94 lines
2.5 KiB
C++
94 lines
2.5 KiB
C++
/*
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Copyright (c) 2014-2016, Arvid Norberg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "libtorrent/config.hpp"
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#include <cstring>
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#include "libtorrent/aux_/cpuid.hpp"
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#if defined _MSC_VER && TORRENT_HAS_SSE
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#include <intrin.h>
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#include <nmmintrin.h>
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#endif
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#if TORRENT_HAS_SSE && defined __GNUC__
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#include <cpuid.h>
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#endif
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namespace libtorrent { namespace aux
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{
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namespace {
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// internal
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void cpuid(unsigned int info[4], int type)
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{
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#if TORRENT_HAS_SSE && defined _MSC_VER
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__cpuid((int*)info, type);
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#elif TORRENT_HAS_SSE && defined __GNUC__
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__get_cpuid(type, &info[0], &info[1], &info[2], &info[3]);
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#else
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// for non-x86 and non-amd64, just return zeroes
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std::memset(&info[0], 0, sizeof(unsigned int) * 4);
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#endif
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}
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bool supports_sse42()
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{
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#if TORRENT_HAS_SSE
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unsigned int cpui[4];
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cpuid(cpui, 1);
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return (cpui[2] & (1 << 20)) != 0;
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#else
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return false;
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#endif
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}
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bool supports_mmx()
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{
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#if TORRENT_HAS_SSE
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unsigned int cpui[4];
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cpuid(cpui, 1);
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return (cpui[2] & (1 << 23)) != 0;
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#else
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return false;
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#endif
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}
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} // anonymous namespace
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bool sse42_support = supports_sse42();
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bool mmx_support = supports_mmx();
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} }
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