lkml.org 
[lkml]   [2006]   [Jul]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: FP in kernelspace
Arjan van de Ven wrote:
>
> > > So 2 questions are:
> > > 1) howto FP in kernel
> > >
> > kernel_fpu_begin();
> > c = d * 3.14;
> > kernel_fpu_end();
> >
>
> unfortunately this only works for MMX not for real fpu (due to exception
> handling uglies)
>

Perhaps there should be a comment to that effect? Neither the code nor
Documentation/preemt-locking (which mentions the fpu) says anything
about this little fact.

It's also broken for x86-64, which uses sse for floating point, not the
x87 fpu.

--
error compiling committee.c: too many arguments to function

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-07-30 17:25    [W:0.067 / U:0.748 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site