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> No FPU usage (all integer maths, even for file size)

I wonder what is the significance of avoiding floating point math in a program that will spend most of its time waiting for user input.

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You are looking for the benchmarks: https://github.com/jarun/nnn/pull/84

Why does this provide such a speed up on modern CPUs?

Please head here: https://github.com/jarun/nnn/wiki/Performance

Don't know what the situation is like today, but not so long ago not all architectures supported floating point numbers. Math operations were emulated in software libraries, which was slow and buggy.

I get the sarcasm but probably a lot of that would depend on the calculation involved.

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