yosys/tests/arch/ice40/dffs.ys

read_verilog ../common/dffs.v
design -save read

hierarchy -top dff
proc
equiv_opt -assert -map +/ice40/cells_sim.v synth_ice40 # equivalency check
design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
cd dff # Constrain all select calls below inside the top module
select -assert-count 1 t:SB_DFF
select -assert-none t:SB_DFF %% t:* %D

design -load read
hierarchy -top dffe
proc
equiv_opt -assert -map +/ice40/cells_sim.v synth_ice40 # equivalency check
design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
cd dffe # Constrain all select calls below inside the top module
select -assert-count 1 t:SB_DFFE
select -assert-none t:SB_DFFE %% t:* %D