Quake III & the reciprocal square root

In the C source code of the famous game “Quake III — Arena” you can find an incredibly efficient piece of code that seems totally insane and incomprehensible! It is the code for computing the…

Adrian Boeing: Blog: Timing square root on the GPU

PDF) A Correctly Rounded Newton Step for the Reciprocal Square Root

Exploring Quake 3's Fast Inverse Square Root

Death of Quake 3's Inverse Square Root Hack, by Doug Foo

Fast Inverse Square Root — A Quake III Algorithm_哔哩哔哩_bilibili

Is Fast Inverse Square Root still Fast?

Quake III's or Fast InvSqrt() or 0x5F3759DF Algorithm

Revisiting The Fast Inverse Square Root - Is It Still Useful

Exploring Quake 3's Fast Inverse Square Root

0x5f3759df and the fast inverse square root : r/programming