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Author Topic: Golfed code snippets  (Read 856 times)

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Offline _iPhoenix_

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Re: Golfed code snippets
« on: December 08, 2018, 04:28:09 am »
As far as weird/cool constants in golfed code goes, this is my absolute favorite.

From the Quake III Arena source code, a routine to calculate an inverse square root
Code: [Select]
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 f***?
   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;
}


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