overlap two sprites(16x16) Z80

overlap:
    //  only size 16x16 pixel
    //  l-X1,h-Y1  (sprite coordinates)
    //  e-X2,d-Y2  (other sprite coordinates)
    //  crash regs: A,B
    //  return: A
    ld b,0
    ld a,e
    add 15
    cp l
    jr c,oo3
    inc b
oo3:
    ld a,l
    add 16
    cp e
    jr nc,oo4
    inc b
oo4:
    ld a,d
    add 16
    cp h
    jr nc,oo5
    inc b
oo5:
    ld a,h
    add 15
    cp d
    jr c,oo6
    inc b
oo6:
    ld a,b
    //  overlap if A == 2
    ret