https://www.youtube.com/watch?v=p8u_k2LIZyo

Fast Inverse Square Root — A Quake III Algorithm
In this video we will take an in depth look at the fast inverse square root and see where the mysterious number 0x5f3759df comes from. This algorithm became ...
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유명하신 과메기 형님의 1/sqrt(n) 최적화.
난 못알아듣겠음.
구공 형님 점심 드셨나요
그 유명한 매직코드군