Generating Code for Procedures  
no parameters - with local variables
------------------------------------------------------------------------

Since there is no parameter passing, we will have the callee do
the work.

Caller:	jal _procedure_1_      (or some scheme to generate labels)

Callee:       

	_procedure_1_:
			sw	$ra, ($sp)  # store return address

				  1                           1
			sw	$s2,-4($sp) # store old level 2 display
				  3                           3

                                  1                            1
			la	$s2,($sp)    # reset new level 2 display
				  3                            3

			addi	$sp,-12     # increment by AR size

If you have no local variables, the AR size is 8 bytes, one variable 12 bytes,
two local variables then 16 bytes and so forth.

Generate the code for whatever the subprogram does.

Callee:  to return

			addi	$sp,12 (or 8 or 16 whatever the AR size)

				  1                             1
			lw	$s2,-4($sp) # restore old level 2 disp.
				  3                             3

			lw	$s4,($sp)   # set return address
			jr	$s4

------------------------------------------------------------------------

Your addresses and then as before for globals 

variables from level1:  -8($s1) for the first variable 
                        -12($s1) for the second variable (if exists)

               level2;  -8($s2) for the first one

and so on ...