include/sal/mathconf.h

   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 /*
  21  * This file is part of LibreOffice published API.
  22  */
  23
  24 #ifndef INCLUDED_SAL_MATHCONF_H
  25 #define INCLUDED_SAL_MATHCONF_H
  26
  27 #include "osl/endian.h"
  28
  29 #if defined __sun
  30 #include <ieeefp.h>
  31 #endif /* __sun */
  32
  33 #if defined(__cplusplus) && ( defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L )
  34 #include <cmath>
  35 #endif
  36
  37 #if defined(IOS)
  38 #if defined(__cplusplus)
  39 #include <cmath>
  40 #else
  41 #include <math.h>
  42 #endif
  43 #endif
  44
  45 #if defined __cplusplus
  46 extern "C" {
  47 #endif /* __cplusplus */
  48
  49
  50 /* Generally, the C standard guarantees that at program startup, "trapping or
  51    stopping (if supported) is disabled on all [floating-point] exceptions"
  52    (F.7.3/1 of the August 3, 1998 draft of C99), and that during program
  53    execution, "a programmer can safely assume default modes (or be unaware of
  54    them)" (7.6/2, footnote 161 of the August 3, 1998 draft of C99).  Reportedly,
  55    on Windows there are printer drivers that switch on exceptions.  To avoid
  56    problems, the SAL_MATH_FPEXCEPTIONS_OFF macro can be used to explicitly
  57    switch off exceptions (on Windows).
  58  */
  59 #if defined(_WIN32)
  60 #define SAL_MATH_FPEXCEPTIONS_OFF() _control87( _MCW_EM, _MCW_EM )
  61 #else /* WNT */
  62 #define SAL_MATH_FPEXCEPTIONS_OFF()
  63 #endif /* WNT */
  64
  65
  66 /* SAL_MATH_FINITE(d): test double d on INFINITY, NaN et al. */
  67 #if !defined __sun && !defined ANDROID \
  68                      && defined(__cplusplus) \
  69                      && ( defined(__GXX_EXPERIMENTAL_CXX0X__) \
  70                           || __cplusplus >= 201103L \
  71                           || defined(IOS) )
  72 #define SAL_MATH_FINITE(d) std::isfinite(d)
  73 #elif defined __APPLE__ && !(defined __i386__ || defined __x86_64__)
  74 #define SAL_MATH_FINITE(d) isfinite(d)
  75 #elif defined( WNT)
  76 #define SAL_MATH_FINITE(d) _finite(d)
  77 #elif defined(ANDROID) || defined LINUX || defined UNX
  78 #define SAL_MATH_FINITE(d) finite(d)
  79 #else /* WNT, LINUX, UNX */
  80 #error "SAL_MATH_FINITE not defined"
  81 #endif /* WNT, LINUX, UNX */
  82
  83
  84 /* This needs to be fixed for non--IEEE-754 platforms: */
  85 #if 1 /* IEEE 754 supported */
  86 #if defined OSL_BIGENDIAN
  87
  88 /* IEEE 754 double structures for BigEndian */
  89 union sal_math_Double
  90 {
  91     struct
  92     {
  93         unsigned sign         : 1;
  94         unsigned exponent     :11;
  95         unsigned fraction_hi  :20;
  96         unsigned fraction_lo  :32;
  97     } inf_parts;
  98     struct
  99     {
 100         unsigned sign         : 1;
 101         unsigned exponent     :11;
 102         unsigned qnan_bit     : 1;
 103         unsigned bits         :19;
 104         unsigned fraction_lo  :32;
 105     } nan_parts;
 106     struct
 107     {
 108         unsigned msw          :32;
 109         unsigned lsw          :32;
 110     } w32_parts;
 111     struct
 112     {
 113         sal_uInt64 sign       : 1;
 114         sal_uInt64 exponent   :11;
 115         sal_uInt64 fraction   :52;
 116     } parts;
 117     sal_uInt64 intrep;
 118     double value;
 119 };
 120
 121 #elif defined OSL_LITENDIAN
 122
 123 /* IEEE 754 double structures for LittleEndian */
 124 union sal_math_Double
 125 {
 126     struct {
 127         unsigned fraction_lo  :32;
 128         unsigned fraction_hi  :20;
 129         unsigned exponent     :11;
 130         unsigned sign         : 1;
 131     } inf_parts;
 132     struct {
 133         unsigned fraction_lo  :32;
 134         unsigned bits         :19;
 135         unsigned qnan_bit     : 1;
 136         unsigned exponent     :11;
 137         unsigned sign         : 1;
 138     } nan_parts;
 139     struct
 140     {
 141         unsigned lsw          :32;
 142         unsigned msw          :32;
 143     } w32_parts;
 144     struct
 145     {
 146         sal_uInt64 fraction   :52;
 147         sal_uInt64 exponent   :11;
 148         sal_uInt64 sign       : 1;
 149     } parts;
 150     sal_uInt64 intrep;
 151     double value;
 152 };
 153
 154 #else /* OSL_BIGENDIAN, OSL_LITENDIAN */
 155
 156 #error "neither OSL_BIGENDIAN nor OSL_LITENDIAN"
 157
 158 #endif /* OSL_BIGENDIAN, OSL_LITENDIAN */
 159 #else /* IEEE 754 supported */
 160
 161 #error "don't know how to handle IEEE 754"
 162
 163 #endif /* IEEE 754 supported */
 164
 165
 166 #if defined __cplusplus
 167 }
 168 #endif /* __cplusplus */
 169
 170 #endif /* INCLUDED_SAL_MATHCONF_H */
 171
 172 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */