[FFmpeg-devel] avfilter/vf_threshold : add checkasm and avx2 version for threshold8

[Martin Vignali]

Hello,

In attach patch to add a checkasm test for the recently added threshold8
SIMD

also add AVX2 version

Checkasm result :
threshold8_c: 584.8
threshold8_sse4: 65.0
threshold8_avx2: 43.5


001 : create ff_threshold_init_func in order to simplify checkasm write
(more like previous checkasm test for filter)

002 : Add checkasm test for vf_threshold

003 : make macro for existing asm, in order to add avx2 version

004 : add avx2 version for threshold 8

005 : cosmetic indent asm

Martin
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