mov eax,0xAA004400        ; set EAX to 0xAA004400
push eax
dec esp
pop eax                   ; EAX = 0x004400??
add eax,0x33005500        ; EAX = 0x334455??
mov al,0x0                ; EAX = 0x33445500
mov ecx,0xAA006600
add al,ch                 ; EAX now contains 0x33445566