1 /* Clear given exceptions in current floating-point environment.
2 Copyright (C) 1997,99,2000, 2001, 2003, 2004 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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 feclearexcept (int excepts)
28 /* Mask out unsupported bits/exceptions. */
29 excepts &= FE_ALL_EXCEPT;
31 /* Bah, we have to clear selected exceptions. Since there is no
32 `fldsw' instruction we have to do it the hard way. */
33 __asm__ ("fnstenv %0" : "=m" (*&temp));
35 /* Clear the relevant bits. */
36 temp.__status_word &= excepts ^ FE_ALL_EXCEPT;
38 /* Put the new data in effect. */
39 __asm__ ("fldenv %0" : : "m" (*&temp));
42 /* If the CPU supports SSE, we clear the MXCSR as well. */
43 if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0)
45 unsigned int xnew_exc;
47 /* Get the current MXCSR. */
48 __asm__ ("stmxcsr %0" : "=m" (*&xnew_exc));
50 /* Clear the relevant bits. */
53 /* Put the new data in effect. */
54 __asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc));