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Byte division
- 2. COOL GROUP SAIRA ZAHEER 1430314 MAIRA JUNAID 1430297 RABICAAFZAL 1430309
- 3. OUTLINE DIVISION DIV IDIV WORD FORM BYTE FORM DIVIDE OVERFLOW EXAMPLES SIGN EXTENSION OF DIVIDEND WORD DIVISION BYTE DIVISION EFFECT OF FLAG CONCLUSION
- 4. DIVISION THERE ARE TWO DIVISON OPERATORS: DIV (UNSIGNED DIVIDE) IDIV(SIGNED DIVIDE) SYNTAX: DIV divisor & IDIV divisor BYTE FORM: Divisor is in 8-bit register.The 16-bit dividend is in AX RESULT OF BYTE FORM:8-bit Quotient is in AL.8-bit Remainder is in AH
- 5. WORD FORM: Divisor is a 16-bit register. The 32-bit dividend is in DX:AX RESULT OF WORD FORM:16-bit Quotient is in AX.16-bit Remainder is in DX DIVISOR NOT BE A CONSTANT
- 6. DIVIDE OVERFLOW If the divisor is much smaller than the dividend, the Quotient will be too big to fit in the specified destination that is AL or AX .It gives error DIVIDE OVERFLOW
- 7. EXAMPLE OF DIVIDE OVERFLOW SUPPOSE AX CONTAINS 00FBH AND BL CONTAINS FFH instruction Decimal quotient Decimal Reminder AX AL DIV BL 0 251 FB 00 IDIV BL DIVIDE OVERFLOW
- 8. EXAMPLE OF DIV SUPPOSE DX CONTAINS 0000H,AX CONTAINS 0005H,AND BX CONTAINS 0002H 0002H. Instruction Decimal quotient Decimal remainder AX DX DIV BX 2 1 0002 0001
- 9. EXAMPLE OF IDIV SUPPOSE DX CONTAINS 0000H,AX CONTAINS 0005H,AND BX CONTAINS FFFEH instruction Decimal quotient Decimal remainder AX DX IDIV BX -2 1 FFFE 0001
- 10. SIGN EXTENSION OF THE DIVIDEND WORD DIVISION FOR DIV,DX should be cleared. FOR IDIV,DX should sign extension of AX. The instruction CWD will do the extension.
- 11. EXAMPLE OF WORD DIVISION DIVIDE-1250 BY 7 MOV AX,-1250 ;AX gets dividend CWD ;Extend sign to DX MOV BX,7 ;BX has divisor IDIV BX ;AX gets quotient, ;DX has remainder
- 12. BYTE DIVISION FOR DIV,AH should be cleared. FOR IDIV,AH should the sign extension of AL. The instruction CBW (Convert byte to word) will do the extension.
- 13. EXAMPLE OF BYTE DIVISION DIVIDE THE SIGNED VALU OF THE BYTE VARIABLE XBYTE BY -7 MOV AL,XBYTE ;AL has dividend CBW ;Extend sign to AH MOV BL,-7 ;BL has divisor IDIV BL ;AL has quotient,AH has remainder
- 14. EFFECT OF FLAGES THERE IS NO EFFECT OF CBW AND CWD ON THE FLAGS
- 15. THANKS FOR YOUR ATTENTION SPECIAL THANX TO MOMINA FOR HELPING US IN PREPARATION