mirror of
https://github.com/OPM/opm-simulators.git
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55 lines
1.9 KiB
C++
55 lines
1.9 KiB
C++
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// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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// vi: set et ts=4 sw=4 sts=4:
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/*
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This file is part of the Open Porous Media project (OPM).
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OPM is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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OPM is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with OPM. If not, see <http://www.gnu.org/licenses/>.
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Consult the COPYING file in the top-level source directory of this
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module for the precise wording of the license and the list of
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copyright holders.
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*/
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/*!
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* \file
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* \copydoc prefetch
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*/
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#ifndef EWOMS_PREFETCH_HH
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#define EWOMS_PREFETCH_HH
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namespace Opm {
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/*!
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* \brief Template function which emits prefetch instructions for a range of memory
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*
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* This function does not change the semantics of the code, but used correctly it will
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* improve performace because the number of cache misses will be reduced.
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*/
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template <int temporalLocality = 3, int writeOnly = 0, class T = void>
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void prefetch(const T& val, unsigned n = 1)
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{
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#if __clang__ || __GNUC__
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// this value is architecture specific, but a cache line size of 64 bytes seems to be
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// used by all contemporary architectures.
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static const int cacheLineSize = 64;
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const char *beginPtr = reinterpret_cast<const char*>(&val);
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const char *endPtr = reinterpret_cast<const char*>(&val + n);
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for (; beginPtr < endPtr; beginPtr += cacheLineSize)
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__builtin_prefetch(beginPtr, writeOnly, temporalLocality);
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#endif
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}
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} // namespace Opm
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#endif
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