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#[cfg(target_arch = "x86")]
#[inline(always)]
pub fn rdtsc_arch() -> u64 {
    unsafe { ::core::arch::x86::_rdtsc() as u64 }
}

#[cfg(target_arch = "x86_64")]
#[inline(always)]
pub fn rdtsc_arch() -> u64 {
    unsafe { ::core::arch::x86_64::_rdtsc() as u64 }
}

#[cfg(not(any(arget_arch = "x86", target_arch = "x86_64")))]
compile_error!("Expected x86 or x86_64 architecture.");

#[cfg(target_arch = "x86")]
pub fn lfence() {
    unsafe { ::core::arch::x86::_mm_lfence() }
}

#[cfg(target_arch = "x86_64")]
pub fn lfence() {
    unsafe { ::core::arch::x86_64::_mm_lfence() }
}

#[cfg(not(any(arget_arch = "x86", target_arch = "x86_64")))]
compile_error!("Expected x86 or x86_64 architecture.");

#[inline(always)]
pub fn rdtsc_precise() -> u64 {
    lfence();
    rdtsc_arch()
}

#[inline(always)]
pub fn calc_tsc_hz() -> u64 {
    // 10MHz
    const ROUNDUP_UNIT: u64 = 10_000_000;
    let start = rdtsc_arch();
    std::thread::sleep(std::time::Duration::from_secs(1));
    let end = rdtsc_arch();

    (((end - start) + (ROUNDUP_UNIT - 1)) / ROUNDUP_UNIT) * ROUNDUP_UNIT
}