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/* Test signaling NaNs in issignaling, isnan, isinf, and similar functions.
Copyright (C) 2008-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#define _GNU_SOURCE 1
#include <stdio.h>
#include <math.h>
#include <float.h>
#include <fenv.h>
#include <signal.h>
#include <setjmp.h>
#include <math-tests.h>
#include <support/check.h>
#ifdef __SUPPORT_SNAN__
static sigjmp_buf sigfpe_buf;
static void
myFPsighandler (int signal)
{
siglongjmp (sigfpe_buf, 1);
}
static int errors = 0;
#define CHECK(testname, expr) \
do { \
feclearexcept (FE_ALL_EXCEPT); \
feenableexcept (FE_ALL_EXCEPT); \
if (sigsetjmp (sigfpe_buf, 0)) \
{ \
printf ("%s raised SIGFPE\n", testname); \
++errors; \
} \
else if (!(expr)) \
{ \
printf ("Failure: %s\n", testname); \
++errors; \
} \
} while (0)
#define TEST_FUNC(NAME, FLOAT, SUFFIX) \
static void \
NAME (void) \
{ \
/* Variables are declared volatile to forbid some compiler \
optimizations. */ \
volatile FLOAT Inf_var, qNaN_var, zero_var, one_var; \
/* A sNaN is only guaranteed to be representable in variables with */ \
/* static (or thread-local) storage duration. */ \
static volatile FLOAT sNaN_var = __builtin_nans ## SUFFIX (""); \
static volatile FLOAT minus_sNaN_var = -__builtin_nans ## SUFFIX (""); \
fenv_t saved_fenv; \
\
zero_var = 0.0; \
one_var = 1.0; \
qNaN_var = __builtin_nan ## SUFFIX (""); \
Inf_var = one_var / zero_var; \
\
(void) &zero_var; \
(void) &one_var; \
(void) &qNaN_var; \
(void) &sNaN_var; \
(void) &minus_sNaN_var; \
(void) &Inf_var; \
\
fegetenv (&saved_fenv); \
\
CHECK (#FLOAT " issignaling (qNaN)", !issignaling (qNaN_var)); \
CHECK (#FLOAT " issignaling (-qNaN)", !issignaling (-qNaN_var)); \
CHECK (#FLOAT " issignaling (sNaN)", \
SNAN_TESTS (FLOAT) ? issignaling (sNaN_var) : 1); \
CHECK (#FLOAT " issignaling (-sNaN)", \
SNAN_TESTS (FLOAT) ? issignaling (minus_sNaN_var) : 1); \
CHECK (#FLOAT " isnan (qNaN)", isnan (qNaN_var)); \
CHECK (#FLOAT " isnan (-qNaN)", isnan (-qNaN_var)); \
CHECK (#FLOAT " isnan (sNaN)", \
SNAN_TESTS (FLOAT) ? isnan (sNaN_var) : 1); \
CHECK (#FLOAT " isnan (-sNaN)", \
SNAN_TESTS (FLOAT) ? isnan (minus_sNaN_var) : 1); \
CHECK (#FLOAT " isinf (qNaN)", !isinf (qNaN_var)); \
CHECK (#FLOAT " isinf (-qNaN)", !isinf (-qNaN_var)); \
CHECK (#FLOAT " isinf (sNaN)", \
SNAN_TESTS (FLOAT) ? !isinf (sNaN_var) : 1); \
CHECK (#FLOAT " isinf (-sNaN)", \
SNAN_TESTS (FLOAT) ? !isinf (minus_sNaN_var) : 1); \
CHECK (#FLOAT " isfinite (qNaN)", !isfinite (qNaN_var)); \
CHECK (#FLOAT " isfinite (-qNaN)", !isfinite (-qNaN_var)); \
CHECK (#FLOAT " isfinite (sNaN)", \
SNAN_TESTS (FLOAT) ? !isfinite (sNaN_var) : 1); \
CHECK (#FLOAT " isfinite (-sNaN)", \
SNAN_TESTS (FLOAT) ? !isfinite (minus_sNaN_var) : 1); \
CHECK (#FLOAT " isnormal (qNaN)", !isnormal (qNaN_var)); \
CHECK (#FLOAT " isnormal (-qNaN)", !isnormal (-qNaN_var)); \
CHECK (#FLOAT " isnormal (sNaN)", \
SNAN_TESTS (FLOAT) ? !isnormal (sNaN_var) : 1); \
CHECK (#FLOAT " isnormal (-sNaN)", \
SNAN_TESTS (FLOAT) ? !isnormal (minus_sNaN_var) : 1); \
CHECK (#FLOAT " fpclassify (qNaN)", (fpclassify (qNaN_var)==FP_NAN)); \
CHECK (#FLOAT " fpclassify (-qNaN)", (fpclassify (-qNaN_var)==FP_NAN)); \
CHECK (#FLOAT " fpclassify (sNaN)", \
SNAN_TESTS (FLOAT) ? fpclassify (sNaN_var) == FP_NAN : 1); \
CHECK (#FLOAT " fpclassify (-sNaN)", \
SNAN_TESTS (FLOAT) ? fpclassify (minus_sNaN_var) == FP_NAN : 1); \
\
fesetenv (&saved_fenv); /* restore saved fenv */ \
} \
TEST_FUNC (float_test, float, f)
TEST_FUNC (double_test, double, )
TEST_FUNC (ldouble_test, long double, l)
#endif
static int
do_test (void)
{
#ifdef __SUPPORT_SNAN__
signal (SIGFPE, &myFPsighandler);
float_test ();
double_test ();
ldouble_test ();
return errors != 0;
#else
FAIL_UNSUPPORTED ("compiler does not support -fsignaling-nans");
#endif
}
#include <support/test-driver.c>
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