The DEC Alpha chip was the same. It also had a hardwired zero register (although IIRC the zero register was r31 instead of r0) and about half the addressing mo

The DEC Alpha chip was the same. It also had a hardwired zero register (although IIRC the zero register was r31 instead of r0) and about half the addressing modes and a whole bunch of "assembly instructions" were created by interesting uses of that zero register.