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TITLE Addition and Subtraction (AddSub3.asm)

; Chapter 4 example. Demonstration of ADD, SUB,

; INC, DEC, and NEG instructions, and how

; they affect the CPU status flags.

; Last update: 2/1/02

INCLUDE Irvine32.inc

.data

Rval SDWORD ?

Xval SDWORD 26

Yval SDWORD 30

Zval SDWORD 40

.code

main PROC

; INC and DEC

mov ax,1000h

inc ax ; 1001h

dec ax ; 1000h

; Expression: Rval = -Xval + (Yval - Zval)

mov eax,Xval

neg eax ; -26

mov ebx,Yval

sub ebx,Zval ; -10

add eax,ebx

mov Rval,eax ; -36

; Zero flag example:

mov cx,1

sub cx,1 ; ZF = 1

mov ax,0FFFFh

inc ax ; ZF = 1

; Sign flag example:

mov cx,0

sub cx,1 ; SF = 1

mov ax,7FFFh

add ax,2 ; SF = 1

; Carry flag example:

mov al,0FFh

add al,1 ; CF = 1, AL = 00

; Overflow flag example:

mov al,+127

add al,1 ; OF = 1

mov al,-128

sub al,1 ; OF = 1

exit

main ENDP

END main