[Solved] How would you modify a recursive ARM function to handle large recursion depth safely? — Ans: Use the stack carefully by saving/restoring registers and limit recursion depth | ARM Architecture

ARM Architecture - Subroutines and Stack

How would you modify a recursive ARM function to handle large recursion depth safely?

AAvoid saving LR to speed up calls

BUse the stack carefully by saving/restoring registers and limit recursion depth

CUse only registers without stack to prevent overflow

DRemove base case to allow infinite recursion

Step-by-Step Solution

Solution:

Step 1: Understand recursion depth risks
Deep recursion can overflow stack if registers and return addresses are not saved properly.
Step 2: Apply safe stack usage
Saving/restoring LR and other registers on stack prevents corruption and allows safe returns.
Step 3: Limit recursion depth
Adding checks to stop recursion prevents stack overflow.
Final Answer:
Use the stack carefully by saving/restoring registers and limit recursion depth -> Option B
Quick Check:
Safe recursion = stack use + depth limit [OK]

Quick Trick: Save registers and limit depth to avoid stack overflow [OK]

Common Mistakes:

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