namespace libtorrent { namespace aux
{
namespace {
// internal
void cpuid(unsigned int info[4], int type)
{
#if TORRENT_HAS_SSE && defined _MSC_VER
__cpuid((int*)info, type);
#elif TORRENT_HAS_SSE && defined __GNUC__
__get_cpuid(type, &info[0], &info[1], &info[2], &info[3]);
#else
// for non-x86 and non-amd64, just return zeroes
std::memset(&info[0], 0, sizeof(unsigned int) * 4);
#endif
}
bool supports_sse42()
{
#if TORRENT_HAS_SSE
unsigned int cpui[4];
cpuid(cpui, 1);
return (cpui[2] & (1 << 20)) != 0;
#else
return false;
#endif
}
bool supports_mmx()
{
#if TORRENT_HAS_SSE
unsigned int cpui[4];
cpuid(cpui, 1);
return (cpui[2] & (1 << 23)) != 0;
#else
return false;
#endif
}
} // anonymous namespace
bool sse42_support = supports_sse42();
bool mmx_support = supports_mmx();
} }
namespace libtorrent { namespace aux
{
namespace {
#if TORRENT_HAS_SSE
// internal
void cpuid(std::uint32_t* info, int type)
{
#if defined _MSC_VER
__cpuid((int*)info, type);
#elif defined __GNUC__
__get_cpuid(type, &info[0], &info[1], &info[2], &info[3]);
#else
TORRENT_UNUSED(type);
// for non-x86 and non-amd64, just return zeroes
std::memset(&info[0], 0, sizeof(std::uint32_t) * 4);
#endif
}
#endif
bool supports_sse42()
{
#if TORRENT_HAS_SSE
std::uint32_t cpui[4] = {0};
cpuid(cpui, 1);
return (cpui[2] & (1 << 20)) != 0;
#else
return false;
#endif
}
bool supports_mmx()
{
#if TORRENT_HAS_SSE
std::uint32_t cpui[4] = {0};
cpuid(cpui, 1);
return (cpui[2] & (1 << 23)) != 0;
#else
return false;
#endif
}
bool supports_arm_neon()
{
#if TORRENT_HAS_ARM_NEON
#if defined __arm__
//return (getauxval(AT_HWCAP) & HWCAP_NEON);
return (getauxval(16) & (1 << 12));
#elif defined __aarch64__
//return (getauxval(AT_HWCAP) & HWCAP_ASIMD);
return (getauxval(16) & (1 << 1));
#endif
#else
return false;
#endif
}
bool supports_arm_crc32c()
{
#if TORRENT_HAS_ARM_CRC32
#if defined TORRENT_FORCE_ARM_CRC32
return true;
#elif defined __arm__
//return (getauxval(AT_HWCAP2) & HWCAP2_CRC32);
return (getauxval(26) & (1 << 4));
#elif defined __aarch64__
//return (getauxval(AT_HWCAP) & HWCAP_CRC32);
return (getauxval(16) & (1 << 7));
#endif
#else
return false;
#endif
}
} // anonymous namespace
bool const sse42_support = supports_sse42();
bool const mmx_support = supports_mmx();
bool const arm_neon_support = supports_arm_neon();
bool const arm_crc32c_support = supports_arm_crc32c();
} }
