ARM Architecture - Control Flow Instructions
You want to conditionally execute three instructions only if the zero flag is set (EQ). Which IT block suffix correctly represents this?
You want to conditionally execute three instructions only if the zero flag is set (EQ). Which IT block suffix correctly represents this?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Understand IT block suffix letters
Each letter after IT indicates if the following instructions use the same (T) or inverse (E) condition.Step 2: Match suffix to three instructions
For three instructions, suffix length is 3 letters. 'ITTE' means first two instructions use EQ (T), third uses inverse (E).Step 3: Choose correct suffix for three instructions all EQ
'ITTE' is valid for three instructions with last inverted; 'ITTT' is for four instructions; 'ITTEE' is for four instructions; 'ITTE NE' uses wrong condition.Final Answer:
ITTE EQ -> Option BQuick Check:
Three instructions with correct suffix = ITTE EQ [OK]
Quick Trick: Suffix length = number of instructions; T = same, E = inverse condition [OK]
Common Mistakes:
- Using suffix length not matching instruction count
- Confusing T and E letters
- Applying wrong condition code after IT
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