1/* Macros for not-a-number.
2   Copyright (C) 2007-2010 Free Software Foundation, Inc.
3
4   This program is free software: you can redistribute it and/or modify
5   it under the terms of the GNU General Public License as published by
6   the Free Software Foundation; either version 3 of the License, or
7   (at your option) any later version.
8
9   This program is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12   GNU General Public License for more details.
13
14   You should have received a copy of the GNU General Public License
15   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
16
17
18/* NaNf () returns a 'float' not-a-number.  */
19
20/* The Compaq (ex-DEC) C 6.4 compiler chokes on the expression 0.0 / 0.0.  */
21#ifdef __DECC
22static float
23NaNf ()
24{
25  static float zero = 0.0f;
26  return zero / zero;
27}
28#else
29# define NaNf() (0.0f / 0.0f)
30#endif
31
32
33/* NaNd () returns a 'double' not-a-number.  */
34
35/* The Compaq (ex-DEC) C 6.4 compiler chokes on the expression 0.0 / 0.0.  */
36#ifdef __DECC
37static double
38NaNd ()
39{
40  static double zero = 0.0;
41  return zero / zero;
42}
43#else
44# define NaNd() (0.0 / 0.0)
45#endif
46
47
48/* NaNl () returns a 'long double' not-a-number.  */
49
50/* On Irix 6.5, gcc 3.4.3 can't compute compile-time NaN, and needs the
51   runtime type conversion.  */
52#ifdef __sgi
53static long double NaNl ()
54{
55  double zero = 0.0;
56  return zero / zero;
57}
58#else
59# define NaNl() (0.0L / 0.0L)
60#endif
61