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
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
/* Raise given exceptions.
Copyright (C) 2018-2021 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 <fenv_libc.h>
#include <fpu_control.h>
#include <float.h>
#include <math.h>
int
__feraiseexcept (int excepts)
{
/* Raise exceptions represented by EXCEPTS. But we must raise only one
signal at a time. It is important that if the overflow/underflow
exception and the divide by zero exception are given at the same
time, the overflow/underflow exception follows the divide by zero
exception. */
# ifndef __csky_fpuv1__
/* First: invalid exception. */
if (FE_INVALID & excepts)
{
/* One example of a invalid operation is 0 * Infinity. */
float x = HUGE_VALF, y = 0.0f;
__asm__ __volatile__ ("fmuls %0, %0, %1" : "+v" (x) : "v" (y));
}
/* Next: division by zero. */
if (FE_DIVBYZERO & excepts)
{
float x = 1.0f, y = 0.0f;
__asm__ __volatile__ ("fdivs %0, %0, %1" : "+v" (x) : "v" (y));
}
/* Next: overflow. */
if (FE_OVERFLOW & excepts)
{
float x = FLT_MAX;
__asm__ __volatile__ ("fmuls %0, %0, %0" : "+v" (x));
}
/* Next: underflow. */
if (FE_UNDERFLOW & excepts)
{
float x = -FLT_MIN;
__asm__ __volatile__ ("fmuls %0, %0, %0" : "+v" (x));
}
/* Last: inexact. */
if (FE_INEXACT & excepts)
{
float x = 1.0f, y = 3.0f;
__asm__ __volatile__ ("fdivs %0, %0, %1" : "+v" (x) : "v" (y));
}
if (__FE_DENORMAL & excepts)
{
double x = 4.9406564584124654e-324;
__asm__ __volatile__ ("fstod %0, %0" : "+v" (x));
}
# else
int tmp = 0;
/* First: invalid exception. */
if (FE_INVALID & excepts)
{
/* One example of a invalid operation is 0 * Infinity. */
float x = HUGE_VALF, y = 0.0f;
__asm__ __volatile__ ("fmuls %0, %0, %2, %1"
: "+f" (x), "+r"(tmp) : "f" (y));
}
/* Next: division by zero. */
if (FE_DIVBYZERO & excepts)
{
float x = 1.0f, y = 0.0f;
__asm__ __volatile__ ("fdivs %0, %0, %2, %1"
: "+f" (x), "+r"(tmp) : "f" (y));
}
/* Next: overflow. */
if (FE_OVERFLOW & excepts)
{
float x = FLT_MAX, y = FLT_MAX;
__asm__ __volatile__ ("fmuls %0, %0, %2, %1"
: "+f" (x), "+r"(tmp) : "f" (y));
}
/* Next: underflow. */
if (FE_UNDERFLOW & excepts)
{
float x = -FLT_MIN, y = -FLT_MIN;
__asm__ __volatile__ ("fmuls %0, %0, %2, %1"
: "+f" (x), "+r"(tmp) : "f" (y));
}
/* Last: inexact. */
if (FE_INEXACT & excepts)
{
float x = 1.0f, y = 3.0f;
__asm__ __volatile__ ("fdivs %0, %0, %2, %1"
: "+f" (x), "+r"(tmp) : "f" (y));
}
# endif /* __csky_fpuv2__ */
/* Success. */
return 0;
}
libm_hidden_def (__feraiseexcept)
weak_alias (__feraiseexcept, feraiseexcept)
libm_hidden_weak (feraiseexcept)
|
