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include/boost/atomic/detail/extra_fp_ops_generic.hpp
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include/boost/atomic/detail/extra_fp_ops_generic.hpp
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/*
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*
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* Copyright (c) 2018-2025 Andrey Semashev
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*/
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/*!
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* \file atomic/detail/extra_fp_ops_generic.hpp
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*
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* This header contains generic implementation of the extra floating point atomic operations.
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*/
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#ifndef BOOST_ATOMIC_DETAIL_EXTRA_FP_OPS_GENERIC_HPP_INCLUDED_
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#define BOOST_ATOMIC_DETAIL_EXTRA_FP_OPS_GENERIC_HPP_INCLUDED_
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#include <cstddef>
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#include <boost/memory_order.hpp>
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#include <boost/atomic/detail/config.hpp>
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#include <boost/atomic/detail/bitwise_fp_cast.hpp>
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#include <boost/atomic/detail/storage_traits.hpp>
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#include <boost/atomic/detail/extra_fp_operations_fwd.hpp>
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#include <boost/atomic/detail/type_traits/is_iec559.hpp>
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#include <boost/atomic/detail/type_traits/is_integral.hpp>
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#include <boost/atomic/detail/header.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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#pragma once
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#endif
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#if defined(BOOST_GCC) && BOOST_GCC >= 60000
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#pragma GCC diagnostic push
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// ignoring attributes on template argument X - this warning is because we need to pass storage_type as a template argument; no problem in this case
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#pragma GCC diagnostic ignored "-Wignored-attributes"
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#endif
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namespace boost {
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namespace atomics {
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namespace detail {
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//! Negate implementation
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template<
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typename Base,
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typename Value,
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std::size_t Size
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#if defined(BOOST_ATOMIC_DETAIL_INT_FP_ENDIAN_MATCH)
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, bool = atomics::detail::is_iec559< Value >::value && atomics::detail::is_integral< typename Base::storage_type >::value
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#endif
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>
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struct extra_fp_negate_generic :
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public Base
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{
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using base_type = Base;
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using storage_type = typename base_type::storage_type;
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using value_type = Value;
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static BOOST_FORCEINLINE value_type fetch_negate(storage_type volatile& storage, memory_order order) noexcept
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{
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storage_type old_storage, new_storage;
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value_type old_val, new_val;
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atomics::detail::non_atomic_load(storage, old_storage);
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do
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{
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old_val = atomics::detail::bitwise_fp_cast< value_type >(old_storage);
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new_val = -old_val;
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new_storage = atomics::detail::bitwise_fp_cast< storage_type >(new_val);
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}
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while (!base_type::compare_exchange_weak(storage, old_storage, new_storage, order, memory_order_relaxed));
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return old_val;
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}
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static BOOST_FORCEINLINE value_type negate(storage_type volatile& storage, memory_order order) noexcept
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{
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storage_type old_storage, new_storage;
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value_type old_val, new_val;
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atomics::detail::non_atomic_load(storage, old_storage);
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do
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{
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old_val = atomics::detail::bitwise_fp_cast< value_type >(old_storage);
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new_val = -old_val;
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new_storage = atomics::detail::bitwise_fp_cast< storage_type >(new_val);
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}
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while (!base_type::compare_exchange_weak(storage, old_storage, new_storage, order, memory_order_relaxed));
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return new_val;
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}
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static BOOST_FORCEINLINE void opaque_negate(storage_type volatile& storage, memory_order order) noexcept
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{
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fetch_negate(storage, order);
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}
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};
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#if defined(BOOST_ATOMIC_DETAIL_INT_FP_ENDIAN_MATCH)
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//! Negate implementation for IEEE 754 / IEC 559 floating point types. We leverage the fact that the sign bit is the most significant bit in the value.
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template< typename Base, typename Value, std::size_t Size >
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struct extra_fp_negate_generic< Base, Value, Size, true > :
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public Base
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{
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using base_type = Base;
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using storage_type = typename base_type::storage_type;
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using value_type = Value;
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//! The mask with only one sign bit set to 1
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static constexpr storage_type sign_mask = static_cast< storage_type >(1u) << (atomics::detail::value_size_of< value_type >::value * 8u - 1u);
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static BOOST_FORCEINLINE value_type fetch_negate(storage_type volatile& storage, memory_order order) noexcept
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{
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return atomics::detail::bitwise_fp_cast< value_type >(base_type::fetch_xor(storage, sign_mask, order));
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}
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static BOOST_FORCEINLINE value_type negate(storage_type volatile& storage, memory_order order) noexcept
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{
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return atomics::detail::bitwise_fp_cast< value_type >(base_type::bitwise_xor(storage, sign_mask, order));
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}
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static BOOST_FORCEINLINE void opaque_negate(storage_type volatile& storage, memory_order order) noexcept
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{
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base_type::opaque_xor(storage, sign_mask, order);
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}
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};
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#endif // defined(BOOST_ATOMIC_DETAIL_INT_FP_ENDIAN_MATCH)
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//! Generic implementation of floating point operations
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template< typename Base, typename Value, std::size_t Size >
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struct extra_fp_operations_generic :
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public extra_fp_negate_generic< Base, Value, Size >
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{
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using base_type = extra_fp_negate_generic< Base, Value, Size >;
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using storage_type = typename base_type::storage_type;
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using value_type = Value;
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static BOOST_FORCEINLINE value_type add(storage_type volatile& storage, value_type v, memory_order order) noexcept
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{
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storage_type old_storage, new_storage;
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value_type old_val, new_val;
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atomics::detail::non_atomic_load(storage, old_storage);
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do
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{
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old_val = atomics::detail::bitwise_fp_cast< value_type >(old_storage);
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new_val = old_val + v;
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new_storage = atomics::detail::bitwise_fp_cast< storage_type >(new_val);
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}
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while (!base_type::compare_exchange_weak(storage, old_storage, new_storage, order, memory_order_relaxed));
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return new_val;
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}
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static BOOST_FORCEINLINE value_type sub(storage_type volatile& storage, value_type v, memory_order order) noexcept
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{
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storage_type old_storage, new_storage;
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value_type old_val, new_val;
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atomics::detail::non_atomic_load(storage, old_storage);
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do
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{
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old_val = atomics::detail::bitwise_fp_cast< value_type >(old_storage);
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new_val = old_val - v;
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new_storage = atomics::detail::bitwise_fp_cast< storage_type >(new_val);
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}
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while (!base_type::compare_exchange_weak(storage, old_storage, new_storage, order, memory_order_relaxed));
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return new_val;
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}
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static BOOST_FORCEINLINE void opaque_add(storage_type volatile& storage, value_type v, memory_order order) noexcept
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{
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base_type::fetch_add(storage, v, order);
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}
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static BOOST_FORCEINLINE void opaque_sub(storage_type volatile& storage, value_type v, memory_order order) noexcept
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{
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base_type::fetch_sub(storage, v, order);
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}
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};
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// Default extra_fp_operations template definition will be used unless specialized for a specific platform
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template< typename Base, typename Value, std::size_t Size >
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struct extra_fp_operations< Base, Value, Size, true > :
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public extra_fp_operations_generic< Base, Value, Size >
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{
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};
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} // namespace detail
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} // namespace atomics
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} // namespace boost
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#if defined(BOOST_GCC) && BOOST_GCC >= 60000
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#pragma GCC diagnostic pop
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#endif
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#include <boost/atomic/detail/footer.hpp>
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#endif // BOOST_ATOMIC_DETAIL_FP_OPS_GENERIC_HPP_INCLUDED_
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