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688903eb3e
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
/* Clear floating-point exceptions for atomic compound assignment.
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e500 version.
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Copyright (C) 2004-2018 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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<http://www.gnu.org/licenses/>. */
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#include <fenv_libc.h>
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#include <stdlib.h>
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#include <sysdep.h>
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#include <sys/prctl.h>
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void
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__atomic_feclearexcept (void)
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{
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unsigned int fpescr, old_fpescr;
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/* Get the current state. */
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old_fpescr = fpescr = fegetenv_register ();
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/* Clear the relevant bits. */
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fpescr &= ~SPEFSCR_ALL_EXCEPT;
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/* Put the new state in effect. */
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fesetenv_register (fpescr);
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/* Let the kernel know if the "invalid" or "underflow" bit was
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cleared. */
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if (old_fpescr & (SPEFSCR_FINVS | SPEFSCR_FUNFS))
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{
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int pflags __attribute__ ((__unused__)), r;
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INTERNAL_SYSCALL_DECL (err);
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r = INTERNAL_SYSCALL (prctl, err, 2, PR_GET_FPEXC, &pflags);
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if (INTERNAL_SYSCALL_ERROR_P (r, err))
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abort ();
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}
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}
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