160 lines
4.3 KiB
C++
160 lines
4.3 KiB
C++
/*
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Copyright (c) 2014-2018, 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 "libtorrent/aux_/cpuid.hpp"
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#include <cstdint>
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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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#else
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#include <cstring> // for std::memset
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#endif
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#if defined __GLIBC__ && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 16))
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#define TORRENT_HAS_AUXV 1
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#elif defined TORRENT_ANDROID
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#define TORRENT_HAS_AUXV 1
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#else
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#define TORRENT_HAS_AUXV 0
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#endif
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#if TORRENT_HAS_ARM && TORRENT_HAS_AUXV
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#if defined TORRENT_ANDROID
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#include <dlfcn.h>
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namespace {
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unsigned long int helper_getauxval(unsigned long int type)
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{
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using getauxval_t = unsigned long int(*)(unsigned long int);
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getauxval_t pf_getauxval = reinterpret_cast<getauxval_t>(dlsym(RTLD_DEFAULT, "getauxval"));
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if (pf_getauxval == nullptr)
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return 0;
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return pf_getauxval(type);
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}
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}
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#else // TORRENT_ANDROID
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#include <sys/auxv.h>
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#define helper_getauxval getauxval
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#endif
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#endif // TORRENT_HAS_ARM && TORRENT_HAS_AUXV
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namespace libtorrent { namespace aux {
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namespace {
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#if TORRENT_HAS_SSE
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// internal
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void cpuid(std::uint32_t* info, int type)
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{
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#if defined _MSC_VER
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__cpuid((int*)info, type);
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#elif defined __GNUC__
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__get_cpuid(std::uint32_t(type), &info[0], &info[1], &info[2], &info[3]);
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#else
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TORRENT_UNUSED(type);
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// for non-x86 and non-amd64, just return zeroes
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std::memset(&info[0], 0, sizeof(std::uint32_t) * 4);
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#endif
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}
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#endif
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bool supports_sse42()
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{
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#if TORRENT_HAS_SSE
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std::uint32_t cpui[4] = {0};
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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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std::uint32_t cpui[4] = {0};
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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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bool supports_arm_neon()
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{
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#if TORRENT_HAS_ARM_NEON && TORRENT_HAS_AUXV
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#if defined __arm__
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//return (getauxval(AT_HWCAP) & HWCAP_NEON);
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return (helper_getauxval(16) & (1 << 12));
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#elif defined __aarch64__
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//return (getauxval(AT_HWCAP) & HWCAP_ASIMD);
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//return (getauxval(16) & (1 << 1));
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// TODO: enable when aarch64 is really tested
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return false;
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#endif
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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_arm_crc32c()
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{
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#if TORRENT_HAS_ARM_CRC32 && TORRENT_HAS_AUXV
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#if defined TORRENT_FORCE_ARM_CRC32
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return true;
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#elif defined __arm__
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//return (getauxval(AT_HWCAP2) & HWCAP2_CRC32);
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return (helper_getauxval(26) & (1 << 4));
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#elif defined __aarch64__
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//return (getauxval(AT_HWCAP) & HWCAP_CRC32);
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return (helper_getauxval(16) & (1 << 7));
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#endif
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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 const sse42_support = supports_sse42();
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bool const mmx_support = supports_mmx();
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bool const arm_neon_support = supports_arm_neon();
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bool const arm_crc32c_support = supports_arm_crc32c();
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} }
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