Restore libcpuid support.

src/Cpu.cpp

@@ -22,3 +22,84 @@
  */
 
 
+#include <libcpuid.h>
+#include <math.h>
+#include <string.h>
+
+#include "Cpu.h"
+
+
+char Cpu::m_brand[64]   = { 0 };
+int Cpu::m_flags        = 0;
+int Cpu::m_l2_cache     = 0;
+int Cpu::m_l3_cache     = 0;
+int Cpu::m_sockets      = 1;
+int Cpu::m_totalCores   = 0;
+int Cpu::m_totalThreads = 0;
+
+
+int Cpu::optimalThreadsCount(int algo, bool doubleHash, int maxCpuUsage)
+{
+    if (m_totalThreads == 1) {
+        return 1;
+    }
+
+    int cache = m_l3_cache ? m_l3_cache : m_l2_cache;
+    int count = 0;
+    const int size = (algo ? 1024 : 2048) * (doubleHash ? 2 : 1);
+
+    if (cache) {
+        count = cache / size;
+    }
+    else {
+        count = m_totalThreads / 2;
+    }
+
+    if (count > m_totalThreads) {
+        count = m_totalThreads;
+    }
+
+    if (((float) count / m_totalThreads * 100) > maxCpuUsage) {
+        count = ceil((float) m_totalThreads * (maxCpuUsage / 100.0));
+    }
+
+    return count < 1 ? 1 : count;
+}
+
+
+void Cpu::initCommon()
+{
+    struct cpu_raw_data_t raw = { 0 };
+    struct cpu_id_t data = { 0 };
+
+    cpuid_get_raw_data(&raw);
+    cpu_identify(&raw, &data);
+
+    strncpy(m_brand, data.brand_str, sizeof(m_brand) - 1);
+
+    m_totalThreads = data.total_logical_cpus;
+    m_sockets = m_totalThreads / data.num_logical_cpus;
+    m_totalCores = data.num_cores *m_sockets;
+
+    m_l3_cache = data.l3_cache > 0 ? data.l3_cache * m_sockets : 0;
+
+    // Workaround for AMD CPUs https://github.com/anrieff/libcpuid/issues/97
+    if (data.vendor == VENDOR_AMD && data.l3_cache <= 0 && data.l2_assoc == 16 && data.ext_family >= 21) {
+        m_l2_cache = data.l2_cache * (m_totalCores / 2) * m_sockets;
+    }
+    else {
+        m_l2_cache = data.l2_cache > 0 ? data.l2_cache * m_totalCores * m_sockets : 0;
+    }
+
+#   ifdef __x86_64__
+    m_flags |= X86_64;
+#   endif
+
+    if (data.flags[CPU_FEATURE_AES]) {
+        m_flags |= AES;
+    }
+
+    if (data.flags[CPU_FEATURE_BMI2]) {
+        m_flags |= BMI2;
+    }
+}