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Diffstat (limited to 'src/third_party/boost-1.69.0/boost/atomic/detail/storage_type.hpp')
-rw-r--r-- | src/third_party/boost-1.69.0/boost/atomic/detail/storage_type.hpp | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/src/third_party/boost-1.69.0/boost/atomic/detail/storage_type.hpp b/src/third_party/boost-1.69.0/boost/atomic/detail/storage_type.hpp new file mode 100644 index 00000000000..5d824d3a27e --- /dev/null +++ b/src/third_party/boost-1.69.0/boost/atomic/detail/storage_type.hpp @@ -0,0 +1,207 @@ +/* + * 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) 2009 Helge Bahmann + * Copyright (c) 2012 Tim Blechmann + * Copyright (c) 2013 - 2014 Andrey Semashev + */ +/*! + * \file atomic/detail/storage_type.hpp + * + * This header defines underlying types used as storage + */ + +#ifndef BOOST_ATOMIC_DETAIL_STORAGE_TYPE_HPP_INCLUDED_ +#define BOOST_ATOMIC_DETAIL_STORAGE_TYPE_HPP_INCLUDED_ + +#include <cstddef> +#include <boost/cstdint.hpp> +#include <boost/atomic/detail/config.hpp> +#include <boost/atomic/detail/string_ops.hpp> + +#ifdef BOOST_HAS_PRAGMA_ONCE +#pragma once +#endif + +namespace boost { +namespace atomics { +namespace detail { + +template< typename T > +BOOST_FORCEINLINE void non_atomic_load(T const volatile& from, T& to) BOOST_NOEXCEPT +{ + to = from; +} + +template< std::size_t Size > +struct BOOST_ATOMIC_DETAIL_MAY_ALIAS buffer_storage +{ + BOOST_ALIGNMENT(16) unsigned char data[Size]; + + BOOST_FORCEINLINE bool operator! () const BOOST_NOEXCEPT + { + return (data[0] == 0u && BOOST_ATOMIC_DETAIL_MEMCMP(data, data + 1, Size - 1) == 0); + } + + BOOST_FORCEINLINE bool operator== (buffer_storage const& that) const BOOST_NOEXCEPT + { + return BOOST_ATOMIC_DETAIL_MEMCMP(data, that.data, Size) == 0; + } + + BOOST_FORCEINLINE bool operator!= (buffer_storage const& that) const BOOST_NOEXCEPT + { + return BOOST_ATOMIC_DETAIL_MEMCMP(data, that.data, Size) != 0; + } +}; + +template< std::size_t Size > +BOOST_FORCEINLINE void non_atomic_load(buffer_storage< Size > const volatile& from, buffer_storage< Size >& to) BOOST_NOEXCEPT +{ + BOOST_ATOMIC_DETAIL_MEMCPY(to.data, const_cast< unsigned char const* >(from.data), Size); +} + +template< std::size_t Size > +struct make_storage_type +{ + typedef buffer_storage< Size > type; + + struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned + { + type value; + + BOOST_DEFAULTED_FUNCTION(aligned(), {}) + BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type const& v) BOOST_NOEXCEPT : value(v) {} + }; +}; + +template< > +struct make_storage_type< 1u > +{ + typedef boost::uint8_t BOOST_ATOMIC_DETAIL_MAY_ALIAS type; + + struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned + { + type value; + + BOOST_DEFAULTED_FUNCTION(aligned(), {}) + BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {} + }; +}; + +template< > +struct make_storage_type< 2u > +{ + typedef boost::uint16_t BOOST_ATOMIC_DETAIL_MAY_ALIAS type; + + struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned + { + BOOST_ALIGNMENT(2) type value; + + BOOST_DEFAULTED_FUNCTION(aligned(), {}) + BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {} + }; +}; + +template< > +struct make_storage_type< 4u > +{ + typedef boost::uint32_t BOOST_ATOMIC_DETAIL_MAY_ALIAS type; + + struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned + { + BOOST_ALIGNMENT(4) type value; + + BOOST_DEFAULTED_FUNCTION(aligned(), {}) + BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {} + }; +}; + +template< > +struct make_storage_type< 8u > +{ + typedef boost::uint64_t BOOST_ATOMIC_DETAIL_MAY_ALIAS type; + + struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned + { + BOOST_ALIGNMENT(8) type value; + + BOOST_DEFAULTED_FUNCTION(aligned(), {}) + BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {} + }; +}; + +#if defined(BOOST_HAS_INT128) + +template< > +struct make_storage_type< 16u > +{ + typedef boost::uint128_type BOOST_ATOMIC_DETAIL_MAY_ALIAS type; + + struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned + { + BOOST_ALIGNMENT(16) type value; + + BOOST_DEFAULTED_FUNCTION(aligned(), {}) + BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {} + }; +}; + +#elif !defined(BOOST_NO_ALIGNMENT) + +struct BOOST_ATOMIC_DETAIL_MAY_ALIAS storage128_t +{ + typedef boost::uint64_t BOOST_ATOMIC_DETAIL_MAY_ALIAS element_type; + + element_type data[2]; + + BOOST_FORCEINLINE bool operator! () const BOOST_NOEXCEPT + { + return (data[0] | data[1]) == 0u; + } +}; + +BOOST_FORCEINLINE bool operator== (storage128_t const& left, storage128_t const& right) BOOST_NOEXCEPT +{ + return ((left.data[0] ^ right.data[0]) | (left.data[1] ^ right.data[1])) == 0u; +} +BOOST_FORCEINLINE bool operator!= (storage128_t const& left, storage128_t const& right) BOOST_NOEXCEPT +{ + return !(left == right); +} + +BOOST_FORCEINLINE void non_atomic_load(storage128_t const volatile& from, storage128_t& to) BOOST_NOEXCEPT +{ + to.data[0] = from.data[0]; + to.data[1] = from.data[1]; +} + +template< > +struct make_storage_type< 16u > +{ + typedef storage128_t type; + + struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned + { + BOOST_ALIGNMENT(16) type value; + + BOOST_DEFAULTED_FUNCTION(aligned(), {}) + BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type const& v) BOOST_NOEXCEPT : value(v) {} + }; +}; + +#endif + +template< typename T > +struct storage_size_of +{ + static BOOST_CONSTEXPR_OR_CONST std::size_t size = sizeof(T); + static BOOST_CONSTEXPR_OR_CONST std::size_t value = (size == 3u ? 4u : (size >= 5u && size <= 7u ? 8u : (size >= 9u && size <= 15u ? 16u : size))); +}; + +} // namespace detail +} // namespace atomics +} // namespace boost + +#endif // BOOST_ATOMIC_DETAIL_STORAGE_TYPE_HPP_INCLUDED_ |