Addressing Instructions

Question

Are memory to memory instructions allowed?

Eg. ADD [123], [345] or MOV [123], [343]

If not, then why?

Comments

Memory to Memory operations aren't allowed in RISC architecture because it takes significant time for accessing the Main memory(CISC allows it).. while in RISC we only deal with registers while doing arithmetic operations like ADD,SUB etc.. Only during LOAD and STORE MM is accessed..