[FFmpeg-devel] libavcodec/lossless_videodsp : add add_bytes AVX2

[Martin Vignali]

Hello,

In attach patch to add AVX2 version for add_bytes

0001-libavcodec-lossless_videodsp-add-add_bytes-avx2-vers :
add AVX2 version

pass fate-test for me (os 10.12, x86_64)

checkasm result : (Kaby Lake) (run 10 times, and i took the fastest version)
checkasm: all 2 tests passed
add_bytes_c: 108.7
add_bytes_sse2: 26.5
add_bytes_avx2: 15.5


0002-libavcodec-lossless_video_dsp-cosmetic-add-better-se:
only cosmetic
like the ref c function declaration in asm file is not consistent between
each asm file
i think a better separator for each function make the file easier to read

also add the c declaration for add bytes in comment


Martin
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