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c9cf6dde | 1 | /* Disable floating-point exceptions. |
d614a753 | 2 | Copyright (C) 2001-2020 Free Software Foundation, Inc. |
c9cf6dde AJ |
3 | This file is part of the GNU C Library. |
4 | Contributed by Andreas Jaeger <aj@suse.de>, 2001. | |
5 | ||
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. | |
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 | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 17 | License along with the GNU C Library; if not, see |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
c9cf6dde AJ |
19 | |
20 | #include <fenv.h> | |
21 | ||
22 | int | |
23 | fedisableexcept (int excepts) | |
24 | { | |
25 | unsigned short int new_exc, old_exc; | |
a8c79c40 | 26 | unsigned int new; |
c9cf6dde AJ |
27 | |
28 | excepts &= FE_ALL_EXCEPT; | |
29 | ||
30 | /* Get the current control word of the x87 FPU. */ | |
31 | __asm__ ("fstcw %0" : "=m" (*&new_exc)); | |
32 | ||
33 | old_exc = (~new_exc) & FE_ALL_EXCEPT; | |
34 | ||
35 | new_exc |= excepts; | |
36 | __asm__ ("fldcw %0" : : "m" (*&new_exc)); | |
37 | ||
38 | /* And now the same for the SSE MXCSR register. */ | |
39 | __asm__ ("stmxcsr %0" : "=m" (*&new)); | |
40 | ||
41 | /* The SSE exception masks are shifted by 7 bits. */ | |
c9cf6dde AJ |
42 | new |= excepts << 7; |
43 | __asm__ ("ldmxcsr %0" : : "m" (*&new)); | |
44 | ||
45 | return old_exc; | |
46 | } |