Mercurial > hg > octave-nkf > gnulib-hg
changeset 8231:7a8f0ae8b61c
Tests for module 'isnan-nolibm'.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Sat, 24 Feb 2007 19:09:57 +0000 |
parents | fc7bcbeadfee |
children | 00b91d5c179c |
files | ChangeLog modules/isnan-nolibm-tests tests/test-isnan.c |
diffstat | 3 files changed, 79 insertions(+), 0 deletions(-) [+] |
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--- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,8 @@ 2007-02-24 Bruno Haible <bruno@clisp.org> + * modules/isnan-nolibm-tests: New file. + * tests/test-isnan.c: New file. + * modules/isnan-nolibm: New file. * lib/isnan.h: New file. * lib/isnan.c: New file.
new file mode 100644 --- /dev/null +++ b/modules/isnan-nolibm-tests @@ -0,0 +1,12 @@ +Files: +tests/test-isnan.c + +Depends-on: + +configure.ac: +gl_DOUBLE_EXPONENT_LOCATION + +Makefile.am: +TESTS += test-isnan +check_PROGRAMS += test-isnan +
new file mode 100644 --- /dev/null +++ b/tests/test-isnan.c @@ -0,0 +1,64 @@ +/* Test of isnan() 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> + +#include "isnan.h" + +#include <limits.h> +#include <stdlib.h> + +#define ASSERT(expr) if (!(expr)) abort (); + +int +main () +{ + /* Finite values. */ + ASSERT (!isnan (3.141)); + ASSERT (!isnan (3.141e30)); + ASSERT (!isnan (3.141e-30)); + ASSERT (!isnan (-2.718)); + ASSERT (!isnan (-2.718e30)); + ASSERT (!isnan (-2.718e-30)); + /* Infinite values. */ + ASSERT (!isnan (1.0 / 0.0)); + ASSERT (!isnan (-1.0 / 0.0)); + /* Quiet NaN. */ + ASSERT (isnan (0.0 / 0.0)); +#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 = 0.0 / 0.0; +# 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 (isnan (m.value)); + } +#endif + return 0; +}