934 lines
32 KiB
Plaintext
934 lines
32 KiB
Plaintext
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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) 2009 Helge Bahmann
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* Copyright (c) 2012 Tim Blechmann
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* Copyright (c) 2014 Andrey Semashev
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*/
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/*!
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* \file atomic/detail/ops_msvc_x86.hpp
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*
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* This header contains implementation of the \c operations template.
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*/
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#ifndef BOOST_ATOMIC_DETAIL_OPS_MSVC_X86_HPP_INCLUDED_
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#define BOOST_ATOMIC_DETAIL_OPS_MSVC_X86_HPP_INCLUDED_
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#include <boost/memory_order.hpp>
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#include <boost/type_traits/make_signed.hpp>
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#include <boost/atomic/detail/config.hpp>
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#include <boost/atomic/detail/interlocked.hpp>
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#include <boost/atomic/detail/storage_type.hpp>
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#include <boost/atomic/detail/operations_fwd.hpp>
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#include <boost/atomic/capabilities.hpp>
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#if defined(BOOST_ATOMIC_DETAIL_X86_HAS_CMPXCHG8B) || defined(BOOST_ATOMIC_DETAIL_X86_HAS_CMPXCHG16B)
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#include <boost/cstdint.hpp>
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#include <boost/atomic/detail/ops_cas_based.hpp>
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#endif
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#include <boost/atomic/detail/ops_msvc_common.hpp>
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#if !defined(_M_IX86) && !(defined(BOOST_ATOMIC_INTERLOCKED_COMPARE_EXCHANGE8) && defined(BOOST_ATOMIC_INTERLOCKED_COMPARE_EXCHANGE16))
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#include <boost/atomic/detail/ops_extending_cas_based.hpp>
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#endif
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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_MSVC)
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#pragma warning(push)
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// frame pointer register 'ebx' modified by inline assembly code. See the note below.
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#pragma warning(disable: 4731)
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#endif
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#if defined(BOOST_ATOMIC_DETAIL_X86_HAS_MFENCE)
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extern "C" void _mm_mfence(void);
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#if defined(BOOST_MSVC)
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#pragma intrinsic(_mm_mfence)
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#endif
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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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/*
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* Implementation note for asm blocks.
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*
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* http://msdn.microsoft.com/en-us/data/k1a8ss06%28v=vs.105%29
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*
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* Some SSE types require eight-byte stack alignment, forcing the compiler to emit dynamic stack-alignment code.
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* To be able to access both the local variables and the function parameters after the alignment, the compiler
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* maintains two frame pointers. If the compiler performs frame pointer omission (FPO), it will use EBP and ESP.
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* If the compiler does not perform FPO, it will use EBX and EBP. To ensure code runs correctly, do not modify EBX
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* in asm code if the function requires dynamic stack alignment as it could modify the frame pointer.
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* Either move the eight-byte aligned types out of the function, or avoid using EBX.
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*
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* Since we have no way of knowing that the compiler uses FPO, we have to always save and restore ebx
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* whenever we have to clobber it. Additionally, we disable warning C4731 above so that the compiler
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* doesn't spam about ebx use.
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*/
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struct msvc_x86_operations_base
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{
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static BOOST_CONSTEXPR_OR_CONST bool is_always_lock_free = true;
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static BOOST_FORCEINLINE void hardware_full_fence() BOOST_NOEXCEPT
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{
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#if defined(BOOST_ATOMIC_DETAIL_X86_HAS_MFENCE)
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_mm_mfence();
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#else
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long tmp;
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BOOST_ATOMIC_INTERLOCKED_EXCHANGE(&tmp, 0);
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#endif
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}
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static BOOST_FORCEINLINE void fence_before(memory_order) BOOST_NOEXCEPT
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{
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BOOST_ATOMIC_DETAIL_COMPILER_BARRIER();
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}
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static BOOST_FORCEINLINE void fence_after(memory_order) BOOST_NOEXCEPT
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{
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BOOST_ATOMIC_DETAIL_COMPILER_BARRIER();
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}
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static BOOST_FORCEINLINE void fence_after_load(memory_order) BOOST_NOEXCEPT
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{
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BOOST_ATOMIC_DETAIL_COMPILER_BARRIER();
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// On x86 and x86_64 there is no need for a hardware barrier,
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// even if seq_cst memory order is requested, because all
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// seq_cst writes are implemented with lock-prefixed operations
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// or xchg which has implied lock prefix. Therefore normal loads
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// are already ordered with seq_cst stores on these architectures.
