[Solved] You want to write ARM assembly code that jumps to handle_negative if a subtraction results in a negative value, and to... Which conditional branch instructions should you use after SUBS R5, R6, R7? | ARM Architecture

ARM Architecture - Control Flow Instructions

You want to write ARM assembly code that jumps to handle_negative if a subtraction results in a negative value, and to handle_zero if the result is zero. Which conditional branch instructions should you use after SUBS R5, R6, R7?

ABGT handle_negative and BNE handle_zero

BBLT handle_negative and BEQ handle_zero

CBLE handle_negative and BNE handle_zero

DBHS handle_negative and BLO handle_zero

Step-by-Step Solution

Solution:

Step 1: Understand SUBS and flag updates
SUBS subtracts and updates flags including negative (N) and zero (Z).
Step 2: Match flags to branch instructions
BLT branches if negative flag set (result negative), BEQ branches if zero flag set (result zero).
Step 3: Confirm correct instructions for conditions
BLT for negative result and BEQ for zero result are the correct choices.
Final Answer:
BLT handle_negative and BEQ handle_zero -> Option B
Quick Check:
Negative uses BLT, zero uses BEQ [OK]

Quick Trick: Use BLT for negative, BEQ for zero after SUBS [OK]

Common Mistakes:

Using BGT or BHS for negative values
Mixing zero and negative flag conditions
Using unsigned branch instructions incorrectly

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More ARM Architecture Quizzes

Which conditional branch instructions should you use after SUBS R5, R6, R7?

Step 1: Understand SUBS and flag updates

Step 2: Match flags to branch instructions

Step 3: Confirm correct instructions for conditions

Final Answer:

Quick Check:

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