Chris@102: /*
Chris@102:  * Distributed under the Boost Software License, Version 1.0.
Chris@102:  * (See accompanying file LICENSE_1_0.txt or copy at
Chris@102:  * http://www.boost.org/LICENSE_1_0.txt)
Chris@102:  *
Chris@102:  * Copyright (c) 2010 Helge Bahmann
Chris@102:  * Copyright (c) 2013 Tim Blechmann
Chris@102:  * Copyright (c) 2014 Andrey Semashev
Chris@102:  */
Chris@102: /*!
Chris@102:  * \file   atomic/detail/ops_gcc_sparc.hpp
Chris@102:  *
Chris@102:  * This header contains implementation of the \c operations template.
Chris@102:  */
Chris@102: 
Chris@102: #ifndef BOOST_ATOMIC_DETAIL_OPS_GCC_SPARC_HPP_INCLUDED_
Chris@102: #define BOOST_ATOMIC_DETAIL_OPS_GCC_SPARC_HPP_INCLUDED_
Chris@102: 
Chris@102: #include <boost/memory_order.hpp>
Chris@102: #include <boost/atomic/detail/config.hpp>
Chris@102: #include <boost/atomic/detail/storage_type.hpp>
Chris@102: #include <boost/atomic/detail/operations_fwd.hpp>
Chris@102: #include <boost/atomic/capabilities.hpp>
Chris@102: #include <boost/atomic/detail/ops_cas_based.hpp>
Chris@102: #include <boost/atomic/detail/ops_extending_cas_based.hpp>
Chris@102: 
Chris@102: #ifdef BOOST_HAS_PRAGMA_ONCE
Chris@102: #pragma once
Chris@102: #endif
Chris@102: 
Chris@102: namespace boost {
Chris@102: namespace atomics {
Chris@102: namespace detail {
Chris@102: 
Chris@102: struct gcc_sparc_cas_base
Chris@102: {
Chris@102:     static BOOST_FORCEINLINE void fence_before(memory_order order) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         if (order == memory_order_seq_cst)
Chris@102:             __asm__ __volatile__ ("membar #Sync" ::: "memory");
Chris@102:         else if ((order & memory_order_release) != 0)
Chris@102:             __asm__ __volatile__ ("membar #StoreStore | #LoadStore" ::: "memory");
Chris@102:     }
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE void fence_after(memory_order order) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         if (order == memory_order_seq_cst)
Chris@102:             __asm__ __volatile__ ("membar #Sync" ::: "memory");
Chris@102:         else if ((order & (memory_order_consume | memory_order_acquire)) != 0)
Chris@102:             __asm__ __volatile__ ("membar #StoreStore | #LoadStore" ::: "memory");
Chris@102:     }
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE void fence_after_store(memory_order order) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         if (order == memory_order_seq_cst)
Chris@102:             __asm__ __volatile__ ("membar #Sync" ::: "memory");
Chris@102:     }
Chris@102: };
Chris@102: 
Chris@102: template< bool Signed >
Chris@102: struct gcc_sparc_cas32 :
Chris@102:     public gcc_sparc_cas_base
Chris@102: {
Chris@102:     typedef typename make_storage_type< 4u, Signed >::type storage_type;
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE void store(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         fence_before_store(order);
Chris@102:         storage = v;
Chris@102:         fence_after_store(order);
Chris@102:     }
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE storage_type load(storage_type const volatile& storage, memory_order order) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         storage_type v = storage;
Chris@102:         fence_after(order);
Chris@102:         return v;
Chris@102:     }
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE bool compare_exchange_strong(
Chris@102:         storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order success_order, memory_order failure_order) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         fence_before(success_order);
Chris@102:         storage_type previous = expected;
Chris@102:         __asm__ __volatile__
Chris@102:         (
Chris@102:             "cas [%1], %2, %0"
Chris@102:             : "+r" (desired)
Chris@102:             : "r" (&storage), "r" (previous)
Chris@102:             : "memory"
Chris@102:         );
Chris@102:         const bool success = (desired == previous);
Chris@102:         if (success)
Chris@102:             fence_after(success_order);
Chris@102:         else
Chris@102:             fence_after(failure_order);
Chris@102:         expected = desired;
Chris@102:         return success;
Chris@102:     }
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE bool compare_exchange_weak(
Chris@102:         storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order success_order, memory_order failure_order) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         return compare_exchange_strong(storage, expected, desired, success_order, failure_order);
Chris@102:     }
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE bool is_lock_free(storage_type const volatile&) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         return true;
Chris@102:     }
Chris@102: };
Chris@102: 
Chris@102: template< bool Signed >
Chris@102: struct operations< 4u, Signed > :
Chris@102:     public cas_based_operations< gcc_sparc_cas32< Signed > >
Chris@102: {
Chris@102:     typedef cas_based_operations< gcc_sparc_cas32< Signed > > base_type;
