[MPlayer-users] intel cc bench

[Arpi]

Hi,

You were right, now icc is downloadable and freely usable (unlimite dtime)
for non-commercial projects.

gcc:  gcc version 2.95.3 20010315 (release)
icc:  Intel(R) C++ Compiler for 32-bit applications, Version 5.0.1   Build 010730D0

system: celeron-2 800 @ 1066, 256mb pc133 sdram. intel bx 440 chipset.

i've only recompiled a few .c files in libavcodec dir, and compared to
fully-gcc code:  (i386/* and imgresample.c are still gcc compiled)

results:

File:  /3d/divx/Coyote.Ugly.Sample-highbitrate-atmos.avi
VIDEO:  [DIV3]  640x480  24bpp  25.00 fps  1867.1 kbps (227.9 kbyte/s)
FFmpeg-gcc : 12.224s 12.195s
FFmpeg-icc : 11.678s 11.651s

File:  /3d/divx/sample.light.it.up.avi
VIDEO:  [DIV3]  640x352  24bpp  23.98 fps  823.5 kbps (100.5 kbyte/s)
FFmpeg-gcc : 8.814s 8.755s
FFmpeg-icc : 8.420s 8.390s

File:  /3b/Star_Wars_Episode_1.avi
VIDEO:  [DIV3]  720x576  24bpp  25.00 fps  1858.5 kbps (226.9 kbyte/s)
FFmpeg-gcc : 44.583s 44.702s
FFmpeg-icc : 42.876s 42.889s

So, icc gained another 5% speedup for us. Just optimizing C code of codec.
I like icc, but it has a big problem: it crashes on several files, even in
mplayer source, and has problems with gcc inline asm. so it's impossible (at
least really hard) to make icc-only mplayer binary.
But people who need that 5% (or more) speedup still can try it.

Another thing to check:
they released several libraries containing highly-optimized code for intel
cpus.
there are image processing and signal processing libs too, i think they have
fast dct and such stuff inside, like solaris' mlib.

i didn't checked it, and they are in .exe format (i think SFX), but we could
request for linux version.


A'rpi / Astral & ESP-team

--
mailto:arpi at thot.banki.hu
http://esp-team.scene.hu