If they used unwind tables for panic, it would be cheaper than a deeply nested stack of mispredicted “if err != nil” branches. But according to https://dr-knz.n

If they used unwind tables for panic, it would be cheaper than a deeply nested stack of mispredicted “if err != nil” branches. But according to https://dr-knz.net/go-calling-convention-x86-64.html https://dr-knz.net/go-calling-convention-x86-64.html they don’t, probably because you can randomly defer stuff anywhere and it isn’t statically scoped.