yosys/tests/ice40/logic.ys

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read_verilog logic.v
hierarchy -top top
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 top # Constrain all select calls below inside the top module
select -assert-count 9 t:SB_LUT4
select -assert-none t:SB_LUT4 %% t:* %D