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2025-01-01T09:24:36
maint: run 'make update-copyright'
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/* Tests of quiet not-a-number.
Copyright (C) 2023-2025 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 <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2023. */
#include <config.h>
/* Specification. */
#include "nan.h"
#include <stdio.h>
#include "fpe-trapping.h"
#if HAVE_FPE_TRAPPING
# include <fenv.h>
# include "macros.h"
float volatile resultf;
double volatile resultd;
long double volatile resultl;
int
main ()
{
/* Fetch the NaN values before we start watching out for FE_INVALID
exceptions, because the division 0.0 / 0.0 itself also raises an
FE_INVALID exception.
The use of 'volatile' prevents the compiler from doing constant-folding
optimizations on these values. An alternative, for GCC only, would be
the command-line option '-fsignaling-nans'. */
float volatile nanf = NaNf ();
double volatile nand = NaNd ();
long double volatile nanl = NaNl ();
/* Check that the values are really quiet. */
/* Clear FE_INVALID exceptions from past operations. */
feclearexcept (FE_INVALID);
/* An FE_INVALID exception shall trigger a SIGFPE signal, which by default
terminates the program. */
if (sigfpe_on_invalid () < 0)
{
fputs ("Skipping test: trapping floating-point exceptions are not supported on this machine.\n", stderr);
return 77;
}
resultf = nanf + 42.0f;
resultd = nand + 42.0;
resultl = nanl + 42.0L;
return test_exit_status;
}
#else
/* No HAVE_FPE_TRAPPING available.
We could use the various alternative approaches from
libgfortran/config/fpu-*.h, but that's not worth it. */
int
main ()
{
fputs ("Skipping test: feenableexcept not available\n", stderr);
return 77;
}
#endif