Function active_cpu_kernel_name 

pub fn active_cpu_kernel_name() -> &'static str

Name of the active CPU kernel tier (entropy / sequence hot paths) for this process — for diagnostics and benchmark/dashboard reporting. See cpu_kernel::active_cpu_kernel_name. Name of the CPU kernel tier this process selected for the entropy / sequence hot paths: decode (literals + FSE sequence decode) and encode (entropy) share this dispatch (see #247). Returned as a stable lowercase string for diagnostics and benchmark/dashboard reporting; the value is what the runtime CPU-feature detection (or compile-time target_feature on no_std) actually resolves to on this machine, so a dashboard can attribute a measurement to the kernel that produced it.