Chapter 6:

1. Chapter 6: 22342 – Computer Organization & Assembly Language Conditional Processing

2. Boolean Instructions • AND • AND reg, reg • AND reg, mem • AND reg, imm • AND mem, reg • AND mem, imm  Sign, Zero Flags • OR • XOR • NOT

3. Boolean Instructions Example: ASCII Case: A = 0100 0001 a = 0110 0001 Sentence = “I aM A sTudeNT”

4. Boolean Instructions • TEST (Similar to AND) • TEST reg, reg • TEST reg, mem • TEST reg, imm • TEST mem, reg • TEST mem, imm  Sign, Zero Flags

5. Compare Instruction • CMP (Similar to SUB) • CMP reg, reg • CMP reg, mem • CMP reg, imm • CMP mem, reg • CMP mem, imm  Carry, Overflow, Sign, Zero Flags

6. Jump on Condition Instructions • Jcondition Label • Zero • Carry • Overflow • Sign • CX = 0

7. Jump on Compare Result • Unsigned Comparison (CMP X, Y) • X > Y • X ≥ Y • X = Y • X < Y • X ≤ Y

8. Jump on Compare Result • Signed Comparison (CMP X, Y) • X > Y • X ≥ Y • X = Y • X < Y • X ≤ Y

9. Jump on Compare Result Example: Z = MAX ( X, Y )

10. Jump on Compare Result Example: D = MIN ( A, B, C )

11. Jump on Compare Result Example: Find the first nonzero element in an array

12. LOOP on Condition (Repeat While) • LOOPZ (LOOPE) • Decrement the Counter • If Counter > 0 and ZF = 1 jump to label • LOOPNZ (LOOPNE)

13. Chapter 6