`fsrm`: Fast Short REP MOVSB `ermsb`: Enhanced REP MOVSB/STOSB `rust-lang` already appears to include `ermsb` https://github.com/rust-lang/rust/blob/035b01b794602d5861daa43ac792f372f8981ed7/library/std_detect/src/detect/arch/x86.rs#L276
fsrm: Fast Short REP MOVSBermsb: Enhanced REP MOVSB/STOSBrust-langalready appears to includeermsbhttps://github.com/rust-lang/rust/blob/035b01b794602d5861daa43ac792f372f8981ed7/library/std_detect/src/detect/arch/x86.rs#L276