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Have you tried Quartus Synthesis?
Its my understanding that Quartus gives the best results anyway (Synopsys told us that).
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Yes, I have tried Quartus and this problem does not occur.
As for "best results" with Quartus, I doubt it... after all there is a reason why someone would pay some $$$ for a 3rd Party synthesis tool. The only thing I can be shure about Quartus synthesis is that it will know it's hardware better than a 3rd party tool. But intelligence in optimizing the netlist is inferior to Precision/Synplify
Taking Precision out of the tool chain is not an option...
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