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}
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};
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template< typename T, typename Derived >
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struct msvc_x86_operations :
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public msvc_x86_operations_base
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{
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typedef T storage_type;
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static BOOST_FORCEINLINE void store(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
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{
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if (order != memory_order_seq_cst)
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{
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fence_before(order);
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storage = v;
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fence_after(order);
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}
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else
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{
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Derived::exchange(storage, v, order);
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}
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}
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static BOOST_FORCEINLINE storage_type load(storage_type const volatile& storage, memory_order order) BOOST_NOEXCEPT
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{
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storage_type v = storage;
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fence_after_load(order);
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return v;
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}
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static BOOST_FORCEINLINE storage_type fetch_sub(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
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{
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typedef typename make_signed< storage_type >::type signed_storage_type;
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return Derived::fetch_add(storage, static_cast< storage_type >(-static_cast< signed_storage_type >(v)), order);
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}
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static BOOST_FORCEINLINE bool compare_exchange_weak(
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storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order success_order, memory_order failure_order) BOOST_NOEXCEPT
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{
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return Derived::compare_exchange_strong(storage, expected, desired, success_order, failure_order);
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}
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static BOOST_FORCEINLINE bool test_and_set(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT
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{
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return !!Derived::exchange(storage, (storage_type)1, order);
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}
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static BOOST_FORCEINLINE void clear(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT
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{
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store(storage, (storage_type)0, order);
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}
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static BOOST_FORCEINLINE bool is_lock_free(storage_type const volatile&) BOOST_NOEXCEPT
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{
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return true;
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}
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};
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template< bool Signed >
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struct operations< 4u, Signed > :
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public msvc_x86_operations< typename make_storage_type< 4u, Signed >::type, operations< 4u, Signed > >
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{
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typedef msvc_x86_operations< typename make_storage_type< 4u, Signed >::type, operations< 4u, Signed > > base_type;
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typedef typename base_type::storage_type storage_type;
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typedef typename make_storage_type< 4u, Signed >::aligned aligned_storage_type;
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static BOOST_FORCEINLINE storage_type fetch_add(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
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{
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return static_cast< storage_type >(BOOST_ATOMIC_INTERLOCKED_EXCHANGE_ADD(&storage, v));
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}
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static BOOST_FORCEINLINE storage_type exchange(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
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{
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return static_cast< storage_type >(BOOST_ATOMIC_INTERLOCKED_EXCHANGE(&storage, v));
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}
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static BOOST_FORCEINLINE bool compare_exchange_strong(
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storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order, memory_order) BOOST_NOEXCEPT
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{
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storage_type previous = expected;
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storage_type old_val = static_cast< storage_type >(BOOST_ATOMIC_INTERLOCKED_COMPARE_EXCHANGE(&storage, desired, previous));
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expected = old_val;
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return (previous == old_val);
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}
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#if defined(BOOST_ATOMIC_INTERLOCKED_AND)
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static BOOST_FORCEINLINE storage_type fetch_and(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
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{
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return static_cast< storage_type >(BOOST_ATOMIC_INTERLOCKED_AND(&storage, v));
