[Solved] Identify the error in this ARM assembly if-else snippet:CMP R2, #5 BNE else_label MOV R3, #1 else_label: MOV R3, #0 | ARM Architecture

ARM Architecture - Control Flow Instructions

Identify the error in this ARM assembly if-else snippet:

CMP R2, #5
BNE else_label
MOV R3, #1
else_label:
MOV R3, #0

AMissing branch to skip else after if block

BIncorrect comparison instruction

CWrong register used in MOV

DNo labels defined

Step-by-Step Solution

Solution:

Step 1: Understand the flow
If R2 equals 5, BNE is not taken, so MOV R3, #1 executes, then execution continues to else_label and MOV R3, #0 runs.
Step 2: Identify missing branch
There is no branch to skip the else block after the if block, so both blocks run sequentially, overwriting R3.
Final Answer:
Missing branch to skip else after if block -> Option A
Quick Check:
Missing jump after if causes both blocks to run [OK]

Quick Trick: Add branch after if block to skip else [OK]

Common Mistakes:

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