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[glibc.git] / sysdeps / i386 / fpu / feenablxcpt.c
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1 /* Enable floating-point exceptions.
2 Copyright (C) 1999-2015 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/>. */
20 #include <fenv.h>
21 #include <unistd.h>
22 #include <ldsodefs.h>
23 #include <dl-procinfo.h>
25 int
26 feenableexcept (int excepts)
28 unsigned short int new_exc;
29 unsigned short int old_exc;
31 /* Get the current control word. */
32 __asm__ ("fstcw %0" : "=m" (*&new_exc));
34 excepts &= FE_ALL_EXCEPT;
35 old_exc = (~new_exc) & FE_ALL_EXCEPT;
37 new_exc &= ~excepts;
38 __asm__ ("fldcw %0" : : "m" (*&new_exc));
40 /* If the CPU supports SSE we set the MXCSR as well. */
41 if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0)
43 unsigned int xnew_exc;
45 /* Get the current control word. */
46 __asm__ ("stmxcsr %0" : "=m" (*&xnew_exc));
48 xnew_exc &= ~(excepts << 7);
50 __asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc));
53 return old_exc;