romcc and EPIA

[SONE Takeshi]

I noticed romcc has support for MMX/SSE registers and epia/Config.lb
does not use it. Is there any problem using MMX registers on a C3?
I also wonder why -mcpu=p3 is required to enable MMX support of romcc.
IIRC, MMX has been supported since Pentium MMX and up, and Pentium III
adds SSE.
Isn't it better to have options like -mmmx and -msse, instead of
-mcpu=<name>. There are too many CPUs.