INNER CODE UNIT · C++

rdtsc

StratCraftsAI/NexusFix · benchmarks/constexpr_serializer_bench.cpp:26

inline uint64_t rdtsc() {
    uint64_t lo, hi;
    asm volatile("rdtscp" : "=a"(lo), "=d"(hi) :: "rcx");
    return (hi << 32) | lo;
}

// Get CPU frequency
double get_cpu_freq_ghz() {
    auto start = std::chrono::steady_clock::now();
    uint64_t start_tsc = rdtsc();

    while (std::chrono::steady_clock::now() - start < std::chrono::milliseconds(100)) {
        asm volatile("pause");
    }

    auto end = std::chrono::steady_clock::now();
    uint64_t end_tsc = rdtsc();

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