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}
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#else
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static BOOST_FORCEINLINE storage_type fetch_and(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
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{
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storage_type res = storage;
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while (!compare_exchange_strong(storage, res, res & v, order, memory_order_relaxed)) {}
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return res;
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}
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#endif
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#if defined(BOOST_ATOMIC_INTERLOCKED_OR)
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static BOOST_FORCEINLINE storage_type fetch_or(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
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{
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return static_cast< storage_type >(BOOST_ATOMIC_INTERLOCKED_OR(&storage, v));
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}
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#else
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static BOOST_FORCEINLINE storage_type fetch_or(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
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{
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storage_type res = storage;
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while (!compare_exchange_strong(storage, res, res | v, order, memory_order_relaxed)) {}
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return res;
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}
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#endif
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#if defined(BOOST_ATOMIC_INTERLOCKED_XOR)
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static BOOST_FORCEINLINE storage_type fetch_xor(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
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{
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return static_cast< storage_type >(BOOST_ATOMIC_INTERLOCKED_XOR(&storage, v));
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}
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#else
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static BOOST_FORCEINLINE storage_type fetch_xor(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
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{
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storage_type res = storage;
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while (!compare_exchange_strong(storage, res, res ^ v, order, memory_order_relaxed)) {}
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return res;
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}
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#endif
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};
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#if defined(BOOST_ATOMIC_INTERLOCKED_COMPARE_EXCHANGE8)
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template< bool Signed >
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struct operations< 1u, Signed > :
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public msvc_x86_operations< typename make_storage_type< 1u, Signed >::type, operations< 1u, Signed > >
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{
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typedef msvc_x86_operations< typename make_storage_type< 1u, Signed >::type, operations< 1u, Signed > > base_type;
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typedef typename base_type::storage_type storage_type;
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typedef typename make_storage_type< 1u, Signed >::aligned aligned_storage_type;
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static BOOST_FORCEINLINE storage_type fetch_add(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
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{
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return static_cast< storage_type >(BOOST_ATOMIC_INTERLOCKED_EXCHANGE_ADD8(&storage, v));
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}
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static BOOST_FORCEINLINE storage_type exchange(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
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{
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return static_cast< storage_type >(BOOST_ATOMIC_INTERLOCKED_EXCHANGE8(&storage, v));
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}
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static BOOST_FORCEINLINE bool compare_exchange_strong(
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storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order, memory_order) BOOST_NOEXCEPT
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{
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storage_type previous = expected;
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storage_type old_val = static_cast< storage_type >(BOOST_ATOMIC_INTERLOCKED_COMPARE_EXCHANGE8(&storage, desired, previous));
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expected = old_val;
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return (previous == old_val);
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}
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static BOOST_FORCEINLINE storage_type fetch_and(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
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{
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return static_cast< storage_type >(BOOST_ATOMIC_INTERLOCKED_AND8(&storage, v));
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}
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static BOOST_FORCEINLINE storage_type fetch_or(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
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{
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return static_cast< storage_type >(BOOST_ATOMIC_INTERLOCKED_OR8(&storage, v));
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}
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static BOOST_FORCEINLINE storage_type fetch_xor(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
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{
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return static_cast< storage_type >(BOOST_ATOMIC_INTERLOCKED_XOR8(&storage, v));
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}
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};
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#elif defined(_M_IX86)
