mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 23:10:06 +00:00
70 lines
2.1 KiB
C
70 lines
2.1 KiB
C
/* Clear given exceptions in current floating-point environment.
|
|
Copyright (C) 1997-2020 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
|
|
|
|
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 <unistd.h>
|
|
#include <ldsodefs.h>
|
|
#include <dl-procinfo.h>
|
|
|
|
int
|
|
__feclearexcept (int excepts)
|
|
{
|
|
fenv_t temp;
|
|
|
|
/* Mask out unsupported bits/exceptions. */
|
|
excepts &= FE_ALL_EXCEPT;
|
|
|
|
/* Bah, we have to clear selected exceptions. Since there is no
|
|
`fldsw' instruction we have to do it the hard way. */
|
|
__asm__ ("fnstenv %0" : "=m" (*&temp));
|
|
|
|
/* Clear the relevant bits. */
|
|
temp.__status_word &= excepts ^ FE_ALL_EXCEPT;
|
|
|
|
/* Put the new data in effect. */
|
|
__asm__ ("fldenv %0" : : "m" (*&temp));
|
|
|
|
/* If the CPU supports SSE, we clear the MXCSR as well. */
|
|
if (HAS_CPU_FEATURE (SSE))
|
|
{
|
|
unsigned int xnew_exc;
|
|
|
|
/* Get the current MXCSR. */
|
|
__asm__ ("stmxcsr %0" : "=m" (*&xnew_exc));
|
|
|
|
/* Clear the relevant bits. */
|
|
xnew_exc &= ~excepts;
|
|
|
|
/* Put the new data in effect. */
|
|
__asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc));
|
|
}
|
|
|
|
/* Success. */
|
|
return 0;
|
|
}
|
|
|
|
#include <shlib-compat.h>
|
|
#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
|
|
strong_alias (__feclearexcept, __old_feclearexcept)
|
|
compat_symbol (libm, __old_feclearexcept, feclearexcept, GLIBC_2_1);
|
|
#endif
|
|
|
|
libm_hidden_ver (__feclearexcept, feclearexcept)
|
|
versioned_symbol (libm, __feclearexcept, feclearexcept, GLIBC_2_2);
|