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#include <cstdint>
#include <cstring>
#include <cstdio>
#include <cstdlib>
#include "cpuid.h"
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
// See http://msdn.microsoft.com/en-us/library/windows/desktop/ms683194(v=vs.85).aspx
typedef BOOL (WINAPI *LPFN_GLPI)(PSYSTEM_LOGICAL_PROCESSOR_INFORMATION, PDWORD);
// Helper function to count set bits in the processor mask.
int countBitsSet(ULONG_PTR bitMask)
{
int result = 0;
while (bitMask != 0) {
result += (int)(bitMask & 1);
bitMask >>= 1;
}
return result;
}
bool getProcessorInfoFromOS(int& cpus, int& cores, int& logicalCores, double& clockSpeed)
{
cpus = 0;
cores = 0;
logicalCores = 0;
clockSpeed = 0;
// Clock speed
HKEY hKey;
if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, TEXT("HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0"), 0, KEY_EXECUTE, &hKey) == ERROR_SUCCESS) {
DWORD type = REG_DWORD;
DWORD val;
DWORD cbData = sizeof(val);
if (RegQueryValueEx(hKey, TEXT("~MHz"), NULL, &type, (LPBYTE)&val, &cbData) == ERROR_SUCCESS) {
if (type == REG_DWORD && cbData == sizeof(DWORD)) {
clockSpeed = val / 1000.0;
}
}
}
if (clockSpeed == 0) {
// Can't access registry, try QueryPerformanceFrequency (nearly always same speed as CPU)
LARGE_INTEGER f;
if (!QueryPerformanceFrequency(&f)) {
return false;
}
clockSpeed = f.QuadPart / 1000.0 / 1000.0;
}
// Everything else
LPFN_GLPI glpi;
glpi = (LPFN_GLPI)GetProcAddress(GetModuleHandle(TEXT("kernel32")), "GetLogicalProcessorInformation");
if (glpi == NULL) {
return false;
}
PSYSTEM_LOGICAL_PROCESSOR_INFORMATION buffer = NULL;
DWORD bufferLength = 0;
if (glpi(buffer, &bufferLength) == TRUE) {
return false;
}
while (GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
if (buffer != NULL) {
std::free(buffer);
}
buffer = (PSYSTEM_LOGICAL_PROCESSOR_INFORMATION)std::malloc(bufferLength);
if (buffer == NULL) {
return false;
}
if (glpi(buffer, &bufferLength) == TRUE) {
if (bufferLength / sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION) * sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION) != bufferLength) {
// sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION) must have changed (different from at compile time)
std::free(buffer);
return false;
}
auto end = (PSYSTEM_LOGICAL_PROCESSOR_INFORMATION)((char*)buffer + bufferLength);
for (auto ptr = buffer; ptr != end; ++ptr) {
switch (ptr->Relationship) {
case RelationProcessorCore:
++cores;
logicalCores += countBitsSet(ptr->ProcessorMask);
break;
case RelationProcessorPackage:
++cpus;
break;
default:
break;
}
}
std::free(buffer);
return true;
}
}
if (buffer != NULL) {
std::free(buffer);
}
return false;
}
#else
// TODO
bool getProcessorInfoFromOS(int& cpus, int& cores, int& logicalCores, double& clockSpeed)
{
return false;
}
#endif
#if defined(__x86_64__) || defined(_M_AMD64) || defined(__amd64__) || defined (_M_X64) || defined(_M_IX86) || defined(__i386__)
#define MOODYCAMEL_X86_OR_X64
#endif
#ifdef MOODYCAMEL_X86_OR_X64
struct CPUIDInfo
{
std::uint32_t data[4];
};
#ifdef _MSC_VER
#include <intrin.h>
inline CPUIDInfo cpuid(std::uint32_t eax)
{
CPUIDInfo info;
__cpuidex((int*)&info.data[0], eax, 0);
return info;
}
#else
// Assume GCC-compatible inline assembly syntax
inline CPUIDInfo cpuid(std::uint32_t eax)
{
CPUIDInfo info;
asm volatile("cpuid"
: "=a" (info.data[0]), "=b" (info.data[1]), "=c" (info.data[2]), "=d" (info.data[3])
: "a" (eax), "c" (0));
return info;
}
#endif
#endif // MOODYCAMEL_X86_OR_X64
namespace moodycamel
{
const char* getCPUString()
{
// TODO: Support non-x86/-x64 architectures
#ifdef MOODYCAMEL_X86_OR_X64
static char buf[128] = { 0 };
if (buf[0] != 0) {
return buf;
}
CPUIDInfo info = cpuid(0x80000000);
std::uint32_t ex = info.data[0];
for (std::uint32_t i = 0; i + 0x80000002 <= ex && i != 3; ++i) {
*(reinterpret_cast<CPUIDInfo*>(buf) + i) = cpuid(i + 0x80000002);
}
if (buf[0] == 0) {
strcpy(buf, UNKNOWN_CPU_STRING);
return buf;
}
info = cpuid(0);
if (info.data[0] < 1) {
// cpuid(1) not supported
return buf;
}
// Add number of CPUs, cores, HT, and GHz
info = cpuid(1);
bool ht = ((info.data[3] >> 28) & 1) == 1; // Note: This is also 1 on most multi-core systems, even if there's no HT
int cpus, cores, logicalCores;
double clockSpeed;
if (!getProcessorInfoFromOS(cpus, cores, logicalCores, clockSpeed)) {
return buf;
}
// Strip @ nGHz if any, since we re-calculate this ourselves
int atIndex;
for (atIndex = (int)std::strlen(buf) - 1; atIndex != -1; --atIndex) {
if (buf[atIndex] == '@') {
if (atIndex > 0 && buf[atIndex - 1] == ' ') {
--atIndex;
}
buf[atIndex] = '\0';
break;
}
}
// Strip trailing spaces if any
for (char* s = buf + std::strlen(buf); s != buf && s[-1] == ' '; --s)
s[-1] = '\0';
char* str = buf + std::strlen(buf);
if (cpus > 1) {
// Assume identical CPUs
logicalCores /= cpus;
cores /= cpus;
std::sprintf(str, " x%d", cpus);
str += strlen(str);
}
ht = ht && logicalCores != cores;
std::sprintf(str, " with %d core%s%s @ %.1fGHz%s", cores, cores == 1 ? "" : "s", ht ? " (HyperThreaded)" : "", clockSpeed, cpus > 1 ? " each" : "");
return buf;
#else
return UNKNOWN_CPU_STRING;
#endif
}
}
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