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maint: run 'make update-copyright'
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/* Test of tracking of floating-point exceptions.
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 <fenv.h>
#include "macros.h"
/* On *BSD/powerpc systems, raising FE_INVALID also sets FE_VXSOFT. */
#ifndef FE_VXSOFT
# define FE_VXSOFT 0
#endif
#ifndef FE_VXZDZ
# define FE_VXZDZ 0
#endif
static volatile double a, b, c;
int
main ()
{
/* Test setting all exception flags. */
if (feraiseexcept (FE_ALL_EXCEPT) != 0)
{
fputs ("Skipping test: floating-point exceptions are not supported on this machine.\n", stderr);
return 77;
}
ASSERT (/* with the libc's feraiseexcept(): */
fetestexcept (FE_ALL_EXCEPT) == FE_ALL_EXCEPT
|| /* with gnulib's feraiseexcept(): */
(fetestexcept (FE_ALL_EXCEPT) & ~FE_VXSOFT)
== (FE_DIVBYZERO | FE_INEXACT | FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW));
ASSERT (fetestexcept (FE_INVALID) == FE_INVALID);
ASSERT (fetestexcept (FE_DIVBYZERO) == FE_DIVBYZERO);
ASSERT (fetestexcept (FE_OVERFLOW) == FE_OVERFLOW);
ASSERT (fetestexcept (FE_UNDERFLOW) == FE_UNDERFLOW);
ASSERT (fetestexcept (FE_INEXACT) == FE_INEXACT);
/* Test clearing all exception flags. */
ASSERT (feclearexcept (FE_ALL_EXCEPT) == 0);
ASSERT (fetestexcept (FE_ALL_EXCEPT) == 0);
ASSERT (fetestexcept (FE_INVALID) == 0);
ASSERT (fetestexcept (FE_DIVBYZERO) == 0);
ASSERT (fetestexcept (FE_OVERFLOW) == 0);
ASSERT (fetestexcept (FE_UNDERFLOW) == 0);
ASSERT (fetestexcept (FE_INEXACT) == 0);
/* Test setting just one exception flag: FE_INVALID. */
ASSERT (feclearexcept (FE_ALL_EXCEPT) == 0);
ASSERT (feraiseexcept (FE_INVALID) == 0);
ASSERT ((fetestexcept (FE_ALL_EXCEPT) & ~FE_VXSOFT) == FE_INVALID);
ASSERT (fetestexcept (FE_INVALID) == FE_INVALID);
ASSERT (fetestexcept (FE_DIVBYZERO) == 0);
ASSERT (fetestexcept (FE_OVERFLOW) == 0);
ASSERT (fetestexcept (FE_UNDERFLOW) == 0);
ASSERT (fetestexcept (FE_INEXACT) == 0);
/* Test setting just one exception flag: FE_DIVBYZERO. */
ASSERT (feclearexcept (FE_ALL_EXCEPT) == 0);
ASSERT (feraiseexcept (FE_DIVBYZERO) == 0);
ASSERT (fetestexcept (FE_ALL_EXCEPT) == FE_DIVBYZERO);
ASSERT (fetestexcept (FE_INVALID) == 0);
ASSERT (fetestexcept (FE_DIVBYZERO) == FE_DIVBYZERO);
ASSERT (fetestexcept (FE_OVERFLOW) == 0);
ASSERT (fetestexcept (FE_UNDERFLOW) == 0);
ASSERT (fetestexcept (FE_INEXACT) == 0);
/* Test setting just one exception flag: FE_OVERFLOW.
On many architectures, this has the side-effect of also setting FE_INEXACT:
arm64, arm, alpha, hppa, ia64, loongarch64, s390, sh, sparc. */
ASSERT (feclearexcept (FE_ALL_EXCEPT) == 0);
ASSERT (feraiseexcept (FE_OVERFLOW) == 0);
ASSERT ((fetestexcept (FE_ALL_EXCEPT) & ~FE_INEXACT) == FE_OVERFLOW);
ASSERT (fetestexcept (FE_INVALID) == 0);
ASSERT (fetestexcept (FE_DIVBYZERO) == 0);
ASSERT (fetestexcept (FE_OVERFLOW) == FE_OVERFLOW);
ASSERT (fetestexcept (FE_UNDERFLOW) == 0);
/* Test setting just one exception flag: FE_UNDERFLOW.
