mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-26 12:41:05 +00:00
51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
/* Clear floating-point exceptions for atomic compound assignment.
|
|
e500 version.
|
|
Copyright (C) 2004-2017 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
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <fenv_libc.h>
|
|
#include <stdlib.h>
|
|
#include <sysdep.h>
|
|
#include <sys/prctl.h>
|
|
|
|
void
|
|
__atomic_feclearexcept (void)
|
|
{
|
|
unsigned int fpescr, old_fpescr;
|
|
|
|
/* Get the current state. */
|
|
old_fpescr = fpescr = fegetenv_register ();
|
|
|
|
/* Clear the relevant bits. */
|
|
fpescr &= ~SPEFSCR_ALL_EXCEPT;
|
|
|
|
/* Put the new state in effect. */
|
|
fesetenv_register (fpescr);
|
|
|
|
/* Let the kernel know if the "invalid" or "underflow" bit was
|
|
cleared. */
|
|
if (old_fpescr & (SPEFSCR_FINVS | SPEFSCR_FUNFS))
|
|
{
|
|
int pflags __attribute__ ((__unused__)), r;
|
|
INTERNAL_SYSCALL_DECL (err);
|
|
|
|
r = INTERNAL_SYSCALL (prctl, err, 2, PR_GET_FPEXC, &pflags);
|
|
if (INTERNAL_SYSCALL_ERROR_P (r, err))
|
|
abort ();
|
|
}
|
|
}
|