The & (address) operator and register allocation

[Brian bcase Case]

>On most RISC machines (CRISP is the only exception I can think of, but
>then it doesn't really have registers), taking the address of a local
>variable results in that variable residing in the memory stack rather
>than registers.

Some would say that the Pyramid machines stretch the definition of RISC,
but they have large, windowed register files (512) registers and the
registers have memory addresses.