Not using w or any other register except X. Only works for
X<=0x7f unsigned.

        bsf             STATUS,CARRY
        rlf             x,f

Since 2X always gives an even result (bit 0=0), setting CY to 1
before rlf has the effect of adding 1 to the result.

Ruben

> Hi guys. Here is tiny challendge to warm up. ;)
>
> We have X variable. What is shortest possible
> code to obtain 2X + 1 result back into X cell ?
>
> WBR Dmitry.
>
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==============================
Ruben Jvnsson
AB Liros Electronic
Box 9124, 200 39 Malmv, Sweden
TEL INT +46 40142078
FAX INT +46 40947388
ruben@pp.sbbs.se
==============================

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