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- ; Program Name: PRG_2CP.S
- ; Version: 1.002
- ; Assembly Instructions:
-
- ; Assemble in PC-relative mode and save with a TOS extension, then
- ; change the name to PRG_2CR, assemble in Relocatable mode and save as
- ; PRG_2CR.TOS. This will allow you to prepare two object code files from
- ; the same source file.
-
- ; Execution Instructions:
-
- ; Execute program SPEEDTST.TTP and type PRG_2CP.TOS on the input
- ; parameter line. SPEEDTST.TTP will produce a data file named PRG_2CP.DAT
- ; on disk. You will be able to compare the data for this program to that
- ; produced for programs PRG_2CC.TOS and PRG_2CR.TOS.
-
- ; Do the same with PRG_2CR.TOS to produce a data file named PRG_2CR.DAT.
- ; You can view the DAT files with an editor, from the desktop using the Show
- ; function or by printing them.
-
- ; Program Function:
-
- ; Statements within a nested loop structure are executed 50,000 times
- ; so that the load and execution time of this program can be compared with
- ; similar programs assembled in the Relocatable and Combo modes.
-
- store_after_load_time:
- trap #3 ; Returns value of system clock in D0.
- lea after_load_time, a0
- move.w d0, (a0) ; Store time in variable "after_load_time".
-
- move.w #9, d1 ; Initialize outer loop counter.
- outer_loop: ; Loop ten times.
- move.w #49999, d0 ; Initialize inner loop counter.
- inner_loop: ; Loop 50,000 times.
- move.l #label, a0
- lea label, a0
- move.l label, a0
- move.l #label, -(sp)
- pea label
- move.l label, -(sp)
- lea $C(sp), sp ; Reposition stack pointer to top of stack.
- dbra d0, inner_loop ; Loop back until D0 = -1.
- dbra d1, outer_loop ; Loop back until D1 = -1.
-
- terminate:
- move.w after_load_time, -(sp) ; Pass after load time to SPEEDTST.TTP.
- move.w #$4C, -(sp) ; Function = p_term = GEMDOS $4C.
- trap #1
-
- data
-
- ; NOTE: Below, the variable "label" is supposed to be a pointer to the
- ; variable "after_load_time". If this program is assembled in
- ; Relocatable mode, the "run time" address of "after_load_time" will be
- ; stored in the 4 bytes declared at "label" when the program is loaded
- ; from disk to ram.
-
- ; But, if the program is assembled in PC-relative mode, the "run time"
- ; address will not be stored there; instead, the "assembly time" address
- ; will be stored in the 4 bytes. That is undesirable.
-
- label: dc.l after_load_time ; This does not give desired response for
- bss ; PC-relative assembly, it works for
- after_load_time: ds.w 1 ; Relocatable assembly.
- end
-