Re: [f-cpu] dynamic code reuse

[devik <devik@cdi.cz>]

You should post short example. I don't understand your idea yet.

On Mon, 8 Dec 2003, Nicolas Boulay wrote:

> Le Dimanche 7 Décembre 2003 16:36, Michael Riepe a écrit :
> > On Sun, Dec 07, 2003 at 04:19:58PM +0000, Nicolas Boulay wrote:
> > > There is a branch of studies concerning the reuse of soon calculated
> > > value in code.
> > >
> > > http://citeseer.nj.nec.com/sodani97dynamic.html
> > >
> > > The idea from the paper is that there is always some result in the code
> > > that have been soon calculated. The idea is to reuse the result instead
> > > of recalulate it. Increase speed could reach 20%.
> > >
> > > This gave me an idea but with software support.
> > >
> > > This is a kind of jump instruction. The jump take some register and one
> > > adresse. If the content of the r register + the PC match a internal
> > > specific cache the result of 2w register is set and the jump occur.
> >
> > Sounds a lot like `speculative execution' to me.
> > Disclaimer: I didn't read the paper yet.
> >
>
> nop this is a specultative reuse of a previous calculated result.
>
> > > To fill the cache, some thing "watch" the result calculated  where the
> > > instruction is supposed to jump. In case of interrupt, this is lost to
> > > avoid confusion and to stay stateless.
> > >
> > > This instruction needed to be handle carrefully by the compiler. So
> > > what's up in the area ?
> >
> > Rien, I suppose.
>
> Devik ? what's your opinion about this feature to implemented in the compiler
> ?
>
> nicO
>
> *************************************************************
> To unsubscribe, send an e-mail to majordomo@seul.org with
> unsubscribe f-cpu       in the body. http://f-cpu.seul.org/
>
>

*************************************************************
To unsubscribe, send an e-mail to majordomo@seul.org with
unsubscribe f-cpu       in the body. http://f-cpu.seul.org/