You need to execute a single instruction only if the zero flag is set and the negative flag is clear in Thumb-2. How can this be implemented using IT blocks?

hard📝 Application Q9 of 15

ARM Architecture - Control Flow Instructions

AUse nested IT blocks: first <code>IT EQ</code>, then inside <code>IT PL</code> for negative flag clear

BUse <code>IT EQ</code> and combine conditions with a logical AND in the instruction

CUse <code>IT EQ</code> and inside it check the negative flag with a conditional instruction

DUse a single IT block with condition <code>IT NE</code> to cover both flags

Step-by-Step Solution

Solution:

Step 1: Understand conditions
Zero flag set corresponds to EQ, negative flag clear corresponds to PL (plus).
Step 2: Combining conditions
Thumb-2 IT blocks support only one condition code per block; to combine two conditions, nested IT blocks can be used.
Step 3: Implementation
First use IT EQ to check zero flag, then inside it use IT PL to check negative flag clear before the instruction.
Final Answer:
Use nested IT blocks: first IT EQ, then inside IT PL for negative flag clear -> Option A
Quick Check:
Nested IT blocks combine multiple conditions [OK]

Quick Trick: Use nested IT blocks for multiple flag conditions [OK]

Common Mistakes:

Trying to combine conditions in one IT block
Using incorrect condition codes
Assuming IT supports logical AND directly

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More ARM Architecture Quizzes

You need to execute a single instruction only if the zero flag is set and the negative flag is clear in Thumb-2. How can this be implemented using IT blocks?

Step 1: Understand conditions

Step 2: Combining conditions

Step 3: Implementation

Final Answer:

Quick Check:

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