Function randn

dpdk/app/test-bbdev/test_bbdev_perf.c:1529–1544

Returns a random number drawn from a normal distribution * with mean of 0 and variance of 1 * Marsaglia algorithm */

 * Marsaglia algorithm
 */
static double
randn(int n)
{
	double S, Z, U1, U2, u, v, fac;

	do {
		U1 = (double)rand() / RAND_MAX;
		U2 = (double)rand() / RAND_MAX;
		u = 2. * U1 - 1.;
		v = 2. * U2 - 1.;
		S = u * u + v * v;
	} while (S >= 1 || S == 0);
	fac = sqrt(-2. * log(S) / S);
	Z = (n % 2) ? u * fac : v * fac;
	return Z;
}

static inline double
maxstar(double A, double B)