About SIMD benefits, I understood that new OMAP 2420 has SIMD support?
Some benchmarks done for XVID with and without SSE (SIMD of Intel Pentium family):

http://list.xvid.org/pipermail/xvid-...ry/004815.html

SIMD SSE brings big benefits (200-300%) for XVID decoding. Not familiar how well OMAP SIMD implementation and Intel SSE compares but probably it would make sense to take SIMD into use. This I suppose requires coding some routines in ARM assembler, though.