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LEC report additional FF

theodoredj
We have a huge design with many redundant FFs.
It's impossible to clean up the RTL as they are coming from many different IP vendors.

Synopsys DC optimized out all those redundant FFs as their outputs go to nowhere. However,
LEC doesn't see this and failed on RTL VS Netlist check.

We tried to turn on and off many flatten mode options, as -seq_constant, -gated_clock, -seq_redundant, -LIB_SEQ_Redundant etc.
Nothing works.

LEC passed when we set some options in DC to keep those redundant FFs.
But we really don't want to keep them.

Any suggestions? Thank you!
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