I hate C too, so here is my code:

; Xvar=Xvar*2+1
movf      Xvar,w        ;put X in W
addwf    Xvar,f          ; add W to X (X*2)
incf        Xvar,f          ; add 1 (x*2+1)

Note that the result is modulo 256 so it's working only if  X<127. Thus you
can check the C flag for overfolw and use it also for X>127

Mircea Chiriciuc
EMCO INVEST

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