39 lines
895 B
C++
39 lines
895 B
C++
// branch hints
|
|
// Copyright (C) 2007, 2008 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_BRANCH_HINTS_HPP_INCLUDED
|
|
#define BOOST_LOCKFREE_BRANCH_HINTS_HPP_INCLUDED
|
|
|
|
namespace boost {
|
|
namespace lockfree {
|
|
namespace detail {
|
|
/** \brief hint for the branch prediction */
|
|
inline bool likely(bool expr)
|
|
{
|
|
#ifdef __GNUC__
|
|
return __builtin_expect(expr, true);
|
|
#else
|
|
return expr;
|
|
#endif
|
|
}
|
|
|
|
/** \brief hint for the branch prediction */
|
|
inline bool unlikely(bool expr)
|
|
{
|
|
#ifdef __GNUC__
|
|
return __builtin_expect(expr, false);
|
|
#else
|
|
return expr;
|
|
#endif
|
|
}
|
|
|
|
} /* namespace detail */
|
|
} /* namespace lockfree */
|
|
} /* namespace boost */
|
|
|
|
#endif /* BOOST_LOCKFREE_BRANCH_HINTS_HPP_INCLUDED */
|