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Don't trust your compiler. Your code is only fast if you're lucky.

I agree you can't trust your compiler, but you can control its behavior more reliably with __builtin_expect_with_probability

that's a nice example. on my M4, i measured 3.4s vs. 0.42s. honestly surprised there's ~10x improvement to be found.

as you've pointed out, you've literally micro-optimised this - isn't this what you'd expect? :)

But what is the resulting assembly? I would assume completely different!