1 /* Set floating-point environment exception handling.
2 Copyright (C) 1997,99,2000,01, 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/>. */
25 #include <dl-procinfo.h>
28 __fesetexceptflag (const fexcept_t *flagp, int excepts)
32 /* Get the current environment. We have to do this since we cannot
33 separately set the status word. */
34 __asm__ ("fnstenv %0" : "=m" (*&temp));
36 temp.__status_word &= ~(excepts & FE_ALL_EXCEPT);
37 temp.__status_word |= *flagp & excepts & FE_ALL_EXCEPT;
39 /* Store the new status word (along with the rest of the environment.
40 Possibly new exceptions are set but they won't get executed unless
41 the next floating-point instruction. */
42 __asm__ ("fldenv %0" : : "m" (*&temp));
44 /* If the CPU supports SSE, we set the MXCSR as well. */
45 if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0)
47 unsigned int xnew_exc;
49 /* Get the current MXCSR. */
50 __asm__ ("stmxcsr %0" : "=m" (*&xnew_exc));
52 /* Set the relevant bits. */
53 xnew_exc &= ~(excepts & FE_ALL_EXCEPT);
54 xnew_exc |= *flagp & excepts & FE_ALL_EXCEPT;
56 /* Put the new data in effect. */
57 __asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc));
64 #include <shlib-compat.h>
65 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
66 strong_alias (__fesetexceptflag, __old_fesetexceptflag)
67 compat_symbol (libm, BP_SYM (__old_fesetexceptflag), BP_SYM (fesetexceptflag), GLIBC_2_1);
70 versioned_symbol (libm, BP_SYM (__fesetexceptflag), BP_SYM (fesetexceptflag), GLIBC_2_2);