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glibc/math/test-fenv.c
Paul Eggert 5a82c74822 Prefer https to http for gnu.org and fsf.org URLs 
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:

sed -ri '
  s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
  s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
  $(find $(git ls-files) -prune -type f \
      ! -name '*.po' \
      ! -name 'ChangeLog*' \
      ! -path COPYING ! -path COPYING.LIB \
      ! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
      ! -path manual/texinfo.tex ! -path scripts/config.guess \
      ! -path scripts/config.sub ! -path scripts/install-sh \
      ! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
      ! -path INSTALL ! -path  locale/programs/charmap-kw.h \
      ! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
      ! '(' -name configure \
            -execdir test -f configure.ac -o -f configure.in ';' ')' \
      ! '(' -name preconfigure \
            -execdir test -f preconfigure.ac ';' ')' \
      -print)

and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:

  chmod a+x sysdeps/unix/sysv/linux/riscv/configure
  # Omit irrelevant whitespace and comment-only changes,
  # perhaps from a slightly-different Autoconf version.
  git checkout -f \
    sysdeps/csky/configure \
    sysdeps/hppa/configure \
    sysdeps/riscv/configure \
    sysdeps/unix/sysv/linux/csky/configure
  # Omit changes that caused a pre-commit check to fail like this:
  # remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
  git checkout -f \
    sysdeps/powerpc/powerpc64/ppc-mcount.S \
    sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
  # Omit change that caused a pre-commit check to fail like this:
  # remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
  git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 02:43:31 -07:00

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/* Copyright (C) 1997-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Jaeger <aj@suse.de> and
Ulrich Drepper <drepper@cygnus.com>, 1997.
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/>. */
/* Tests for ISO C99 7.6: Floating-point environment */
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
#include <complex.h>
#include <math.h>
#include <float.h>
#include <fenv.h>
#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/wait.h>
#include <sys/resource.h>
#include <math-tests.h>
/*
Since not all architectures might define all exceptions, we define
a private set and map accordingly.
*/
#define NO_EXC 0
#define INEXACT_EXC 0x1
#define DIVBYZERO_EXC 0x2
#define UNDERFLOW_EXC 0x04
#define OVERFLOW_EXC 0x08
#define INVALID_EXC 0x10
#define ALL_EXC \
(INEXACT_EXC | DIVBYZERO_EXC | UNDERFLOW_EXC | OVERFLOW_EXC \
| INVALID_EXC)
static int count_errors;
#if FE_ALL_EXCEPT
/* Test whether a given exception was raised. */
static void
test_single_exception (short int exception,
short int exc_flag,
fexcept_t fe_flag,
const char *flag_name)
{
if (exception & exc_flag)
{
if (fetestexcept (fe_flag))
printf (" Pass: Exception \"%s\" is set\n", flag_name);
else
{
printf (" Fail: Exception \"%s\" is not set\n", flag_name);
++count_errors;
}
}
else
{
if (fetestexcept (fe_flag))
{
printf (" Fail: Exception \"%s\" is set\n", flag_name);
++count_errors;
}
else
{
printf (" Pass: Exception \"%s\" is not set\n", flag_name);
}
}
}
#endif
static void
test_exceptions (const char *test_name, short int exception,
int ignore_inexact)
{
printf ("Test: %s\n", test_name);
#ifdef FE_DIVBYZERO
test_single_exception (exception, DIVBYZERO_EXC, FE_DIVBYZERO,
"DIVBYZERO");
#endif
#ifdef FE_INVALID
test_single_exception (exception, INVALID_EXC, FE_INVALID,
"INVALID");
#endif
#ifdef FE_INEXACT
if (!ignore_inexact)
test_single_exception (exception, INEXACT_EXC, FE_INEXACT,
"INEXACT");
#endif
#ifdef FE_UNDERFLOW
test_single_exception (exception, UNDERFLOW_EXC, FE_UNDERFLOW,
"UNDERFLOW");
#endif
#ifdef FE_OVERFLOW
test_single_exception (exception, OVERFLOW_EXC, FE_OVERFLOW,
"OVERFLOW");
#endif
}
static void
print_rounding (int rounding)
{
switch (rounding)
{
#ifdef FE_TONEAREST
case FE_TONEAREST:
printf ("TONEAREST");
break;
#endif
#ifdef FE_UPWARD
case FE_UPWARD:
printf ("UPWARD");
break;
#endif
#ifdef FE_DOWNWARD
case FE_DOWNWARD:
printf ("DOWNWARD");
break;
#endif
#ifdef FE_TOWARDZERO
case FE_TOWARDZERO:
printf ("TOWARDZERO");
break;
#endif
}
printf (".\n");
}
static void
test_rounding (const char *test_name, int rounding_mode)
{
int curr_rounding = fegetround ();
printf ("Test: %s\n", test_name);
if (curr_rounding == rounding_mode)
{
printf (" Pass: Rounding mode is ");
print_rounding (curr_rounding);
}
else
{
++count_errors;
printf (" Fail: Rounding mode is ");
print_rounding (curr_rounding);
}
}
#if FE_ALL_EXCEPT
static void
set_single_exc (const char *test_name, int fe_exc, fexcept_t exception)
{
char str[200];
/* The standard allows the inexact exception to be set together with the
underflow and overflow exceptions. So ignore the inexact flag if the
others are raised. */
int ignore_inexact = (fe_exc & (UNDERFLOW_EXC | OVERFLOW_EXC)) != 0;
strcpy (str, test_name);
strcat (str, ": set flag, with rest not set");
feclearexcept (FE_ALL_EXCEPT);
feraiseexcept (exception);
test_exceptions (str, fe_exc, ignore_inexact);
strcpy (str, test_name);
strcat (str, ": clear flag, rest also unset");
feclearexcept (exception);
test_exceptions (str, NO_EXC, ignore_inexact);
strcpy (str, test_name);
strcat (str, ": set flag, with rest set");
feraiseexcept (FE_ALL_EXCEPT ^ exception);
feraiseexcept (exception);
test_exceptions (str, ALL_EXC, 0);
strcpy (str, test_name);
strcat (str, ": clear flag, leave rest set");
feclearexcept (exception);
test_exceptions (str, ALL_EXC ^ fe_exc, 0);
}
#endif
static void
fe_tests (void)
{
/* clear all exceptions and test if all are cleared */
feclearexcept (FE_ALL_EXCEPT);
test_exceptions ("feclearexcept (FE_ALL_EXCEPT) clears all exceptions",
NO_EXC, 0);
/* Skip further tests here if exceptions not supported. */
if (!EXCEPTION_TESTS (float) && FE_ALL_EXCEPT != 0)
return;
/* raise all exceptions and test if all are raised */
feraiseexcept (FE_ALL_EXCEPT);
test_exceptions ("feraiseexcept (FE_ALL_EXCEPT) raises all exceptions",
ALL_EXC, 0);
