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use super::timestamp::*; #[cfg(asm)] use std::llvm_asm; pub(crate) struct CPUCounter; #[cfg(asm)] #[inline] unsafe fn cpucounter() -> u64 { let (low, high): (u64, u64); llvm_asm!("rdtscp" : "={eax}" (low), "={edx}" (high) : : "ecx"); (high << 32) | low } #[cfg(not(asm))] extern "C" { fn cpucounter() -> u64; } impl CPUCounter { #[inline] pub fn current() -> Timestamp { Timestamp(unsafe { cpucounter() }) } }