Re: Floating point on IBM PPC405 (266MHz)
From: Marius Groeger (bitbucket_at_invalid-domain-see-sig.nil)
Date: 09/19/03
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Date: 19 Sep 2003 08:43:59 GMT
On Fri, 19 Sep 2003 06:44:39 GMT,
Juergen Beisert <NOSPAMjbeisert@netscape.net> wrote:
> On 18 Sep 2003 06:56:34 -0700, s_popov@prosyst.bg (Alexander Popov)
> wrote:
>
> >Is anyone out there using linux on a board with IBM PPC405 (266MHz) CPU?
>
> Yes. PPC405GPr.
>
> >Are there any serious performance problems with the floating point
> >operations?
>
> Yes, because the PPC405 has no floating point support.
In any case, you should make sure you are using a proper toolchain that does
not generate floating point instructions (ie. implies a -fsoft-float). These
can be handled by the kernel's math emulation, but this will slow things
down even more.
Regards,
Marius.
-- Marius Groeger SYSGO Real-Time Solutions GmbH www.sysgo.de Software Engineering Embedded and Real-Time Software www.osek.de mgroeger @ sysgo de Germany www.elinos.com
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