1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
/* Raise given exceptions.
Copyright (C) 2000, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Denis Joseph Barrow (djbarrow@de.ibm.com) and
Martin Schwidefsky (schwidefsky@de.ibm.com).
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <fenv_libc.h>
#include <float.h>
#include <math.h>
static __inline__ void
fexceptdiv (float d, float e)
{
__asm__ __volatile__ ("debr %0,%1" : : "f" (d), "f" (e) );
}
static __inline__ void
fexceptadd (float d, float e)
{
__asm__ __volatile__ ("aebr %0,%1" : : "f" (d), "f" (e) );
}
int
feraiseexcept (int excepts)
{
/* Raise exceptions represented by EXPECTS. But we must raise only
one signal at a time. It is important that if the overflow/underflow
exception and the inexact exception are given at the same time,
the overflow/underflow exception follows the inexact exception. */
/* First: invalid exception. */
if (FE_INVALID & excepts)
fexceptdiv (0.0, 0.0);
/* Next: division by zero. */
if (FE_DIVBYZERO & excepts)
fexceptdiv (1.0, 0.0);
/* Next: overflow. */
if (FE_OVERFLOW & excepts)
/* I don't think we can do the same trick as intel so we will have
to live with inexact coming also. */
fexceptadd (FLT_MAX, 1.0e32);
/* Next: underflow. */
if (FE_UNDERFLOW & excepts)
fexceptdiv (FLT_MIN, 3.0);
/* Last: inexact. */
if (FE_INEXACT & excepts)
fexceptdiv (2.0, 3.0);
/* Success. */
return 0;
}
libm_hidden_def (feraiseexcept)
|