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template< bool Signed >
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struct operations< 1u, Signed > :
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public msvc_x86_operations< typename make_storage_type< 1u, Signed >::type, operations< 1u, Signed > >
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{
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typedef msvc_x86_operations< typename make_storage_type< 1u, Signed >::type, operations< 1u, Signed > > base_type;
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typedef typename base_type::storage_type storage_type;
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typedef typename make_storage_type< 1u, Signed >::aligned aligned_storage_type;
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static BOOST_FORCEINLINE storage_type fetch_add(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
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{
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base_type::fence_before(order);
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__asm
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{
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mov edx, storage
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movzx eax, v
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lock xadd byte ptr [edx], al
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mov v, al
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};
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base_type::fence_after(order);
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return v;
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}
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static BOOST_FORCEINLINE storage_type exchange(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
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{
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base_type::fence_before(order);
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__asm
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{
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mov edx, storage
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movzx eax, v
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xchg byte ptr [edx], al
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mov v, al
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};
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base_type::fence_after(order);
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return v;
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}
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static BOOST_FORCEINLINE bool compare_exchange_strong(
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storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order success_order, memory_order) BOOST_NOEXCEPT
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{
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base_type::fence_before(success_order);
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bool success;
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__asm
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{
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mov esi, expected
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mov edi, storage
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movzx eax, byte ptr [esi]
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movzx edx, desired
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lock cmpxchg byte ptr [edi], dl
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mov byte ptr [esi], al
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sete success
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};
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// The success and failure fences are equivalent anyway
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base_type::fence_after(success_order);
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return success;
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}
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static BOOST_FORCEINLINE storage_type fetch_and(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
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{
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base_type::fence_before(order);
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int backup;
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__asm
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{
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mov backup, ebx
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|
|
xor edx, edx
|
||
|
|
mov edi, storage
|
||
|
|
movzx ebx, v
|
||
|
|
movzx eax, byte ptr [edi]
|
||
|
|
align 16
|
||
|
|
again:
|
||
|
|
mov dl, al
|
||
|
|
and dl, bl
|
||
|
|
lock cmpxchg byte ptr [edi], dl
|
||
|
|
jne again
|
||
|
|
mov v, al
|
||
|
|
mov ebx, backup
|
||
|
|
};
|
||
|
|
base_type::fence_after(order);
|
||
|
|
return v;
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE storage_type fetch_or(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
base_type::fence_before(order);
|
||
|
|
int backup;
|
||
|
|
__asm
|
||
|
|
{
|
||
|
|
mov backup, ebx
|
||
|
|
xor edx, edx
|
||
|
|
mov edi, storage
|
||
|
|
movzx ebx, v
|
||
|
|
movzx eax, byte ptr [edi]
|
||
|
|
align 16
|
||
|
|
again:
|
||
|
|
mov dl, al
|
||
|
|
or dl, bl
|
||
|
|
lock cmpxchg byte ptr [edi], dl
|
||
|
|
jne again
|
||
|
|
mov v, al
|
||
|
|
mov ebx, backup
|
||
|
|
};
|
||
|
|
base_type::fence_after(order);
|
||
|
|
return v;
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE storage_type fetch_xor(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
base_type::fence_before(order);
|
||
|
|
int backup;
|
||
|
|
__asm
|
||
|
|
{
|
||
|
|
mov backup, ebx
|
||
|
|
xor edx, edx
|
||
|
|
mov edi, storage
|
||
|
|
movzx ebx, v
|
||
|
|
movzx eax, byte ptr [edi]
|
||
|
|
align 16
|
||
|
|
again:
|
||
|
|
mov dl, al
|
||
|
|
xor dl, bl
|
||
|
|
lock cmpxchg byte ptr [edi], dl
|
||
|
|
jne again
|
||
|
|
mov v, al
|
||
|
|
mov ebx, backup
|
||
|
|
};
|
||
|
|
base_type::fence_after(order);
|
||
|
|
return v;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
#else
|
||
|
|
|
||
|
|
template< bool Signed >
|
||
|
|
struct operations< 1u, Signed > :
|
||
|
|
public extending_cas_based_operations< operations< 4u, Signed >, 1u, Signed >
|
||
|
|
{
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if defined(BOOST_ATOMIC_INTERLOCKED_COMPARE_EXCHANGE16)
|
||
|
|
|
||
|
|
template< bool Signed >
|
||
|
|
struct operations< 2u, Signed > :
|
||
|
|
public msvc_x86_operations< typename make_storage_type< 2u, Signed >::type, operations< 2u, Signed > >
|
||
|
|
{
|
||
|
|
