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Re: A float point arithmetic in kernel extension

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Re: A float point arithmetic in kernel extension

Subject: Re: A float point arithmetic in kernel extension
From: Graham J Lee <email@hidden>
Date: Tue, 07 Mar 2006 12:04:32 +0000

On 7/3/06 05:53, wlq wrote:

I am building one kernel extension for my device and I need do some float point arithmetic.
The problem is,
 In my code, I have added header file
 #include <math.h>
And I have called some float point function pow(float, float), acos(float) etc.

Actually, pow() and acos() take double arguments, though there are float equivalents.

How precise and over how much of a range do you need your results? You could get away with fixed-point arithmetic or a lookup table in some circumstances (though don't wire down a 250MB lookup table; I'm speaking as a Spectrum[*] programmer :-). You don't need even 'float'-level precision for some tasks.

Cheers,

Graham.
[*]TS 1000, transatlantic brethren (and sistren)
--
Graham Lee
UNIX Systems Manager,
Oxford Physics Practical Course
http://users.ox.ac.uk/~wadh1342
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