Re: [avr-gcc-list] Pointers below address 32

[Keith Gudger]

I've tried it on the original AVRs, and it worked.  It doesn't work on
some versions, however... such as the USB ones I work with (AT43USB3xx)...

Keith

On Tue, 10 May 2005, Joerg Wunsch wrote:

> As Björn Haase wrote:
> 
> > I never tried it, but is it actually really possible to access
> > registers by using pointer expressions?
> 
> At least, it's documented that way.
> 
> It's probably one of the lesser tested features, so the only problem
> could be silicon bugs that have never been observed before because
> nobody ever tried it. ;-)
> 
> > If that's possible, one could possibly shorten the function
> > prologues and epilogues considerably when optimizing for size.
> 
> That sounds like a good idea, but you also need to compare it against
> the -mcall-prologues option (which also trades speed for code size).
> 
> -- 
> cheers, J"org               .-.-.   --... ...--   -.. .  DL8DTL
> 
> http://www.sax.de/~joerg/                        NIC: JW11-RIPE
> Never trust an operating system you don't have sources for. ;-)
> 
> 
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