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List:       linux-arm-kernel
Subject:    Re: Floating point in Kernel
From:       Russ Dill <Russ.Dill () asu ! edu>
Date:       2004-07-30 5:26:05
Message-ID: 1091165165.5289.0.camel () localhost
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On Thu, 2004-07-29 at 14:22, Nicolas Pitre wrote:
> 
> Nicolas
> 
> On Thu, 29 Jul 2004, Mauricio Lin wrote:
> 
> > Hi All,
> >
> > I would like to know if there is any possibility to
> > use floating point numbers and operations in kernel
> > code compiled for arm arch?
> 
> The official answer is "no".
> 
> If you really know what you're doing then the answer is "possibly", but then 
> you wouldn't ask questions about it.  And no, I won't tell you how.
> 
> In other words, don't use floats in kernel code.  You shouldn't have to.
> Use fixed point math instead.

definately the right solution, you can do *anything* in fixed point
(Nicolas should know...his softfloat library is essentially written in
fixed point). For a good example, look up "cordic rotation"

-- 
Russ Dill <Russ.Dill@asu.edu>


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