[Solved] Given the following Thumb-2 code snippet:IT NE MOVNE R0, #1 MOVEQ R1, #2 MOVNE R2, #3 MOVNE R3, #4Which registers will be updated if the zero flag is clear? | ARM Architecture

ARM Architecture - Control Flow Instructions

Given the following Thumb-2 code snippet:

IT NE
MOVNE R0, #1
MOVEQ R1, #2
MOVNE R2, #3
MOVNE R3, #4

Which registers will be updated if the zero flag is clear?

AR0 and R1 only

BR1 only

CR1, R2, and R3

DR0, R2, and R3

Step-by-Step Solution

Solution:

Step 1: Understand condition NE
NE means 'not equal', so instructions with NE execute if zero flag is clear.
Step 2: Identify instructions executed
MOVNE R0, MOVNE R2, and MOVNE R3 execute; MOVEQ R1 executes only if zero flag is set.
Final Answer:
R0, R2, and R3 -> Option D
Quick Check:
Zero flag clear = NE instructions run [OK]

Quick Trick: NE condition runs when zero flag is clear [OK]

Common Mistakes:

Master "Control Flow Instructions" in ARM Architecture

9 interactive learning modes - each teaches the same concept differently

More ARM Architecture Quizzes

Given the following Thumb-2 code snippet: