Originally committed as revision 940 to svn://svn.ffmpeg.org/ffmpeg/trunk

takes the most time, and it allows for more efficient unaligned access
and better control over memory latencies.

Originally committed as revision 711 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 710 to svn://svn.ffmpeg.org/ffmpeg/trunk

allows better scheduling of the memory accesses, and is portable among
all compilers.

Originally committed as revision 709 to svn://svn.ffmpeg.org/ffmpeg/trunk