[Solved] Given this ARM assembly code snippet:MOV R1, #4 loop: SUBS R1, R1, #1 BNE loopHow many times will the loop execute? | ARM Architecture

ARM Architecture - Control Flow Instructions

Given this ARM assembly code snippet:

MOV R1, #4
loop:
SUBS R1, R1, #1
BNE loop

How many times will the loop execute?

AInfinite loop

B5 times

C3 times

D4 times

Step-by-Step Solution

Solution:

Step 1: Analyze initial register value
R1 starts at 4, so the loop will count down from 4.
Step 2: Understand SUBS and BNE behavior
SUBS subtracts 1 and updates flags; BNE loops while R1 not zero.
Final Answer:
4 times -> Option D
Quick Check:
Loop count = initial value 4 [OK]

Quick Trick: Loop runs as many times as initial register value [OK]

Common Mistakes:

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