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In page Complex instruction set computer:

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A complex instruction set computer (CISC ) is a computer architecture in which single instructions can execute several low-level operations (such as a load from memory, an arithmetic operation, and a memory store) or are capable of multi-step operations or addressing modes within single instructions.[citation needed] The term was retroactively coined in contrast to reduced instruction set computer (RISC)[1] and has therefore become something of an umbrella term for everything that is not RISC,[citation needed] where the typical differentiating characteristic is that most RISC designs use uniform instruction length for almost all instructions, and employ strictly separate load and store instructions.