It's also possible that in such a world there is no need for simulating anything since the perfect answers can all be found through quantum computers and looking elsewhere. Why simulate us or the universe? At that point, it's equally likely that there is a creator and/or that we are in a simulation.
The extent to which a simulation can be completely divorced from the abstractions running it, (i.e. quantization and the speed at which things happen) is just asking for more energy, orders of magnitude more, if possible at all in the first place, but I am sure Godel doesn't apply either.