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diff --git a/tests/test-isnand.h b/tests/test-isnand.h
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+/* Test of isnand() substitute.
+ Copyright (C) 2007-2008 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
+
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "nan.h"
+
+#define ASSERT(expr) \
+ do \
+ { \
+ if (!(expr)) \
+ { \
+ fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
+ fflush (stderr); \
+ abort (); \
+ } \
+ } \
+ while (0)
+
+/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0.
+ So we use -zero instead. */
+double zero = 0.0;
+
+int
+main ()
+{
+ /* Finite values. */
+ ASSERT (!isnand (3.141));
+ ASSERT (!isnand (3.141e30));
+ ASSERT (!isnand (3.141e-30));
+ ASSERT (!isnand (-2.718));
+ ASSERT (!isnand (-2.718e30));
+ ASSERT (!isnand (-2.718e-30));
+ ASSERT (!isnand (0.0));
+ ASSERT (!isnand (-zero));
+ /* Infinite values. */
+ ASSERT (!isnand (1.0 / 0.0));
+ ASSERT (!isnand (-1.0 / 0.0));
+ /* Quiet NaN. */
+ ASSERT (isnand (NaNd ()));
+#if defined DBL_EXPBIT0_WORD && defined DBL_EXPBIT0_BIT
+ /* Signalling NaN. */
+ {
+ #define NWORDS \
+ ((sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
+ typedef union { double value; unsigned int word[NWORDS]; } memory_double;
+ memory_double m;
+ m.value = NaNd ();
+# if DBL_EXPBIT0_BIT > 0
+ m.word[DBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (DBL_EXPBIT0_BIT - 1);
+# else
+ m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
+ ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
+# endif
+ m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
+ |= (unsigned int) 1 << DBL_EXPBIT0_BIT;
+ ASSERT (isnand (m.value));
+ }
+#endif
+ return 0;
+}