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/* Clear given exceptions in current floating-point environment.
Copyright (C) 2001-2020 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
<https://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)
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