-- Original Message --
Subject: RE: Doing floating point calculations in kernel space
From: Toni Van Remortel <redacted>
Reply-To: t.vanremortel@ha.be
To: Wolfgang Grandegger <redacted>
Cc: Linuxppc-Embedded <redacted>
Date: Fri, 17 Oct 2003 10:59:29 +0200


Op vr 17-10-2003, om 09:52 schreef Toni Van Remortel:

quoted

Op vr 17-10-2003, om 09:33 schreef Wolfgang Grandegger:

quoted

 ftp://ftp.denx.de/pub/RTAI/contrib/fp_ppc_8xx.tar.bz2
It links statically with the libm and the soft-float
library derived from libgcc.

Hope it's useful.

Seems useful. Let's check it out deeper and implement it into my module.
I'll keep you informed.

It compiles, it runs. Very nice. Thank you a lot for the example. I had
only to add the extra linking to my compile command.

Unfortunately, this soft-float implementation from GCC is very
very slow :-(. I'm just doing some benchmarking with soft-float
on IBM 405 and compare the result with the soft-float library
provided by VxWorks. And a simple add (__adddf3) is approx. 5
times faster on VxWorks. And a look to the assembler code makes
clear why. Has anybody else on this list made similar experience
or it there a better free implementation? Has this been improved
in GCC >= 3.2.

Thanks.

Wolfgang.

Wolfgang


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