Programming Forums - loop problem!

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The loop wont work? This is my first program in assembly and I'm getting frustrated as all hell. It reads the data correctly, but it just wont loop. scanf returns into %o0 the amount of pieces of data it read correctly, which when I'm testing i'm always using 2, so I can't see why it wont loop and ask for 2 more integers. As far as the math portion i'll get that done later.

help..please.

/****************************************************

Author: Zack Hitz

Class: CIS 235

File: Exercise2

Date: September 28, 2006

Purpose: Read two integers, compute x*x + y*y, then

         output x, y, and the answer.

****************************************************/



        .data



!String constants

        .align 4

prompt:         .asciz "Enter two integers: "

        .align 4

formati:        .asciz "%d %d"

        .align 4

formato:        .asciz "x = %d\ny = %d\nh = %d\n"



        !int x = 0;

        !int y = 0;

        !int sum = 0;

    .align 4

x:      .word 0

y:      .word 0

h:      .word 0



!void main()

!{

! printf(prompt);

! scanf(formati, &x, &y);

! sum = (x*x)+(y*y);

! printf(formato, x, y, sum);

! call exit(0);

!}



        .text

        .align 4

        .global main

main:

        save %sp, -64, %sp



        loop:

        !printf(prompt)

        sethi %hi(prompt), %o1

        call printf, 0

        or %o1, %lo(prompt), %o0



        !scanf(formati, %x, %y)

        set formati, %o0

        set x, %o1

        set y, %o2

        call scanf, 0

        nop



        ld[%o1],%o1

        ld[%o2],%o2



        sethi %hi(formato), %l1

        call printf,0

        or %l1, %lo(formato), %o0



        cmp %o0, 2

        be loop

        nop



        call exit, 0

        mov 0, %o0

Quote:

Originally Posted by sackarias (Post 115108)

be loop

Not being fluent in x86 ASM, does the 'be' instruction exist? That looks like where you are attempting to branch back to 'loop', but I cannot (quickly) find a reference to that instruction.

It does and I got it to work now. Thanks a lot.

What was the problem with your code, if you don't mind me asking? Maybe it could help others out. :)

Not at all..

main:

        save %sp, -64, %sp



        loop:        

                !printf(prompt)

                sethi %hi(prompt), %o1

                call printf, 0

                or %o1, %lo(prompt), %o0



                !scanf(formati, %x, %y)

                set formati, %o0

                set x, %o1

                set y, %o2

                call scanf, 0

                nop

                                



                !basically, branch not equals, so you want to be done

                !otherwise, it will run through the code, hitting the end

                !and going right back to 'loop' 





                !while(scanf(formati, %x, %y) == 2)

                cmp %o0,2

                bne done 

                nop



                !code was here

                

                !printf(formato, %o1, %o2, %o3)

                sethi %hi(formato), %l1 

                call printf,0

                or %l1, %lo(formato), %o0        



        ba loop

        nop

done:

        call exit, 0

        mov 0, %o0