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Re: [avr-libc-dev] Change EEPROM SFR definition.

From: Björn Haase
Subject: Re: [avr-libc-dev] Change EEPROM SFR definition.
Date: Thu, 30 Jun 2005 23:39:25 +0200
User-agent: KMail/1.7.1

Bernard Fouché wrote on Donnerstag, 30. Juni 2005 21:13 :
> E. Weddington wrote:
> > Björn Haase wrote:
> >> Another alternative is to provide smarter macros or inline functions
> >> for eeprom support that contain inline assembly for calling different
> >> versions of the eeprom routines.
> >
> > That's a reasonable idea. Would anyone have any objection to having
> > the EEPROM routines be inline assembly macros instead of library calls?
> >
> > I'm even willing to write up such a module, though it would have to be
> > after my vacation (which starts in an hour ;-)).
> >
> > Eric
> Will this increase program size, for instance if a program writes the
> EEPROM in ten different places? If so one can make a function that calls
> the macro once but again documentation should be very clear about such a
> change.
>     Bernard

It will *reduce* code size considerably since gcc no longer needs to save all 
the call-clobbered registers around the function call. So this is cheaper 
than usual function calls. I could ask my company next week if I could 
contribute this portion of our application code so that there would be no 
need to re-write it.



P.S.: Eric and Joerg: Have fun and relax well :-)!

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