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05ef7ce9 | 1 | /* Disable floating-point exceptions. |
04277e02 | 2 | Copyright (C) 1999-2019 Free Software Foundation, Inc. |
05ef7ce9 UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Andreas Jaeger <aj@suse.de>, 1999. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
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. | |
05ef7ce9 UD |
10 | |
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 | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
05ef7ce9 | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
05ef7ce9 UD |
19 | |
20 | #include <fenv.h> | |
e40468fa UD |
21 | #include <unistd.h> |
22 | #include <ldsodefs.h> | |
23 | #include <dl-procinfo.h> | |
05ef7ce9 UD |
24 | |
25 | int | |
26 | fedisableexcept (int excepts) | |
27 | { | |
28 | unsigned short int new_exc, old_exc; | |
ad04a62f | 29 | |
05ef7ce9 UD |
30 | /* Get the current control word. */ |
31 | __asm__ ("fstcw %0" : "=m" (*&new_exc)); | |
ad04a62f | 32 | |
522554b1 | 33 | old_exc = (~new_exc) & FE_ALL_EXCEPT; |
05ef7ce9 UD |
34 | |
35 | excepts &= FE_ALL_EXCEPT; | |
ad04a62f UD |
36 | |
37 | new_exc |= excepts; | |
05ef7ce9 UD |
38 | __asm__ ("fldcw %0" : : "m" (*&new_exc)); |
39 | ||
e40468fa | 40 | /* If the CPU supports SSE we set the MXCSR as well. */ |
bf773019 | 41 | if (HAS_CPU_FEATURE (SSE)) |
e40468fa UD |
42 | { |
43 | unsigned int xnew_exc; | |
44 | ||
45 | /* Get the current control word. */ | |
46 | __asm__ ("stmxcsr %0" : "=m" (*&xnew_exc)); | |
47 | ||
301a6724 | 48 | xnew_exc |= excepts << 7; |
e40468fa UD |
49 | |
50 | __asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc)); | |
51 | } | |
52 | ||
05ef7ce9 UD |
53 | return old_exc; |
54 | } |