[Solved] What will be the effect of this Thumb-2 code?IT GT MOVGT R4, #10 MOVLE R5, #20If the signed comparison sets the greater-than flag? | ARM Architecture

ARM Architecture - Control Flow Instructions

What will be the effect of this Thumb-2 code?

IT GT
MOVGT R4, #10
MOVLE R5, #20

If the signed comparison sets the greater-than flag?

AR5 is set to 20, R4 is unchanged

BR4 is set to 10, R5 is unchanged

CBoth R4 and R5 are set

DNeither R4 nor R5 is set

Step-by-Step Solution

Solution:

Step 1: Interpret IT GT
IT GT means the following instructions execute if greater-than condition is true.
Step 2: Check instructions conditions
MOVGT R4 executes if GT is true; MOVLE R5 executes if less or equal (LE) is true.
Final Answer:
R4 is set to 10, R5 is unchanged -> Option B
Quick Check:
GT true runs MOVGT only [OK]

Quick Trick: GT runs first instruction; LE runs second in IT block [OK]

Common Mistakes:

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