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a5544970 | 1 | /* Copyright (C) 2012-2019 Free Software Foundation, Inc. |
267bac10 JM |
2 | |
3 | This file is part of the GNU Atomic Library (libatomic). | |
4 | ||
5 | Libatomic is free software; you can redistribute it and/or modify it | |
6 | under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | Libatomic is distributed in the hope that it will be useful, but WITHOUT ANY | |
11 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
12 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | more details. | |
14 | ||
15 | Under Section 7 of GPL version 3, you are granted additional | |
16 | permissions described in the GCC Runtime Library Exception, version | |
17 | 3.1, as published by the Free Software Foundation. | |
18 | ||
19 | You should have received a copy of the GNU General Public License and | |
20 | a copy of the GCC Runtime Library Exception along with this program; | |
21 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
22 | <http://www.gnu.org/licenses/>. */ | |
23 | ||
24 | #include "libatomic_i.h" | |
25 | ||
26 | #ifdef HAVE_FENV_H | |
27 | # include <fenv.h> | |
28 | #endif | |
29 | ||
30 | /* Raise the supported floating-point exceptions from EXCEPTS. Other | |
31 | bits in EXCEPTS are ignored. */ | |
32 | ||
33 | void | |
34 | __atomic_feraiseexcept (int excepts __attribute__ ((unused))) | |
35 | { | |
36 | volatile float r __attribute__ ((unused)); | |
37 | #ifdef FE_INVALID | |
38 | if (excepts & FE_INVALID) | |
39 | { | |
40 | volatile float zero = 0.0f; | |
41 | r = zero / zero; | |
42 | } | |
43 | #endif | |
44 | #ifdef FE_DIVBYZERO | |
45 | if (excepts & FE_DIVBYZERO) | |
46 | { | |
47 | volatile float zero = 0.0f; | |
48 | r = 1.0f / zero; | |
49 | } | |
50 | #endif | |
51 | #ifdef FE_OVERFLOW | |
52 | if (excepts & FE_OVERFLOW) | |
53 | { | |
54 | volatile float max = __FLT_MAX__; | |
55 | r = max * max; | |
56 | } | |
57 | #endif | |
58 | #ifdef FE_UNDERFLOW | |
59 | if (excepts & FE_UNDERFLOW) | |
60 | { | |
61 | volatile float min = __FLT_MIN__; | |
62 | r = min * min; | |
63 | } | |
64 | #endif | |
65 | #ifdef FE_INEXACT | |
66 | if (excepts & FE_INEXACT) | |
67 | { | |
68 | volatile float three = 3.0f; | |
69 | r = 1.0f / three; | |
70 | } | |
71 | #endif | |
72 | } |