1 /* Disable floating-point exceptions.
2 Copyright (C) 1999, 2000, 2003, 2004 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Andreas Jaeger <aj@suse.de>, 1999.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
24 fedisableexcept (int excepts)
26 unsigned short int new_exc, old_exc;
28 /* Get the current control word. */
29 __asm__ ("fstcw %0" : "=m" (*&new_exc));
31 old_exc = (~new_exc) & FE_ALL_EXCEPT;
33 excepts &= FE_ALL_EXCEPT;
36 __asm__ ("fldcw %0" : : "m" (*&new_exc));
39 /* If the CPU supports SSE we set the MXCSR as well. */
40 if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0)
42 unsigned int xnew_exc;
44 /* Get the current control word. */
45 __asm__ ("stmxcsr %0" : "=m" (*&xnew_exc));
47 xnew_exc |= excepts << 7;
49 __asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc));