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