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64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
/* Test of isnand() substitute.
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Copyright (C) 2007-2017 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
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#include <limits.h>
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#include "minus-zero.h"
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#include "infinity.h"
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#include "nan.h"
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#include "macros.h"
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int
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main ()
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{
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/* Finite values. */
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ASSERT (!isnand (3.141));
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ASSERT (!isnand (3.141e30));
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ASSERT (!isnand (3.141e-30));
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ASSERT (!isnand (-2.718));
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ASSERT (!isnand (-2.718e30));
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ASSERT (!isnand (-2.718e-30));
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ASSERT (!isnand (0.0));
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ASSERT (!isnand (minus_zerod));
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/* Infinite values. */
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ASSERT (!isnand (Infinityd ()));
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ASSERT (!isnand (- Infinityd ()));
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/* Quiet NaN. */
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ASSERT (isnand (NaNd ()));
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#if defined DBL_EXPBIT0_WORD && defined DBL_EXPBIT0_BIT
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/* Signalling NaN. */
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{
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#define NWORDS \
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((sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
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typedef union { double value; unsigned int word[NWORDS]; } memory_double;
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memory_double m;
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m.value = NaNd ();
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# if DBL_EXPBIT0_BIT > 0
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m.word[DBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (DBL_EXPBIT0_BIT - 1);
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# else
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m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
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^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
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# endif
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m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
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|= (unsigned int) 1 << DBL_EXPBIT0_BIT;
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ASSERT (isnand (m.value));
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}
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#endif
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return 0;
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}
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