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
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
|
/*-
* Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _FENV_H_
#define _FENV_H_
#include <sys/_types.h>
#ifndef __fenv_static
#define __fenv_static static
#endif
typedef __uint64_t fenv_t;
typedef __uint16_t fexcept_t;
/* Exception flags */
#define FE_INVALID 0x01
#define FE_DENORMAL 0x02
#define FE_DIVBYZERO 0x04
#define FE_OVERFLOW 0x08
#define FE_UNDERFLOW 0x10
#define FE_INEXACT 0x20
#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_DENORMAL | FE_INEXACT | \
FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
/* Rounding modes */
#define FE_TONEAREST 0x0000
#define FE_DOWNWARD 0x0400
#define FE_UPWARD 0x0800
#define FE_TOWARDZERO 0x0c00
#define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \
FE_UPWARD | FE_TOWARDZERO)
__BEGIN_DECLS
/* Default floating-point environment */
extern const fenv_t __fe_dfl_env;
#define FE_DFL_ENV (&__fe_dfl_env)
#define _FPUSW_SHIFT 13
#define __stfpsr(__r) __asm __volatile("mov %0=ar.fpsr" : "=r" (*(__r)))
#define __ldfpsr(__r) __asm __volatile("mov ar.fpsr=%0;;" : : "r" (__r))
__fenv_static inline int
feclearexcept(int __excepts)
{
fenv_t __fpsr;
__stfpsr(&__fpsr);
__fpsr &= ~((fenv_t)__excepts << _FPUSW_SHIFT);
__ldfpsr(__fpsr);
return (0);
}
__fenv_static inline int
fegetexceptflag(fexcept_t *__flagp, int __excepts)
{
fenv_t __fpsr;
__stfpsr(&__fpsr);
*__flagp = (fexcept_t)(__fpsr >> _FPUSW_SHIFT) & __excepts;
return (0);
}
__fenv_static inline int
fesetexceptflag(const fexcept_t *__flagp, int __excepts)
{
fenv_t __fpsr;
__stfpsr(&__fpsr);
__fpsr &= ~((fenv_t)__excepts << _FPUSW_SHIFT);
__fpsr |= (fenv_t)(__excepts & *__flagp) << _FPUSW_SHIFT;
__ldfpsr(__fpsr);
return (0);
}
/*
* It is worthwhile to use the inline version of this function iff it
* is called with arguments that are compile-time constants (due to
* dead code elimination). Unfortunately, gcc isn't smart enough to
* figure this out automatically, and there's no way to tell it.
* We assume that constant arguments will be the common case.
*/
__fenv_static inline int
feraiseexcept(int __excepts)
{
volatile double d;
/*
* With a compiler that supports the FENV_ACCESS pragma
* properly, simple expressions like '0.0 / 0.0' should
* be sufficient to generate traps. Unfortunately, we
* need to bring a volatile variable into the equation
* to prevent incorrect optimizations.
*/
if (__excepts & FE_INVALID) {
d = 0.0;
d = 0.0 / d;
}
if (__excepts & FE_DIVBYZERO) {
d = 0.0;
d = 1.0 / d;
}
if (__excepts & FE_OVERFLOW) {
d = 0x1.ffp1023;
d *= 2.0;
}
if (__excepts & FE_UNDERFLOW) {
d = 0x1p-1022;
d /= 0x1p1023;
}
if (__excepts & FE_INEXACT) {
d = 0x1p-1022;
d += 1.0;
}
return (0);
}
__fenv_static inline int
fetestexcept(int __excepts)
{
fenv_t __fpsr;
__stfpsr(&__fpsr);
return ((__fpsr >> _FPUSW_SHIFT) & __excepts);
}
__fenv_static inline int
fegetround(void)
{
fenv_t __fpsr;
__stfpsr(&__fpsr);
return (__fpsr & _ROUND_MASK);
}
__fenv_static inline int
fesetround(int __round)
{
fenv_t __fpsr;
if (__round & ~_ROUND_MASK)
return (-1);
__stfpsr(&__fpsr);
__fpsr &= ~_ROUND_MASK;
__fpsr |= __round;
__ldfpsr(__fpsr);
return (0);
}
__fenv_static inline int
fegetenv(fenv_t *__envp)
{
__stfpsr(__envp);
return (0);
}
__fenv_static inline int
feholdexcept(fenv_t *__envp)
{
fenv_t __fpsr;
__stfpsr(&__fpsr);
*__envp = __fpsr;
__fpsr &= ~((fenv_t)FE_ALL_EXCEPT << _FPUSW_SHIFT);
__fpsr |= FE_ALL_EXCEPT;
__ldfpsr(__fpsr);
return (0);
}
__fenv_static inline int
fesetenv(const fenv_t *__envp)
{
__ldfpsr(*__envp);
return (0);
}
int feupdateenv(const fenv_t *__envp);
#if __BSD_VISIBLE
/* We currently provide no external definitions of the functions below. */
static inline int
feenableexcept(int __mask)
{
fenv_t __newfpsr, __oldfpsr;
__stfpsr(&__oldfpsr);
__newfpsr = __oldfpsr & ~(__mask & FE_ALL_EXCEPT);
__ldfpsr(__newfpsr);
return (~__oldfpsr & FE_ALL_EXCEPT);
}
static inline int
fedisableexcept(int __mask)
{
fenv_t __newfpsr, __oldfpsr;
__stfpsr(&__oldfpsr);
__newfpsr = __oldfpsr | (__mask & FE_ALL_EXCEPT);
__ldfpsr(__newfpsr);
return (~__oldfpsr & FE_ALL_EXCEPT);
}
static inline int
fegetexcept(void)
{
fenv_t __fpsr;
__stfpsr(&__fpsr);
return (~__fpsr & FE_ALL_EXCEPT);
}
#endif /* __BSD_VISIBLE */
__END_DECLS
#endif /* !_FENV_H_ */
|
