1 | /* Enable floating-point exceptions. |
2 | Copyright (C) 1999-2022 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <fenv.h> |
20 | #include <unistd.h> |
21 | #include <ldsodefs.h> |
22 | #include <dl-procinfo.h> |
23 | |
24 | int |
25 | feenableexcept (int excepts) |
26 | { |
27 | unsigned short int new_exc; |
28 | unsigned short int old_exc; |
29 | |
30 | /* Get the current control word. */ |
31 | __asm__ ("fstcw %0" : "=m" (*&new_exc)); |
32 | |
33 | excepts &= FE_ALL_EXCEPT; |
34 | old_exc = (~new_exc) & FE_ALL_EXCEPT; |
35 | |
36 | new_exc &= ~excepts; |
37 | __asm__ ("fldcw %0" : : "m" (*&new_exc)); |
38 | |
39 | /* If the CPU supports SSE we set the MXCSR as well. */ |
40 | if (CPU_FEATURE_USABLE (SSE)) |
41 | { |
42 | unsigned int xnew_exc; |
43 | |
44 | /* Get the current control word. */ |
45 | __asm__ ("stmxcsr %0" : "=m" (*&xnew_exc)); |
46 | |
47 | xnew_exc &= ~(excepts << 7); |
48 | |
49 | __asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc)); |
50 | } |
51 | |
52 | return old_exc; |
53 | } |
54 | |