Chris@102:     typedef typename base_type::storage_type storage_type;
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE storage_type exchange(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         base_type::fence_before(order);
Chris@102:         __asm__ __volatile__
Chris@102:         (
Chris@102:             "swap [%1], %0"
Chris@102:             : "+r" (v)
Chris@102:             : "r" (&storage)
Chris@102:             : "memory"
Chris@102:         );
Chris@102:         base_type::fence_after(order);
Chris@102:         return v;
Chris@102:     }
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE bool test_and_set(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         return !!exchange(storage, (storage_type)1, order);
Chris@102:     }
Chris@102: };
Chris@102: 
Chris@102: template< bool Signed >
Chris@102: struct operations< 1u, Signed > :
Chris@102:     public extending_cas_based_operations< operations< 4u, Signed >, 1u, Signed >
Chris@102: {
Chris@102: };
Chris@102: 
Chris@102: template< bool Signed >
Chris@102: struct operations< 2u, Signed > :
Chris@102:     public extending_cas_based_operations< operations< 4u, Signed >, 2u, Signed >
Chris@102: {
Chris@102: };
Chris@102: 
Chris@102: template< bool Signed >
Chris@102: struct gcc_sparc_cas64 :
Chris@102:     public gcc_sparc_cas_base
Chris@102: {
Chris@102:     typedef typename make_storage_type< 8u, Signed >::type storage_type;
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE void store(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         fence_before_store(order);
Chris@102:         storage = v;
Chris@102:         fence_after_store(order);
Chris@102:     }
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE storage_type load(storage_type const volatile& storage, memory_order order) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         storage_type v = storage;
Chris@102:         fence_after(order);
Chris@102:         return v;
Chris@102:     }
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE bool compare_exchange_strong(
Chris@102:         storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order success_order, memory_order failure_order) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         fence_before(success_order);
Chris@102:         storage_type previous = expected;
Chris@102:         __asm__ __volatile__
Chris@102:         (
Chris@102:             "casx [%1], %2, %0"
Chris@102:             : "+r" (desired)
Chris@102:             : "r" (&storage), "r" (previous)
Chris@102:             : "memory"
Chris@102:         );
Chris@102:         const bool success = (desired == previous);
Chris@102:         if (success)
Chris@102:             fence_after(success_order);
Chris@102:         else
Chris@102:             fence_after(failure_order);
Chris@102:         expected = desired;
Chris@102:         return success;
Chris@102:     }
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE bool compare_exchange_weak(
Chris@102:         storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order success_order, memory_order failure_order) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         return compare_exchange_strong(storage, expected, desired, success_order, failure_order);
Chris@102:     }
Chris@102: 
Chris@102:     static BOOST_FORCEINLINE bool is_lock_free(storage_type const volatile&) BOOST_NOEXCEPT
Chris@102:     {
Chris@102:         return true;
Chris@102:     }
Chris@102: };
Chris@102: 
Chris@102: template< bool Signed >
Chris@102: struct operations< 8u, Signed > :
Chris@102:     public cas_based_operations< gcc_sparc_cas64< Signed > >
Chris@102: {
Chris@102: };
Chris@102: 
Chris@102: 
Chris@102: BOOST_FORCEINLINE void thread_fence(memory_order order) BOOST_NOEXCEPT
Chris@102: {
Chris@102:     switch (order)
Chris@102:     {
Chris@102:     case memory_order_release:
Chris@102:         __asm__ __volatile__ ("membar #StoreStore | #LoadStore" ::: "memory");
Chris@102:         break;
Chris@102:     case memory_order_consume:
Chris@102:     case memory_order_acquire:
Chris@102:         __asm__ __volatile__ ("membar #LoadLoad | #LoadStore" ::: "memory");
Chris@102:         break;
Chris@102:     case memory_order_acq_rel:
Chris@102:         __asm__ __volatile__ ("membar #LoadLoad | #LoadStore | #StoreStore" ::: "memory");
Chris@102:         break;
Chris@102:     case memory_order_seq_cst:
Chris@102:         __asm__ __volatile__ ("membar #Sync" ::: "memory");
Chris@102:         break;
Chris@102:     case memory_order_relaxed:
Chris@102:     default:
Chris@102:         break;
Chris@102:     }
Chris@102: }
Chris@102: 
Chris@102: BOOST_FORCEINLINE void signal_fence(memory_order order) BOOST_NOEXCEPT
Chris@102: {
Chris@102:     if (order != memory_order_relaxed)
Chris@102:         __asm__ __volatile__ ("" ::: "memory");
Chris@102: }
Chris@102: 
Chris@102: } // namespace detail
Chris@102: } // namespace atomics
Chris@102: } // namespace boost
Chris@102: 
Chris@102: #endif // BOOST_ATOMIC_DETAIL_OPS_GCC_SPARC_HPP_INCLUDED_