On many architectures, this has the side-effect of also setting FE_INEXACT:
arm64, arm, alpha, hppa, ia64, loongarch64, s390, sh, sparc. */
ASSERT (feclearexcept (FE_ALL_EXCEPT) == 0);
ASSERT (feraiseexcept (FE_UNDERFLOW) == 0);
ASSERT ((fetestexcept (FE_ALL_EXCEPT) & ~FE_INEXACT) == FE_UNDERFLOW);
ASSERT (fetestexcept (FE_INVALID) == 0);
ASSERT (fetestexcept (FE_DIVBYZERO) == 0);
ASSERT (fetestexcept (FE_OVERFLOW) == 0);
ASSERT (fetestexcept (FE_UNDERFLOW) == FE_UNDERFLOW);
/* Test setting just one exception flag: FE_INEXACT. */
ASSERT (feclearexcept (FE_ALL_EXCEPT) == 0);
ASSERT (feraiseexcept (FE_INEXACT) == 0);
ASSERT (fetestexcept (FE_ALL_EXCEPT) == FE_INEXACT);
ASSERT (fetestexcept (FE_INVALID) == 0);
ASSERT (fetestexcept (FE_DIVBYZERO) == 0);
ASSERT (fetestexcept (FE_OVERFLOW) == 0);
ASSERT (fetestexcept (FE_UNDERFLOW) == 0);
ASSERT (fetestexcept (FE_INEXACT) == FE_INEXACT);
/* Test clearing just one exception flag: FE_INVALID. */
ASSERT (feraiseexcept (FE_ALL_EXCEPT) == 0);
ASSERT (feclearexcept (FE_INVALID) == 0);
ASSERT (/* with the libc's feraiseexcept(): */
fetestexcept (FE_ALL_EXCEPT) == (FE_ALL_EXCEPT & ~FE_INVALID)
|| /* with gnulib's feraiseexcept(): */
fetestexcept (FE_ALL_EXCEPT)
== (FE_DIVBYZERO | FE_INEXACT | FE_OVERFLOW | FE_UNDERFLOW));
ASSERT (fetestexcept (FE_INVALID) == 0);
ASSERT (fetestexcept (FE_DIVBYZERO) == FE_DIVBYZERO);
ASSERT (fetestexcept (FE_OVERFLOW) == FE_OVERFLOW);
ASSERT (fetestexcept (FE_UNDERFLOW) == FE_UNDERFLOW);
ASSERT (fetestexcept (FE_INEXACT) == FE_INEXACT);
/* Test clearing just one exception flag: FE_DIVBYZERO. */
ASSERT (feraiseexcept (FE_ALL_EXCEPT) == 0);
ASSERT (feclearexcept (FE_DIVBYZERO) == 0);
ASSERT (/* with the libc's feraiseexcept(): */
fetestexcept (FE_ALL_EXCEPT) == (FE_ALL_EXCEPT & ~FE_DIVBYZERO)
|| /* with gnulib's feraiseexcept(): */
(fetestexcept (FE_ALL_EXCEPT) & ~FE_VXSOFT)
== (FE_INEXACT | FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW));
ASSERT (fetestexcept (FE_INVALID) == FE_INVALID);
ASSERT (fetestexcept (FE_DIVBYZERO) == 0);
ASSERT (fetestexcept (FE_OVERFLOW) == FE_OVERFLOW);
ASSERT (fetestexcept (FE_UNDERFLOW) == FE_UNDERFLOW);
ASSERT (fetestexcept (FE_INEXACT) == FE_INEXACT);
/* Test clearing just one exception flag: FE_OVERFLOW. */
ASSERT (feraiseexcept (FE_ALL_EXCEPT) == 0);
ASSERT (feclearexcept (FE_OVERFLOW) == 0);
ASSERT (/* with the libc's feraiseexcept(): */
fetestexcept (FE_ALL_EXCEPT) == (FE_ALL_EXCEPT & ~FE_OVERFLOW)
|| /* with gnulib's feraiseexcept(): */
(fetestexcept (FE_ALL_EXCEPT) & ~FE_VXSOFT)
== (FE_DIVBYZERO | FE_INEXACT | FE_INVALID | FE_UNDERFLOW));
ASSERT (fetestexcept (FE_INVALID) == FE_INVALID);
ASSERT (fetestexcept (FE_DIVBYZERO) == FE_DIVBYZERO);
ASSERT (fetestexcept (FE_OVERFLOW) == 0);
ASSERT (fetestexcept (FE_UNDERFLOW) == FE_UNDERFLOW);
ASSERT (fetestexcept (FE_INEXACT) == FE_INEXACT);
/* Test clearing just one exception flag: FE_UNDERFLOW. */
ASSERT (feraiseexcept (FE_ALL_EXCEPT) == 0);
ASSERT (feclearexcept (FE_UNDERFLOW) == 0);
ASSERT (/* with the libc's feraiseexcept(): */
fetestexcept (FE_ALL_EXCEPT) == (FE_ALL_EXCEPT & ~FE_UNDERFLOW)
|| /* with gnulib's feraiseexcept(): */
(fetestexcept (FE_ALL_EXCEPT) & ~FE_VXSOFT)
== (FE_DIVBYZERO | FE_INEXACT | FE_INVALID | FE_OVERFLOW));
ASSERT (fetestexcept (FE_INVALID) == FE_INVALID);
ASSERT (fetestexcept (FE_DIVBYZERO) == FE_DIVBYZERO);
