-/// HT_enabled() returns true if hyper-threading is enabled on current machine
-
-static bool HT_enabled() {
-
- char CPUString[0x20];
- int CPUInfo[4] = {-1};
- int nIds, nLogicalCPU, nCores;
-
- // Detect CPU producer
- __cpuid(CPUInfo, 0);
- nIds = CPUInfo[0];
-
- memset(CPUString, 0, sizeof(CPUString));
- memcpy(&CPUString[0], &CPUInfo[1], sizeof(int));
- memcpy(&CPUString[4], &CPUInfo[3], sizeof(int));
- memcpy(&CPUString[8], &CPUInfo[2], sizeof(int));
-
- // Not an Intel CPU or CPUID.4 not supported
- if (strcmp(CPUString, "GenuineIntel") || nIds < 4)
- return false;
-
- // Detect if HT Technology is supported
- __cpuid(CPUInfo, 1);
- if (!((CPUInfo[3] >> 28) & 1))
- return false;
-
- nLogicalCPU = (CPUInfo[1] >> 16) & 0xFF;
-
- // Detect number of cores
- __cpuid(CPUInfo, 4);
- nCores = 1 + ((CPUInfo[0] >> 26) & 0x3F);
-
- return nLogicalCPU > nCores;
-}
-
-
-/// cpu_count() tries to detect the number of physical CPU cores taking
-/// in account hyper-threading.
-
-int cpu_count() {
-
- return HT_enabled() ? builtin_cpu_count() / 2 : builtin_cpu_count();
-}
-
-