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mathconf.h
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 /*
3 * This file is part of the LibreOffice project.
4 *
5 * This Source Code Form is subject to the terms of the Mozilla Public
6 * License, v. 2.0. If a copy of the MPL was not distributed with this
7 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 *
9 * This file incorporates work covered by the following license notice:
10 *
11 * Licensed to the Apache Software Foundation (ASF) under one or more
12 * contributor license agreements. See the NOTICE file distributed
13 * with this work for additional information regarding copyright
14 * ownership. The ASF licenses this file to you under the Apache
15 * License, Version 2.0 (the "License"); you may not use this file
16 * except in compliance with the License. You may obtain a copy of
17 * the License at http://www.apache.org/licenses/LICENSE-2.0 .
18 */
19
20 #ifndef INCLUDED_SAL_MATHCONF_H
21 #define INCLUDED_SAL_MATHCONF_H
22
23 #include "osl/endian.h"
24
25 #if defined __sun
26 #include <ieeefp.h>
27 #endif /* __sun */
28
29 #if defined(__cplusplus) && ( defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L )
30 #include <cmath>
31 #endif
32
33 #if defined(IOS)
34 #if defined(__cplusplus)
35 #include <cmath>
36 #else
37 #include <math.h>
38 #endif
39 #endif
40
41 #if defined __cplusplus
42 extern "C" {
43 #endif /* __cplusplus */
44
45
46 /* Generally, the C standard guarantees that at program startup, "trapping or
47 stopping (if supported) is disabled on all [floating-point] exceptions"
48 (F.7.3/1 of the August 3, 1998 draft of C99), and that during program
49 execution, "a programmer can safely assume default modes (or be unaware of
50 them)" (7.6/2, footnote 161 of the August 3, 1998 draft of C99). Reportedly,
51 on Windows there are printer drivers that switch on exceptions. To avoid
52 problems, the SAL_MATH_FPEXCEPTIONS_OFF macro can be used to explicitly
53 switch off exceptions (on Windows).
54 */
55 #if defined(_WIN32)
56 #define SAL_MATH_FPEXCEPTIONS_OFF() _control87( _MCW_EM, _MCW_EM )
57 #else /* WNT */
58 #define SAL_MATH_FPEXCEPTIONS_OFF()
59 #endif /* WNT */
60
61
62 /* SAL_MATH_FINITE(d): test double d on INFINITY, NaN et al. */
63 #if !defined __sun && !defined ANDROID \
64 && defined(__cplusplus) \
65 && ( defined(__GXX_EXPERIMENTAL_CXX0X__) \
66 || __cplusplus >= 201103L \
67 || defined(IOS) )
68 #define SAL_MATH_FINITE(d) std::isfinite(d)
69 #elif defined( IOS )
70 #define SAL_MATH_FINITE(d) isfinite(d)
71 #elif defined( WNT)
72 #define SAL_MATH_FINITE(d) _finite(d)
73 #elif defined(ANDROID) || defined LINUX || defined UNX
74 #define SAL_MATH_FINITE(d) finite(d)
75 #else /* WNT, LINUX, UNX */
76 #error "SAL_MATH_FINITE not defined"
77 #endif /* WNT, LINUX, UNX */
78
79
80 /* This needs to be fixed for non--IEEE-754 platforms: */
81 #if 1 /* IEEE 754 supported */
82 #if defined OSL_BIGENDIAN
83
84 /* IEEE 754 double structures for BigEndian */
85 union sal_math_Double
86 {
87 struct
88 {
89 unsigned sign : 1;
90 unsigned exponent :11;
91 unsigned fraction_hi :20;
92 unsigned fraction_lo :32;
93 } inf_parts;
94 struct
95 {
96 unsigned sign : 1;
97 unsigned exponent :11;
98 unsigned qnan_bit : 1;
99 unsigned bits :19;
100 unsigned fraction_lo :32;
101 } nan_parts;
102 struct
103 {
104 unsigned msw :32;
105 unsigned lsw :32;
106 } w32_parts;
107 double value;
108 };
109
110 #elif defined OSL_LITENDIAN
111
112 /* IEEE 754 double structures for LittleEndian */
113 union sal_math_Double
114 {
115 struct {
116 unsigned fraction_lo :32;
117 unsigned fraction_hi :20;
118 unsigned exponent :11;
119 unsigned sign : 1;
120 } inf_parts;
121 struct {
122 unsigned fraction_lo :32;
123 unsigned bits :19;
124 unsigned qnan_bit : 1;
125 unsigned exponent :11;
126 unsigned sign : 1;
127 } nan_parts;
128 struct
129 {
130 unsigned lsw :32;
131 unsigned msw :32;
132 } w32_parts;
133 double value;
134 };
135
136 #else /* OSL_BIGENDIAN, OSL_LITENDIAN */
137
138 #error "neither OSL_BIGENDIAN nor OSL_LITENDIAN"
139
140 #endif /* OSL_BIGENDIAN, OSL_LITENDIAN */
141 #else /* IEEE 754 supported */
142
143 #error "don't know how to handle IEEE 754"
144
145 #endif /* IEEE 754 supported */
146
147
148 #if defined __cplusplus
149 }
150 #endif /* __cplusplus */
151
152 #endif /* INCLUDED_SAL_MATHCONF_H */
153
154 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
math.h
endian.h