read_verilog add_sub.v
hierarchy -top top
proc
equiv_opt -assert -map +/xilinx/cells_sim.v synth_xilinx # 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 14 t:LUT2
select -assert-count 6 t:MUXCY
select -assert-count 8 t:XORCY
select -assert-none t:LUT2 t:MUXCY t:XORCY %% t:* %D