mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-14 23:30:06 +00:00
56 lines
1.9 KiB
C
56 lines
1.9 KiB
C
/* Install given floating-point environment and raise exceptions.
|
|
Copyright (C) 2000-2017 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
|
|
<http://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)
|