MMX instruction and gcc

[Galloth]

Hi,
I want ask, if there is posibilities that gcc will be automaticaly
generates MMX instruction? I tried -mtune, -march  -mmmx. But gcc stil
generates code without MMX instruction. On net I found only
information about inline assembler function or citation from man page.
I tried to compile program for adding two arrays of 24 chars.

Thank for help
-- 
Jan Kastil
galloth@jabbim.cz