optimizations by the compiler • Special hardware instructions Common use cases: • Math compute kernels • System Calls • Low-level Runtime Details • Cryptography Outline Go Assembly Primer Problem

interface. That simplifies our code and is most general. 15 // Unfortunately, we need to run on kernels built without IPv6 16 // support too. So probe the kernel to figure it out. 17 // 18 means we want the kernel to pick an appropriate originating local 248 // address. Some Linux kernels cycle blindly through a fixed range of 249 // local ports, regardless of destination port.