高速逆平方根（Fast Inverse Square Root）は、Quake IIIで有名になったビットレベルの近似法です。0x5f3759dfというマジックナンバーで初期値を作り、ニュートン法1回で良好な精度を得ます。本稿ではその仕組みと、現代CPUのrsqrt命令との使い分けを簡潔に整理します。

👉 Learn how to find the inverse of a function. The inverse of a function is a function that reverses the "effect" of the original function. One important property of the inverse of a function is that ...

A C++ implementation of a fast square root algorithm inspired by the famous "fast inverse square root" technique originally used in Quake III Arena. This project implements a high-performance square ...

This repository contains a small C project that implements and exercises the famous fast inverse square root routine popularised by Quake III Arena. The code builds with CMake, exposes the function ...

Abstract: A novel class of neural dynamics, Zhang dynamics (ZD), has been recently proposed for online time-varying problem solving. The design method of ZD is based on an indefinite error-monitoring ...