[Solved] Which ARM assembly code correctly sums numbers from 1 to 5 using a loop?MOV R0, #5 MOV R1, #0 loop: ADD R1, R1, R0 SUBS R0, R0, #1 BNE loop | ARM Architecture

ARM Architecture - Control Flow Instructions

Which ARM assembly code correctly sums numbers from 1 to 5 using a loop?

MOV R0, #5
MOV R1, #0
loop:
ADD R1, R1, R0
SUBS R0, R0, #1
BNE loop

ACorrectly sums 5+4+3+2+1 in R1

BAdds only 5 to R1 repeatedly

CDoes not decrement R0, infinite loop

DSkips adding when R0 is 1

Step-by-Step Solution

Solution:

Step 1: Analyze loop logic
R0 starts at 5, decrements each iteration, adding to R1.
Step 2: Confirm loop exit
SUBS updates flags; BNE loops until R0 is zero.
Step 3: Verify sum correctness
Sum is 5+4+3+2+1 = 15 stored in R1.
Final Answer:
Correctly sums 5+4+3+2+1 -> Option A
Quick Check:
Decrement and add each loop iteration [OK]

Quick Trick: Decrement counter and add in loop for sum [OK]

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Which ARM assembly code correctly sums numbers from 1 to 5 using a loop?