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Why is using subroutines considered a best practice for modular ARM assembly code?

medium📝 Conceptual Q5 of 15
ARM Architecture - Subroutines and Stack
Why is using subroutines considered a best practice for modular ARM assembly code?
ABecause they isolate functionality, making code easier to update
BBecause they reduce the number of instructions executed
CBecause they eliminate the need for registers
DBecause they automatically handle memory management
Step-by-Step Solution
Solution:

  1. Step 1: Define modularity

    Modularity means separating code into independent parts.

  2. Step 2: Subroutine role

    Subroutines isolate specific tasks, simplifying updates.

  3. Final Answer:

    Because they isolate functionality, making code easier to update -> Option A

  4. Quick Check:

    Isolation aids maintainability [OK]
Quick Trick: Subroutines isolate tasks for easier updates [OK]
Common Mistakes:
  • Thinking subroutines reduce instruction count
  • Assuming subroutines manage memory automatically

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