October 22, 20187 yr I was developing the benchmark on SB-E platform and at the time I performed a lot of testing. AVX had zero inpact on performance when running on SB (Core and Xeon series - those do support AVX). You can try it yourself - either by using Windows 7 non-SP and SP1... or the built-in function of x265, the CPU features override (which is much more convenient). AVX2 on Haswell and later improves the performance a lot. AVX1 perhaps helps too on some architectures, but certainly not on SB/IB.
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