Moves.asm

TITLE Data Transfer Examples - J. Gavin Ray (6/8/12)


INCLUDE Irvine32.inc
.data
val1  WORD 1000h
val2  WORD 2000h

arrayB  BYTE  10h,20h,30h,40h,50h
arrayW  WORD  100h,200h,300h
arrayD  DWORD 10000h,20000h

.code
main PROC

;  MOVZX
	mov    bx,0A69Bh
	movzx  eax,bx		; EAX = 0000A69Bh
	movzx  edx,bl		; EDX = 0000009Bh
	movzx  cx,bl		; CX  = 009Bh
	call DumpRegs

;  MOVSX
	mov   bx,0A69Bh
	movsx eax,bx		; EAX = FFFFA69Bh
	movsx edx,bl		; EDX = FFFFFF9Bh
	movsx cx,bl		; CX  = FF9Bh

;  Memory-to-memory exchange:
	mov  ax,val1		; AX = 1000h
	xchg ax,val2		; AX = 2000h, val2 = 1000h
	mov  val1,ax		; val1 = 2000h
	call DumpRegs

;  Direct-Offset Addressing (byte array):
	mov al,arrayB		; AL = 10h
	mov al,[arrayB+1]		; AL = 20h
	mov al,[arrayB+2]		; AL = 30h

;  Direct-Offset Addressing (word array):
	mov ax,arrayW		; AX = 100h
	mov ax,[arrayW+2]		; AX = 200h

;  Direct-Offset Addressing (doubleword array):
	mov eax,arrayD		; EAX = 10000h
	mov eax,[arrayD+4]		; EAX = 20000h
	mov eax,[arrayD+TYPE arrayD]	; EAX = 20000h

	call DumpRegs
	exit
main ENDP
END main