Yes. To provide a quick summary, the compiler generates multiple versions of the code, then at runtime does feature detection and picks the best supported imple

Yes. To provide a quick summary, the compiler generates multiple versions of the code, then at runtime does feature detection and picks the best supported implementation. Generally this will only be done for particular functions or blocks that will get a notable benefit from these extra instructions to avoid too much code bloat (unlikely to significantly affect performance but will raise binary size).