CISC RISC

What does CISC mean?

Complex Instruction Set Computing

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What does RISC mean?

Reduced Instruction Set Computing

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In which architecture do programs take up more RAM?

RISC (Because programs have to be implemented using a larger amount of instructions)

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Which architecture usually has the higher clock speed?

RISC

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Which architecture contains more general-purpose registers?

RISC

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Which architecture is most similar to high-level programming?

CISC

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Which architecture contains the highest amount of instructions?

CISC

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Which architecture attempts to lower execution speed by performing less instructions per program?

CISC

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Which architecture attempts to reduce execution speed by executing instructions faster (less CPU cycles per instruction)?

RISC

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Which architecture has issues with performing pipelining?

CISC (This is because CISC instructions can vary in length meaning the CPU has to start decoding it before it can finish the fetching stage, whereas RISC instructions are always 4 bytes so no decoding has to be performed)

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In which architecture are instructions allowed to directly modify memory, while also performing other functions?

CISC (In RISC, only LOAD and STORE can modify memory directly)

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In which architecture do instructions perform multiple steps?

CISC (RISC instructions generally only perform a single action)

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Which architecture requires more effort from the compiler to perform compliation to?

RISC (Because 'simple' operations need to be translated into more instructions than in CISC)

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Which architecture provides less memory addressing options?

RISC (Because most instructions can't directly access RAM, but only registers)

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CISC RISC

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