feclearexcept (FE_ALL_EXCEPT);
#ifdef FE_DIVBYZERO
set_single_exc ("Set/Clear FE_DIVBYZERO", DIVBYZERO_EXC, FE_DIVBYZERO);
#endif
#ifdef FE_INVALID
set_single_exc ("Set/Clear FE_INVALID", INVALID_EXC, FE_INVALID);
#endif
#ifdef FE_INEXACT
set_single_exc ("Set/Clear FE_INEXACT", INEXACT_EXC, FE_INEXACT);
#endif
#ifdef FE_UNDERFLOW
set_single_exc ("Set/Clear FE_UNDERFLOW", UNDERFLOW_EXC, FE_UNDERFLOW);
#endif
#ifdef FE_OVERFLOW
set_single_exc ("Set/Clear FE_OVERFLOW", OVERFLOW_EXC, FE_OVERFLOW);
#endif
}
#if FE_ALL_EXCEPT
/* Test that program aborts with no masked interrupts */
static void
feenv_nomask_test (const char *flag_name, int fe_exc)
{
# if defined FE_NOMASK_ENV
int status;
pid_t pid;
if (!EXCEPTION_ENABLE_SUPPORTED (FE_ALL_EXCEPT)
&& fesetenv (FE_NOMASK_ENV) != 0)
{
printf ("Test: not testing FE_NOMASK_ENV, it isn't implemented.\n");
return;
}
printf ("Test: after fesetenv (FE_NOMASK_ENV) processes will abort\n");
printf (" when feraiseexcept (%s) is called.\n", flag_name);
pid = fork ();
if (pid == 0)
{
# ifdef RLIMIT_CORE
/* Try to avoid dumping core. */
struct rlimit core_limit;
core_limit.rlim_cur = 0;
core_limit.rlim_max = 0;
setrlimit (RLIMIT_CORE, &core_limit);
# endif
fesetenv (FE_NOMASK_ENV);
feraiseexcept (fe_exc);
exit (2);
}
else if (pid < 0)
{
if (errno != ENOSYS)
{
printf (" Fail: Could not fork.\n");
++count_errors;
}
else
printf (" `fork' not implemented, test ignored.\n");
}
else {
if (waitpid (pid, &status, 0) != pid)
{
printf (" Fail: waitpid call failed.\n");
++count_errors;
}
else if (WIFSIGNALED (status) && WTERMSIG (status) == SIGFPE)
printf (" Pass: Process received SIGFPE.\n");
else
{
printf (" Fail: Process didn't receive signal and exited with status %d.\n",
status);
++count_errors;
}
}
# endif
}
/* Test that program doesn't abort with default environment */
static void
feenv_mask_test (const char *flag_name, int fe_exc)
{
int status;
pid_t pid;
printf ("Test: after fesetenv (FE_DFL_ENV) processes will not abort\n");
printf (" when feraiseexcept (%s) is called.\n", flag_name);
pid = fork ();
if (pid == 0)
{
#ifdef RLIMIT_CORE
/* Try to avoid dumping core. */
struct rlimit core_limit;
core_limit.rlim_cur = 0;
core_limit.rlim_max = 0;
setrlimit (RLIMIT_CORE, &core_limit);
#endif
fesetenv (FE_DFL_ENV);
feraiseexcept (fe_exc);
exit (2);
}
else if (pid < 0)
{
if (errno != ENOSYS)
{
printf (" Fail: Could not fork.\n");
++count_errors;
}
else
printf (" `fork' not implemented, test ignored.\n");
}
else {
if (waitpid (pid, &status, 0) != pid)
{
printf (" Fail: waitpid call failed.\n");
++count_errors;
}
else if (WIFEXITED (status) && WEXITSTATUS (status) == 2)
printf (" Pass: Process exited normally.\n");
else
{
printf (" Fail: Process exited abnormally with status %d.\n",
status);
++count_errors;
}
}
}
/* Test that program aborts with no masked interrupts */
static void
feexcp_nomask_test (const char *flag_name, int fe_exc)
{
int status;
pid_t pid;
if (!EXCEPTION_ENABLE_SUPPORTED (fe_exc) && feenableexcept (fe_exc) == -1)
{
printf ("Test: not testing feenableexcept, it isn't implemented.\n");
return;
}
printf ("Test: after feenableexcept (%s) processes will abort\n",
