1 /* 2 * Distributed under the Boost Software License, Version 1.0. 3 * (See accompanying file LICENSE_1_0.txt or copy at 4 * http://www.boost.org/LICENSE_1_0.txt) 5 * 6 * Copyright (c) 2018 Andrey Semashev 7 */ 8 /*! 9 * \file atomic/detail/float_sizes.hpp 10 * 11 * This header defines macros for testing buitin floating point type sizes 12 */ 13 14 #ifndef BOOST_ATOMIC_DETAIL_FLOAT_SIZES_HPP_INCLUDED_ 15 #define BOOST_ATOMIC_DETAIL_FLOAT_SIZES_HPP_INCLUDED_ 16 17 #include <float.h> 18 #include <boost/atomic/detail/config.hpp> 19 20 #ifdef BOOST_HAS_PRAGMA_ONCE 21 #pragma once 22 #endif 23 24 // Detect value sizes of the different floating point types. The value sizes may be less than the corresponding type sizes 25 // if the type contains padding bits. This is typical e.g. with 80-bit extended float types, which are often represented as 128-bit types. 26 // See: https://en.wikipedia.org/wiki/IEEE_754 27 // For Intel x87 extended double see: https://en.wikipedia.org/wiki/Extended_precision#x86_Architecture_Extended_Precision_Format 28 // For IBM extended double (a.k.a. double-double) see: https://en.wikipedia.org/wiki/Long_double#Implementations, https://gcc.gnu.org/wiki/Ieee128PowerPC 29 #if (FLT_RADIX+0) == 2 30 31 #if ((FLT_MANT_DIG+0) == 11) && ((FLT_MAX_EXP+0) == 16) // IEEE 754 binary16 32 #define BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE 2 33 #elif ((FLT_MANT_DIG+0) == 24) && ((FLT_MAX_EXP+0) == 128) // IEEE 754 binary32 34 #define BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE 4 35 #elif ((FLT_MANT_DIG+0) == 53) && ((FLT_MAX_EXP+0) == 1024) // IEEE 754 binary64 36 #define BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE 8 37 #elif ((FLT_MANT_DIG+0) == 64) && ((FLT_MAX_EXP+0) == 16384) // x87 extended double 38 #define BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE 10 39 #elif ((FLT_MANT_DIG+0) == 106) && ((FLT_MAX_EXP+0) == 1024) // IBM extended double 40 #define BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE 16 41 #elif ((FLT_MANT_DIG+0) == 113) && ((FLT_MAX_EXP+0) == 16384) // IEEE 754 binary128 42 #define BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE 16 43 #elif ((FLT_MANT_DIG+0) == 237) && ((FLT_MAX_EXP+0) == 262144) // IEEE 754 binary256 44 #define BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE 32 45 #endif 46 47 #if ((DBL_MANT_DIG+0) == 11) && ((DBL_MAX_EXP+0) == 16) // IEEE 754 binary16 48 #define BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE 2 49 #elif ((DBL_MANT_DIG+0) == 24) && ((DBL_MAX_EXP+0) == 128) // IEEE 754 binary32 50 #define BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE 4 51 #elif ((DBL_MANT_DIG+0) == 53) && ((DBL_MAX_EXP+0) == 1024) // IEEE 754 binary64 52 #define BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE 8 53 #elif ((DBL_MANT_DIG+0) == 64) && ((DBL_MAX_EXP+0) == 16384) // x87 extended double 54 #define BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE 10 55 #elif ((DBL_MANT_DIG+0) == 106) && ((DBL_MAX_EXP+0) == 1024) // IBM extended double 56 #define BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE 16 57 #elif ((DBL_MANT_DIG+0) == 113) && ((DBL_MAX_EXP+0) == 16384) // IEEE 754 binary128 58 #define BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE 16 59 #elif ((DBL_MANT_DIG+0) == 237) && ((DBL_MAX_EXP+0) == 262144) // IEEE 754 binary256 60 #define BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE 32 61 #endif 62 63 #if ((LDBL_MANT_DIG+0) == 11) && ((LDBL_MAX_EXP+0) == 16) // IEEE 754 binary16 64 #define BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE 2 65 #elif ((LDBL_MANT_DIG+0) == 24) && ((LDBL_MAX_EXP+0) == 128) // IEEE 754 binary32 66 #define BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE 4 67 #elif ((LDBL_MANT_DIG+0) == 53) && ((LDBL_MAX_EXP+0) == 1024) // IEEE 754 binary64 68 #define BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE 8 69 #elif ((LDBL_MANT_DIG+0) == 64) && ((LDBL_MAX_EXP+0) == 16384) // x87 extended double 70 #define BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE 10 71 #elif ((LDBL_MANT_DIG+0) == 106) && ((LDBL_MAX_EXP+0) == 1024) // IBM extended double 72 #define BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE 16 73 #elif ((LDBL_MANT_DIG+0) == 113) && ((LDBL_MAX_EXP+0) == 16384) // IEEE 754 binary128 74 #define BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE 16 75 #elif ((LDBL_MANT_DIG+0) == 237) && ((LDBL_MAX_EXP+0) == 262144) // IEEE 754 binary256 76 #define BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE 32 77 #endif 78 79 #elif (FLT_RADIX+0) == 10 80 81 #if ((FLT_MANT_DIG+0) == 7) && ((FLT_MAX_EXP+0) == 97) // IEEE 754 decimal32 82 #define BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE 4 83 #elif ((FLT_MANT_DIG+0) == 16) && ((FLT_MAX_EXP+0) == 385) // IEEE 754 decimal64 84 #define BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE 8 85 #elif ((FLT_MANT_DIG+0) == 34) && ((FLT_MAX_EXP+0) == 6145) // IEEE 754 decimal128 86 #define BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE 16 87 #endif 88 89 #if ((DBL_MANT_DIG+0) == 7) && ((DBL_MAX_EXP+0) == 97) // IEEE 754 decimal32 90 #define BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE 4 91 #elif ((DBL_MANT_DIG+0) == 16) && ((DBL_MAX_EXP+0) == 385) // IEEE 754 decimal64 92 #define BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE 8 93 #elif ((DBL_MANT_DIG+0) == 34) && ((DBL_MAX_EXP+0) == 6145) // IEEE 754 decimal128 94 #define BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE 16 95 #endif 96 97 #if ((LDBL_MANT_DIG+0) == 7) && ((LDBL_MAX_EXP+0) == 97) // IEEE 754 decimal32 98 #define BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE 4 99 #elif ((LDBL_MANT_DIG+0) == 16) && ((LDBL_MAX_EXP+0) == 385) // IEEE 754 decimal64 100 #define BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE 8 101 #elif ((LDBL_MANT_DIG+0) == 34) && ((LDBL_MAX_EXP+0) == 6145) // IEEE 754 decimal128 102 #define BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE 16 103 #endif 104 105 #endif 106 107 // GCC and compatible compilers define internal macros with builtin type traits 108 #if defined(__SIZEOF_FLOAT__) 109 #define BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT __SIZEOF_FLOAT__ 110 #endif 111 #if defined(__SIZEOF_DOUBLE__) 112 #define BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE __SIZEOF_DOUBLE__ 113 #endif 114 #if defined(__SIZEOF_LONG_DOUBLE__) 115 #define BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE __SIZEOF_LONG_DOUBLE__ 116 #endif 117 118 #if !defined(BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT) || !defined(BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE) || !defined(BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE) 119 120 #define BOOST_ATOMIC_DETAIL_ALIGN_SIZE_TO_POWER_OF_2(x)\ 121 ((x) == 1u ? 1u : ((x) == 2u ? 2u : ((x) <= 4u ? 4u : ((x) <= 8u ? 8u : ((x) <= 16u ? 16u : ((x) <= 32u ? 32u : (x))))))) 122 123 // Make our best guess. These sizes may not be accurate, but they are good enough to estimate the size of the storage required to hold these types. 124 #if !defined(BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT) && defined(BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE) 125 #define BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT BOOST_ATOMIC_DETAIL_ALIGN_SIZE_TO_POWER_OF_2(BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE) 126 #endif 127 #if !defined(BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE) && defined(BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE) 128 #define BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE BOOST_ATOMIC_DETAIL_ALIGN_SIZE_TO_POWER_OF_2(BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE) 129 #endif 130 #if !defined(BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE) && defined(BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE) 131 #define BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE BOOST_ATOMIC_DETAIL_ALIGN_SIZE_TO_POWER_OF_2(BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE) 132 #endif 133 134 #endif // !defined(BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT) || !defined(BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE) || !defined(BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE) 135 136 #if !defined(BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE) || !defined(BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT) ||\ 137 !defined(BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE) || !defined(BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE) ||\ 138 !defined(BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE) || !defined(BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE) 139 #error Boost.Atomic: Failed to determine builtin floating point type sizes, the target platform is not supported. Please, report to the developers (patches are welcome). 140 #endif 141 142 #endif // BOOST_ATOMIC_DETAIL_FLOAT_SIZES_HPP_INCLUDED_ 143