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Post #1544 312
Hacking the Go compiler to efficiently map IPv4 to IPv6

There is no Map() or To6() method for the reverse direction. Such a method is trivial to implement, but Go maintainers have rejected it on the grounds that users should write netip.AddrFrom16(ip.As16()) and let the compiler optimize it. Today, this pattern is eight times slower than a native method. How can we teach the compiler to optimize this sequence?


https://vincent.bernat.ch/en/blog/2026-go-netip-addrto6
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