flag_name);
printf (" when feraiseexcept (%s) is called.\n", flag_name);
pid = fork ();
if (pid == 0)
{
#ifdef RLIMIT_CORE
/* Try to avoid dumping core. */
struct rlimit core_limit;
core_limit.rlim_cur = 0;
core_limit.rlim_max = 0;
setrlimit (RLIMIT_CORE, &core_limit);
#endif
fedisableexcept (FE_ALL_EXCEPT);
feenableexcept (fe_exc);
feraiseexcept (fe_exc);
exit (2);
}
else if (pid < 0)
{
if (errno != ENOSYS)
{
printf (" Fail: Could not fork.\n");
++count_errors;
}
else
printf (" `fork' not implemented, test ignored.\n");
}
else {
if (waitpid (pid, &status, 0) != pid)
{
printf (" Fail: waitpid call failed.\n");
++count_errors;
}
else if (WIFSIGNALED (status) && WTERMSIG (status) == SIGFPE)
printf (" Pass: Process received SIGFPE.\n");
else
{
printf (" Fail: Process didn't receive signal and exited with status %d.\n",
status);
++count_errors;
}
}
}
/* Test that program doesn't abort with exception. */
static void
feexcp_mask_test (const char *flag_name, int fe_exc)
{
int status;
int exception;
pid_t pid;
printf ("Test: after fedisableexcept (%s) processes will not abort\n",
flag_name);
printf (" when feraiseexcept (%s) is called.\n", flag_name);
pid = fork ();
if (pid == 0)
{
#ifdef RLIMIT_CORE
/* Try to avoid dumping core. */
struct rlimit core_limit;
core_limit.rlim_cur = 0;
core_limit.rlim_max = 0;
setrlimit (RLIMIT_CORE, &core_limit);
#endif
feenableexcept (FE_ALL_EXCEPT);
exception = fe_exc;
#ifdef FE_INEXACT
/* The standard allows the inexact exception to be set together with the
underflow and overflow exceptions. So add FE_INEXACT to the set of
exceptions to be disabled if we will be raising underflow or
overflow. */
# ifdef FE_OVERFLOW
if (fe_exc & FE_OVERFLOW)
exception |= FE_INEXACT;
# endif
# ifdef FE_UNDERFLOW
if (fe_exc & FE_UNDERFLOW)
exception |= FE_INEXACT;
# endif
#endif
fedisableexcept (exception);
feraiseexcept (fe_exc);
exit (2);
}
else if (pid < 0)
{
if (errno != ENOSYS)
{
printf (" Fail: Could not fork.\n");
++count_errors;
}
else
printf (" `fork' not implemented, test ignored.\n");
}
else {
if (waitpid (pid, &status, 0) != pid)
{
printf (" Fail: waitpid call failed.\n");
++count_errors;
}
else if (WIFEXITED (status) && WEXITSTATUS (status) == 2)
printf (" Pass: Process exited normally.\n");
else
{
printf (" Fail: Process exited abnormally with status %d.\n",
status);
++count_errors;
}
}
}
/* Tests for feenableexcept/fedisableexcept/fegetexcept. */
static void
feenable_test (const char *flag_name, int fe_exc)
{
int excepts;
printf ("Tests for feenableexcepts etc. with flag %s\n", flag_name);
/* First disable all exceptions. */
if (fedisableexcept (FE_ALL_EXCEPT) == -1)
{
printf ("Test: fedisableexcept (FE_ALL_EXCEPT) failed\n");
++count_errors;
/* If this fails, the other tests don't make sense. */
return;
}
excepts = fegetexcept ();
if (excepts != 0)
{
printf ("Test: fegetexcept (%s) failed, return should be 0, is %d\n",
flag_name, excepts);
++count_errors;
}
excepts = feenableexcept (fe_exc);
if (!EXCEPTION_ENABLE_SUPPORTED (fe_exc) && excepts == -1)
{
printf ("Test: not testing feenableexcept, it isn't implemented.\n");
