54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
/* Store current floating-point environment and clear exceptions.
|
|
Copyright (C) 1997, 1999, 2003 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
|
|
|
|
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, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <fenv.h>
|
|
#include <unistd.h>
|
|
#include <ldsodefs.h>
|
|
#include <dl-procinfo.h>
|
|
|
|
int
|
|
feholdexcept (fenv_t *envp)
|
|
{
|
|
unsigned short int work;
|
|
|
|
/* Store the environment. */
|
|
__asm__ ("fnstenv %0" : "=m" (*envp));
|
|
|
|
/* Now set all exceptions to non-stop. */
|
|
work = envp->__control_word | 0x3f;
|
|
__asm__ ("fldcw %0" : : "m" (*&work));
|
|
|
|
/* If the CPU supports SSE we set the MXCSR as well. */
|
|
if ((GL(dl_hwcap) & HWCAP_I386_XMM) != 0)
|
|
{
|
|
unsigned int xwork;
|
|
|
|
/* Get the current control word. */
|
|
__asm__ ("stmxcsr %0" : "=m" (*&xwork));
|
|
|
|
/* Set all exceptions to non-stop. */
|
|
xwork |= 0x1f80;
|
|
|
|
__asm__ ("ldmxcsr %0" : : "m" (*&xwork));
|
|
}
|
|
|
|
return 0;
|
|
}
|