Hi, Michel. On Aug 21 2008, Michel Dänzer wrote: > This may be interesting for those concerned about PPC vs. x86 > performance.
Ah, this is really interesting. > Konstantinos Margaritis wrote: > > Benh suggested that I made this more known, and in particular to > > this list, so I send this mail in hope that some people might be > > interested. In particular, I ran the following benchmarks against > > libfreevec/glibc: > > > > http://www.freevec.org/content/libfreevec_104_benchmarks_updated The results are really impressive. This might explain my impression in a private mail to Charles Plessy that my iBook G3 was quite faster under Linux than under MacOS X. Apparently, MacOS X is *made* *for* altivec machines. > > The OpenSuse guys even consider using it by default on the ppc port > > even, but that's not final of course. Really nice. > > glibc integration _might_ happen if glibc developers change their > > attitude (my mails have been mostly ignored). This would be very welcome addition to glibc. Especially for the "weaker" chips that don't have any vectorial part. > > Last, I've also been working on a libm rewrite, though this will > > take some time still. I've reimplemented most math functions at the > > algorithm level, eg. so far, most functions achieve 50%-200% speed > > increase at full IEEE754 accuracy (mathematically proven, soon to be > > published online) without using Altivec yet, This part about not using altivec is interesting, since I would like to, say, be able to watch DVDs with my iBook and not have them drop so many frames. Decoding theora videos is also quite CPU intensive... :-( > > just by choosing a different approximation method (Taylor > > approximation is pretty dumb if you ask me anyway). What are you using, BTW? CORDIC? Regards, Rogério Brito. -- Rogério Brito : [EMAIL PROTECTED],ime.usp}.br : GPG key 1024D/7C2CAEB8 http://www.ime.usp.br/~rbrito : http://meusite.mackenzie.com.br/rbrito Projects: algorithms.berlios.de : lame.sf.net : vrms.alioth.debian.org -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
