diff options
Diffstat (limited to 'boost/atomic/detail/float_sizes.hpp')
| -rw-r--r-- | boost/atomic/detail/float_sizes.hpp | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/boost/atomic/detail/float_sizes.hpp b/boost/atomic/detail/float_sizes.hpp new file mode 100644 index 0000000000..4c3a346f15 --- /dev/null +++ b/boost/atomic/detail/float_sizes.hpp @@ -0,0 +1,142 @@ +/* + * 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_ |