typedef msvc_x86_operations< typename make_storage_type< 2u, Signed >::type, operations< 2u, Signed > > base_type;
|
||
|
|
typedef typename base_type::storage_type storage_type;
|
||
|
|
typedef typename make_storage_type< 2u, Signed >::aligned aligned_storage_type;
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE storage_type fetch_add(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
return static_cast< storage_type >(BOOST_ATOMIC_INTERLOCKED_EXCHANGE_ADD16(&storage, v));
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE storage_type exchange(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
return static_cast< storage_type >(BOOST_ATOMIC_INTERLOCKED_EXCHANGE16(&storage, v));
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE bool compare_exchange_strong(
|
||
|
|
storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order, memory_order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
storage_type previous = expected;
|
||
|
|
storage_type old_val = static_cast< storage_type >(BOOST_ATOMIC_INTERLOCKED_COMPARE_EXCHANGE16(&storage, desired, previous));
|
||
|
|
expected = old_val;
|
||
|
|
return (previous == old_val);
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE storage_type fetch_and(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
return static_cast< storage_type >(BOOST_ATOMIC_INTERLOCKED_AND16(&storage, v));
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE storage_type fetch_or(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
return static_cast< storage_type >(BOOST_ATOMIC_INTERLOCKED_OR16(&storage, v));
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE storage_type fetch_xor(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
return static_cast< storage_type >(BOOST_ATOMIC_INTERLOCKED_XOR16(&storage, v));
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
#elif defined(_M_IX86)
|
||
|
|
|
||
|
|
template< bool Signed >
|
||
|
|
struct operations< 2u, Signed > :
|
||
|
|
public msvc_x86_operations< typename make_storage_type< 2u, Signed >::type, operations< 2u, Signed > >
|
||
|
|
{
|
||
|
|
typedef msvc_x86_operations< typename make_storage_type< 2u, Signed >::type, operations< 2u, Signed > > base_type;
|
||
|
|
typedef typename base_type::storage_type storage_type;
|
||
|
|
typedef typename make_storage_type< 2u, Signed >::aligned aligned_storage_type;
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE storage_type fetch_add(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
base_type::fence_before(order);
|
||
|
|
__asm
|
||
|
|
{
|
||
|
|
mov edx, storage
|
||
|
|
movzx eax, v
|
||
|
|
lock xadd word ptr [edx], ax
|
||
|
|
mov v, ax
|
||
|
|
};
|
||
|
|
base_type::fence_after(order);
|
||
|
|
return v;
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE storage_type exchange(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
base_type::fence_before(order);
|
||
|
|
__asm
|
||
|
|
{
|
||
|
|
mov edx, storage
|
||
|
|
movzx eax, v
|
||
|
|
xchg word ptr [edx], ax
|
||
|
|
mov v, ax
|
||
|
|
};
|
||
|
|
base_type::fence_after(order);
|
||
|
|
return v;
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE bool compare_exchange_strong(
|
||
|
|
storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order success_order, memory_order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
base_type::fence_before(success_order);
|
||
|
|
bool success;
|
||
|
|
__asm
|
||
|
|
{
|
||
|
|
mov esi, expected
|
||
|
|
mov edi, storage
|
||
|
|
movzx eax, word ptr [esi]
|
||
|
|
movzx edx, desired
|
||
|
|
lock cmpxchg word ptr [edi], dx
|
||
|
|
mov word ptr [esi], ax
|
||
|
|
sete success
|
||
|
|
};
|
||
|
|
// The success and failure fences are equivalent anyway
|
||
|
|
base_type::fence_after(success_order);
|
||
|
|
return success;
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE storage_type fetch_and(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
base_type::fence_before(order);
|
||
|
|
int backup;
|
||
|
|
__asm
|
||
|
|
{
|
||
|
|
mov backup, ebx
|
||
|
|
xor edx, edx
|
||
|
|
mov edi, storage
|
||
|
|
movzx ebx, v
|
||
|
|
movzx eax, word ptr [edi]
|
||
|
|
align 16
|
||
|
|
again:
|
||
|
|
mov dx, ax
|
||
|
|
and dx, bx
|
||
|
|
lock cmpxchg word ptr [edi], dx
|
||
|
|
jne again
|
||
|
|
mov v, ax
|
||
|
|
mov ebx, backup
|
||
|
|
};
|
||
|
|
base_type::fence_after(order);
|
||
|
|
return v;
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE storage_type fetch_or(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
base_type::fence_before(order);
|
||
|
|
int backup;
|
||
|
|
__asm
|
||
|
|
{
|
||
|
|
mov backup, ebx
|
||
|
|
xor edx, edx
|
||
|
|
mov edi, storage
|
||
|
|
movzx ebx, v
|
||
|
|
movzx eax, word ptr [edi]
|
||
|
|
align 16
|
||
|
|
again:
|
||
|
|
mov dx, ax
|
||
|
|
or dx, bx
|
||
|
|
lock cmpxchg word ptr [edi], dx
|
||
|
|
jne again
|
||
|
|
mov v, ax
|
||
|
|
mov ebx, backup
|
||
|
|
};
|
||
|
|
base_type::fence_after(order);
|
||
|
|
return v;
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE storage_type fetch_xor(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
base_type::fence_before(order);
|
||
|
|
int backup;
|
||
|
|
__asm
|
||
|
|
{
|
||
|
|
mov backup, ebx
|
||
|
|
xor edx, edx
|
||
|
|
mov edi, storage
|
||
|
|
movzx ebx, v
|
||
|
|
movzx eax, word ptr [edi]
|
||
|
|
align 16
|
||
|
|
again:
|
||
|
|
mov dx, ax
|
||
|
|
xor dx, bx
|
||
|
|
lock cmpxchg word ptr [edi], dx
|
||
|
|
jne again
|
||
|
|
mov v, ax
|
||
|
|
mov ebx, backup
|
||
|
|
};
|
||
|
|
base_type::fence_after(order);
|
||
|
|
return v;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
#else
|
||
|
|
|
||
|
|
template< bool Signed >
|
||
|
|
struct operations< 2u, Signed > :
|
||
|
|
public extending_cas_based_operations< operations< 4u, Signed >, 2u, Signed >
|
||
|
|
{
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
|
||
|
|
#if defined(BOOST_ATOMIC_DETAIL_X86_HAS_CMPXCHG8B)
|
||
|
|
|
||
|
|
template< bool Signed >
|
||
|
|
struct msvc_dcas_x86
|
||
|
|
{
|
||
|
|
typedef typename make_storage_type< 8u, Signed >::type storage_type;
|
||
|
|
typedef typename make_storage_type< 8u, Signed >::aligned aligned_storage_type;
|
||
|
|
|
||
|
|
static BOOST_CONSTEXPR_OR_CONST bool is_always_lock_free = true;
|
||
|
|
|
||
|
|
// Intel 64 and IA-32 Architectures Software Developer's Manual, Volume 3A, 8.1.1. Guaranteed Atomic Operations:
|
||
|
|
//
|
||
|
|
// The Pentium processor (and newer processors since) guarantees that the following additional memory operations will always be carried out atomically:
|
||
|
|
// * Reading or writing a quadword aligned on a 64-bit boundary
|
||
|
|
//
|
||
|
|
// Luckily, the memory is almost always 8-byte aligned in our case because atomic<> uses 64 bit native types for storage and dynamic memory allocations
|
||
|
|
// have at least 8 byte alignment. The only unfortunate case is when atomic is placed on the stack and it is not 8-byte aligned (like on 32 bit Windows).
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE void store(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
BOOST_ATOMIC_DETAIL_COMPILER_BARRIER();
|
||
|
|
|
||
|
|
storage_type volatile* p = &storage;
|
||
|
|
if (((uint32_t)p & 0x00000007) == 0)
|
||
|
|
{
|
||
|
|
#if defined(_M_IX86_FP) && _M_IX86_FP >= 2
|
||
|
|
#if defined(__AVX__)
|
||
|
|
__asm
|
||
|
|
{
|
||
|
|
mov edx, p
|
||
|
|
vmovq xmm4, v
|
||
|
|
vmovq qword ptr [edx], xmm4
|
||
|
|
};
|
||
|
|
#else
|
||
|
|
__asm
|
||
|
|
{
|
||
|
|
mov edx, p
|
||
|
|
movq xmm4, v
|
||
|
|
movq qword ptr [edx], xmm4
|
||
|
|
};
|
||
|
|
#endif
|
||
|
|
#else
|
||
|
|
__asm
|
||
|
|
{
|
||
|
|
mov edx, p
|
||
|
|
fild v
|
||
|
|
fistp qword ptr [edx]
|
||
|
|
};
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
int backup;
|
||
|
|
__asm
|
||
|
|
{
|
||
|
|
mov backup, ebx
|
||
|
|
mov edi, p
|
||
|
|
mov ebx, dword ptr [v]
|
||
|
|
mov ecx, dword ptr [v + 4]
|
||
|
|
mov eax, dword ptr [edi]
|
||
|
|
mov edx, dword ptr [edi + 4]
|
||
|
|
align 16
|
||
|
|
again:
|
||
|
|
lock cmpxchg8b qword ptr [edi]
|
||
|
|
jne again
|
||
|
|
mov ebx, backup
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
BOOST_ATOMIC_DETAIL_COMPILER_BARRIER();
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE storage_type load(storage_type const volatile& storage, memory_order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
BOOST_ATOMIC_DETAIL_COMPILER_BARRIER();
|
||
|
|
|
||
|
|
storage_type const volatile* p = &storage;
|
||
|
|
storage_type value;
|
||
|
|
|
||
|
|
if (((uint32_t)p & 0x00000007) == 0)
|
||
|
|
{
|
||
|
|
#if defined(_M_IX86_FP) && _M_IX86_FP >= 2
|
||
|
|
#if defined(__AVX__)
|
||
|
|
__asm
|
||
|
|
{
|
||
|
|
mov edx, p
|
||
|
|
vmovq xmm4, qword ptr [edx]
|
||
|
|
vmovq value, xmm4
|
||
|
|
};
|
||
|
|
#else
|
||
|
|
__asm
|
||
|
|
{
|
||
|
|
mov edx, p
|
||
|
|
movq xmm4, qword ptr [edx]
|
||
|
|
movq value, xmm4
|
||
|
|
};
|
||
|
|
#endif
|
||
|
|
#else
|
||
|
|
__asm
|
||
|
|
{
|
||
|
|
mov edx, p
|
||
|
|
fild qword ptr [edx]
|
||
|
|
fistp value
|
||
|
|
};
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
// We don't care for comparison result here; the previous value will be stored into value anyway.
