mirror of
https://github.com/yuzu-emu/ext-boost.git
synced 2025-01-24 11:51:00 +00:00
108 lines
3.7 KiB
C++
108 lines
3.7 KiB
C++
/*
|
|
* 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/extra_fp_ops_emulated.hpp
|
|
*
|
|
* This header contains emulated (lock-based) implementation of the extra floating point atomic operations.
|
|
*/
|
|
|
|
#ifndef BOOST_ATOMIC_DETAIL_EXTRA_FP_OPS_EMULATED_HPP_INCLUDED_
|
|
#define BOOST_ATOMIC_DETAIL_EXTRA_FP_OPS_EMULATED_HPP_INCLUDED_
|
|
|
|
#include <cstddef>
|
|
#include <boost/memory_order.hpp>
|
|
#include <boost/atomic/detail/config.hpp>
|
|
#include <boost/atomic/detail/bitwise_fp_cast.hpp>
|
|
#include <boost/atomic/detail/extra_fp_operations_fwd.hpp>
|
|
#include <boost/atomic/detail/lockpool.hpp>
|
|
|
|
#ifdef BOOST_HAS_PRAGMA_ONCE
|
|
#pragma once
|
|
#endif
|
|
|
|
namespace boost {
|
|
namespace atomics {
|
|
namespace detail {
|
|
|
|
//! Generic implementation of extra floating point operations
|
|
template< typename Base, typename Value, std::size_t Size >
|
|
struct emulated_extra_fp_operations :
|
|
public Base
|
|
{
|
|
typedef Base base_type;
|
|
typedef typename base_type::storage_type storage_type;
|
|
typedef Value value_type;
|
|
|
|
static BOOST_FORCEINLINE value_type fetch_negate(storage_type volatile& storage, memory_order) BOOST_NOEXCEPT
|
|
{
|
|
storage_type& s = const_cast< storage_type& >(storage);
|
|
lockpool::scoped_lock lock(&storage);
|
|
value_type old_val = atomics::detail::bitwise_fp_cast< value_type >(s);
|
|
value_type new_val = -old_val;
|
|
s = atomics::detail::bitwise_fp_cast< storage_type >(new_val);
|
|
return old_val;
|
|
}
|
|
|
|
static BOOST_FORCEINLINE value_type negate(storage_type volatile& storage, memory_order) BOOST_NOEXCEPT
|
|
{
|
|
storage_type& s = const_cast< storage_type& >(storage);
|
|
lockpool::scoped_lock lock(&storage);
|
|
value_type old_val = atomics::detail::bitwise_fp_cast< value_type >(s);
|
|
value_type new_val = -old_val;
|
|
s = atomics::detail::bitwise_fp_cast< storage_type >(new_val);
|
|
return new_val;
|
|
}
|
|
|
|
static BOOST_FORCEINLINE value_type add(storage_type volatile& storage, value_type v, memory_order) BOOST_NOEXCEPT
|
|
{
|
|
storage_type& s = const_cast< storage_type& >(storage);
|
|
lockpool::scoped_lock lock(&storage);
|
|
value_type old_val = atomics::detail::bitwise_fp_cast< value_type >(s);
|
|
value_type new_val = old_val + v;
|
|
s = atomics::detail::bitwise_fp_cast< storage_type >(new_val);
|
|
return new_val;
|
|
}
|
|
|
|
static BOOST_FORCEINLINE value_type sub(storage_type volatile& storage, value_type v, memory_order) BOOST_NOEXCEPT
|
|
{
|
|
storage_type& s = const_cast< storage_type& >(storage);
|
|
lockpool::scoped_lock lock(&storage);
|
|
value_type old_val = atomics::detail::bitwise_fp_cast< value_type >(s);
|
|
value_type new_val = old_val - v;
|
|
s = atomics::detail::bitwise_fp_cast< storage_type >(new_val);
|
|
return new_val;
|
|
}
|
|
|
|
static BOOST_FORCEINLINE void opaque_negate(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT
|
|
{
|
|
fetch_negate(storage, order);
|
|
}
|
|
|
|
static BOOST_FORCEINLINE void opaque_add(storage_type volatile& storage, value_type v, memory_order order) BOOST_NOEXCEPT
|
|
{
|
|
base_type::fetch_add(storage, v, order);
|
|
}
|
|
|
|
static BOOST_FORCEINLINE void opaque_sub(storage_type volatile& storage, value_type v, memory_order order) BOOST_NOEXCEPT
|
|
{
|
|
base_type::fetch_sub(storage, v, order);
|
|
}
|
|
};
|
|
|
|
template< typename Base, typename Value, std::size_t Size >
|
|
struct extra_fp_operations< Base, Value, Size, false > :
|
|
public emulated_extra_fp_operations< Base, Value, Size >
|
|
{
|
|
};
|
|
|
|
} // namespace detail
|
|
} // namespace atomics
|
|
} // namespace boost
|
|
|
|
#endif // BOOST_ATOMIC_DETAIL_EXTRA_FP_OPS_EMULATED_HPP_INCLUDED_
|