[MPlayer-dev-eng] [OT] C-code Optimiation Contest

[Arpi]

Hi,

> > > > 1. you may only modify multiply_d.[ch] (NUM should stay 512 though)
> > > > 2. you may change compiler and optims in Makefile
> > > > 3. precision must stay the same
> > > > 4. to compare, you should compile the orginal code:
> > > >     make && copy matrix matrix.org && (./matrix.org >res.org)
> > > > 5. then later you can compare results via:
> > > >    make && (./matrix >res.txt) && diff -q res.org res.txt
> > > >
> > > > Have fun!
> > > >
> > > > Btw. current results by me is 738% of original speed, arpis results are
> > > > even better, as he included my tips in his alredy optimized code =))))
> > >
> > > ok here is my (ok, our:)) contribution:
> > >
> > > to get best results (19.628 faster than original) set DIM to 516 in the
> > > .h
> >
> > hmm, only ~20x faster ...
> > i get ~1000x faster (see attached) :)))
> >
> > [...]
> now you know why we needed you @ LinuxTag, we would have won all coding 
> contests! (That means at least 4 Notebooks =))
> 
> (michael's code: Cycles: 7423830  1121.179)
> 
> Btw. what algorithm are you implementing or did you invent it yourself?

he is cheating, his code works only for that data set you pass in the
sample program (a+b and a*b afair) :)))
dunno if it was allowed at linuxtag compo...


A'rpi / Astral & ESP-team

--
Developer of MPlayer G2, the Movie Framework for all - http://www.MPlayerHQ.hu