Re: A86: Sorry Dux. =-|
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Re: A86: Sorry Dux. =-|
>
>Joshua J Seagoe wrote:
>
>> oh, picky, picky. sure it works, you just have to put the number in
>b
>> backwards...
wait, could you do it backwards? would this work? this would make the
main loop smaller.
;hl=de*b
xor a ;clear stuff
ld h,a
ld l,a
cp b
ret z ;return with hl=0 if b=0
preshift: ;first shift until we get the high bit
sla b ;we're gonna do it backwards!
jr nc,preshift
add hl,de ;found the high bit
mainloop:
sla b ;remember, backwards!
jr nc, skipadd ;from the african swallow
add hl,de
skipadd:
add hl,hl
ret z ;this could be wrong...
jr mainloop
-josh
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