The lavf-ffm test results change because ffmenc writes
AVCodecContext.flags/flags2 and the defaults for those change.

E.g. non_linear_quant mpeg2video private option.
Signed-off-by: Anton Khirnov <anton@khirnov.net>

Assemblers don't understand ! in %if statements.

Also implement sse2/ssse3/avx versions.

This allows combining multiple conditionals in a single statement.

This reverts commit fc115c80.

Tests are broken.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

MVDATA may or may not be transmitted. If it is not, both
dmv_x and dmv_y is to be assumed zero.

This may not trigger wrong picture in all systems, but
it's a bug nevertheless. Fixes SA10116.vc1 on my 64-bit
Windows 7.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>