Chris@16: //  branch hints
Chris@16: //  Copyright (C) 2007, 2008 Tim Blechmann
Chris@16: //
Chris@16: //  Distributed under the Boost Software License, Version 1.0. (See
Chris@16: //  accompanying file LICENSE_1_0.txt or copy at
Chris@16: //  http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_LOCKFREE_BRANCH_HINTS_HPP_INCLUDED
Chris@16: #define BOOST_LOCKFREE_BRANCH_HINTS_HPP_INCLUDED
Chris@16: 
Chris@16: namespace boost    {
Chris@16: namespace lockfree {
Chris@16: namespace detail   {
Chris@16: /** \brief hint for the branch prediction */
Chris@16: inline bool likely(bool expr)
Chris@16: {
Chris@16: #ifdef __GNUC__
Chris@16:     return __builtin_expect(expr, true);
Chris@16: #else
Chris@16:     return expr;
Chris@16: #endif
Chris@16:     }
Chris@16: 
Chris@16: /** \brief hint for the branch prediction */
Chris@16: inline bool unlikely(bool expr)
Chris@16: {
Chris@16: #ifdef __GNUC__
Chris@16:     return __builtin_expect(expr, false);
Chris@16: #else
Chris@16:     return expr;
Chris@16: #endif
Chris@16: }
Chris@16: 
Chris@16: } /* namespace detail */
Chris@16: } /* namespace lockfree */
Chris@16: } /* namespace boost */
Chris@16: 
Chris@16: #endif /* BOOST_LOCKFREE_BRANCH_HINTS_HPP_INCLUDED */