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Find the mistake in this ARM code:

medium📝 Analysis Q7 of 15
ARM Architecture - Control Flow Instructions
Find the mistake in this ARM code:
CMP R0, #0
BEQ
MOV R1, #1
ACMP instruction syntax is wrong
BBEQ should be BNE
CMOV instruction cannot follow CMP
DBranch instruction missing target label
Step-by-Step Solution
Solution:

  1. Step 1: Examine branch instruction

    BEQ requires a label to branch to if the condition is met, but none is provided.

  2. Step 2: Confirm other instructions

    CMP and MOV instructions are syntactically correct.

  3. Final Answer:

    Branch instruction missing target label -> Option D

  4. Quick Check:

    Branch must specify label [OK]
Quick Trick: Branch instructions always need a label target [OK]
Common Mistakes:
  • Omitting label after branch
  • Confusing CMP syntax

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