/*
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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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* (C) Copyright 2013 Tim Blechmann
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* (C) Copyright 2013, 2020 Andrey Semashev
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*/
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#ifndef BOOST_ATOMIC_DETAIL_PAUSE_HPP_INCLUDED_
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#define BOOST_ATOMIC_DETAIL_PAUSE_HPP_INCLUDED_
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#include <boost/atomic/detail/config.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(_MSC_VER)
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#if defined(_M_AMD64) || defined(_M_IX86)
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extern "C" void _mm_pause(void);
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#if defined(BOOST_MSVC)
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#pragma intrinsic(_mm_pause)
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#endif
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#elif defined(_M_ARM64) || defined(_M_ARM)
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extern "C" void __yield(void);
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#if defined(BOOST_MSVC)
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#pragma intrinsic(__yield)
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#endif
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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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BOOST_FORCEINLINE void pause() BOOST_NOEXCEPT
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{
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#if defined(_MSC_VER)
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#if defined(_M_AMD64) || defined(_M_IX86)
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_mm_pause();
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#elif defined(_M_ARM64) || defined(_M_ARM)
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__yield();
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#endif
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#elif defined(__GNUC__)
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#if defined(__i386__) || defined(__x86_64__)
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__asm__ __volatile__("pause;" : : : "memory");
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#elif (defined(__ARM_ARCH) && __ARM_ARCH >= 8) || defined(__ARM_ARCH_8A__) || defined(__aarch64__)
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__asm__ __volatile__("yield;" : : : "memory");
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#endif
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#endif
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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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#include <boost/atomic/detail/footer.hpp>
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#endif // BOOST_ATOMIC_DETAIL_PAUSE_HPP_INCLUDED_
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