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Re: [f-cpu] calling conventions



Oh stop ! i'm not saying that's a great deal !!! i'm just explaining with a
very simple example what it could give on another more complex examples,
especially in compound functions. That's all. We don't need to make a story for
that ! my proposal was in fact a suggestion, so please take it or not but don't
speak as if I really imposed it. I just want to understand why you discard some
possible improvement.

I worked on SH and I was very deceived because the choice of register use in
GCC. I think the reason they used the same convention as Hitachi C compiler
calling convention if for compability with the libraries of the latter, whereas
they could have chosen a more efficient way to do so if no compatibility was
not involved. besides, the last argument of Michael (how is 'open' prototyped)
should have been the first to say to explain why he wanted to avoid some
suggestions of mine. Now I know them, I can understand what his requirements
are.

Anyway, given that people are really free to use those registers as they want
since there is no real constraint or even involvement in hardware part... so I
really want to close this discussion because it is no use to get cross with
each other about that topic.


----- Original Message -----
From: Thomas Lavergne <thomas.lavergne@laposte.net>
To: <f-cpu@seul.org>
Sent: Friday, June 07, 2002 10:51 AM
Subject: Re: [f-cpu] calling conventions


>
>Not so bad, if you use STL (c++) and bind functions, you have a
>class 'add' (or
>something like) which defines an operator () to make the addition.
>So my
>example would be good for this case ;P. Those classes are used to
>have compound
>functions to pass as a template argument on other classes.
>

OK but in this case your assembly code don't look like this :

add r1, r2, r1

You have more than one line of code so it was not same than in your example
and the gain of your proposal wasvery  small.


--
Thomas Lavergne                       "Le vrai rÍveur est celui qui rÍve
                                       de l'impossible."  (Elsa Triolet)
thomas.lavergne@laposte.net
d-12@laposte.net    ICQ:#137121910     http://assoc.wanadoo.fr/thallium/


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