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| -rw-r--r-- | include/sal/mathconf.h | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/include/sal/mathconf.h b/include/sal/mathconf.h new file mode 100644 index 000000000..687f6e3da --- /dev/null +++ b/include/sal/mathconf.h @@ -0,0 +1,154 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + +#ifndef INCLUDED_SAL_MATHCONF_H +#define INCLUDED_SAL_MATHCONF_H + +#include "osl/endian.h" + +#if defined __sun +#include <ieeefp.h> +#endif /* __sun */ + +#if defined(__cplusplus) && ( defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L ) +#include <cmath> +#endif + +#if defined(IOS) +#if defined(__cplusplus) +#include <cmath> +#else +#include <math.h> +#endif +#endif + +#if defined __cplusplus +extern "C" { +#endif /* __cplusplus */ + + +/* Generally, the C standard guarantees that at program startup, "trapping or + stopping (if supported) is disabled on all [floating-point] exceptions" + (F.7.3/1 of the August 3, 1998 draft of C99), and that during program + execution, "a programmer can safely assume default modes (or be unaware of + them)" (7.6/2, footnote 161 of the August 3, 1998 draft of C99). Reportedly, + on Windows there are printer drivers that switch on exceptions. To avoid + problems, the SAL_MATH_FPEXCEPTIONS_OFF macro can be used to explicitly + switch off exceptions (on Windows). + */ +#if defined(_WIN32) +#define SAL_MATH_FPEXCEPTIONS_OFF() _control87( _MCW_EM, _MCW_EM ) +#else /* WNT */ +#define SAL_MATH_FPEXCEPTIONS_OFF() +#endif /* WNT */ + + +/* SAL_MATH_FINITE(d): test double d on INFINITY, NaN et al. */ +#if !defined __sun && !defined ANDROID \ + && defined(__cplusplus) \ + && ( defined(__GXX_EXPERIMENTAL_CXX0X__) \ + || __cplusplus >= 201103L \ + || defined(IOS) ) +#define SAL_MATH_FINITE(d) std::isfinite(d) +#elif defined( IOS ) +#define SAL_MATH_FINITE(d) isfinite(d) +#elif defined( WNT) +#define SAL_MATH_FINITE(d) _finite(d) +#elif defined(ANDROID) || defined LINUX || defined UNX +#define SAL_MATH_FINITE(d) finite(d) +#else /* WNT, LINUX, UNX */ +#error "SAL_MATH_FINITE not defined" +#endif /* WNT, LINUX, UNX */ + + +/* This needs to be fixed for non--IEEE-754 platforms: */ +#if 1 /* IEEE 754 supported */ +#if defined OSL_BIGENDIAN + +/* IEEE 754 double structures for BigEndian */ +union sal_math_Double +{ + struct + { + unsigned sign : 1; + unsigned exponent :11; + unsigned fraction_hi :20; + unsigned fraction_lo :32; + } inf_parts; + struct + { + unsigned sign : 1; + unsigned exponent :11; + unsigned qnan_bit : 1; + unsigned bits :19; + unsigned fraction_lo :32; + } nan_parts; + struct + { + unsigned msw :32; + unsigned lsw :32; + } w32_parts; + double value; +}; + +#elif defined OSL_LITENDIAN + +/* IEEE 754 double structures for LittleEndian */ +union sal_math_Double +{ + struct { + unsigned fraction_lo :32; + unsigned fraction_hi :20; + unsigned exponent :11; + unsigned sign : 1; + } inf_parts; + struct { + unsigned fraction_lo :32; + unsigned bits :19; + unsigned qnan_bit : 1; + unsigned exponent :11; + unsigned sign : 1; + } nan_parts; + struct + { + unsigned lsw :32; + unsigned msw :32; + } w32_parts; + double value; +}; + +#else /* OSL_BIGENDIAN, OSL_LITENDIAN */ + +#error "neither OSL_BIGENDIAN nor OSL_LITENDIAN" + +#endif /* OSL_BIGENDIAN, OSL_LITENDIAN */ +#else /* IEEE 754 supported */ + +#error "don't know how to handle IEEE 754" + +#endif /* IEEE 754 supported */ + + +#if defined __cplusplus +} +#endif /* __cplusplus */ + +#endif /* INCLUDED_SAL_MATHCONF_H */ + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |