[prev in list] [next in list] [prev in thread] [next in thread] 

List:       xvid-devel
Subject:    Re: [XviD-devel] scene change detecting in Bframes mode
From:       "Marco Al" <m.f.al () student ! utwente ! nl>
Date:       2002-08-19 18:35:29
Message-ID: 002b01c247af$3228d1a0$bca45982 () student ! utwente ! nl
[Download RAW message or body]

Marc FD wrote:

> i've finished to code a MMX SSD. it's faster, but i don't know how
> much, because i used avisynth as test env. i can send it to you when
> you want

For me a mmx version (just an inline assembly hack) with prefetch
manages about 1 ms for a 640*480 buffer (luminance only) on a 800 Mhz
Duron with 100 MHz DDR memory. About 3 times faster than C, most of the
gain coming from prefetch. Im a lousy coder though :) so a good version
might speed that up by a factor 2 or so and make it complete memory
bandwith limited ... even so, its pretty evident that this function has
negligible running time.

Marco




[prev in list] [next in list] [prev in thread] [next in thread]