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)
6 * Copyright (c) 2009 Helge Bahmann
7 * Copyright (c) 2012 Tim Blechmann
8 * Copyright (c) 2013 - 2014 Andrey Semashev
11 * \file atomic/detail/storage_type.hpp
13 * This header defines underlying types used as storage
16 #ifndef BOOST_ATOMIC_DETAIL_STORAGE_TYPE_HPP_INCLUDED_
17 #define BOOST_ATOMIC_DETAIL_STORAGE_TYPE_HPP_INCLUDED_
20 #include <boost/cstdint.hpp>
21 #include <boost/atomic/detail/config.hpp>
22 #if !defined(BOOST_ATOMIC_DETAIL_HAS_BUILTIN_MEMCMP) || !defined(BOOST_ATOMIC_DETAIL_HAS_BUILTIN_MEMCPY)
26 #ifdef BOOST_HAS_PRAGMA_ONCE
34 template< typename T >
35 BOOST_FORCEINLINE void non_atomic_load(T const volatile& from, T& to) BOOST_NOEXCEPT
40 template< std::size_t Size >
41 struct BOOST_ATOMIC_DETAIL_MAY_ALIAS buffer_storage
43 BOOST_ALIGNMENT(16) unsigned char data[Size];
45 BOOST_FORCEINLINE bool operator! () const BOOST_NOEXCEPT
47 return (data[0] == 0u && BOOST_ATOMIC_DETAIL_MEMCMP(data, data + 1, Size - 1) == 0);
50 BOOST_FORCEINLINE bool operator== (buffer_storage const& that) const BOOST_NOEXCEPT
52 return BOOST_ATOMIC_DETAIL_MEMCMP(data, that.data, Size) == 0;
55 BOOST_FORCEINLINE bool operator!= (buffer_storage const& that) const BOOST_NOEXCEPT
57 return BOOST_ATOMIC_DETAIL_MEMCMP(data, that.data, Size) != 0;
61 template< std::size_t Size >
62 BOOST_FORCEINLINE void non_atomic_load(buffer_storage< Size > const volatile& from, buffer_storage< Size >& to) BOOST_NOEXCEPT
64 BOOST_ATOMIC_DETAIL_MEMCPY(to.data, const_cast< unsigned char const* >(from.data), Size);
67 template< std::size_t Size, bool Signed >
68 struct make_storage_type
70 typedef buffer_storage< Size > type;
72 struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned
76 BOOST_DEFAULTED_FUNCTION(aligned(), {})
77 BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type const& v) BOOST_NOEXCEPT : value(v) {}
82 struct make_storage_type< 1u, false >
84 typedef boost::uint8_t BOOST_ATOMIC_DETAIL_MAY_ALIAS type;
86 struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned
90 BOOST_DEFAULTED_FUNCTION(aligned(), {})
91 BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {}
96 struct make_storage_type< 1u, true >
98 typedef boost::int8_t BOOST_ATOMIC_DETAIL_MAY_ALIAS type;
100 struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned
104 BOOST_DEFAULTED_FUNCTION(aligned(), {})
105 BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {}
110 struct make_storage_type< 2u, false >
112 typedef boost::uint16_t BOOST_ATOMIC_DETAIL_MAY_ALIAS type;
114 struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned
116 BOOST_ALIGNMENT(2) type value;
118 BOOST_DEFAULTED_FUNCTION(aligned(), {})
119 BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {}
124 struct make_storage_type< 2u, true >
126 typedef boost::int16_t BOOST_ATOMIC_DETAIL_MAY_ALIAS type;
128 struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned
130 BOOST_ALIGNMENT(2) type value;
132 BOOST_DEFAULTED_FUNCTION(aligned(), {})
133 BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {}
138 struct make_storage_type< 4u, false >
140 typedef boost::uint32_t BOOST_ATOMIC_DETAIL_MAY_ALIAS type;
142 struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned
144 BOOST_ALIGNMENT(4) type value;
146 BOOST_DEFAULTED_FUNCTION(aligned(), {})
147 BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {}
152 struct make_storage_type< 4u, true >
154 typedef boost::int32_t BOOST_ATOMIC_DETAIL_MAY_ALIAS type;
156 struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned
158 BOOST_ALIGNMENT(4) type value;
160 BOOST_DEFAULTED_FUNCTION(aligned(), {})
161 BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {}
166 struct make_storage_type< 8u, false >
168 typedef boost::uint64_t BOOST_ATOMIC_DETAIL_MAY_ALIAS type;
170 struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned
172 BOOST_ALIGNMENT(8) type value;
174 BOOST_DEFAULTED_FUNCTION(aligned(), {})
175 BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {}
180 struct make_storage_type< 8u, true >
182 typedef boost::int64_t BOOST_ATOMIC_DETAIL_MAY_ALIAS type;
184 struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned
186 BOOST_ALIGNMENT(8) type value;
188 BOOST_DEFAULTED_FUNCTION(aligned(), {})
189 BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {}
193 #if defined(BOOST_HAS_INT128)
196 struct make_storage_type< 16u, false >
198 typedef boost::uint128_type BOOST_ATOMIC_DETAIL_MAY_ALIAS type;
200 struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned
202 BOOST_ALIGNMENT(16) type value;
204 BOOST_DEFAULTED_FUNCTION(aligned(), {})
205 BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {}
210 struct make_storage_type< 16u, true >
212 typedef boost::int128_type BOOST_ATOMIC_DETAIL_MAY_ALIAS type;
214 struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned
216 BOOST_ALIGNMENT(16) type value;
218 BOOST_DEFAULTED_FUNCTION(aligned(), {})
219 BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {}
223 #elif !defined(BOOST_NO_ALIGNMENT)
225 struct BOOST_ATOMIC_DETAIL_MAY_ALIAS storage128_t
227 typedef boost::uint64_t BOOST_ATOMIC_DETAIL_MAY_ALIAS element_type;
229 element_type data[2];
231 BOOST_FORCEINLINE bool operator! () const BOOST_NOEXCEPT
233 return data[0] == 0 && data[1] == 0;
237 BOOST_FORCEINLINE bool operator== (storage128_t const& left, storage128_t const& right) BOOST_NOEXCEPT
239 return left.data[0] == right.data[0] && left.data[1] == right.data[1];
241 BOOST_FORCEINLINE bool operator!= (storage128_t const& left, storage128_t const& right) BOOST_NOEXCEPT
243 return !(left == right);
246 BOOST_FORCEINLINE void non_atomic_load(storage128_t const volatile& from, storage128_t& to) BOOST_NOEXCEPT
248 to.data[0] = from.data[0];
249 to.data[1] = from.data[1];
252 template< bool Signed >
253 struct make_storage_type< 16u, Signed >
255 typedef storage128_t type;
257 struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned
259 BOOST_ALIGNMENT(16) type value;
261 BOOST_DEFAULTED_FUNCTION(aligned(), {})
262 BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type const& v) BOOST_NOEXCEPT : value(v) {}
268 template< typename T >
269 struct storage_size_of
274 value = (size == 3 ? 4 : (size >= 5 && size <= 7 ? 8 : (size >= 9 && size <= 15 ? 16 : size)))
278 } // namespace detail
279 } // namespace atomics
282 #endif // BOOST_ATOMIC_DETAIL_STORAGE_TYPE_HPP_INCLUDED_