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 3 of the License, or
11 (at your option) any later version.
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
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
28 /* A simple Newton-Raphson method. */
39 /* Check for negative numbers */
41 return (long double) sqrt(-1);
43 /* Check for zero and infinites */
47 frexpl (x, &exponent);
48 y = ldexpl (x, -exponent / 2);
53 y = (y + x / y) * 0.5L;
56 while (delta != 0.0L);