...

mov cx, 9               ; Count downward from 9 to 1

xor ax, ax              ; sum of even numbers

xor bx, bx              ; sum of odd numbers

​

l1:                     ; Entry point for the loop

test cx, 1              ; Is CX even?

jz l2                   ; Yes -> jump to the label l2

add bx, cx

jmp l3                  ; Skip the following instruction for even numbers

l2:

add ax, cx

l3:

loop l1                 ; Repeat until CX becomes 0

...

​