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Linux/HPPA specific fesetenv implementation.

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This commit is contained in:
Ulrich Drepper 2000-10-15 03:34:57 +00:00
parent 1f8d3bd8e7
commit 1d53eb01ef
1 changed files with 70 additions and 0 deletions
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70
sysdeps/hppa/fpu/fesetenv.c Normal file
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/* Install given floating-point environment.
Copyright (C) 1997, 1999, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by David Huggins-Daines <dhd@debian.org>, 2000
Based on the m68k version by
Andreas Schwab <schwab@suse.de>
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <fenv.h>
int
fesetenv (const fenv_t *envp)
{
fenv_t temp;
/* Install the environment specified by ENVP. But there are a few
values which we do not want to come from the saved environment.
Therefore, we get the current environment and replace the values
we want to use from the environment specified by the parameter. */
{
fenv_t * _regs = &temp;
__asm__ (
"fstd %%fr0,0(%2)\n"
"fstd,ma %%fr1,8(%2)\n"
"fstd,ma %%fr2,8(%2)\n"
"fstd %%fr3,0(%2)\n"
: "=m" (*_regs), "=r" (_regs) : "1" (_regs));
}
temp.__status_word &= ~(FE_ALL_EXCEPT
| (FE_ALL_EXCEPT << 27)
| FE_DOWNWARD);
if (envp == FE_DFL_ENV)
;
else if (envp == FE_NOMASK_ENV)
temp.__status_word |= FE_ALL_EXCEPT;
else
temp.__status_word |= (envp->__status_word
& (FE_ALL_EXCEPT
| FE_DOWNWARD
| (FE_ALL_EXCEPT << 27)));
/* Load the new environment. */
{
fenv_t * _regs = &temp + 1;
__asm__ (
"fldd,mb -8(%2),%%fr3\n"
"fldd,mb -8(%2),%%fr2\n"
"fldd,mb -8(%2),%%fr1\n"
"fldd -8(%2),%%fr0\n"
: "=m" (*_regs), "=r" (_regs) : "1" (_regs));
}
/* Success. */
return 0;
}