https://en.wikipedia.org/wiki/Fast_inverse_square_root Not exactly SQRT, but. | Hacker News

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		atoko on Sept 28, 2016 \| parent \| context \| favorite \| on: Not Just Any Old Geek https://en.wikipedia.org/wiki/Fast_inverse_square_root Not exactly SQRT, but.

emodendroket on Sept 28, 2016 [–]

Also an incredibly specialized case and in those kinds of extremely performance-intensive scenarios it might still make sense.

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