Re: [avr-libc-dev] Re: AW: Register allocator / -fnew-ra issue

[René Liebscher]

E. Weddington schrieb:
> Björn Haase wrote:

...

>>
> > <good stuff snipped>
> >
> > 4.)
> > Adapt the library functions that are written in assembler such that 
> > they are
> > compliant
> > with the modified ABI.
> >
> > In my opinion, this way, we could possibly help the RA to make much 
> > better
> > use of the register
> > file.
> >  
>
> *If* it can be shown with good test results, that this would work, then 
> I would be willing to help out with changes to avr-libc. The other 
> developers would have to offer their opinions as well. If is is good 
> enough, then perhaps some of avr-libc could be translated back into C 
> from assembly. IMO, the big issue with changing avr-libc would be the 
> math / floating point library. We could really use someone who has 
> expertise in this area.

There is a file ctoasm.inc in the sources of the math library. I think 
most changes have to be done there. (It defines some names like rP0, rP1 
and so one for real registers like r25, r24 .)

Rene