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, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
26 fesetexceptflag (const fexcept_t *flagp, int excepts)
30 /* Get the current environment. We have to do this since we cannot
31 separately set the status word. */
32 __asm__ ("fnstenv %0" : "=m" (*&temp));
34 temp.__status_word &= ~(excepts & FE_ALL_EXCEPT);
35 temp.__status_word |= *flagp & excepts & FE_ALL_EXCEPT;
37 /* Store the new status word (along with the rest of the environment.
38 Possibly new exceptions are set but they won't get executed unless
39 the next floating-point instruction. */
40 __asm__ ("fldenv %0" : : "m" (*&temp));
43 /* If the CPU supports SSE, we set the MXCSR as well. */
44 if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0)
46 unsigned int xnew_exc;
48 /* Get the current MXCSR. */
49 __asm__ ("stmxcsr %0" : "=m" (*&xnew_exc));
51 /* Set the relevant bits. */
52 xnew_exc &= ~(excepts & FE_ALL_EXCEPT);
53 xnew_exc |= *flagp & excepts & FE_ALL_EXCEPT;
55 /* Put the new data in effect. */
56 __asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc));