49 lines
1.9 KiB
C
49 lines
1.9 KiB
C
/* Install given floating-point environment.
|
|
Copyright (C) 1997 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.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>
|
|
|
|
void
|
|
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. */
|
|
__asm__ ("fmovem%.l %/fpcr/%/fpsr/%/fpiar,%0" : "=m" (*&temp));
|
|
|
|
temp.status_register &= ~FE_ALL_EXCEPT;
|
|
temp.control_register &= ~((FE_ALL_EXCEPT << 6) | FE_UPWARD);
|
|
if (envp == FE_DFL_ENV)
|
|
;
|
|
else if (envp == FE_NOMASK_ENV)
|
|
temp.control_register |= FE_ALL_EXCEPT << 6;
|
|
else
|
|
{
|
|
temp.control_register |= (envp->control_register
|
|
& ((FE_ALL_EXCEPT << 6) | FE_UPWARD));
|
|
temp.status_register |= envp->status_register & FE_ALL_EXCEPT;
|
|
}
|
|
|
|
__asm__ __volatile__ ("fmovem%.l %0,%/fpcr/%/fpsr/%/fpiar" : : "m" (*&temp));
|
|
}
|