avcodec/x86/hevc: add avx2 dc idct

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/x86/hevc_idct: fix number of sse registers

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/x86/hevc_idct: fix function name in comment

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avfilter/vf_pullup: use ptrdiff_t as stride argument for dsp functions

This should avoid issues on x86_64

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avfilter/x86/vf_pullup: fix old typo

This makes C and MMX match, no change to fate as the differences where
apparently not sufficient to show up in fate

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>