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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     #ifndef Q3_VM    #ifdef __linux__      assert( !isnan(y) ); // bk010122 - FPE?    #endif    #endif    return y;}