kala 2.0.0

Timing with nanosecond precision on multiple architectures.
Documentation 
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use crate::time::Instant;
use std::sync::atomic;

#[allow(unused, reason = "used on architectures with no HW support")]
pub fn is_hw_supported() -> bool {
  false
}

#[inline(always)]
pub fn clock_fence() {
  atomic::fence(atomic::Ordering::SeqCst);
}

#[inline(always)]
pub fn now() -> Instant {
  Instant::Std(std::time::Instant::now())
}

#[allow(unused, reason = "must exist on architectures with no HW support")]
pub fn tick_frequency() -> u64 {
  unimplemented!("ticks are not used in the fallback path")
}