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In the readme for Turbobase64, they state:

> Only the non portable AVX2 based libraries are faster

The paper in OP is about 2 times as fast as their previous AVX2 code. I think they are superior to Turbobase64 here (though with more stringent hardware requirements).

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I agree and according to a steam hardware survey only 1% are using AVX2. AVX-512 is practically unused. And don't forget the billions ARM CPU's.

Their numbers are surely wrong? Firstly, AVX2 jumped from 1% to 5% in a month. Secondly, it looks to have been on every Intel processor this decade.

Even 5% sounds sketchy indeed. However, AVX2 (or Haswell New Instructions) hasn't quite been on every Intel processor this decade, rather only since the 4th generation (late 2013), and only in Core-branded processors.

It’s available, but the CPU would throttle itself to prevent overheating until very recent processors.

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