[MPlayer-dev-eng] Re: Vorbis decoding performance
Michael Niedermayer
michaelni at gmx.at
Tue Aug 8 10:07:12 CEST 2006
Hi
On Tue, Aug 08, 2006 at 12:28:38AM +0200, Balatoni Denes wrote:
> Hi!
>
> hétf?? 07 augusztus 2006 23.09-kor Michael Niedermayer ezeket a bolcs
> gondolatokat fogalmazta meg:
> > hmm floating point emulation is slow sure but it shouldnt be that slow ...
> >
> > [...]
>
> Actually, tremor being at least 20 times faster than floating point whatever
> is what I would have expected on arm.
>
> (wma - floating point - on a 206 mhz arm cpu needed 300% cpu time, compared to
> tremor or libmad's 10-20%, when I tested these a few years ago on a strongarm
> 1100 206 mhz cpu).
maybe you want to look at libavutil/softfloat.h
its some simple software floating point thingy, benchmark code is in
libavutil/softfloat.c, if its fast on arm then maybe changing the speed
relevant float code in lavc to a macro based system which can either use
real floats or soft floats would be interresting, allthough iam not sure
yet if it would be clean/readable enough for actually being accepted in svn
[...]
--
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
In the past you could go to a library and read, borrow or copy any book
Today you'd get arrested for mere telling someone where the library is
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