read_verilog ../common/shifter.v
hierarchy -top top
proc
flatten
equiv_opt -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 8 t:TRELLIS_FF
select -assert-none t:TRELLIS_FF %% t:* %D