[MPlayer-dev-eng] [RFD] Something...

[Daniel Egger]

Am Son, 2003-04-13 um 09.04 schrieb Gábor Lénárt:

> It's NOT that simple. For most cases maybe you're right. But not always.
> First of all, optimizing for memory usage and optimizing for speed are somewhat
> different things and cannot be done easily for these two goals at the same
> time!

Wrong. It's all about cache, the speed of the CPU vs. RAM accesses is diverging *so*
rapidly that anything showing cache trashing behaviour will be automatically slow.

This is a major paradigm change because formerly it was only the conditionals that
slowed code down which was tackled doing heavy loop unrolling but on modern CPUs
unrolled loops tend to be slower than straight forward (and predictable) small code.

For kicks (on a modern CPU like an Athlon XP, Hammer, Pentium IV) try compiling mplayer
with loop unrolling off and -Os instead of -O > 1.

-- 
Servus,
       Daniel
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