3 static double calc_pow(double x, double y, double precision);
5 double pow(double x, double y)
7 if(y == 0.0 || y == -0.0) {
14 return fabs(x) < 1.0 ? INFINITY : 0.0;
17 return fabs(x) < 1.0 ? 0.0 : INFINITY;
19 return calc_pow(x, y, 1e-6);
22 static double calc_pow(double x, double y, double precision)
25 return 1.0 / calc_pow(x, -y, precision);
28 double p = calc_pow(x, y / 2.0, precision / 2.0);
32 return x * calc_pow(x, y - 1.0, precision);
35 return __builtin_sqrt(x);
37 return __builtin_sqrt(calc_pow(x, y * 2.0, precision * 2.0));