OPENCORES.ORG

Hello:
How do you compile the code? Do you use -O2? It seems like if the
multiplication is being done by software. 

Javier Castillo

-----Mensaje original-----
De: openrisc-bounces@o... [mailto:openrisc-bounces@o...]
En nombre de zhang_lsv@y...
Enviado el: lunes, 20 de diciembre de 2004 19:10
Para: openrisc@o...
Asunto: [openrisc] OpenRisc Benchmarking

Hi, I am working on the or1k benchmarking. What I did is using the same 
application C programs, compiling them and runing them on various core 
simulators. The number I got with the or1k is much larger than other 
avaiable processor cores, which seems to me is not reasonable.

Here is an example, I have the following FIR C program
==================
for (i=128;i<2048;i++) {
    dout = 0;
    for (j=0;j<128;j++)
          dout = dout + datain[i-j]*coeff[j];
}
==================

I firstly use the gcc compiler and ld to get the objective code. Then I 
use the "or32-uclinux-sim --enable-profiler ..". After that I use "or32-
uclinux-sim profiler -c". The report shows that the above code require 
72 Million cycles ! It is so high than it almost equals to 100 times of 
others' number. Looking at the code, it actually only has 2048*128*2 = 
500K operations. Are the overhead too large ?

Is something wrong in using the toolchain ? or the simulator didnot give 
a correct result ?

thanks
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