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Diffstat (limited to 'tests/test-isnanl.c')
-rw-r--r-- | tests/test-isnanl.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/tests/test-isnanl.c b/tests/test-isnanl.c new file mode 100644 index 0000000000..534f15b177 --- /dev/null +++ b/tests/test-isnanl.c @@ -0,0 +1,77 @@ +/* Test of isnanl() substitute. + Copyright (C) 2007 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 2, 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, write to the Free Software Foundation, + Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ + +/* Written by Bruno Haible <bruno@clisp.org>, 2007. */ + +#include <config.h> + +#if HAVE_LONG_DOUBLE + +#include "isnanl.h" + +#include <limits.h> +#include <stdlib.h> + +#define ASSERT(expr) if (!(expr)) abort (); + +int +main () +{ + /* Finite values. */ + ASSERT (!isnanl (3.141L)); + ASSERT (!isnanl (3.141e30L)); + ASSERT (!isnanl (3.141e-30L)); + ASSERT (!isnanl (-2.718L)); + ASSERT (!isnanl (-2.718e30L)); + ASSERT (!isnanl (-2.718e-30L)); + /* Infinite values. */ + ASSERT (!isnanl (1.0L / 0.0L)); + ASSERT (!isnanl (-1.0L / 0.0L)); + /* Quiet NaN. */ + ASSERT (isnanl (0.0L / 0.0L)); +#if defined LDBL_EXPBIT0_WORD && defined LDBL_EXPBIT0_BIT + /* Signalling NaN. */ + { + #define NWORDS \ + ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int)) + typedef union { long double value; unsigned int word[NWORDS]; } + memory_long_double; + memory_long_double m; + m.value = 0.0L / 0.0L; +# if LDBL_EXPBIT0_BIT > 0 + m.word[LDBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (LDBL_EXPBIT0_BIT - 1); +# else + m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)] + ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1); +# endif + m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)] + |= (unsigned int) 1 << LDBL_EXPBIT0_BIT; + ASSERT (isnanl (m.value)); + } +#endif + return 0; +} + +#else + +int +main () +{ + return 0; +} + +#endif |