Computer Science Engineering (CSE) Exam > Computer Science Engineering (CSE) Questions > Which of the following statements is false ab...
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Which of the following statements is false about CISC architectures?
- a)CISC machine instructions may include complex addressing modes, which require many clock cycles to carry out.
- b)CISC control units are typically microprogrammed, allowing the instruction set to be more flexible.
- c)In the CISC instruction set, all arithmetic/logic instructions must be register based.
- d)CISC architectures may perform better in network centric applications than RISC.
Correct answer is option 'C'. Can you explain this answer?
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Which of the following statements is false about CISC architectures?a)...
In RISC instruction set all arithmetic/logic instructions must be register-based but not in CISC.
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Which of the following statements is false about CISC architectures?a)...
False Statement: In the CISC instruction set, all arithmetic/logic instructions must be register based.
Explanation:
CISC (Complex Instruction Set Computer) architectures are known for their ability to support complex instructions that can perform multiple operations in a single instruction. However, not all arithmetic/logic instructions in CISC architectures are required to be register based.
CISC architectures provide a variety of addressing modes that allow instructions to operate on different types of data and memory locations. These addressing modes can include direct addressing, indirect addressing, indexed addressing, and more. These complex addressing modes enable CISC architectures to manipulate data in memory efficiently and perform operations on data stored in different locations.
In a CISC architecture, the instructions are typically decoded and executed by a control unit. This control unit is often microprogrammed, meaning that it uses a microcode sequence to carry out the instructions. Microprogramming provides flexibility to the instruction set since the microcode can be easily modified or updated.
However, the requirement for arithmetic/logic instructions to be register based is not a characteristic of CISC architectures. CISC architectures do support register-based arithmetic/logic instructions, but they also allow for memory-based instructions. For example, CISC architectures may include instructions that perform arithmetic or logic operations directly on memory operands, without the need to load the operands into registers first.
This flexibility in addressing modes allows CISC architectures to handle a wide range of applications and different programming styles. It enables CISC architectures to support high-level language constructs and complex operations efficiently.
In conclusion, the false statement is that in the CISC instruction set, all arithmetic/logic instructions must be register based. CISC architectures support a variety of addressing modes, including memory-based instructions, which allow operations to be performed directly on memory operands.
Explanation:
CISC (Complex Instruction Set Computer) architectures are known for their ability to support complex instructions that can perform multiple operations in a single instruction. However, not all arithmetic/logic instructions in CISC architectures are required to be register based.
CISC architectures provide a variety of addressing modes that allow instructions to operate on different types of data and memory locations. These addressing modes can include direct addressing, indirect addressing, indexed addressing, and more. These complex addressing modes enable CISC architectures to manipulate data in memory efficiently and perform operations on data stored in different locations.
In a CISC architecture, the instructions are typically decoded and executed by a control unit. This control unit is often microprogrammed, meaning that it uses a microcode sequence to carry out the instructions. Microprogramming provides flexibility to the instruction set since the microcode can be easily modified or updated.
However, the requirement for arithmetic/logic instructions to be register based is not a characteristic of CISC architectures. CISC architectures do support register-based arithmetic/logic instructions, but they also allow for memory-based instructions. For example, CISC architectures may include instructions that perform arithmetic or logic operations directly on memory operands, without the need to load the operands into registers first.
This flexibility in addressing modes allows CISC architectures to handle a wide range of applications and different programming styles. It enables CISC architectures to support high-level language constructs and complex operations efficiently.
In conclusion, the false statement is that in the CISC instruction set, all arithmetic/logic instructions must be register based. CISC architectures support a variety of addressing modes, including memory-based instructions, which allow operations to be performed directly on memory operands.
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Which of the following statements is false about CISC architectures?a)CISC machine instructions may include complex addressing modes, which require many clock cycles to carry out.b)CISC control units are typically microprogrammed, allowing the instruction set to be more flexible.c)In the CISC instruction set, all arithmetic/logic instructions must be register based.d)CISC architectures may perform better in network centric applications than RISC.Correct answer is option 'C'. Can you explain this answer?
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