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Message
From: yueng<penguin00@m...>
Date: Wed Feb 20 06:03:17 CET 2008
Subject: [openrisc] or1ksim 's question
thank you.
i just compile the c files to make a jpeg.or32
and sim -i jpeg.or32. dosn't load linux kernel.
i set a break point at the end of program. then run until it meet the
breakpoint .to see how many cycles the algorithm used.
yes,there are many nops instrustion in the simulation. and i try the
optimization -o1 -o2 switch,
the result is the same ,seemed -o1 or -o2 is not changing anything.
i test or1k's perfomance with arm7 or arm9, so i use some algorithm ,for
example
jpeg decode run both on or1k and arm. to see which one use less cycles.
and my result is or1ksim use 300M cycle and 200M instruction to finish a
320x240 jpegdecode compared
with arm7 50M cycle and 40M instruction.
next will try the algorithm on the verilog simulation ,to see if has a
better performance--use less cycle.
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.
>
>
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