cpu_counter_clock.hpp

// Copyright Take Vos 2019.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include "os_detect.hpp"
#include <chrono>
#if TT_COMPILER == TT_CC_MSVC
#include <intrin.h>
#elif TT_COMPILER == TT_CC_CLANG
#include <x86intrin.h>
#elif TT_COMPILER == TT_CC_GCC
#include <x86intrin.h>
#endif
 
namespace tt {
 
struct cpu_counter_clock {
    using rep = uint64_t;
    // Technically not nano-seconds, this just a counter.
    using period = std::nano;
    using duration = std::chrono::duration<rep, period>;
    using time_point = std::chrono::time_point<cpu_counter_clock>;
    static const bool is_steady = true;
 
    static cpu_counter_clock::time_point now() noexcept {
        return time_point(duration(__rdtsc()));
    }
};
 
}