[wahern]

It'll be even faster without indirecting through dispatch_table at runtime. Exporting your label addresses without introducing a conditional initialization block is tricky but doable. For C++ you can (IIRC) smuggle dispatch_table out of the routine using a constructor on a statically-scoped object. For C code I've successfully used GCC's nested function and __attribute__((constructor, used)) extensions, though that was with 4.7 (may not work with current GCC).

I mostly use computed gotos for implementing poor-man's coroutines in C, where the addresses only need to be visible within the routine. For VMs I use the obvious method (i.e. dispatch_table) to keep the code sane, but it does incur a non-negligible performance cost, which may matter in some contexts.