|
||
|
|
// Also we don't care for ebx and ecx values, they just have to be equal to eax and edx before cmpxchg8b.
|
||
|
|
__asm
|
||
|
|
{
|
||
|
|
mov edi, p
|
||
|
|
mov eax, ebx
|
||
|
|
mov edx, ecx
|
||
|
|
lock cmpxchg8b qword ptr [edi]
|
||
|
|
mov dword ptr [value], eax
|
||
|
|
mov dword ptr [value + 4], edx
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
BOOST_ATOMIC_DETAIL_COMPILER_BARRIER();
|
||
|
|
|
||
|
|
return value;
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE bool compare_exchange_strong(
|
||
|
|
storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order, memory_order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
// MSVC-11 in 32-bit mode sometimes generates messed up code without compiler barriers,
|
||
|
|
// even though the _InterlockedCompareExchange64 intrinsic already provides one.
|
||
|
|
BOOST_ATOMIC_DETAIL_COMPILER_BARRIER();
|
||
|
|
|
||
|
|
storage_type volatile* p = &storage;
|
||
|
|
#if defined(BOOST_ATOMIC_INTERLOCKED_COMPARE_EXCHANGE64)
|
||
|
|
const storage_type old_val = (storage_type)BOOST_ATOMIC_INTERLOCKED_COMPARE_EXCHANGE64(p, desired, expected);
|
||
|
|
const bool result = (old_val == expected);
|
||
|
|
expected = old_val;
|
||
|
|
#else
|
||
|
|
bool result;
|
||
|
|
int backup;
|
||
|
|
__asm
|
||
|
|
{
|
||
|
|
mov backup, ebx
|
||
|
|
mov edi, p
|
||
|
|
mov esi, expected
|
||
|
|
mov ebx, dword ptr [desired]
|
||
|
|
mov ecx, dword ptr [desired + 4]
|
||
|
|
mov eax, dword ptr [esi]
|
||
|
|
mov edx, dword ptr [esi + 4]
|
||
|
|
lock cmpxchg8b qword ptr [edi]
|
||
|
|
mov dword ptr [esi], eax
|
||
|
|
mov dword ptr [esi + 4], edx
|
||
|
|
mov ebx, backup
|
||
|
|
sete result
|
||
|
|
};
|
||
|
|
#endif
|
||
|
|
BOOST_ATOMIC_DETAIL_COMPILER_BARRIER();
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE bool compare_exchange_weak(
|
||
|
|
storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order success_order, memory_order failure_order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
return compare_exchange_strong(storage, expected, desired, success_order, failure_order);
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE storage_type exchange(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
BOOST_ATOMIC_DETAIL_COMPILER_BARRIER();
|
||
|
|
|
||
|
|
storage_type volatile* p = &storage;
|
||
|
|
int backup;
|
||
|
|
__asm
|
||
|
|
{
|
||
|
|
mov backup, ebx
|
||
|
|
mov edi, p
|
||
|
|
mov ebx, dword ptr [v]
|
||
|
|
mov ecx, dword ptr [v + 4]
|
||
|
|
mov eax, dword ptr [edi]
|
||
|
|
mov edx, dword ptr [edi + 4]
|
||
|
|
align 16
|
||
|
|
again:
|
||
|
|
lock cmpxchg8b qword ptr [edi]
|
||
|
|
jne again
|
||
|
|
mov ebx, backup
|
||
|
|
mov dword ptr [v], eax
|
||
|
|
mov dword ptr [v + 4], edx
|
||
|
|
};
|
||
|
|
|
||
|
|
BOOST_ATOMIC_DETAIL_COMPILER_BARRIER();
|
||
|
|
|
||
|
|
return v;
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE bool is_lock_free(storage_type const volatile&) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
template< bool Signed >
|
||
|
|
struct operations< 8u, Signed > :
|
||
|
|
public cas_based_operations< msvc_dcas_x86< Signed > >
|
||
|
|
{
|
||
|
|
};
|
||
|
|
|
||
|
|
#elif defined(_M_AMD64)
|
||
|
|
|
||
|
|
template< bool Signed >
|
||
|
|
struct operations< 8u, Signed > :
|
||
|
|
public msvc_x86_operations< typename make_storage_type< 8u, Signed >::type, operations< 8u, Signed > >
|
||
|
|
{
|
||
|
|
typedef msvc_x86_operations< typename make_storage_type< 8u, Signed >::type, operations< 8u, Signed > > base_type;
|
||
|
|
typedef typename base_type::storage_type storage_type;
|
||
|
|
typedef typename make_storage_type< 8u, Signed >::aligned aligned_storage_type;
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE storage_type fetch_add(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
return static_cast< storage_type >(BOOST_ATOMIC_INTERLOCKED_EXCHANGE_ADD64(&storage, v));
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE storage_type exchange(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
return static_cast< storage_type >(BOOST_ATOMIC_INTERLOCKED_EXCHANGE64(&storage, v));
