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 #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     struct
 108     {
 109         sal_uInt64 sign       : 1;
 110         sal_uInt64 exponent   :11;
 111         sal_uInt64 fraction   :52;
 112     } parts;
 113     sal_uInt64 intrep;
 114     double value;
 115 };
 116
 117 #elif defined OSL_LITENDIAN
 118
 119 /* IEEE 754 double structures for LittleEndian */
 120 union sal_math_Double
 121 {
 122     struct {
 123         unsigned fraction_lo  :32;
 124         unsigned fraction_hi  :20;
 125         unsigned exponent     :11;
 126         unsigned sign         : 1;
 127     } inf_parts;
 128     struct {
 129         unsigned fraction_lo  :32;
 130         unsigned bits         :19;
 131         unsigned qnan_bit     : 1;
 132         unsigned exponent     :11;
 133         unsigned sign         : 1;
 134     } nan_parts;
 135     struct
 136     {
 137         unsigned lsw          :32;
 138         unsigned msw          :32;
 139     } w32_parts;
 140     struct
 141     {
 142         sal_uInt64 fraction   :52;
 143         sal_uInt64 exponent   :11;
 144         sal_uInt64 sign       : 1;
 145     } parts;
 146     sal_uInt64 intrep;
 147     double value;
 148 };
 149
 150 #else /* OSL_BIGENDIAN, OSL_LITENDIAN */
 151
 152 #error "neither OSL_BIGENDIAN nor OSL_LITENDIAN"
 153
 154 #endif /* OSL_BIGENDIAN, OSL_LITENDIAN */
 155 #else /* IEEE 754 supported */
 156
 157 #error "don't know how to handle IEEE 754"
 158
 159 #endif /* IEEE 754 supported */
 160
 161
 162 #if defined __cplusplus
 163 }
 164 #endif /* __cplusplus */
 165
 166 #endif /* INCLUDED_SAL_MATHCONF_H */
 167
 168 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */