You are correct about that. But that is still not the same as using a third temporary (visible) register for the swap that may, or may not be available. > But

You are correct about that. But that is still not the same as using a third temporary (visible) register for the swap that may, or may not be available. > But then you might as well use this register directly for the swap. "Saving" a third variable is in every way a false economy.