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96 lines
3.0 KiB
C
96 lines
3.0 KiB
C
/* Test of saving the floating-point exception status flags.
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Copyright (C) 2023-2026 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>, 2023. */
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#include <config.h>
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/* Specification. */
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#include <fenv.h>
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#include <stdio.h>
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#include "fpe-trapping.h"
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#include "macros.h"
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/* musl libc does not support floating-point exception trapping, even where
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the hardware supports it. See
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<https://wiki.musl-libc.org/functional-differences-from-glibc.html> */
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#if HAVE_FPE_TRAPPING && (!MUSL_LIBC || GNULIB_FEENABLEEXCEPT)
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/* Check that fesetexceptflag() does not trigger a trap. */
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static volatile double a, b;
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static volatile long double al, bl;
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int
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main ()
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{
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fexcept_t saved_flags_1;
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/* Test setting all exception flags. */
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if (feraiseexcept (FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT) != 0)
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{
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fputs ("Skipping test: floating-point exceptions are not supported on this machine.\n", stderr);
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return 77;
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}
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/* Fill saved_flags_1. */
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ASSERT (fegetexceptflag (&saved_flags_1,
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FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT)
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== 0);
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/* Clear exceptions from past operations. */
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feclearexcept (FE_ALL_EXCEPT);
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/* An FE_INVALID exception shall trigger a SIGFPE signal, which by default
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terminates the program. */
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if (sigfpe_on_invalid () < 0)
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{
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if (test_exit_status != EXIT_SUCCESS)
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return test_exit_status;
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fputs ("Skipping test: trapping floating-point exceptions are not supported on this machine.\n", stderr);
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return 77;
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}
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/* Attempt to set the FE_INVALID exception flag. */
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_GL_UNUSED int rc = fesetexceptflag (&saved_flags_1, FE_INVALID);
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/* On older i386 and on PowerPC, there is no way to implement
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fesetexceptflag() such that it does not trigger a trap. fesetexceptflag()
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is expected to fail in this case. */
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# if !((defined __i386 || defined _M_IX86) || defined _ARCH_PPC)
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ASSERT (rc == 0);
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# endif
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/* Do a harmless floating-point operation (since on some CPUs, floating-point
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exceptions trigger a trap only at the next floating-point operation). */
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a = 1.0; b = a + a;
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al = 1.0L; bl = al + al;
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return test_exit_status;
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}
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#else
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int
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main ()
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{
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fputs ("Skipping test: feenableexcept not available\n", stderr);
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return 77;
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}
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#endif
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