Most advanced piece of computer code ever written

 https://www.quora.com/What-is-the-most-advanced-computer-program

float Q_rsqrt( float number ) 
{ 
long i; 
float x2, y; 
const float threehalfs = 1.5F; 
 
x2 = number * 0.5F; 
y = number; 
i = * ( long * ) &y; // evil floating point bit level hacking 
i = 0x5f3759df - ( i >> 1 ); // what the fuck?  
y = * ( float * ) &i; 
y = y * ( threehalfs - ( x2 * y * y ) ); // 1st iteration 
// y = y * ( threehalfs - ( x2 * y * y ) ); // 2nd iteration, this can be removed 
 
return y; 
}