Those disabled goodies in mplayer

[Tong <mlist4suntong@yahoo.com>]

Hi, 

I guess most of people is like me, seeing these messages over and over but
never pay attention:

MMX2 supported but disabled
SSE supported but disabled
SSE2 supported but disabled
3DNow supported but disabled
3DNowExt supported but disabled

This is what my mplayer outputs when it start decoding. I'm wondering how
to enable them so my decoding would be faster (I'm decoding from file to
file)

I searched the google, and seems no discussion on this either. Moreover,
they seems to be compile time options. I.e., they are disabled at compile
time, is that so? 

Beside, which one (or ones) should I enable for my AMD Athlon, if I could?

Please comment. Thanks

tong