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- /*
- * Distributed under the Boost Software License, Version 1.0.
- * (See accompanying file LICENSE_1_0.txt or copy at
- * http://www.boost.org/LICENSE_1_0.txt)
- *
- * Copyright (c) 2018 Andrey Semashev
- */
- /*!
- * \file atomic/detail/float_sizes.hpp
- *
- * This header defines macros for testing buitin floating point type sizes
- */
- #ifndef BOOST_ATOMIC_DETAIL_FLOAT_SIZES_HPP_INCLUDED_
- #define BOOST_ATOMIC_DETAIL_FLOAT_SIZES_HPP_INCLUDED_
- #include <float.h>
- #include <boost/atomic/detail/config.hpp>
- #ifdef BOOST_HAS_PRAGMA_ONCE
- #pragma once
- #endif
- // Detect value sizes of the different floating point types. The value sizes may be less than the corresponding type sizes
- // 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.
- // See: https://en.wikipedia.org/wiki/IEEE_754
- // For Intel x87 extended double see: https://en.wikipedia.org/wiki/Extended_precision#x86_Architecture_Extended_Precision_Format
- // For IBM extended double (a.k.a. double-double) see: https://en.wikipedia.org/wiki/Long_double#Implementations, https://gcc.gnu.org/wiki/Ieee128PowerPC
- #if (FLT_RADIX+0) == 2
- #if ((FLT_MANT_DIG+0) == 11) && ((FLT_MAX_EXP+0) == 16) // IEEE 754 binary16
- #define BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE 2
- #elif ((FLT_MANT_DIG+0) == 24) && ((FLT_MAX_EXP+0) == 128) // IEEE 754 binary32
- #define BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE 4
- #elif ((FLT_MANT_DIG+0) == 53) && ((FLT_MAX_EXP+0) == 1024) // IEEE 754 binary64
- #define BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE 8
- #elif ((FLT_MANT_DIG+0) == 64) && ((FLT_MAX_EXP+0) == 16384) // x87 extended double
- #define BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE 10
- #elif ((FLT_MANT_DIG+0) == 106) && ((FLT_MAX_EXP+0) == 1024) // IBM extended double
- #define BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE 16
- #elif ((FLT_MANT_DIG+0) == 113) && ((FLT_MAX_EXP+0) == 16384) // IEEE 754 binary128
- #define BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE 16
- #elif ((FLT_MANT_DIG+0) == 237) && ((FLT_MAX_EXP+0) == 262144) // IEEE 754 binary256
- #define BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE 32
- #endif
- #if ((DBL_MANT_DIG+0) == 11) && ((DBL_MAX_EXP+0) == 16) // IEEE 754 binary16
- #define BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE 2
- #elif ((DBL_MANT_DIG+0) == 24) && ((DBL_MAX_EXP+0) == 128) // IEEE 754 binary32
- #define BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE 4
- #elif ((DBL_MANT_DIG+0) == 53) && ((DBL_MAX_EXP+0) == 1024) // IEEE 754 binary64
- #define BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE 8
- #elif ((DBL_MANT_DIG+0) == 64) && ((DBL_MAX_EXP+0) == 16384) // x87 extended double
- #define BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE 10
- #elif ((DBL_MANT_DIG+0) == 106) && ((DBL_MAX_EXP+0) == 1024) // IBM extended double
- #define BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE 16
- #elif ((DBL_MANT_DIG+0) == 113) && ((DBL_MAX_EXP+0) == 16384) // IEEE 754 binary128
- #define BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE 16
- #elif ((DBL_MANT_DIG+0) == 237) && ((DBL_MAX_EXP+0) == 262144) // IEEE 754 binary256
- #define BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE 32
- #endif
- #if ((LDBL_MANT_DIG+0) == 11) && ((LDBL_MAX_EXP+0) == 16) // IEEE 754 binary16
- #define BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE 2
- #elif ((LDBL_MANT_DIG+0) == 24) && ((LDBL_MAX_EXP+0) == 128) // IEEE 754 binary32
- #define BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE 4
- #elif ((LDBL_MANT_DIG+0) == 53) && ((LDBL_MAX_EXP+0) == 1024) // IEEE 754 binary64
- #define BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE 8
- #elif ((LDBL_MANT_DIG+0) == 64) && ((LDBL_MAX_EXP+0) == 16384) // x87 extended double
- #define BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE 10
- #elif ((LDBL_MANT_DIG+0) == 106) && ((LDBL_MAX_EXP+0) == 1024) // IBM extended double
- #define BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE 16
- #elif ((LDBL_MANT_DIG+0) == 113) && ((LDBL_MAX_EXP+0) == 16384) // IEEE 754 binary128
- #define BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE 16
