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
|
/* Raise given exceptions.
Copyright (C) 1997-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Nobuhiro Iwamatsu <iwamatsu@nigauri.org>, 2012.
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.h>
#include <float.h>
#include <fpu_control.h>
#include <math.h>
int
__feraiseexcept (int excepts)
{
if (excepts == 0)
return 0;
/* Raise exceptions represented by EXPECTS. */
if (excepts & FE_INEXACT)
{
double d = 1.0, x = 3.0;
__asm__ __volatile__ ("fdiv %1, %0" : "+d" (d) : "d" (x));
}
if (excepts & FE_UNDERFLOW)
{
long double d = LDBL_MIN, x = 10;
__asm__ __volatile__ ("fdiv %1, %0" : "+d" (d) : "d" (x));
}
if (excepts & FE_OVERFLOW)
{
long double d = LDBL_MAX;
__asm__ __volatile__ ("fmul %0, %0" : "+d" (d) : "d" (d));
}
if (excepts & FE_DIVBYZERO)
{
double d = 1.0, x = 0.0;
__asm__ __volatile__ ("fdiv %1, %0" : "+d" (d) : "d" (x));
}
if (excepts & FE_INVALID)
{
double d = HUGE_VAL, x = 0.0;
__asm__ __volatile__ ("fmul %1, %0" : "+d" (d) : "d" (x));
}
{
/* Restore flag fields. */
fpu_control_t cw;
_FPU_GETCW (cw);
cw |= (excepts & FE_ALL_EXCEPT);
_FPU_SETCW (cw);
}
return 0;
}
libm_hidden_def (__feraiseexcept)
weak_alias (__feraiseexcept, feraiseexcept)
libm_hidden_weak (feraiseexcept)
|
