mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 23:10:06 +00:00
53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
/* Clear given exceptions in current floating-point environment.
|
|
Copyright (C) 2001-2017 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.h>
|
|
|
|
int
|
|
feclearexcept (int excepts)
|
|
{
|
|
fenv_t temp;
|
|
unsigned int mxcsr;
|
|
|
|
/* 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));
|
|
|
|
/* And the same procedure for SSE. */
|
|
__asm__ ("stmxcsr %0" : "=m" (*&mxcsr));
|
|
|
|
/* Clear the relevant bits. */
|
|
mxcsr &= ~excepts;
|
|
|
|
/* And put them into effect. */
|
|
__asm__ ("ldmxcsr %0" : : "m" (*&mxcsr));
|
|
|
|
/* Success. */
|
|
return 0;
|
|
}
|
|
libm_hidden_def (feclearexcept)
|