return;
}
if (excepts == -1)
{
printf ("Test: feenableexcept (%s) failed\n", flag_name);
++count_errors;
return;
}
if (excepts != 0)
{
printf ("Test: feenableexcept (%s) failed, return should be 0, is %x\n",
flag_name, excepts);
++count_errors;
}
excepts = fegetexcept ();
if (excepts != fe_exc)
{
printf ("Test: fegetexcept (%s) failed, return should be 0x%x, is 0x%x\n",
flag_name, fe_exc, excepts);
++count_errors;
}
/* And now disable the exception again. */
excepts = fedisableexcept (fe_exc);
if (excepts == -1)
{
printf ("Test: fedisableexcept (%s) failed\n", flag_name);
++count_errors;
return;
}
if (excepts != fe_exc)
{
printf ("Test: fedisableexcept (%s) failed, return should be 0x%x, is 0x%x\n",
flag_name, fe_exc, excepts);
++count_errors;
}
excepts = fegetexcept ();
if (excepts != 0)
{
printf ("Test: fegetexcept (%s) failed, return should be 0, is 0x%x\n",
flag_name, excepts);
++count_errors;
}
/* Now the other way round: Enable all exceptions and disable just this one. */
if (feenableexcept (FE_ALL_EXCEPT) == -1)
{
printf ("Test: feenableexcept (FE_ALL_EXCEPT) failed\n");
++count_errors;
/* If this fails, the other tests don't make sense. */
return;
}
excepts = fegetexcept ();
if (excepts != FE_ALL_EXCEPT)
{
printf ("Test: fegetexcept (%s) failed, return should be 0x%x, is 0x%x\n",
flag_name, FE_ALL_EXCEPT, excepts);
++count_errors;
}
excepts = fedisableexcept (fe_exc);
if (excepts == -1)
{
printf ("Test: fedisableexcept (%s) failed\n", flag_name);
++count_errors;
return;
}
if (excepts != FE_ALL_EXCEPT)
{
printf ("Test: fedisableexcept (%s) failed, return should be 0, is 0x%x\n",
flag_name, excepts);
++count_errors;
}
excepts = fegetexcept ();
if (excepts != (FE_ALL_EXCEPT & ~fe_exc))
{
printf ("Test: fegetexcept (%s) failed, return should be 0x%x, is 0x%x\n",
flag_name, (FE_ALL_EXCEPT & ~fe_exc), excepts);
++count_errors;
}
/* And now enable the exception again. */
excepts = feenableexcept (fe_exc);
if (excepts == -1)
{
printf ("Test: feenableexcept (%s) failed\n", flag_name);
++count_errors;
return;
}
if (excepts != (FE_ALL_EXCEPT & ~fe_exc))
{
printf ("Test: feenableexcept (%s) failed, return should be 0, is 0x%x\n",
flag_name, excepts);
++count_errors;
}
excepts = fegetexcept ();
if (excepts != FE_ALL_EXCEPT)
{
printf ("Test: fegetexcept (%s) failed, return should be 0x%x, is 0x%x\n",
flag_name, FE_ALL_EXCEPT, excepts);
++count_errors;
}
feexcp_nomask_test (flag_name, fe_exc);
feexcp_mask_test (flag_name, fe_exc);
}
static void
fe_single_test (const char *flag_name, int fe_exc)
{
feenv_nomask_test (flag_name, fe_exc);
feenv_mask_test (flag_name, fe_exc);
feenable_test (flag_name, fe_exc);
}
#endif
static void
feenv_tests (void)
{
/* We might have some exceptions still set. */
feclearexcept (FE_ALL_EXCEPT);
#ifdef FE_DIVBYZERO
fe_single_test ("FE_DIVBYZERO", FE_DIVBYZERO);
#endif
#ifdef FE_INVALID
fe_single_test ("FE_INVALID", FE_INVALID);
#endif
#ifdef FE_INEXACT
fe_single_test ("FE_INEXACT", FE_INEXACT);
#endif
#ifdef FE_UNDERFLOW
fe_single_test ("FE_UNDERFLOW", FE_UNDERFLOW);
#endif
#ifdef FE_OVERFLOW
fe_single_test ("FE_OVERFLOW", FE_OVERFLOW);
