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
73
74
75
76
77
78
79
|
/* Raise given exceptions.
Copyright (C) 1997-2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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
<https://www.gnu.org/licenses/>. */
#include <fenv.h>
#include <float.h>
#include <math.h>
#include <signal.h>
#include <unistd.h>
int
__feraiseexcept (int excepts)
{
double tmp;
double dummy;
/* Raise exceptions represented by EXPECTS. But we must raise only
one signal at a time. It is important the if the overflow/underflow
exception and the inexact exception are given at the same time,
the overflow/underflow exception precedes the inexact exception. */
/* We do these bits in assembly to be certain GCC doesn't optimize
away something important. */
/* First: invalid exception. */
if (FE_INVALID & excepts)
{
/* One example of an invalid operation is 0 * Infinity. */
tmp = 0;
__asm__ __volatile__ ("frcpa.s0 %0,p1=f0,f0" : "=f" (tmp) : : "p1" );
}
/* Next: division by zero. */
if (FE_DIVBYZERO & excepts)
__asm__ __volatile__ ("frcpa.s0 %0,p1=f1,f0" : "=f" (tmp) : : "p1" );
/* Next: overflow. */
if (FE_OVERFLOW & excepts)
{
dummy = DBL_MAX;
__asm__ __volatile__ ("fadd.d.s0 %0=%1,%1" : "=f" (dummy) : "0" (dummy));
}
/* Next: underflow. */
if (FE_UNDERFLOW & excepts)
{
dummy = DBL_MIN;
__asm__ __volatile__ ("fnma.d.s0 %0=%1,%1,f0" : "=f" (tmp) : "f" (dummy));
}
/* Last: inexact. */
if (FE_INEXACT & excepts)
{
dummy = DBL_MAX;
__asm__ __volatile__ ("fsub.d.s0 %0=%1,f1" : "=f" (dummy) : "0" (dummy));
}
/* Success. */
return 0;
}
libm_hidden_def (__feraiseexcept)
weak_alias (__feraiseexcept, feraiseexcept)
libm_hidden_weak (feraiseexcept)
|
