Bob Ammerman wrote:
> 
> The following will work because of the convenient locations of the two
> flags
> PM and ALM_PM:
> 
>     swapf    FLAGS,w
>     xorwf    FLAGS,w
>     andlw    1
>     btfss      STATUS,Z
>     goto      alm_end

Nice!

I don't think I'll use it though, because if I later changed the flag bit
order, I may not remember that I had to go change this code.  For
maintainability I'd prefer to have the comparison code refer to the symbols
PM and ALM_PM.

After seeing the responses here - some clever ideas, but I'm with Olin on
transparency.

I also note that I'm not exactly short of data memory.  I don't agree with
the 24-hour idea (in this instance - I would in others), but overall I think
the neatest solution for me is to move the PM flags into their own
registers.  Keeps the code easy to follow, while using 2 GPRs that are
otherwise unused, so why not?


David Meiklejohn
www.gooligum.com.au



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