It's not designed as an "exciting" architecture, just a boring but free standard architecture. Having said that, you can easily assign two registers as stack p

It's not designed as an "exciting" architecture, just a boring but free standard architecture. Having said that, you can easily assign two registers as stack pointers (instead of the normal one) and decide to use one to save link registers and the other to store stack frames, so you could do this if you wanted (and with many other arches too, definitely Power and Arm would support this, although not x86).