Instruction classification: ADD, CMP, and MUL belong to which category of instructions in common CPU instruction sets?

Difficulty: Easy

Correct Answer: Arithmetic

Explanation:

Introduction / Context:Arithmetic instructions manipulate numeric values, influencing flags that guide conditional execution. This question asks you to place three well-known instructions into their correct category.

Given Data / Assumptions:

  • ADD performs integer addition and sets flags like carry and zero as appropriate.
  • CMP subtracts operands to set flags but discards the result, enabling comparisons.
  • MUL multiplies operands and sets flags/expands results according to the ISA.

Concept / Approach:All three affect numeric state or flags in a way tied to arithmetic semantics, so they are grouped under arithmetic rather than data movement or control flow.

Step-by-Step Solution:

Identify ADD and MUL as straightforward arithmetic.Recognize CMP as arithmetic comparison via subtraction without storing.Map to the “Arithmetic” instruction class.Choose “Arithmetic.”

Verification / Alternative check:Instruction set documents categorize ADD/MUL/CMP with arithmetic/logic, distinct from data transfer and control operations.

Why Other Options Are Wrong:

Data transfer: No movement between locations is primary.Bit manipulation: Not purely logical masking or shifting.Loops and jumps: No branch or jump semantics.

Common Pitfalls:Misclassifying CMP because it stores no result; its sole purpose is arithmetic comparison via flags.

Final Answer:Arithmetic

Discussion & Comments

No comments yet. Be the first to comment!
Join Discussion