blob: 66919b8b807f88aa7d60b8d7b8a52e909037c04a (
plain)
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
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
/* FPU-related code for systems with GNU libc.
Copyright (C) 2005-2013 Free Software Foundation, Inc.
Contributed by Francois-Xavier Coudert <coudert@clipper.ens.fr>
This file is part of the GNU Fortran runtime library (libgfortran).
Libgfortran is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
Libgfortran 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 General Public License for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
/* FPU-related code for systems with the GNU libc, providing the
feenableexcept function in fenv.h to set individual exceptions
(there's nothing to do that in C99). */
#ifdef HAVE_FENV_H
#include <fenv.h>
#endif
void set_fpu (void)
{
if (FE_ALL_EXCEPT != 0)
fedisableexcept (FE_ALL_EXCEPT);
if (options.fpe & GFC_FPE_INVALID)
#ifdef FE_INVALID
feenableexcept (FE_INVALID);
#else
estr_write ("Fortran runtime warning: IEEE 'invalid operation' "
"exception not supported.\n");
#endif
/* glibc does never have a FE_DENORMAL. */
if (options.fpe & GFC_FPE_DENORMAL)
#ifdef FE_DENORMAL
feenableexcept (FE_DENORMAL);
#else
estr_write ("Fortran runtime warning: Floating point 'denormal operand' "
"exception not supported.\n");
#endif
if (options.fpe & GFC_FPE_ZERO)
#ifdef FE_DIVBYZERO
feenableexcept (FE_DIVBYZERO);
#else
estr_write ("Fortran runtime warning: IEEE 'division by zero' "
"exception not supported.\n");
#endif
if (options.fpe & GFC_FPE_OVERFLOW)
#ifdef FE_OVERFLOW
feenableexcept (FE_OVERFLOW);
#else
estr_write ("Fortran runtime warning: IEEE 'overflow' "
"exception not supported.\n");
#endif
if (options.fpe & GFC_FPE_UNDERFLOW)
#ifdef FE_UNDERFLOW
feenableexcept (FE_UNDERFLOW);
#else
estr_write ("Fortran runtime warning: IEEE 'underflow' "
"exception not supported.\n");
#endif
if (options.fpe & GFC_FPE_INEXACT)
#ifdef FE_INEXACT
feenableexcept (FE_INEXACT);
#else
estr_write ("Fortran runtime warning: IEEE 'inexact' "
"exception not supported.\n");
#endif
}
int
get_fpu_except_flags (void)
{
int result, set_excepts;
result = 0;
set_excepts = fetestexcept (FE_ALL_EXCEPT);
#ifdef FE_INVALID
if (set_excepts & FE_INVALID)
result |= GFC_FPE_INVALID;
#endif
#ifdef FE_DIVBYZERO
if (set_excepts & FE_DIVBYZERO)
result |= GFC_FPE_ZERO;
#endif
#ifdef FE_OVERFLOW
if (set_excepts & FE_OVERFLOW)
result |= GFC_FPE_OVERFLOW;
#endif
#ifdef FE_UNDERFLOW
if (set_excepts & FE_UNDERFLOW)
result |= GFC_FPE_UNDERFLOW;
#endif
#ifdef FE_DENORMAL
if (set_excepts & FE_DENORMAL)
result |= GFC_FPE_DENORMAL;
#endif
#ifdef FE_INEXACT
if (set_excepts & FE_INEXACT)
result |= GFC_FPE_INEXACT;
#endif
return result;
}
int
get_fpu_rounding_mode (void)
{
int rnd_mode;
rnd_mode = fegetround ();
switch (rnd_mode)
{
#ifdef FE_TONEAREST
case FE_TONEAREST:
return GFC_FPE_TONEAREST;
#endif
#ifdef FE_UPWARD
case FE_UPWARD:
return GFC_FPE_UPWARD;
#endif
#ifdef FE_DOWNWARD
case FE_DOWNWARD:
return GFC_FPE_DOWNWARD;
#endif
#ifdef FE_TOWARDZERO
case FE_TOWARDZERO:
return GFC_FPE_TOWARDZERO;
#endif
default:
return GFC_FPE_INVALID;
}
}
void
set_fpu_rounding_mode (int mode)
{
int rnd_mode;
switch (mode)
{
#ifdef FE_TONEAREST
case GFC_FPE_TONEAREST:
rnd_mode = FE_TONEAREST;
break;
#endif
#ifdef FE_UPWARD
case GFC_FPE_UPWARD:
rnd_mode = FE_UPWARD;
break;
#endif
#ifdef FE_DOWNWARD
case GFC_FPE_DOWNWARD:
rnd_mode = FE_DOWNWARD;
break;
#endif
#ifdef FE_TOWARDZERO
case GFC_FPE_TOWARDZERO:
rnd_mode = FE_TOWARDZERO;
break;
#endif
default:
return;
}
fesetround (rnd_mode);
}
|
