39 lines
895 B
C++
39 lines
895 B
C++
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// branch hints
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// Copyright (C) 2007, 2008 Tim Blechmann
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// 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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#ifndef BOOST_LOCKFREE_BRANCH_HINTS_HPP_INCLUDED
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#define BOOST_LOCKFREE_BRANCH_HINTS_HPP_INCLUDED
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namespace boost {
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namespace lockfree {
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namespace detail {
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/** \brief hint for the branch prediction */
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inline bool likely(bool expr)
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{
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#ifdef __GNUC__
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return __builtin_expect(expr, true);
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#else
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return expr;
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#endif
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}
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/** \brief hint for the branch prediction */
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inline bool unlikely(bool expr)
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{
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#ifdef __GNUC__
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return __builtin_expect(expr, false);
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#else
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return expr;
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#endif
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}
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} /* namespace detail */
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} /* namespace lockfree */
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} /* namespace boost */
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#endif /* BOOST_LOCKFREE_BRANCH_HINTS_HPP_INCLUDED */
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