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/* Test fesetexcept: exception traps enabled.
Copyright (C) 2016-2024 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/>. */
#include <fenv.h>
#include <stdio.h>
#include <math-tests.h>
#include <math-barriers.h>
static int
do_test (void)
{
int result = 0;
fedisableexcept (FE_ALL_EXCEPT);
int ret = feenableexcept (FE_ALL_EXCEPT);
if (!EXCEPTION_ENABLE_SUPPORTED (FE_ALL_EXCEPT) && (ret == -1))
{
puts ("feenableexcept (FE_ALL_EXCEPT) not supported, cannot test");
return 77;
}
else if (ret != 0)
{
puts ("feenableexcept (FE_ALL_EXCEPT) failed");
result = 1;
return result;
}
/* Verify fesetexcept does not cause exception traps. For architectures
where setting the exception might result in traps the function should
return a nonzero value.
Also check if the function does not alter the exception mask. */
ret = fesetexcept (FE_ALL_EXCEPT);
_Static_assert (!(EXCEPTION_SET_FORCES_TRAP && !EXCEPTION_TESTS(float)),
"EXCEPTION_SET_FORCES_TRAP only makes sense if the "
"architecture suports exceptions");
{
int exc_before = fegetexcept ();
ret = fesetexcept (FE_ALL_EXCEPT);
int exc_after = fegetexcept ();
if (exc_before != exc_after)
{
puts ("fesetexcept (FE_ALL_EXCEPT) changed the exceptions mask");
return 1;
}
}
/* Execute some floating-point operations, since on some CPUs exceptions
triggers a trap only at the next floating-point instruction. */
volatile double a = 1.0;
volatile double b = a + a;
math_force_eval (b);
volatile long double al = 1.0L;
volatile long double bl = al + al;
math_force_eval (bl);
if (ret == 0)
{
if (EXCEPTION_SET_FORCES_TRAP)
{
puts ("unexpected fesetexcept success");
result = 1;
}
}
else if (!EXCEPTION_SET_FORCES_TRAP)
{
puts ("fesetexcept (FE_ALL_EXCEPT) failed");
if (EXCEPTION_TESTS (float))
{
puts ("failure of fesetexcept was unexpected");
result = 1;
}
else
puts ("failure of fesetexcept OK");
}
feclearexcept (FE_ALL_EXCEPT);
return result;
}
#include <support/test-driver.c>
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