mr_egyptian earned 200 total points
ID: 18895681
Check here:

http://www.cs.uic.edu/~i366/notes/MIPS%20Quick%20Tutorial.htm

under 'Arithmetic Instructions'

mult      $t3,$t4
mflo      $t1
0
 
LVL 19

Accepted Solution

by:
BrianGEFF719 earned 1800 total points
ID: 18993057
Hi,

I'm not sure what you're doing here:

mul      $t3,$t1,$t2

add      $t4,$t3,$zero
add      $t5,$t3,$zero      

mfhi      $t4
mflo      $t5

You're storing the result in $t3, you then move it to $t4 and $t5? Why are you doing this? I think what you want to do is something like:

mult      $t1,$52  ;$t2 * $t2
mfhi    $t3        ;high 32 bits in $t3
mflo    $t4        ;low 32 bits in $t4

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LVL 19

Assisted Solution

by:BrianGEFF719
BrianGEFF719 earned 1800 total points
ID: 18993066
Your code works fine, here is the output I get when I test it:


What is the first number?
5

What is the second number?
2

10
0
 
LVL 19

Expert Comment

by:BrianGEFF719
ID: 19069347
Did you have any other questions? Because the code is working fine now.
0
 
LVL 19

Expert Comment

by:BrianGEFF719
ID: 19138532
@TheTechGuysNYC, was there anything else that I can clarify for you?
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