[FFmpeg-devel] [PATCH] SSE2 Xvid idct

[Alexander Strange]

This adds skal's sse2 idct and uses it as the xvid idct when available.

I merged two shuffles into the permutation and changed the zero- 
skipping some - it's fastest in MMX and not really worth doing for the  
first three rows. Their right halfs are still usually all zero, but  
adding the branch to check for it is a net loss. The best thing for  
speed would be switching IDCTs by counting the last nonzero  
coefficient position, but that's something for later.

xvididctheader - makes a new header so I don't add any more extern  
declarations in .c files.
sse2-permute - the new permutation; it might not have a specific  
enough name, but it should work as well for simpleidct as this if I  
can get back to that.
sse2-xvid-idct.diff + idct_sse2_xvid.c - the IDCT

The URLs in the header (copied from idct_mmx_xvid and the original  
nasm source) are broken at the moment, but archive.org URLs are longer  
than 80 characters, so I left them like they are.

skal agreed it could be under LGPL in the last thread.

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