1 /* Test of isnand() substitute.
2 Copyright (C) 2007-2011 Free Software Foundation, Inc.
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.
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.
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/>. */
17 /* Written by Bruno Haible <bruno@clisp.org>, 2007. */
21 #include "minus-zero.h"
29 ASSERT (!isnand (3.141));
30 ASSERT (!isnand (3.141e30));
31 ASSERT (!isnand (3.141e-30));
32 ASSERT (!isnand (-2.718));
33 ASSERT (!isnand (-2.718e30));
34 ASSERT (!isnand (-2.718e-30));
35 ASSERT (!isnand (0.0));
36 ASSERT (!isnand (minus_zerod));
37 /* Infinite values. */
38 ASSERT (!isnand (1.0 / 0.0));
39 ASSERT (!isnand (-1.0 / 0.0));
41 ASSERT (isnand (NaNd ()));
42 #if defined DBL_EXPBIT0_WORD && defined DBL_EXPBIT0_BIT
46 ((sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
47 typedef union { double value; unsigned int word[NWORDS]; } memory_double;
50 # if DBL_EXPBIT0_BIT > 0
51 m.word[DBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (DBL_EXPBIT0_BIT - 1);
53 m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
54 ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
56 m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
57 |= (unsigned int) 1 << DBL_EXPBIT0_BIT;
58 ASSERT (isnand (m.value));