CPU_id.hpp

Go to the documentation of this file.

#pragma once 
 
#include <cpuid.h>
#include <cstring>
#include <string>
#include <iostream>
 
inline std::string get_cpu_brand() {
    char brand[0x40] = {0};
    unsigned int regs[4] = {0};
    for (int i = 0; i < 3; ++i) {
        __cpuid(0x80000002 + i, regs[0], regs[1], regs[2], regs[3]);
        std::memcpy(brand + i * 16, regs, sizeof(regs));
    }
    return std::string(brand);
}
 
inline size_t detect_optimal_block_size() {
    std::string brand = get_cpu_brand();
 
    if (brand.find("Xeon Phi") != std::string::npos) return 256;   
    if (brand.find("Xeon")     != std::string::npos) return 128;
    if (brand.find("Ryzen")    != std::string::npos) return 96;
    if (brand.find("Apple")    != std::string::npos) return 64;
    if (brand.find("Core(TM)") != std::string::npos) return 128;
    std::cout << "Unknown CPU brand. Defaulting to 64." << std::endl;
    return 64; 
}