Question

Which statement is true of complex instruction set computers (CISC)?

A) The access calls to main memory are fewer as compared to RISC.
B) The programmer is explicitly required to call the loading and storing functions.
C) The instruction set supports all the low-level programming languages.
D) An instruction set executes a single low-level operation.

Answer 1

Complex Instruction Set Computers (CISC) reduce the number of access calls to main memory by using a rich instruction set to perform multiple operations with a single instruction.

Step-by-step explanation:

Complex Instruction Set Computers (CISC) are designed to decrease the number of instructions per program at the cost of more cycles per instruction. They use a rich instruction set with instructions that execute several low-level operations, such as memory access, arithmetic, and logic operations within a single instruction. Therefore, the characteristic feature of CISC is that a single instruction can result in several low-level operations. CISC processors often use complex addressing modes to reduce the number of instructions per program.

The correct statement regarding CISC in the options provided is: A) The access calls to main memory are fewer as compared to RISC. CISC architectures are designed to perform multiple operations with a single instruction which means fewer instructions are needed thereby reducing the frequency of access calls to main memory.