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/*
This file is a part of KMC software distributed under GNU GPL 3 licence.
The homepage of the KMC project is http://sun.aei.polsl.pl/kmc
Authors: Sebastian Deorowicz, Agnieszka Debudaj-Grabysz, Marek Kokot
Version: 3.1.1
Date : 2019-05-19
*/
#include "stdafx.h"
#include "cpu_info.h"
#ifdef _MSC_VER
#include <intrin.h>
#endif
#include <vector>
#include <array>
#include <cstring>
#include <bitset>
using std::array;
using std::vector;
using std::string;
using std::bitset;
// This code mostly bases on https://docs.microsoft.com/en-us/cpp/intrinsics/cpuid-cpuidex?view=vs-2017
//TODO: probably I should also check if extensions are enabled in the OS
static struct CpuInfoImpl {
bool sse = false;
bool sse2 = false;
bool sse3 = false;
bool sse4_1 = false;
bool sse4_2 = false;
bool avx = false;
bool avx2 = false;
string vendor, brand;
void cpuid(int *result, int function_id) const
{
#if defined(__x86_64__) || defined(__i386__)
#ifdef _MSC_VER
__cpuidex(result, function_id, 0);
//it seems clang defined __GNUC__ so __clang__ is checked first, althought in fact it seems __GNUC__ code seems to work also for clang
#elif defined(__clang__) //basing on https://clang.llvm.org/doxygen/cpuid_8h_source.html
__asm("xchgq %%rbx,%q1\n"
"cpuid\n"
"xchgq %%rbx,%q1"
:"=a"(result[0]), "=r" (result[1]), "=c"(result[2]), "=d"(result[3])
: "0"(function_id), "c"(0));
#elif defined(__GNUC__) //basing on https://github.com/gcc-mirror/gcc/blob/master/gcc/config/i386/cpuid.h#L187
__asm__("cpuid\n\t"
: "=a" (result[0]), "=b" (result[1]), "=c" (result[2]), "=d" (result[3]) : "0" (function_id), "c"(0));
#endif
#endif
}
CpuInfoImpl()
{
#if defined(__x86_64__) || defined(__i386__)
array<int, 4> cpui = { -1 };
cpuid(cpui.data(), 0);
int nIds_ = cpui[0];
vector<array<int, 4>> data_;
for (int i = 0; i <= nIds_; ++i)
{
cpuid(cpui.data(), i);
data_.push_back(cpui);
}
char _vendor[0x20]{};
memcpy(_vendor, &data_[0][1], sizeof(int));
memcpy(_vendor + 4, &data_[0][3], sizeof(int));
memcpy(_vendor + 8, &data_[0][2], sizeof(int));
vendor = _vendor;
if (nIds_ > 0)
{
std::bitset<32> ECX = data_[1][2];
std::bitset<32> EDX = data_[1][3];
sse = EDX[25];
sse2 = EDX[26];
sse3 = ECX[0];
sse4_1 = ECX[19];
sse4_2 = ECX[20];
avx = ECX[28];
}
if (nIds_ > 6)
{
std::bitset<32> EBX = data_[7][1];
avx2 = EBX[5];
}
#else
sse2=true;
#endif
}
const string& GetVendor() const
{
return vendor;
}
const string& GetBrand()
{
static bool computed = false;
if (computed)
return brand;
array<int, 4> cpui = { -1 };
cpuid(cpui.data(), 0x80000000);
int nExIds_ = cpui[0];
char _brand[0x40];
memset(_brand, 0, sizeof(_brand));
vector<array<int, 4>> extdata_;
for (int i = 0x80000000; i <= nExIds_; ++i)
{
cpuid(cpui.data(), i);
extdata_.push_back(cpui);
}
if ((unsigned int)nExIds_ >= 0x80000004)
{
memcpy(_brand, extdata_[2].data(), sizeof(cpui)); memcpy(_brand, extdata_[2].data(), sizeof(cpui));
memcpy(_brand + 16, extdata_[3].data(), sizeof(cpui)); memcpy(_brand + 16, extdata_[3].data(), sizeof(cpui));
memcpy(_brand + 32, extdata_[4].data(), sizeof(cpui)); memcpy(_brand + 32, extdata_[4].data(), sizeof(cpui));
brand = _brand;
}
computed = true;
return brand;
}
} cpu_info_impl;
const string& CCpuInfo::GetVendor()
{
return cpu_info_impl.GetVendor();
}
const string& CCpuInfo::GetBrand()
{
return cpu_info_impl.GetBrand();
}
bool CCpuInfo::SSE_Enabled() { return cpu_info_impl.sse; }
bool CCpuInfo::SSE2_Enabled() { return cpu_info_impl.sse2; }
bool CCpuInfo::SSE3_Enabled() { return cpu_info_impl.sse3; }
bool CCpuInfo::SSE41_Enabled() { return cpu_info_impl.sse4_1; }
bool CCpuInfo::SSE42_Enabled() { return cpu_info_impl.sse4_2; }
bool CCpuInfo::AVX_Enabled() { return cpu_info_impl.avx; }
bool CCpuInfo::AVX2_Enabled() { return cpu_info_impl.avx2; }
// ***** EOF
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