Re: [f-cpu] Re: Delay

[Michael Riepe <michael+fcpu@stud.uni-hannover.de>]

Moin!

Yann Guidon wrote:
> good evening,
>
> Nicolas Boulay wrote:
[...]
> > It's much better to write "A xor B xor C". Synthetiseur are really 
> > good to balance tree of signal's, if you write something else you over 
> > constraint it.
> >
> > If you use and/or/not gate, it will hardly find the away to use the 
> > xor gate if available. But from the "xor" statement it will find the 
> > better way to produice a xor without a xor cells.
Synthesizers are like C compilers. I don't trust the latter, so why 
should I trust the former? After all, C compilers are much more 
elaborated. But they still can't find optimal translations in many cases.

> > We should code at the highest level as possible, most of the time, the 
> > synthetiseurs will more clever than us. And it will adapt the better 
> > code for the technology available which is impossible to do by hand.
Well, if synthesizers were as clever as you say, we could feed the F-CPU 
manual into them and they would do the rest.

> I agree with what you say.
Thank you ;-)
SCNR.

> The real question is now : how can we evaluate the (relative) delay ?
In general: not at all.

Michael.

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