mirror of git://sourceware.org/git/glibc.git
97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
/* Test fesetexcept: exception traps enabled.
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Copyright (C) 2016-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <fenv.h>
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#include <stdio.h>
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#include <math-tests.h>
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#include <math-barriers.h>
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static int
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do_test (void)
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{
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int result = 0;
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fedisableexcept (FE_ALL_EXCEPT);
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int ret = feenableexcept (FE_ALL_EXCEPT);
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if (!EXCEPTION_ENABLE_SUPPORTED (FE_ALL_EXCEPT) && (ret == -1))
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{
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puts ("feenableexcept (FE_ALL_EXCEPT) not supported, cannot test");
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return 77;
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}
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else if (ret != 0)
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{
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puts ("feenableexcept (FE_ALL_EXCEPT) failed");
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result = 1;
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return result;
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}
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/* Verify fesetexcept does not cause exception traps. For architectures
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where setting the exception might result in traps the function should
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return a nonzero value.
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Also check if the function does not alter the exception mask. */
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ret = fesetexcept (FE_ALL_EXCEPT);
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_Static_assert (!(EXCEPTION_SET_FORCES_TRAP && !EXCEPTION_TESTS(float)),
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"EXCEPTION_SET_FORCES_TRAP only makes sense if the "
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"architecture suports exceptions");
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{
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int exc_before = fegetexcept ();
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ret = fesetexcept (FE_ALL_EXCEPT);
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int exc_after = fegetexcept ();
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if (exc_before != exc_after)
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{
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puts ("fesetexcept (FE_ALL_EXCEPT) changed the exceptions mask");
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return 1;
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}
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}
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/* Execute some floating-point operations, since on some CPUs exceptions
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triggers a trap only at the next floating-point instruction. */
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volatile double a = 1.0;
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volatile double b = a + a;
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math_force_eval (b);
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volatile long double al = 1.0L;
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volatile long double bl = al + al;
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math_force_eval (bl);
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if (ret == 0)
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{
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if (EXCEPTION_SET_FORCES_TRAP)
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{
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puts ("unexpected fesetexcept success");
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result = 1;
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}
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}
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else if (!EXCEPTION_SET_FORCES_TRAP)
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{
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puts ("fesetexcept (FE_ALL_EXCEPT) failed");
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if (EXCEPTION_TESTS (float))
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{
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puts ("failure of fesetexcept was unexpected");
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result = 1;
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}
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else
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puts ("failure of fesetexcept OK");
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}
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feclearexcept (FE_ALL_EXCEPT);
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return result;
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}
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#include <support/test-driver.c>
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