[comex]

V8 has a JIT, which is always going to require work to port to a new architecture. But the new-ish TurboFan backend is supposed to have the architecture-dependent parts relatively well factored out[1], so it's not as hard as it might be.

https://docs.google.com/presentation/d/1_eLlVzcj94_G4r9j9d_L...