Hello Jennifer.

Slightly different variant: (i don't like to use GOTO operator ;)))

;1
        MOVFW   X
        SUBWF   Y,W
;2
        SKPC
        MOVFW   Y
        SKPC
        SUBWF   X,W
;3
        SUBWF   DIFF,W
;....

But i think code with with Zero_constant register will be shorter

;2
        SKPC
        SUBWF   ZERO_VAL,W
;3

WBR Dmitry.


>   For example...  the two numbers, X & Y, are in registers which must
> remain unchanged are to be tested to determine whether they are within
> DIFF of each other.
>
>   My first try this year is:
>
>           MOVF       X,W        ;Try it this way
>           SUBWF   Y,W
>
>           SKPNC                  ; Positive?
>           GOTO      POS      ; Yes
>
>           MOVF       Y,W       ; No, then do it the other way
>           SUBWF   X,W
>
> POS  SUBWF  DIFF,W  ; Compare against the limit
>
>           SKPNC                  ; The carry knows...
>           GOTO     LESS