Given the following ARM assembly code snippet, what will be the value in register r0 after execution?

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ARM Architecture - Control Flow Instructions

Given the following ARM assembly code snippet, what will be the value in register r0 after execution?

B skip
MOV r0, #1
skip:
MOV r0, #5

DUndefined

Step-by-Step Solution

Solution:

Step 1: Analyze the branch instruction
The instruction B skip jumps over the MOV r0, #1 line directly to the label skip.
Step 2: Determine which MOV executes
Since the jump skips the first MOV, only MOV r0, #5 runs, setting r0 to 5.
Final Answer:
5 -> Option A
Quick Check:
Branch skips first MOV, r0 = 5 [OK]

Quick Trick: Branch skips code, so last MOV sets r0 [OK]

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