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE bool compare_exchange_strong(
|
||
|
|
storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order, memory_order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
storage_type previous = expected;
|
||
|
|
storage_type old_val = static_cast< storage_type >(BOOST_ATOMIC_INTERLOCKED_COMPARE_EXCHANGE64(&storage, desired, previous));
|
||
|
|
expected = old_val;
|
||
|
|
return (previous == old_val);
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE storage_type fetch_and(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
return static_cast< storage_type >(BOOST_ATOMIC_INTERLOCKED_AND64(&storage, v));
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE storage_type fetch_or(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
return static_cast< storage_type >(BOOST_ATOMIC_INTERLOCKED_OR64(&storage, v));
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE storage_type fetch_xor(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
return static_cast< storage_type >(BOOST_ATOMIC_INTERLOCKED_XOR64(&storage, v));
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if defined(BOOST_ATOMIC_DETAIL_X86_HAS_CMPXCHG16B)
|
||
|
|
|
||
|
|
template< bool Signed >
|
||
|
|
struct msvc_dcas_x86_64
|
||
|
|
{
|
||
|
|
typedef typename make_storage_type< 16u, Signed >::type storage_type;
|
||
|
|
typedef typename make_storage_type< 16u, Signed >::aligned aligned_storage_type;
|
||
|
|
|
||
|
|
static BOOST_CONSTEXPR_OR_CONST bool is_always_lock_free = true;
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE void store(storage_type volatile& storage, storage_type v, memory_order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
storage_type value = const_cast< storage_type& >(storage);
|
||
|
|
while (!BOOST_ATOMIC_INTERLOCKED_COMPARE_EXCHANGE128(&storage, v, &value)) {}
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE storage_type load(storage_type const volatile& storage, memory_order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
storage_type value = storage_type();
|
||
|
|
BOOST_ATOMIC_INTERLOCKED_COMPARE_EXCHANGE128(&storage, value, &value);
|
||
|
|
return value;
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE bool compare_exchange_strong(
|
||
|
|
storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order, memory_order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
return !!BOOST_ATOMIC_INTERLOCKED_COMPARE_EXCHANGE128(&storage, desired, &expected);
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE bool compare_exchange_weak(
|
||
|
|
storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order success_order, memory_order failure_order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
return compare_exchange_strong(storage, expected, desired, success_order, failure_order);
|
||
|
|
}
|
||
|
|
|
||
|
|
static BOOST_FORCEINLINE bool is_lock_free(storage_type const volatile&) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
template< bool Signed >
|
||
|
|
struct operations< 16u, Signed > :
|
||
|
|
public cas_based_operations< cas_based_exchange< msvc_dcas_x86_64< Signed > > >
|
||
|
|
{
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif // defined(BOOST_ATOMIC_DETAIL_X86_HAS_CMPXCHG16B)
|
||
|
|
|
||
|
|
BOOST_FORCEINLINE void thread_fence(memory_order order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
BOOST_ATOMIC_DETAIL_COMPILER_BARRIER();
|
||
|
|
if (order == memory_order_seq_cst)
|
||
|
|
msvc_x86_operations_base::hardware_full_fence();
|
||
|
|
BOOST_ATOMIC_DETAIL_COMPILER_BARRIER();
|
||
|
|
}
|
||
|
|
|
||
|
|
BOOST_FORCEINLINE void signal_fence(memory_order order) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
if (order != memory_order_relaxed)
|
||
|
|
BOOST_ATOMIC_DETAIL_COMPILER_BARRIER();
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace detail
|
||
|
|
} // namespace atomics
|
||
|
|
} // namespace boost
|
||
|
|
|
||
|
|
#if defined(BOOST_MSVC)
|
||
|
|
#pragma warning(pop)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif // BOOST_ATOMIC_DETAIL_OPS_MSVC_X86_HPP_INCLUDED_
|