yosys/tests/ecp5/adffs.ys

read_verilog adffs.v
proc
flatten
equiv_opt -multiclock -assert -map +/ecp5/cells_sim.v synth_ecp5 # equivalency check
design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
cd top # Constrain all select calls below inside the top module
select -assert-count 4 t:TRELLIS_FF
select -assert-count 3 t:LUT4
select -assert-none t:TRELLIS_FF t:LUT4 %% t:* %D