What is the likely consequence if a function changes a callee-saved register but does NOT restore it before returning?

medium📝 Analysis Q5 of 15

ARM Architecture - Subroutines and Stack

AThe callee-saved registers are automatically restored by hardware

BThe function will execute faster without saving registers

CThe caller may observe corrupted register values leading to incorrect behavior

DNo effect since callee-saved registers are not used by the caller

Step-by-Step Solution

Solution:

Step 1: Role of callee-saved registers
They must be preserved to maintain caller's context.
Step 2: Effect of not restoring
Caller sees unexpected register values, causing bugs.
Final Answer:
The caller may observe corrupted register values leading to incorrect behavior -> Option C
Quick Check:
Unrestored registers cause caller errors [OK]

Quick Trick: Not restoring callee-saved registers corrupts caller state [OK]

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