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/* Install given floating-point environment and raise exceptions.
Copyright (C) 2000-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by David Huggins-Daines <dhd@debian.org>, 2000
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 <string.h>
int
__feupdateenv (const fenv_t *envp)
{
union { unsigned long long l; unsigned int sw[2]; } s;
fenv_t temp;
/* Get the current exception status */
__asm__ ("fstd %%fr0,0(%1) \n\t"
"fldd 0(%1),%%fr0 \n\t"
: "=m" (s.l) : "r" (&s.l));
/* Given environment with exception flags not cleared. */
if ((envp != FE_DFL_ENV) && (envp != FE_NOMASK_ENV))
{
memcpy(&temp, envp, sizeof (fenv_t));
temp.__status_word |= s.sw[0] & (FE_ALL_EXCEPT << 27);
}
/* Default environment with exception flags not cleared. */
if (envp == FE_DFL_ENV)
temp.__status_word = s.sw[0] & (FE_ALL_EXCEPT << 27);
/* All traps enabled and current exception flags not cleared. */
if (envp == FE_NOMASK_ENV)
temp.__status_word = (s.sw[0] & (FE_ALL_EXCEPT << 27)) | FE_ALL_EXCEPT;
/* Install new environment. */
__fesetenv (&temp);
/* Success. */
return 0;
}
libm_hidden_def (__feupdateenv)
weak_alias (__feupdateenv, feupdateenv)
libm_hidden_weak (feupdateenv)
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