untested (no g200 mga or whatever i would need ...)
experimental sse2 version (even less tested as no p4 either ...)
sse2 version would need 16-byte aligned src & dst else sig11
sse2 version is disabled by default


git-svn-id: file:///var/local/repositories/mplayer/trunk/postproc@5338 b3059339-0415-0410-9bf9-f77b7e298cf2