You want to implement an if-else in ARM assembly that sets R0 to 100 if R1 is less than 50, else sets R0 to 200. Which sequence correctly implements this?

hard📝 Application Q8 of 15

ARM Architecture - Control Flow Instructions

ACMP R1, #50\nBLT less_than\nMOV R0, #200\nB end\nless_than:\nMOV R0, #100\nend:

BCMP R1, #50\nBGT less_than\nMOV R0, #100\nB end\nless_than:\nMOV R0, #200\nend:

CCMP R1, #50\nBEQ less_than\nMOV R0, #100\nB end\nless_than:\nMOV R0, #200\nend:

DCMP R1, #50\nBNE less_than\nMOV R0, #200\nB end\nless_than:\nMOV R0, #100\nend:

Step-by-Step Solution

Solution:

Step 1: Understand condition
Set R0=100 if R1 < 50, else R0=200.
Step 2: Match branch instruction
BLT branches if less than, so BLT less_than is correct.
Step 3: Verify else part
If not less, MOV R0, #200 runs, then branch to end.
Final Answer:
Option A correctly implements the if-else logic -> Option A
Quick Check:
BLT for less than, else MOV 200 [OK]

Quick Trick: Use BLT for less than condition in ARM if-else [OK]

Common Mistakes:

Using BGT instead of BLT
Confusing BEQ with less than
Misplacing MOV instructions

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More ARM Architecture Quizzes

You want to implement an if-else in ARM assembly that sets R0 to 100 if R1 is less than 50, else sets R0 to 200. Which sequence correctly implements this?

Step 1: Understand condition

Step 2: Match branch instruction

Step 3: Verify else part

Final Answer:

Quick Check:

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