[MPlayer-users] gcc 2.95.3 vs. gcc 3.2

[Per Wigren]

Hi!

Please try again with "-mfpmath=sse" and "-mfpmath=sse,387" (may be buggy) !
Anyway, mplayer is quite asm-optimized, isn't it? gcc v3.2 almost always 
create much faster code on pure c/c++ programs... 

What was the mplayer commandline you used? I want to try this on my athlon..

Regards
Per Wigren


Friday 30 August 2002 17.29 skrev Arpi:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> Hi,
>
> I've done some quick comparson between 2.95.3 and brand-new 3.2 version.
> Note, that 3.2 supports pentium4 target/optimization, so it should result
> better code - in theory.
>
> System: 1.8ghz p4, 512mb rd800 ram, i850, abit th7-ii raid mb, ibm 80g hdd
> MPlayer: CVS version, almost every auto-detectable option present and
> detected
>
> 2.95.3 compilation time:  (./configure;time make)
>
> real    2m0.673s
> user    1m51.150s
> sys     0m8.550s
>
> (repeated to verify results - error under 1%)
>
> 3.2 time: (./configure --cc=gcc-3.2;time make)
>
> real    3m1.728s
> user    2m49.810s
> sys     0m10.930s
>
> so, about 50% slower. ok, we hope the result will be faster so it does
> worth it. (gcc 2.95.3 -march & -mcpu was i686, 3.2's was pentium4,
> both auto-selected by ./configure)
>
> File:  /3a/MPlayer/benchmark/testsuite2/Star_Wars_Episode_1.avi
> VIDEO:  [DIV3]  720x576  24bpp  25.00 fps  1858.5 kbps (226.9 kbyte/s)
> gcc 2.93.5 : 22.070 : 21.985 : 22.038
> gcc 3.2    : 22.328 : 22.354 : 22.370
>
> -> slower at high bitrate
>
> File:  /3a/MPlayer/benchmark/testsuite2/405divx_sm_v2[1].avi
> VIDEO:  [DIV3]  356x240  24bpp  30.00 fps  343.0 kbps (41.9 kbyte/s)
> gcc 2.93.5 : 4.054 : 4.052 : 4.072
> gcc 3.2    : 4.062 : 4.042 : 4.086
>
> -> ~ same at low bitrate
>
> File:  /3a/MPlayer/benchmark/testsuite2/sample.light.it.up.avi
> VIDEO:  [DIV3]  640x352  24bpp  23.98 fps  823.5 kbps (100.5 kbyte/s)
> gcc 2.93.5 : : 3.983 : 3.953 : 3.949
> gcc 3.2    : : 4.086 : 4.045 : 4.050
>
> -> bit slower at middle bitrate
>
> I'm just wondering why do people prefer teh slow buggy 3.x series over the
> good old, working 2.95.3 ?
>
> Oh, i've found it!!!
>
> -rwxr-xr-x    1 root     root      2408836 Aug 30 16:47 mplayer.295
> -rwxr-xr-x    1 root     root      2336740 Aug 30 16:47 mplayer.32
>
> 3.2 produces 3% smaller (stripped size) binary :)
>
>
> A'rpi / Astral & ESP-team
>
> --
> Developer of MPlayer, the Movie Player for Linux - http://www.MPlayerHQ.hu
>
> _______________________________________________
> RTFM!!!  http://www.MPlayerHQ.hu/DOCS
> Search:  http://www.MPlayerHQ.hu/cgi-bin/htsearch
> http://mplayerhq.hu/mailman/listinfo/mplayer-users