[Freepooma-devel] Re: gcc-4.1 & '__attribute__((flatten))'

[Richard Guenther]

On Fri, 24 Mar 2006, Roman Krylov wrote:

> Hi all!
> Today I tried vanilla gcc-4.1 and marked some methods as 
> __attribute__((flatten)).
> Performance raised by factor of 2.2 up to ~ 5 depending on task. Great!
>
> Richard, is it possible to use '|#pragma inline complete|' instead of 
> '__attribute__((flatten))'? How do you predict performance growth ratio with 
> your other patches (forwprop & array_alias) ?

#pragma inline complete is not supported by GCC and I doubt it will be.
The other patches are already in GCC 4.2 development, they are slightly
improving performance.  Forwprop is required for array_alias, though the
latter may be slightly buggy.  So I do not recomment to apply these
patches to 4.1, but if you want to be brave, try the current 4.2 
development snapshots.

Richard.

--
Richard Guenther <richard dot guenther at uni-tuebingen dot de>
WWW: http://www.tat.physik.uni-tuebingen.de/~rguenth/