yosys/tests/arch/xilinx/counter.ys

read_verilog ../common/counter.v
hierarchy -top top
proc
flatten
equiv_opt -async2sync -assert -map +/xilinx/cells_sim.v synth_xilinx -noiopad # 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 1 t:BUFG
select -assert-count 8 t:FDCE
select -assert-count 1 t:INV
select -assert-count 7 t:MUXCY
select -assert-count 8 t:XORCY
select -assert-none t:BUFG t:FDCE t:INV t:MUXCY t:XORCY %% t:* %D