Check architecture version to x86_64 CPU - written on C++

check_cpu_version.cpp

// ref: https://unix.stackexchange.com/questions/631217/how-do-i-check-if-my-cpu-supports-x86-64-v2/631226#631226
// by: Matheus Catarino França
// License: CC0

#include <fstream>
#include <iostream>
#include <string>

int main() {
  std::ifstream cpuinfo("/proc/cpuinfo");
  std::string line;
  int level = 0;

  while (std::getline(cpuinfo, line)) {
    if (line.find("flags") != std::string::npos) {
      while (std::getline(cpuinfo, line)) {
        if (line.find("lm") != std::string::npos &&
            line.find("cmov") != std::string::npos &&
            line.find("cx8") != std::string::npos &&
            line.find("fpu") != std::string::npos &&
            line.find("fxsr") != std::string::npos &&
            line.find("mmx") != std::string::npos &&
            line.find("syscall") != std::string::npos &&
            line.find("sse2") != std::string::npos) {
          level = 1;
        }
        if (level == 1 && line.find("cx16") != std::string::npos &&
            line.find("lahf") != std::string::npos &&
            line.find("popcnt") != std::string::npos &&
            line.find("sse4_1") != std::string::npos &&
            line.find("sse4_2") != std::string::npos &&
            line.find("ssse3") != std::string::npos) {
          level = 2;
        }
        if (level == 2 && line.find("avx") != std::string::npos &&
            line.find("avx2") != std::string::npos &&
            line.find("bmi1") != std::string::npos &&
            line.find("bmi2") != std::string::npos &&
            line.find("f16c") != std::string::npos &&
            line.find("fma") != std::string::npos &&
            line.find("abm") != std::string::npos &&
            line.find("movbe") != std::string::npos &&
            line.find("xsave") != std::string::npos) {
          level = 3;
        }
        if (level == 3 && line.find("avx512f") != std::string::npos &&
            line.find("avx512bw") != std::string::npos &&
            line.find("avx512cd") != std::string::npos &&
            line.find("avx512dq") != std::string::npos &&
            line.find("avx512vl") != std::string::npos) {
          level = 4;
        }
      }
    }
  }

  if (level > 0) {
    std::cout << "CPU supports x86-64-v" << level << std::endl;
  } else {
    std::cout << "CPU does not support required features" << std::endl;
    return 1;
  }
  return 0;
}

cpuid_check.cpp

#include <iostream>
#include <bitset>

int main() {
    // Declare variables to store the result of the CPUID instruction
    unsigned int eax, ebx, ecx, edx;

    // Use inline assembly to execute the CPUID instruction
    __asm__ (
        "cpuid\n\t"
        : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx)
        : "a" (0)
    );

    // Check the value of the ebx, ecx, and edx registers to determine the CPU architecture
    if (ebx == 0x756e6547 && ecx == 0x6c65746e && edx == 0x49656e69) {
        std::cout << "This CPU is an Intel processor." << std::endl;
    } else if (ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65) {
        std::cout << "This CPU is an AMD processor." << std::endl;
    } else {
        std::cout << "Unable to determine CPU architecture." << std::endl;
    }
    return 0;
}