CWD - 8086

Converts word to double word.
If High bit of AX=1 then : DX = 65535 (0FFFFh)
else : DX = 0

Syntax

CWD

Example

MOV DX, 0   ; DX = 0
MOV AX, 0   ; AX = 0
MOV AX, -5  ; DX AX = 00000h:0FFFBh
CWD         ; DX AX = 0FFFFh:0FFFBh
RET

Output / Return Value

Limitations

Alternatives / See Also

Reference