1 /* Store current floating-point environment and clear exceptions.
2 Copyright (C) 1997-2012 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/>. */
23 #include <dl-procinfo.h>
26 feholdexcept (fenv_t *envp)
28 /* Store the environment. Recall that fnstenv has a side effect of
29 masking all exceptions. Then clear all exceptions. */
30 __asm__ volatile ("fnstenv %0; fnclex" : "=m" (*envp));
32 /* If the CPU supports SSE we set the MXCSR as well. */
33 if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0)
37 /* Get the current control word. */
38 __asm__ ("stmxcsr %0" : "=m" (*&xwork));
40 /* Set all exceptions to non-stop and clear them. */
41 xwork = (xwork | 0x1f80) & ~0x3f;
43 __asm__ ("ldmxcsr %0" : : "m" (*&xwork));
48 libm_hidden_def (feholdexcept)