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// Copyright (C) 2009, 2016 Tim Blechmann
//
// 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)
#ifndef BOOST_LOCKFREE_PREFIX_HPP_INCLUDED
#define BOOST_LOCKFREE_PREFIX_HPP_INCLUDED
#include <boost/predef.h>
/* this file defines the following macros:
BOOST_LOCKFREE_PTR_COMPRESSION: use tag/pointer compression to utilize parts
of the virtual address space as tag (at least 16bit)
*/
namespace boost { namespace lockfree { namespace detail {
#ifdef __cpp_inline_variables
# define inline_constexpr inline
#else
# define inline_constexpr
#endif
#if BOOST_ARCH_SYS390
inline_constexpr constexpr size_t cacheline_bytes = 256;
#elif BOOST_ARCH_PPC
inline_constexpr constexpr size_t cacheline_bytes = 128;
#elif BOOST_ARCH_ARM && ( BOOST_OS_MACOS || BOOST_OS_IOS )
// technically this is for apple's the M chips, but the A chip are probably similar
inline_constexpr constexpr size_t cacheline_bytes = 128;
#else
inline_constexpr constexpr size_t cacheline_bytes = 64;
#endif
}}} // namespace boost::lockfree::detail
#if BOOST_ARCH_X86_64 || ( ( BOOST_ARCH_ARM >= BOOST_VERSION_NUMBER( 8, 0, 0 ) ) && !BOOST_PLAT_ANDROID )
# define BOOST_LOCKFREE_PTR_COMPRESSION 1
#endif
#undef inline_constexpr
#endif /* BOOST_LOCKFREE_PREFIX_HPP_INCLUDED */
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