lkml.org 
[lkml]   [2004]   [May]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: How to use floating point in a module?
Date
From
Manfred Spraul <manfred@colorfullife.com> said:
> Horst von Brand wrote:
> >Trascendental functions are _not_ computed by series in practice, rational
> >approximations (polinomial / polinomial) are used instead. Or interpolate
> >in a smallish table.

> Is that really faster on modern cpus? The multiplier is fully pipelined
> and a division takes 25-40 cycles.

You need smallish polinomials for double precision, via series it would
take you a lot more terms (and then you get trouble from rounding etc).

No, numerical computation is not my main interest. I might be wrong here.
--
Dr. Horst H. von Brand User #22616 counter.li.org
Departamento de Informatica Fono: +56 32 654431
Universidad Tecnica Federico Santa Maria +56 32 654239
Casilla 110-V, Valparaiso, Chile Fax: +56 32 797513
-
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: 2005-03-22 14:03    [W:0.032 / U:0.448 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site