MPlayer and SSE

compucoder · Posted: Fri Dec 13, 2002 2:37 am Post subject: MPlayer and SSE

Hey,

I installed MPlayer today and when I ran it i got the output below - it works fine - what I am concerned about is the SSE supported but disabled line???

Did i not use the proper settings in make.conf?

i used -march=pentium3 -fomit-frame-pointer -O3

i thought SSE support was implied by pentium3

or it being disabled means something entirely different?

i know my chip supports SSE - CPUID indicates MMX and SSE support

Did i cheat myself out of a more optimal system...again, heh

thanx

Output::

CPU: Intel Celeron 2/Pentium III Coppermine,Geyserville (Family: 6, Stepping: 10)
SSE supported but disabled
CPUflags: MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 0 SSE2: 0
Compiled for x86 CPU with extensions: MMX MMX2

Pigeon · Guru Joined: 21 Jun 2002 Posts: 307

*shrug* try recompiling with -msse and see what happens.

compucoder · Posted: Fri Dec 13, 2002 4:31 am Post subject:

recompiled it

i was mistaken....sse isnt implied in pentium3

sucks I built the whole system missing this option.

oh well - will have alot of mistakes worked out before 1.4 release this month!

also, i noticed another setting for the x86 - -mfpmath=sse for the math cpu

anyone think this would make a difference(whether good or bad)

thanx

Tuna · Guru Joined: 19 Jul 2002 Posts: 485 Location: Berlin

well, just mplayer was compiled without sse support... just add 'sse' to your USEFLAGS and recompile mplayer.
mplayer has a special --disable-sse configure variable that used if your SSE USEFLAG is missing.. i dont know if other packages are affected too. same is for mmx too btw..

edit: but youre trying to tel me that these CXFLAGS whatever still accept some sse specials, although march=pentium3? im curious if that is really true.. are we missing some nice and neat improvements here by default?

compucoder · Posted: Fri Dec 13, 2002 4:30 pm Post subject:

i am gonna redo my system this weekend applying what I have learned regarding optimizations and see if it makes a difference

I am gonna make sure i add -msse -mmmx to the CPUFLAGS as well as that option to associate sse with the Math Co via - -mfpmath=sse

who knows might just tap into some options that make a noticeable difference

will post my results when I get the system re-installed

P.S. gonna reread the GCC manual on x86 again and see what else i can throw in there that might improve things over what is implied in the -march and -O settings

Lin_Matt · Posted: Fri Dec 13, 2002 9:31 pm Post subject:

compucoder · Posted: Sun Dec 15, 2002 7:13 pm Post subject:

i tried the reinstall -

I actually wiped the whole drive and went from square 1 - stage1 install

i added those flags right from the beginning.

Didnt have any problems with things breaking. KDE installed without a hick-up.....except.....

It took 26 hours to emerge kde from a fresh system.

It usually takes me 16 hours. There is quite a bit to install - i think 72 packages on a fresh gentoo system.

Thats 10 hours of extra compiling time for the same result. I dont see even the smallest improvement with -msse, -mmmx, -mfpmath=sse

wish I saw the above post earlier

- took in total over 30 hours to have a working system again and with no benefit. But hey, gotta try new things once in a while