>Scott Dattalo and Andy Warren have seen this but I thought it may
>be not only of interest of the list but maybe someone has a better
>way.  (Andy - note added parentheses)
>
>
>
>   ;Subtract two byte literal.
>   ;At exit, C = 0 if result is negative
>
>sub_word_literal: macro aaa, lll
>
>   movlw   low (~(lll) + 1)
>   addwf   aaa+1, f
>   movlw   high ((~(lll) + 1) & h'ffff')
>   skpnc
>   addlw   1
>   skpnc
>   skpz
>   addwf   aaa, f
>   endm
>
>--
>Bob Fehrenbach    Wauwatosa, WI     bfehrenb@execpc.com

Hi Bob,

I haven't got a better version, but a typo has crept into the above code
the high and low bytes of the address are flipped. ie aaa should be aaa+1
and vice versa.

This macro raise two points
        1. make the assembler/compiler do some of the work
        2. make the piclist do the debugging. :-)






Ray Gardiner, Shepparton, Victoria, Australia, ray@netspace.net.au