1 /* Emulation for sqrtl.
2 Contributed by Paolo Bonzini
4 Copyright 2002, 2003, 2007 Free Software Foundation, Inc.
6 This file is part of gnulib.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License along
19 with this program; if not, write to the Free Software Foundation,
20 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
29 /* A simple Newton-Raphson method. */
36 /* Check for negative numbers */
38 return (long double) sqrt(-1);
40 /* Check for zero, NANs and infinites */
41 if (x + x == x || x != x)
44 frexpl (x, &exponent);
45 y = ldexpl (x, -exponent / 2);
50 y = (y + x / y) * 0.5L;
53 while (delta != 0.0L);