- #elif ((LDBL_MANT_DIG+0) == 237) && ((LDBL_MAX_EXP+0) == 262144) // IEEE 754 binary256
- #define BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE 32
- #endif
- #elif (FLT_RADIX+0) == 10
- #if ((FLT_MANT_DIG+0) == 7) && ((FLT_MAX_EXP+0) == 97) // IEEE 754 decimal32
- #define BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE 4
- #elif ((FLT_MANT_DIG+0) == 16) && ((FLT_MAX_EXP+0) == 385) // IEEE 754 decimal64
- #define BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE 8
- #elif ((FLT_MANT_DIG+0) == 34) && ((FLT_MAX_EXP+0) == 6145) // IEEE 754 decimal128
- #define BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE 16
- #endif
- #if ((DBL_MANT_DIG+0) == 7) && ((DBL_MAX_EXP+0) == 97) // IEEE 754 decimal32
- #define BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE 4
- #elif ((DBL_MANT_DIG+0) == 16) && ((DBL_MAX_EXP+0) == 385) // IEEE 754 decimal64
- #define BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE 8
- #elif ((DBL_MANT_DIG+0) == 34) && ((DBL_MAX_EXP+0) == 6145) // IEEE 754 decimal128
- #define BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE 16
- #endif
- #if ((LDBL_MANT_DIG+0) == 7) && ((LDBL_MAX_EXP+0) == 97) // IEEE 754 decimal32
- #define BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE 4
- #elif ((LDBL_MANT_DIG+0) == 16) && ((LDBL_MAX_EXP+0) == 385) // IEEE 754 decimal64
- #define BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE 8
- #elif ((LDBL_MANT_DIG+0) == 34) && ((LDBL_MAX_EXP+0) == 6145) // IEEE 754 decimal128
- #define BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE 16
- #endif
- #endif
- // GCC and compatible compilers define internal macros with builtin type traits
- #if defined(__SIZEOF_FLOAT__)
- #define BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT __SIZEOF_FLOAT__
- #endif
- #if defined(__SIZEOF_DOUBLE__)
- #define BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE __SIZEOF_DOUBLE__
- #endif
- #if defined(__SIZEOF_LONG_DOUBLE__)
- #define BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE __SIZEOF_LONG_DOUBLE__
- #endif
- #if !defined(BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT) || !defined(BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE) || !defined(BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE)
- #define BOOST_ATOMIC_DETAIL_ALIGN_SIZE_TO_POWER_OF_2(x)\
- ((x) == 1u ? 1u : ((x) == 2u ? 2u : ((x) <= 4u ? 4u : ((x) <= 8u ? 8u : ((x) <= 16u ? 16u : ((x) <= 32u ? 32u : (x)))))))
- // 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.
- #if !defined(BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT) && defined(BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE)
- #define BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT BOOST_ATOMIC_DETAIL_ALIGN_SIZE_TO_POWER_OF_2(BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE)
- #endif
- #if !defined(BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE) && defined(BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE)
- #define BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE BOOST_ATOMIC_DETAIL_ALIGN_SIZE_TO_POWER_OF_2(BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE)
- #endif
- #if !defined(BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE) && defined(BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE)
- #define BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE BOOST_ATOMIC_DETAIL_ALIGN_SIZE_TO_POWER_OF_2(BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE)
- #endif
- #endif // !defined(BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT) || !defined(BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE) || !defined(BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE)
- #if !defined(BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT_VALUE) || !defined(BOOST_ATOMIC_DETAIL_SIZEOF_FLOAT) ||\
- !defined(BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE_VALUE) || !defined(BOOST_ATOMIC_DETAIL_SIZEOF_DOUBLE) ||\
- !defined(BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE_VALUE) || !defined(BOOST_ATOMIC_DETAIL_SIZEOF_LONG_DOUBLE)
- #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).
- #endif
- #endif // BOOST_ATOMIC_DETAIL_FLOAT_SIZES_HPP_INCLUDED_
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