[Solved] Find the mistake in this ARM code:CMP R7, R8 BGE greater_equal_label BLT less_label — Ans: No mistake, behavior is expected | ARM Architecture

ARM Architecture - Control Flow Instructions

Find the mistake in this ARM code:

CMP R7, R8
BGE greater_equal_label
BLT less_label

ABGE and BLT conditions overlap incorrectly

BNo mistake, behavior is expected

CCMP should be SUBS

DFlags are not set correctly

Step-by-Step Solution

Solution:

Step 1: Understand CMP and flags
CMP R7, R8 sets flags correctly for signed comparison (R7 - R8).
Step 2: Analyze branch conditions
BGE (N == V) branches for greater or equal signed. If false (N != V), falls through to BLT (N != V), which branches for less than.
Step 3: Verify no issues
Conditions are mutually exclusive and exhaustive--no overlap, no gaps, correct behavior.
Final Answer:
No mistake, behavior is expected -> Option B
Quick Check:
BGE + BLT covers all signed cases [OK]

Quick Trick: BGE and BLT cover all cases; check logic carefully [OK]

Common Mistakes:

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