Fast inverse square root, sometimes referred to as Fast InvSqrt() or by the hexadecimal constant 0x5F3759DF, is an algorithm that estimates 1 / x {\textstyle 1/{\sqrt {x}}} , the reciprocal (or multiplicative inverse) of the square root of a 32-bit floating-point number x {\displaystyle x} in IEEE 754 floating-point format. The algorithm is best known for its implementation in 1999 in Quake III Arena.
Fast inverse square root, sometimes referred to as Fast InvSqrt() or by the hexadecimal constant 0x5F3759DF, is an algorithm that estimates 1 / x {\textstyle 1/{\sqrt {x}}} , the reciprocal (or multiplicative inverse) of the square root of a 32-bit floating-point number x {\displaystyle x} in IEEE 754 floating-point format. The algorithm is best known for its implementation in 1999 in Quake III Arena.
Source: Wikipedia "Fast inverse square root" · CC BY-SA 4.0
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