/* Emulation for sqrtl.
Contributed by Paolo Bonzini
- Copyright 2002, 2003 Free Software Foundation, Inc.
+ Copyright 2002, 2003, 2007, 2009, 2010 Free Software Foundation, Inc.
This file is part of gnulib.
- This program is free software; you can redistribute it and/or modify
+ This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
+ the Free Software Foundation; either version 3 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 General Public License for more details.
- You should have received a copy of the GNU 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. */
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
-#include <float.h>
+#include <config.h>
+
+/* Specification. */
#include <math.h>
-#include "mathl.h"
+#include <float.h>
/* A simple Newton-Raphson method. */
long double
-sqrtl(long double x)
+sqrtl (long double x)
{
long double delta, y;
int exponent;
+ /* Check for NaN */
+ if (isnanl (x))
+ return x;
+
/* Check for negative numbers */
if (x < 0.0L)
- return (long double) sqrt(-1);
+ return (long double) sqrt (-1);
- /* Check for zero, NANs and infinites */
- if (x + x == x || x != x)
+ /* Check for zero and infinites */
+ if (x + x == x)
return x;
frexpl (x, &exponent);