uclibc-ng/libm/w_sqrtf.c

/* vi: set sw=4 ts=4: */
/* sqrtf for uClibc
 *
 * Copyright (C) 2002 by Erik Andersen <andersen@uclibc.org>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Library General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

/* 
 * wrapper for sqrt(x)
 */

#include "math.h"
#include "math_private.h"

#ifdef __STDC__
	float sqrtf(float x)		/* wrapper sqrt */
#else
	float sqrtf(x)			/* wrapper sqrt */
	float x;
#endif
{
#ifdef _IEEE_LIBM
	return __ieee754_sqrt(x);
#else
	float z;
	z = __ieee754_sqrt(x);
	if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
	if(x<0.0) {
	    return __kernel_standard(x,x,26); /* sqrt(negative) */
	} else
	    return z;
#endif
}