Andy Shaw <andy.shaw@VIRGIN.NET> wrote:
>Hi Folks,
>Does anyone out there have any code for a reasonably
>fast divide by 10 routine. I'm just looking for a rounded
>up 8 bit signed value as the result I don't need the
>remainder.

It's not clear how large your dividend is, but if it is a
single byte, take a look at this from Andy Warren.

(Posting this for Andy W in case he is taking a nap.)

Note that this is unsigned arithmetic.


; 8-Bit Divide.  Written by Andy Warren.
;
; Copyright (C) 1994 Fast Forward Engineering.  All rights reserved.
; Permission is hereby granted for any non-commercial use,
; so long as this copyright notice remains intact.
;
; Enter with Dividend in DIVIDEND, divisor in DIVISOR.
;
; Exits with quotient in QUOTIENT and remainder in REMAINDER, DIVIDEND
; scrambled, DIVISOR unchanged, carry-flag set.
; It takes about 80 cycles.

DIVIDE  MOVLW   1
        MOVWF   QUOTIENT

        CLRF    REMAINDER

LOOP    RLF     DIVIDEND
        RLF     REMAINDER

        MOVF    DIVISOR,W
        SUBWF   REMAINDER,W
        SKPNC

        MOVWF   REMAINDER

        RLF     QUOTIENT
        BNC     LOOP



--
Bob Fehrenbach    Wauwatosa, WI     bfehrenb@execpc.com