#include <x86intrin.h>
#include <bits/stdc++.h>

//#include <cstdint>
//#include <array>
//#include <iostream>
//#include <chrono>
//#include <thread>
//#include <unistd.h>

using namespace std;

// $ vc6-7: cat /proc/cpuinfo | egrep -E -i "hz|processor"
// processor	: 0
// cpu MHz		: 2849.824
// processor	: 1
// cpu MHz		: 2849.824
// processor	: 2
// cpu MHz		: 2849.824
// processor	: 3
// cpu MHz		: 2849.824
// model name	: AMD EPYC 7443P 24-Core Processor

uint64_t x = 0;
double y;

int main(void)
{
    uint64_t t1, t2, t3;
    size_t num_loops_millis = 1E6;
    size_t num_loops_micros = 1E3;
    //size_t num_ms = 2;
    //size_t num_us = 700;
    
    //std::array<long long unsigned int, 100> a_ms, a_us;
    //std::array<double, 100> d_ms, d_us;

    // millis
    t1 = __rdtsc();
    for (size_t i = 0; i < num_loops_millis; i++)
    {        
        //std::this_thread::sleep_for(std::chrono::milliseconds(num_ms));
        //usleep(num_ms * 1000);
        x += 1;
        y = log(x);
    }

    t2 = __rdtsc();
    
    // micros
    for (size_t i = 0; i < num_loops_micros; i++)
    {
        //std::this_thread::sleep_for(std::chrono::microseconds(num_us));
        //usleep(num_us);
        x += 1;
        y = log(x);
    }
    t3 = __rdtsc();

    // divide the difference between two RDTSC readings by the CPU's
    // clock frequency (in Hz).
    
    double diff_msec = (t2 - t1) / (2849.824 * 1E6) * 1E3;

    double diff_usec = (t3 - t2) / (2849.824 * 1E6) * 1E6;

    cout << "       t2: " << t2 << endl;
    cout << "       t1: " << t1 << endl;    
    cout << "  t2 - t1: " << t2 - t1 << endl;
    cout << "diff_msec: " << diff_msec << endl;

    cout << "       t3: " << t3 << endl;
    cout << "       t2: " << t2 << endl;    
    cout << "  t3 - t2: " << t3 - t2 << endl;
    cout << "diff_usec: " << diff_usec << endl;
    
    return 0;
}