ASSERT (fetestexcept (FE_OVERFLOW) == FE_OVERFLOW);
ASSERT (fetestexcept (FE_UNDERFLOW) == 0);
ASSERT (fetestexcept (FE_INEXACT) == FE_INEXACT);
/* Test clearing just one exception flag: FE_INEXACT. */
ASSERT (feraiseexcept (FE_ALL_EXCEPT) == 0);
ASSERT (feclearexcept (FE_INEXACT) == 0);
ASSERT (/* with the libc's feraiseexcept(): */
fetestexcept (FE_ALL_EXCEPT) == (FE_ALL_EXCEPT & ~FE_INEXACT)
|| /* with gnulib's feraiseexcept(): */
(fetestexcept (FE_ALL_EXCEPT) & ~FE_VXSOFT)
== (FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW));
ASSERT (fetestexcept (FE_INVALID) == FE_INVALID);
ASSERT (fetestexcept (FE_DIVBYZERO) == FE_DIVBYZERO);
ASSERT (fetestexcept (FE_OVERFLOW) == FE_OVERFLOW);
ASSERT (fetestexcept (FE_UNDERFLOW) == FE_UNDERFLOW);
ASSERT (fetestexcept (FE_INEXACT) == 0);
#if !(defined __arm__ && defined __SOFTFP__)
/* Test the effects of an operation that produces FE_INVALID. */
ASSERT (feclearexcept (FE_ALL_EXCEPT) == 0);
a = 0; b = 0; c = a / b;
ASSERT ((fetestexcept (FE_ALL_EXCEPT) & ~FE_VXZDZ) == FE_INVALID);
ASSERT (fetestexcept (FE_INVALID) == FE_INVALID);
ASSERT (fetestexcept (FE_DIVBYZERO) == 0);
ASSERT (fetestexcept (FE_OVERFLOW) == 0);
ASSERT (fetestexcept (FE_UNDERFLOW) == 0);
ASSERT (fetestexcept (FE_INEXACT) == 0);
/* Test the effects of an operation that produces FE_DIVBYZERO. */
ASSERT (feclearexcept (FE_ALL_EXCEPT) == 0);
a = 3; b = 0; c = a / b;
ASSERT (fetestexcept (FE_ALL_EXCEPT) == FE_DIVBYZERO);
ASSERT (fetestexcept (FE_INVALID) == 0);
ASSERT (fetestexcept (FE_DIVBYZERO) == FE_DIVBYZERO);
ASSERT (fetestexcept (FE_OVERFLOW) == 0);
ASSERT (fetestexcept (FE_UNDERFLOW) == 0);
ASSERT (fetestexcept (FE_INEXACT) == 0);
/* Test the effects of an operation that produces FE_OVERFLOW. */
ASSERT (feclearexcept (FE_ALL_EXCEPT) == 0);
a = 1; for (int i = 0; i < 800; i++) a = 2.0 * a;
b = 1; for (int i = 0; i < 700; i++) b = 2.0 * b;
c = a * b;
{
int exc = fetestexcept (FE_ALL_EXCEPT);
ASSERT ((FE_OVERFLOW & ~exc) == 0);
ASSERT ((exc & ~(FE_OVERFLOW | FE_INEXACT)) == 0);
}
ASSERT (fetestexcept (FE_INVALID) == 0);
ASSERT (fetestexcept (FE_DIVBYZERO) == 0);
ASSERT (fetestexcept (FE_OVERFLOW) == FE_OVERFLOW);
ASSERT (fetestexcept (FE_UNDERFLOW) == 0);
/* Test the effects of an operation that produces FE_UNDERFLOW. */
ASSERT (feclearexcept (FE_ALL_EXCEPT) == 0);
a = 1; for (int i = 0; i < 800; i++) a = 0.5 * a;
b = 1; for (int i = 0; i < 700; i++) b = 0.5 * b;
c = a * b;
{
int exc = fetestexcept (FE_ALL_EXCEPT);
ASSERT ((FE_UNDERFLOW & ~exc) == 0);
ASSERT ((exc & ~(FE_UNDERFLOW | FE_INEXACT)) == 0);
}
ASSERT (fetestexcept (FE_INVALID) == 0);
ASSERT (fetestexcept (FE_DIVBYZERO) == 0);
ASSERT (fetestexcept (FE_OVERFLOW) == 0);
ASSERT (fetestexcept (FE_UNDERFLOW) == FE_UNDERFLOW);
/* On alpha, this test works only when compiled with the GCC option
'-mieee-with-inexact'. */
# if !defined __alpha
/* Test the effects of an operation that produces FE_INEXACT. */
ASSERT (feclearexcept (FE_ALL_EXCEPT) == 0);
a = 1; b = 3; c = a / b;
ASSERT (fetestexcept (FE_ALL_EXCEPT) == FE_INEXACT);
ASSERT (fetestexcept (FE_INVALID) == 0);
ASSERT (fetestexcept (FE_DIVBYZERO) == 0);
ASSERT (fetestexcept (FE_OVERFLOW) == 0);
ASSERT (fetestexcept (FE_UNDERFLOW) == 0);
ASSERT (fetestexcept (FE_INEXACT) == FE_INEXACT);
# endif
#endif
return test_exit_status;
}