lib/libc/minimal/source/math/sqrt.c

/*
 * Copyright (c) 2019 Vestas Wind Systems A/S
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <math.h>

double sqrt(double value)
{
	double sqrt = value / 3;
	int i;

	if (value <= 0) {
		return 0;
	}

	for (i = 0; i < 6; i++) {
		sqrt = (sqrt + value / sqrt) / 2;
	}

	return sqrt;
}