#endif
fesetenv (FE_DFL_ENV);
}
static void
feholdexcept_tests (void)
{
fenv_t saved, saved2;
int res;
feclearexcept (FE_ALL_EXCEPT);
fedisableexcept (FE_ALL_EXCEPT);
#ifdef FE_DIVBYZERO
feraiseexcept (FE_DIVBYZERO);
#endif
if (EXCEPTION_TESTS (float))
test_exceptions ("feholdexcept_tests FE_DIVBYZERO test",
DIVBYZERO_EXC, 0);
res = feholdexcept (&saved);
if (res != 0)
{
printf ("feholdexcept failed: %d\n", res);
++count_errors;
}
#if defined FE_TONEAREST && defined FE_TOWARDZERO
res = fesetround (FE_TOWARDZERO);
if (res != 0 && ROUNDING_TESTS (float, FE_TOWARDZERO))
{
printf ("fesetround failed: %d\n", res);
++count_errors;
}
#endif
test_exceptions ("feholdexcept_tests 0 test", NO_EXC, 0);
#ifdef FE_INVALID
feraiseexcept (FE_INVALID);
if (EXCEPTION_TESTS (float))
test_exceptions ("feholdexcept_tests FE_INVALID test",
INVALID_EXC, 0);
#endif
res = feupdateenv (&saved);
if (res != 0)
{
printf ("feupdateenv failed: %d\n", res);
++count_errors;
}
#if defined FE_TONEAREST && defined FE_TOWARDZERO
res = fegetround ();
if (res != FE_TONEAREST)
{
printf ("feupdateenv didn't restore rounding mode: %d\n", res);
++count_errors;
}
#endif
if (EXCEPTION_TESTS (float))
test_exceptions ("feholdexcept_tests FE_DIVBYZERO|FE_INVALID test",
DIVBYZERO_EXC | INVALID_EXC, 0);
feclearexcept (FE_ALL_EXCEPT);
#ifdef FE_INVALID
feraiseexcept (FE_INVALID);
#endif
#if defined FE_TONEAREST && defined FE_UPWARD
res = fesetround (FE_UPWARD);
if (res != 0 && ROUNDING_TESTS (float, FE_UPWARD))
{
printf ("fesetround failed: %d\n", res);
++count_errors;
}
#endif
res = feholdexcept (&saved2);
if (res != 0)
{
printf ("feholdexcept failed: %d\n", res);
++count_errors;
}
#if defined FE_TONEAREST && defined FE_UPWARD
res = fesetround (FE_TONEAREST);
if (res != 0)
{
printf ("fesetround failed: %d\n", res);
++count_errors;
}
#endif
test_exceptions ("feholdexcept_tests 0 2nd test", NO_EXC, 0);
#ifdef FE_INEXACT
feraiseexcept (FE_INEXACT);
if (EXCEPTION_TESTS (float))
test_exceptions ("feholdexcept_tests FE_INEXACT test",
INEXACT_EXC, 0);
#endif
res = feupdateenv (&saved2);
if (res != 0)
{
printf ("feupdateenv failed: %d\n", res);
++count_errors;
}
#if defined FE_TONEAREST && defined FE_UPWARD
res = fegetround ();
if (res != FE_UPWARD && ROUNDING_TESTS (float, FE_UPWARD))
{
printf ("feupdateenv didn't restore rounding mode: %d\n", res);
++count_errors;
}
fesetround (FE_TONEAREST);
#endif
if (EXCEPTION_TESTS (float))
test_exceptions ("feholdexcept_tests FE_INEXACT|FE_INVALID test",
INVALID_EXC | INEXACT_EXC, 0);
feclearexcept (FE_ALL_EXCEPT);
}
/* IEC 559 and ISO C99 define a default startup environment */
static void
initial_tests (void)
{
test_exceptions ("Initially all exceptions should be cleared",
NO_EXC, 0);
#ifdef FE_TONEAREST
test_rounding ("Rounding direction should be initalized to nearest",
FE_TONEAREST);
#endif
}
int
main (void)
{
initial_tests ();
fe_tests ();
feenv_tests ();
feholdexcept_tests ();
if (count_errors)
{
printf ("\n%d errors occurred.\n", count_errors);
exit (1);
}
printf ("\n All tests passed successfully.\n");
return 0;
}
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