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d5efd131 MF |
1 | /* Raise given exceptions. |
2 | Copyright (C) 1997, 1998, 2000, 2001, 2002, 2007 | |
3 | Free Software Foundation, Inc. | |
4 | This file is part of the GNU C Library. | |
5 | Contributed by Jes Sorensen <Jes.Sorensen@cern.ch>, 2000. | |
6 | ||
7 | The GNU C Library is free software; you can redistribute it and/or | |
8 | modify it under the terms of the GNU Lesser General Public | |
9 | License as published by the Free Software Foundation; either | |
10 | version 2.1 of the License, or (at your option) any later version. | |
11 | ||
12 | The GNU C Library is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public | |
18 | License along with the GNU C Library; if not, write to the Free | |
19 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
20 | 02111-1307 USA. */ | |
21 | ||
22 | #include <fenv.h> | |
23 | #include <float.h> | |
24 | #include <math.h> | |
25 | #include <signal.h> | |
26 | #include <unistd.h> | |
27 | ||
28 | int | |
29 | feraiseexcept (int excepts) | |
30 | { | |
31 | double tmp; | |
32 | double dummy; | |
33 | ||
34 | /* Raise exceptions represented by EXPECTS. But we must raise only | |
35 | one signal at a time. It is important the if the overflow/underflow | |
36 | exception and the inexact exception are given at the same time, | |
37 | the overflow/underflow exception precedes the inexact exception. */ | |
38 | ||
39 | /* We do these bits in assembly to be certain GCC doesn't optimize | |
40 | away something important. */ | |
41 | ||
42 | /* First: invalid exception. */ | |
43 | if (FE_INVALID & excepts) | |
44 | { | |
45 | /* One example of a invalid operation is 0 * Infinity. */ | |
46 | tmp = 0; | |
47 | __asm__ __volatile__ ("frcpa.s0 %0,p1=f0,f0" : "=f" (tmp) : : "p1" ); | |
48 | } | |
49 | ||
50 | /* Next: division by zero. */ | |
51 | if (FE_DIVBYZERO & excepts) | |
52 | __asm__ __volatile__ ("frcpa.s0 %0,p1=f1,f0" : "=f" (tmp) : : "p1" ); | |
53 | ||
54 | /* Next: overflow. */ | |
55 | if (FE_OVERFLOW & excepts) | |
56 | { | |
57 | dummy = DBL_MAX; | |
58 | ||
59 | __asm__ __volatile__ ("fadd.d.s0 %0=%1,%1" : "=f" (dummy) : "0" (dummy)); | |
60 | } | |
61 | ||
62 | /* Next: underflow. */ | |
63 | if (FE_UNDERFLOW & excepts) | |
64 | { | |
65 | dummy = DBL_MIN; | |
66 | ||
67 | __asm__ __volatile__ ("fnma.d.s0 %0=%1,%1,f0" : "=f" (tmp) : "f" (dummy)); | |
68 | } | |
69 | ||
70 | /* Last: inexact. */ | |
71 | if (FE_INEXACT & excepts) | |
72 | { | |
73 | dummy = DBL_MAX; | |
74 | __asm__ __volatile__ ("fsub.d.s0 %0=%1,f1" : "=f" (dummy) : "0" (dummy)); | |
75 | } | |
76 | ||
77 | /* Success. */ | |
78 | return 0; | |
79 | } | |
80 | libm_hidden_def (feraiseexcept) |