"If you had written that code by hand using a human brain instead of a fixed routine from a dumb machine, you only need:

[set port x.y]
[return to label z]

to achieve the same result."

Well, I wrote a function in 'C' to duplicate the functionality of your organically generated assembler. When I compiled it I got:

0000 D297 SETB a
0002 22 RET

And that was with optimisations turned off!