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flattening synthetic operators

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Hi, I have seen that flattening synthetic operators right after elaboration time, before any synthesis gives more efficient implementation (smaller area, faster circuit and less CPU runtime).

I want to know whether flattening operators before any synthesis has a disadvantage?


Originally posted in cdnusers.org by sporadic crash
Parents

  • Hi Sporadic Crash,

    long time no post. My understanding is that ungrouping synthetic operators is not such a hot idea. Basically, the way it was explained to me is that RC will loose its ability to re-architect the DP components and also you will miss out on things like speculation and op-merging. Not sure what version of RC you are using but since 7.1 if I am not mistaken, there is also the attributes dp_postmap_upsize and downsize. This allows RC to even change DP architecture later during incremental. Seems to cost me some runtime but the results have been pretty good. I also know that there is the ability to do auto_ungrouping in 7.2 but have not played much with it. I would be curious to hear if you have.

    good luck,
    gh-


    Originally posted in cdnusers.org by grasshopper
Reply

  • Hi Sporadic Crash,

    long time no post. My understanding is that ungrouping synthetic operators is not such a hot idea. Basically, the way it was explained to me is that RC will loose its ability to re-architect the DP components and also you will miss out on things like speculation and op-merging. Not sure what version of RC you are using but since 7.1 if I am not mistaken, there is also the attributes dp_postmap_upsize and downsize. This allows RC to even change DP architecture later during incremental. Seems to cost me some runtime but the results have been pretty good. I also know that there is the ability to do auto_ungrouping in 7.2 but have not played much with it. I would be curious to hear if you have.

    good luck,
    gh-


    Originally posted in cdnusers.org by grasshopper
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