IVP wrote:
> if(diff >=3D 0)
>      byte =3D 0;
> else
>
> {
>      byte =3D 8;
>      diff =3D - diff;
> }

I'm no C whiz (I can just about spell it), but that looks really messed up
to me.  Hopefully someone that actually knows C will jump in, but doesn't
the ";" at the end of the second line end the IF statement?  If so, the ELS=
E
must be part of a outer IF statement not shown?

Unfortunately C encourages such messily written code.  Yucc.

Anyway, assuming 16 bit signed integers and the general case of DIFF and
BYTE not being in special (near) memory, the first two lines can be state i=
n
ASM30 thusly:

    mov   #0, w1      ;get zero ready in case needed
    mov   diff, w0    ;get DIFF
    btss  w0, #15     ;DIFF < 0 ?
    mov   w1, byte    ;no, DIFF >=3D 0, clear BYTE to 0

Note that this code snippet trashes W0 and W1.


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