0 votes 0 votes Are memory to memory instructions allowed? Eg. ADD [123], [345] or MOV [123], [343] If not, then why? CO and Architecture co-and-architecture addressing-modes + – Asutosh asked Sep 6, 2018 Asutosh 487 views answer comment Share Follow See all 2 Comments See all 2 2 Comments reply MiNiPanda commented Sep 6, 2018 reply Follow Share 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.. 2 votes 2 votes Sanandan commented Sep 4, 2020 reply Follow Share I think RISC architectures wont allow such instructions but CISC may allow such instructions. 0 votes 0 votes Please log in or register to add a comment.
0 votes 0 votes In RISC instructions set all operands involved in an arithmetic or logic operation must either be in processor registers, or one of the operands may be given explicitly within the instruction word. and memory operands are accessed only using load store instructions. -Hamacher Jan Bhardwaj answered Nov 21, 2020 Jan Bhardwaj comment Share Follow See all 0 reply Please log in or register to add a comment.