BFIN optimizations have been removed in
commit 880e2aa23645ed9871c66ee1cbd00f93c72d2d73
The last revission with the optimizations is fa4e17c14035ebf43130fb369e1728cdd98d0b72

If you want to maintain these (or other) BFIN optimizations in ffmpeg, then please
contact ffmpeg-devel@ffmpeg.org