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c72aa4a2 UD |
1 | /* Raise given exceptions. |
2 | Copyright (C) 1997 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Library General Public License as | |
8 | published by the Free Software Foundation; either version 2 of the | |
9 | 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 | Library General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Library General Public | |
17 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
18 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | #include <fenv.h> | |
22 | #include <math.h> | |
23 | ||
24 | void | |
25 | feraiseexcept (int excepts) | |
26 | { | |
27 | /* Raise exceptions represented by EXCEPTS. But we must raise only one | |
28 | signal at a time. It is important that if the overflow/underflow | |
29 | exception and the divide by zero exception are given at the same | |
30 | time, the overflow/underflow exception follows the divide by zero | |
31 | exception. */ | |
32 | ||
33 | /* First: invalid exception. */ | |
34 | if (excepts & FE_INVALID) | |
35 | { | |
36 | /* One example of a invalid operation is 0 * Infinity. */ | |
d9814880 UD |
37 | double d = HUGE_VAL; |
38 | __asm__ __volatile__ ("fmul%.s %#0r0,%0; fnop" : "=f" (d) : "0" (d)); | |
c72aa4a2 UD |
39 | } |
40 | ||
41 | /* Next: division by zero. */ | |
42 | if (excepts & FE_DIVBYZERO) | |
43 | { | |
44 | double d = 1.0; | |
45 | __asm__ __volatile__ ("fdiv%.s %#0r0,%0; fnop" : "=f" (d) : "0" (d)); | |
46 | } | |
47 | ||
48 | /* Next: overflow. */ | |
49 | if (excepts & FE_OVERFLOW) | |
50 | { | |
d9814880 | 51 | long double d = LDBL_MAX; |
c49416b5 | 52 | |
75dc7e89 | 53 | __asm__ __volatile__ ("fmul%.x %0,%0; fnop" : "=f" (d) : "0" (d)); |
c72aa4a2 UD |
54 | } |
55 | ||
56 | /* Next: underflow. */ | |
57 | if (excepts & FE_UNDERFLOW) | |
58 | { | |
c49416b5 | 59 | long double d = -LDBL_MAX; |
c49416b5 | 60 | |
75dc7e89 | 61 | __asm__ __volatile__ ("fetox%.x %0; fnop" : "=f" (d) : "0" (d)); |
c72aa4a2 UD |
62 | } |
63 | ||
64 | /* Last: inexact. */ | |
65 | if (excepts & FE_INEXACT) | |
66 | { | |
d9814880 UD |
67 | long double d = 1.0; |
68 | __asm__ __volatile__ ("fdiv%.s %#0r3,%0; fnop" : "=f" (d) : "0" (d)); | |
c72aa4a2 UD |
69 | } |
70 | } |