Add fixed point implementation of functions for generating tables.

Signed-off-by: Nedeljko Babic <nedeljko.babic@imgtec.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Doesn't change generated code, just is more consistent
and a bit less error-prone.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>

This is required for SIMD optimisations.

Signed-off-by: Mans Rullgard <mans@mansr.com>

Signed-off-by: Mans Rullgard <mans@mansr.com>

Originally committed as revision 23720 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23647 to svn://svn.ffmpeg.org/ffmpeg/trunk