Comparing the PSP and N3DS is rather meaningless. The PSP had a MiPS CPU (and ME, if you want to consider that), similar to the N64's architecture. The N3DS is running ARM. You'd be better off looking to N64 emulators on the Android for comparison. Even then, there's plenty of other factors that make this improbable. It's not impossible, but I dread thinking about how much work it would probably need.