From: Paul Suade <paul.suade_at_laposte.net>
Date: Tue, 24 Sep 2002 15:44:27 +0200

Overflow bug fixed.

Added fflog10 based on fflog2.

It uses now a fixed point 4.12 bits integer instead of a fixed point 16.16
bits integer.

Example of results :

fflog10(32767) = 4.50146
fflog10(20479) = 4.28882
fflog10(17408) = 4.24048
fflog10(1279) = 3.08472
fflog10(264) = 2.4082
fflog10(72) = 1.85718
fflog10(18) = 1.25513
fflog10(15) = 1.17603
Press ENTER to continue...

----- Original Message -----
From: "Philipp Pertermann" <philipp.pertermann_at_web.de>
To: <rockbox_at_cool.haxx.se>
Sent: Tuesday, September 24, 2002 2:13 PM
Subject: Re: Re: berzerk peak meter? Alpha testers wanted.


>
> > i'm planning to generate SH1 assembly for fflog2 and fflog10 to examine
its
> > efficiency and if something can be better done.
> > > Paul: Thank you very much. I'll try this.
>
> One thing to improve is the value range. I have to calculate fflog2 of
quite large values (0 < x < 0x8000). I noticed that your implementation
works superb for small values but suffers of some overflows for big values.
Haven't traced where, yet.
>
> Phil
>
>
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Received on 2002-09-24