[FFmpeg-devel] swscale/rgb2rgb : add X86_64 SIMD (SSSE3 and AVX2) for shuffly_bytes func

[Martin Vignali]

Hello,

Patch in attach add SIMD for the 5 shuffle_bytes func for rgb2rgb
The new SIMD are write using external ASM.

Also add checkasm test for theses func
Restricted to x86_64, because the scalar part doesn't compile on x86_32

I consider for the scalar part that the src_size value is a multiple of 4
(because the shuffle is for 4 bytes)

Pass fate test on X86_64 and X86_32 (os 10.12)


Martin
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