[FFmpeg-devel] avcodec/losslessvideodsp : add avx2 for add_left_pred

[Martin Vignali]

Hello,

patchs in attach add avx2 version for add_left_pred

Pass fate test for me

checkasm test (kaby lake os 10.12)
with width = 1024

add_left_pred_zero_c: 1229.7
add_left_pred_zero_ssse3: 269.7
add_left_pred_zero_avx2: 217.9

0001-checkasm-llviddsp-test-return-of-add_left_pred-16
Modify the checkasm test in order to test the return value of the function

0002-avcodec-x86-lossless_videodsp.asm-make-macro-for-add
Create a macro for the SSSE3 version in order to add the avx2 version

0003-avcodec-x86-lossless_videodsp-add-avx2-version-for-a
Add the avx2 version

Martin
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