Turbobase64: A portable scalar implementation can beat SIMD and saturates the fastest networks and fastest SSDs.
It is faster than SSE on Intel/AMD and SIMD NEON on ARM see benchmark at Turbo Base64: https://github.com/powturbo/TurboBase64
It is faster than SSE on Intel/AMD and SIMD NEON on ARM see benchmark at Turbo Base64: https://github.com/powturbo/TurboBase64
> 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).
Not to say that Turbobase64 isn't impressive, but it's not at all the same level of performance.
It is impossible to have the speed of a good memcpy when you're copying 33% more like in base64.