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Re: Floating point performance

To: Matej Kupljen <matej.kupljen@ultra.si>
Subject: Re: Floating point performance
From: Jerry <jerry@wicomtechnologies.com>
Date: Tue, 27 Sep 2005 11:42:08 +0300
Cc: linux-mips@linux-mips.org
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Reply-to: Jerry <jerry@wicomtechnologies.com>
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>[In reply to "Floating point performance" from Matej Kupljen 
><matej.kupljen@ultra.si> to linux-mips@linux-mips.org 
><linux-mips@linux-mips.org>  27.09.2005 11:17]

> Hi

> I've built soft float toolchain (with crosstool) and then build
> MPlayer with it. The performance is very low. I cannot even
> As it seems, all the time is spent in the FP routines.
> I decided to use SF toolchain, because they should be faster
> then FPU emulator (at least it is on ARM), but did no test
> this with emulator.

Decoding of mp3 (and/or other media) with FP routines is extremely
slow on systems w/o fp processor. No matter is it "soft-float" or
"kernel-trap emulator". Both cases it is the emulator.(but SF is a
litthe faster because it has no "trap" overhead).

> Does anybody use MPlayer on MIPS? 
> What performance do you get?

I used mplayed with libmad (libmad uses only integer ops to decode
mp3). It consumes about 10-15% of cpu time (au1200) to play mp3 file.



   ()_()
 -( ^,^ )- -[21398845]- -<The Bat! 3.51.10>- -<27.09.2005 11:33>-
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