1 /* Copyright (C) 2012-2014 Free Software Foundation, Inc.
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
__atomic_feraiseexcept(int excepts)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 }
73