[Solved] Identify the error in this ARM assembly code snippet:CMP R3, R4 BGT greater_label BLT less_label BEQ equal_labelAssuming R3 and R4 are signed integers, what is wrong? | ARM Architecture

ARM Architecture - Control Flow Instructions

Identify the error in this ARM assembly code snippet:

CMP R3, R4
BGT greater_label
BLT less_label
BEQ equal_label

Assuming R3 and R4 are signed integers, what is wrong?

ACMP does not update flags

BBGT and BLT cannot be used after CMP

CBGT and BLT check unsigned, should use BHI and BLS

DNo error, code is correct

Step-by-Step Solution

Solution:

Step 1: Understand CMP and flag updates
CMP subtracts R4 from R3 and updates flags for signed comparisons.
Step 2: Check branch instructions for signed comparisons
BGT (branch if greater than) and BLT (branch if less than) are correct for signed comparisons.
Step 3: Confirm code correctness
All branches correctly use signed condition codes after CMP, so no error.
Final Answer:
No error, code is correct -> Option D
Quick Check:
CMP + BGT/BLT correct for signed [OK]

Quick Trick: BGT/BLT are for signed, BHI/BLS for unsigned [OK]

Common Mistakes:

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