read_verilog -icells opt_rmdff.v
prep
design -stash gold
read_verilog -icells opt_rmdff.v
proc
opt_rmdff

select -assert-count 0 c:remove*
select -assert-min 7 c:keep*
select -assert-count 0  t:$dffe 7:$_DFFE_* %u c:noenable* %i

design -stash gate

design -import gold -as gold
design -import gate -as gate

equiv_make gold gate equiv
hierarchy -top equiv
equiv_simple -undef
equiv_status -assert

#design -load gold
#stat
#
#design -load gate
#stat