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Honestly I have no idea. You can try it yourself, or put it through godbolt:

https://gist.github.com/ityonemo/f34e0d3b4891f481863980a3142...

Note it could also be platform dependent. I'll give it a whirl on my own (new) machine.

Do you think that it may be caused by use of comptime? I have not looked at the benchmark implementations, but that kind of struck me as a reason

Well, I ran it again and now it's 10% slower than rust (the best rust impls have gotten better since I last tried); I think there's a simd optimization I'm missing, I'm not doing simd operations in the "pairs" phase

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