mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-15 01:21:06 +00:00
55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
/* Disable floating-point exceptions.
|
|
Copyright (C) 1999, 2000, 2003, 2004 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Andreas Jaeger <aj@suse.de>, 1999.
|
|
|
|
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 <unistd.h>
|
|
#include <ldsodefs.h>
|
|
#include <dl-procinfo.h>
|
|
|
|
int
|
|
fedisableexcept (int excepts)
|
|
{
|
|
unsigned short int new_exc, old_exc;
|
|
|
|
/* Get the current control word. */
|
|
__asm__ ("fstcw %0" : "=m" (*&new_exc));
|
|
|
|
old_exc = (~new_exc) & FE_ALL_EXCEPT;
|
|
|
|
excepts &= FE_ALL_EXCEPT;
|
|
|
|
new_exc |= excepts;
|
|
__asm__ ("fldcw %0" : : "m" (*&new_exc));
|
|
|
|
/* If the CPU supports SSE we set the MXCSR as well. */
|
|
if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0)
|
|
{
|
|
unsigned int xnew_exc;
|
|
|
|
/* Get the current control word. */
|
|
__asm__ ("stmxcsr %0" : "=m" (*&xnew_exc));
|
|
|
|
xnew_exc |= excepts << 7;
|
|
|
|
__asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc));
|
|
}
|
|
|
|
return old_exc;
|
|
}
|