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prefetch.hh
Go to the documentation of this file.
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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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#ifndef EWOMS_PREFETCH_HH
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#define EWOMS_PREFETCH_HH
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namespace
Ewoms {
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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 Ewoms
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#endif
ewoms
common
prefetch.hh
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