|
Packit |
6c4009 |
/* Install given floating-point environment.
|
|
Packit |
6c4009 |
Copyright (C) 1997-2018 Free Software Foundation, Inc.
|
|
Packit |
6c4009 |
This file is part of the GNU C Library.
|
|
Packit |
6c4009 |
Contributed by David Huggins-Daines <dhd@debian.org>, 2000
|
|
Packit |
6c4009 |
Based on the m68k version by
|
|
Packit |
6c4009 |
Andreas Schwab <schwab@suse.de>
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
The GNU C Library is free software; you can redistribute it and/or
|
|
Packit |
6c4009 |
modify it under the terms of the GNU Lesser General Public
|
|
Packit |
6c4009 |
License as published by the Free Software Foundation; either
|
|
Packit |
6c4009 |
version 2.1 of the License, or (at your option) any later version.
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
The GNU C Library is distributed in the hope that it will be useful,
|
|
Packit |
6c4009 |
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
Packit |
6c4009 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Packit |
6c4009 |
Lesser General Public License for more details.
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
You should have received a copy of the GNU Lesser General Public
|
|
Packit |
6c4009 |
License along with the GNU C Library. If not, see
|
|
Packit |
6c4009 |
<http://www.gnu.org/licenses/>. */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#include <fenv.h>
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
int
|
|
Packit |
6c4009 |
__fesetenv (const fenv_t *envp)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
union { unsigned long long buf[4]; fenv_t env; } temp;
|
|
Packit |
6c4009 |
unsigned long long *bufptr;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Install the environment specified by ENVP. But there are a few
|
|
Packit |
6c4009 |
values which we do not want to come from the saved environment.
|
|
Packit |
6c4009 |
Therefore, we get the current environment and replace the values
|
|
Packit |
6c4009 |
we want to use from the environment specified by the parameter. */
|
|
Packit |
6c4009 |
bufptr = temp.buf;
|
|
Packit |
6c4009 |
__asm__ (
|
|
Packit |
6c4009 |
"fstd %%fr0,0(%1)\n"
|
|
Packit |
6c4009 |
: "=m" (temp) : "r" (bufptr) : "%r0");
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
temp.env.__status_word &= ~(FE_ALL_EXCEPT
|
|
Packit |
6c4009 |
| (FE_ALL_EXCEPT << 27)
|
|
Packit |
6c4009 |
| FE_DOWNWARD);
|
|
Packit |
6c4009 |
if (envp == FE_DFL_ENV)
|
|
Packit |
6c4009 |
temp.env.__status_word = 0;
|
|
Packit |
6c4009 |
else if (envp == FE_NOMASK_ENV)
|
|
Packit |
6c4009 |
temp.env.__status_word |= FE_ALL_EXCEPT;
|
|
Packit |
6c4009 |
else
|
|
Packit |
6c4009 |
temp.env.__status_word |= (envp->__status_word
|
|
Packit |
6c4009 |
& (FE_ALL_EXCEPT
|
|
Packit |
6c4009 |
| FE_DOWNWARD
|
|
Packit |
6c4009 |
| (FE_ALL_EXCEPT << 27)));
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Load the new environment. We use bufptr again since the
|
|
Packit |
6c4009 |
initial asm has modified the value of the register and here
|
|
Packit |
6c4009 |
we take advantage of that to load in reverse order so fr0
|
|
Packit |
6c4009 |
is loaded last and T-Bit is enabled. */
|
|
Packit |
6c4009 |
__asm__ (
|
|
Packit |
6c4009 |
"fldd 0(%1),%%fr0\n"
|
|
Packit |
6c4009 |
: : "m" (temp), "r" (bufptr) : "%r0" );
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Success. */
|
|
Packit |
6c4009 |
return 0;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
libm_hidden_def (__fesetenv)
|
|
Packit |
6c4009 |
weak_alias (__fesetenv, fesetenv)
|
|
Packit |
6c4009 |
libm_hidden_weak (fesetenv)
|