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
|
/**************************************************************************
*
* Copyright 2007-2015 VMware, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
/**
* Wrapper for math.h which makes sure we have definitions of all the c99
* functions.
*/
#ifndef _C99_MATH_H_
#define _C99_MATH_H_
#include <math.h>
#include "c99_compat.h"
/* This is to ensure that we get M_PI, etc. definitions */
#if defined(_MSC_VER) && !defined(_USE_MATH_DEFINES)
#error _USE_MATH_DEFINES define required when building with MSVC
#endif
#if !defined(_MSC_VER) && \
__STDC_VERSION__ < 199901L && \
(!defined(_XOPEN_SOURCE) || _XOPEN_SOURCE < 600) && \
!defined(__cplusplus)
static inline long int
lrint(double d)
{
long int rounded = (long int)(d + 0.5);
if (d - floor(d) == 0.5) {
if (rounded % 2 != 0)
rounded += (d > 0) ? -1 : 1;
}
return rounded;
}
static inline long int
lrintf(float f)
{
long int rounded = (long int)(f + 0.5f);
if (f - floorf(f) == 0.5f) {
if (rounded % 2 != 0)
rounded += (f > 0) ? -1 : 1;
}
return rounded;
}
static inline long long int
llrint(double d)
{
long long int rounded = (long long int)(d + 0.5);
if (d - floor(d) == 0.5) {
if (rounded % 2 != 0)
rounded += (d > 0) ? -1 : 1;
}
return rounded;
}
static inline long long int
llrintf(float f)
{
long long int rounded = (long long int)(f + 0.5f);
if (f - floorf(f) == 0.5f) {
if (rounded % 2 != 0)
rounded += (f > 0) ? -1 : 1;
}
return rounded;
}
static inline float
exp2f(float f)
{
return powf(2.0f, f);
}
static inline double
exp2(double d)
{
return pow(2.0, d);
}
#endif /* C99 */
/*
* signbit() is a macro on Linux. Not available on Windows.
*/
#ifndef signbit
#define signbit(x) ((x) < 0.0f)
#endif
#ifndef M_PI
#define M_PI (3.14159265358979323846)
#endif
#ifndef M_E
#define M_E (2.7182818284590452354)
#endif
#ifndef M_LOG2E
#define M_LOG2E (1.4426950408889634074)
#endif
#ifndef FLT_MAX_EXP
#define FLT_MAX_EXP 128
#endif
#if defined(fpclassify)
/* ISO C99 says that fpclassify is a macro. Assume that any implementation
* of fpclassify, whether it's in a C99 compiler or not, will be a macro.
*/
#elif defined(__cplusplus)
/* For C++, fpclassify() should be defined in <cmath> */
#elif defined(_MSC_VER)
/* Not required on VS2013 and above. Oddly, the fpclassify() function
* doesn't exist in such a form on MSVC. This is an implementation using
* slightly different lower-level Windows functions.
*/
#include <float.h>
static inline enum {FP_NAN, FP_INFINITE, FP_ZERO, FP_SUBNORMAL, FP_NORMAL}
fpclassify(double x)
{
switch(_fpclass(x)) {
case _FPCLASS_SNAN: /* signaling NaN */
case _FPCLASS_QNAN: /* quiet NaN */
return FP_NAN;
case _FPCLASS_NINF: /* negative infinity */
case _FPCLASS_PINF: /* positive infinity */
return FP_INFINITE;
case _FPCLASS_NN: /* negative normal */
case _FPCLASS_PN: /* positive normal */
return FP_NORMAL;
case _FPCLASS_ND: /* negative denormalized */
case _FPCLASS_PD: /* positive denormalized */
return FP_SUBNORMAL;
case _FPCLASS_NZ: /* negative zero */
case _FPCLASS_PZ: /* positive zero */
return FP_ZERO;
default:
/* Should never get here; but if we do, this will guarantee
* that the pattern is not treated like a number.
*/
return FP_NAN;
}
}
#else
#error "Need to include or define an fpclassify function"
#endif
/* Since C++11, the following functions are part of the std namespace. Their C
* counteparts should still exist in the global namespace, however cmath
* undefines those functions, which in glibc 2.23, are defined as macros rather
* than functions as in glibc 2.22.
*/
#if __cplusplus >= 201103L && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 23))
#include <cmath>
using std::fpclassify;
using std::isfinite;
using std::isinf;
using std::isnan;
using std::isnormal;
using std::signbit;
using std::isgreater;
using std::isgreaterequal;
using std::isless;
using std::islessequal;
using std::islessgreater;
using std::isunordered;
#endif
#endif /* #define _C99_MATH_H_ */
|
