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Message
From: Dimitrios Orfanos<sirtimid@g...>
Date: Wed Feb 20 09:59:43 CET 2008
Subject: [openrisc] or1ksim 's question
On Wednesday 20 February 2008 07:09:31 yueng wrote:
> by the way, where is the executed.log? i didn't find the file at cur dir or
> in the or1ksim install dir.
>
> Dimitri?s Orfanos wrote:
> > There are many answers for these questions.
> > 1)If you load the linux kernel on or1ksim and on the linux kernel you
> > run the program then of course you have more
> > instructions because the simulator runs and the linux kernel.
> > 2)The openrisc compiler produces code with many NOPs in the brand delay
> > slots. A better compiler (I haven't try to use the optimization switches
> > to say the truth , I mean to use the switch -o1 ,-o2 ,etc) could put in
> > the delay slots more useful code not NOPs.
> > 3)Does the simulator stops automatically the simulation or you have to
> > press Ctrl-C? The "exit" function that the compiler uses by default puts
> > the processor (here the simulator) to infinite loop(by executing NOPs)
> > after the normal execution of the program. So if you want to stop the
> > program you press Ctrl-C ,but you are not faster than the computer so
> > many NOPs came again in your code.
> > You can check the code that was executed by seeing the file
> > "executed.log" that is produced from the simulator if you set the
> > exec_log (or exe_log , I don't remember actually) from the sim.cfg to 1.
> > That's all I have to say. Hope this helps.
> >
> > yueng wrote:
> >> I change the sim.cfg , mem read and write both delay 1.
> >> i run jpeg decode in the or1ksim
> >> the result is
> >> 310,200,242 cycles, 171,816,396 instructions
> >> compare with arm7 it use only 56,000,000 cycle, and 40,000,000
> >> instructions
> >>
> >> i remember that i read or1ksim is about 90% cycle accurate somewhere,
> >> same jpeg decode C code ,why or1ksim use so many instructions? and so
> >> many
> >> cycles.
> >>
> >>
> >> thank you
> >
> > _______________________________________________
> > http://www.opencores.org/mailman/listinfo/openrisc
Have you set the exe_log=1 in the sim.cfg?
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