Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

boost/lockfree/detail/prefix.hpp

//  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

/* this file defines the following macros:
   BOOST_LOCKFREE_CACHELINE_BYTES: size of a cache line
   BOOST_LOCKFREE_PTR_COMPRESSION: use tag/pointer compression to utilize parts
                                   of the virtual address space as tag (at least 16bit)
*/

#if defined( __s390__ ) || defined( __s390x__ )
#    define BOOST_LOCKFREE_CACHELINE_BYTES 256
#elif defined( powerpc ) || defined( __powerpc__ ) || defined( __ppc__ )
#    define BOOST_LOCKFREE_CACHELINE_BYTES 128
#else
#    define BOOST_LOCKFREE_CACHELINE_BYTES 64
#endif

#include <boost/predef.h>

#if BOOST_ARCH_X86_64 || ( ( BOOST_ARCH_ARM >= BOOST_VERSION_NUMBER( 8, 0, 0 ) ) && !BOOST_PLAT_ANDROID )
#    define BOOST_LOCKFREE_PTR_COMPRESSION 1
#endif

#endif /* BOOST_LOCKFREE_PREFIX_HPP_INCLUDED */