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What's the difference between -seed and -svseed in irun?

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There are two options to control random seed when using irun: -seed, -svseed.

It seems that these two options is doing the same thing: set a random seed to RNG. And I tried many times, I can't find difference between these two options. Both can be used to control Verilog/SystemVerilog randomization, for example:

-seed 123

-svseed 123

-seed random

-svseed random

So, what's the difference between these two options?

Thanks!

Parents

  •  Regarding irun, one thing which is useful is "irun -helpall | grep <word of interest". So irun-helpall | grep seed gives:

      -seed <seed>               Set the seed value for SystemVerilog and Specman
      -snseed <seed>             Pass seed value to Specman
      -svseed <seed>             Set SystemVerilog default RNG seed
     
    Numbers are seeds, "random" will be randomly generated seeds.
     
    Regards,
    -hannes 
Reply

  •  Regarding irun, one thing which is useful is "irun -helpall | grep <word of interest". So irun-helpall | grep seed gives:

      -seed <seed>               Set the seed value for SystemVerilog and Specman
      -snseed <seed>             Pass seed value to Specman
      -svseed <seed>             Set SystemVerilog default RNG seed
     
    Numbers are seeds, "random" will be randomly generated seeds.
     
    Regards,
    -hannes 
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