1 /* Emulation for sqrtl.
2 Contributed by Paolo Bonzini
4 Copyright 2002, 2003 Free Software Foundation, Inc.
6 This file is part of gnulib.
8 gnulib is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published
10 by the Free Software Foundation; either version 2.1, or (at your option)
13 gnulib is distributed in the hope that it will be useful, but WITHOUT
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
16 License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with gnulib; see the file COPYING.LIB. If not, write to the Free
20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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);