]>
Commit | Line | Data |
---|---|---|
d5efd131 | 1 | /* Raise given exceptions. |
b168057a | 2 | Copyright (C) 1997-2015 Free Software Foundation, Inc. |
d5efd131 MF |
3 | This file is part of the GNU C Library. |
4 | Contributed by Jes Sorensen <Jes.Sorensen@cern.ch>, 2000. | |
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 | |
75efb018 MF |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
d5efd131 MF |
19 | |
20 | #include <fenv.h> | |
21 | #include <float.h> | |
22 | #include <math.h> | |
23 | #include <signal.h> | |
24 | #include <unistd.h> | |
25 | ||
26 | int | |
0747f818 | 27 | __feraiseexcept (int excepts) |
d5efd131 MF |
28 | { |
29 | double tmp; | |
30 | double dummy; | |
31 | ||
32 | /* Raise exceptions represented by EXPECTS. But we must raise only | |
33 | one signal at a time. It is important the if the overflow/underflow | |
34 | exception and the inexact exception are given at the same time, | |
35 | the overflow/underflow exception precedes the inexact exception. */ | |
36 | ||
37 | /* We do these bits in assembly to be certain GCC doesn't optimize | |
38 | away something important. */ | |
39 | ||
40 | /* First: invalid exception. */ | |
41 | if (FE_INVALID & excepts) | |
42 | { | |
c0c3f78a | 43 | /* One example of an invalid operation is 0 * Infinity. */ |
d5efd131 MF |
44 | tmp = 0; |
45 | __asm__ __volatile__ ("frcpa.s0 %0,p1=f0,f0" : "=f" (tmp) : : "p1" ); | |
46 | } | |
47 | ||
48 | /* Next: division by zero. */ | |
49 | if (FE_DIVBYZERO & excepts) | |
50 | __asm__ __volatile__ ("frcpa.s0 %0,p1=f1,f0" : "=f" (tmp) : : "p1" ); | |
51 | ||
52 | /* Next: overflow. */ | |
53 | if (FE_OVERFLOW & excepts) | |
54 | { | |
55 | dummy = DBL_MAX; | |
56 | ||
57 | __asm__ __volatile__ ("fadd.d.s0 %0=%1,%1" : "=f" (dummy) : "0" (dummy)); | |
58 | } | |
59 | ||
60 | /* Next: underflow. */ | |
61 | if (FE_UNDERFLOW & excepts) | |
62 | { | |
63 | dummy = DBL_MIN; | |
64 | ||
65 | __asm__ __volatile__ ("fnma.d.s0 %0=%1,%1,f0" : "=f" (tmp) : "f" (dummy)); | |
66 | } | |
67 | ||
68 | /* Last: inexact. */ | |
69 | if (FE_INEXACT & excepts) | |
70 | { | |
71 | dummy = DBL_MAX; | |
72 | __asm__ __volatile__ ("fsub.d.s0 %0=%1,f1" : "=f" (dummy) : "0" (dummy)); | |
73 | } | |
74 | ||
75 | /* Success. */ | |
76 | return 0; | |
77 | } | |
0747f818 JM |
78 | libm_hidden_def (__feraiseexcept) |
79 | weak_alias (__feraiseexcept, feraiseexcept) | |
80 | libm_hidden_weak (feraiseexcept) |