yosys/tests/arch/xilinx/opt_lut_ins.ys

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read_rtlil << EOF
module \top
wire width 4 input 1 \A
wire output 2 \O
cell \LUT4 $0
parameter \INIT 16'1111110011000000
connect \I0 \A [0]
connect \I1 \A [1]
connect \I2 \A [2]
connect \I3 \A [3]
connect \O \O
end
end
EOF
read_verilog -lib +/xilinx/cells_sim.v
equiv_opt -assert -map +/xilinx/cells_sim.v opt_lut_ins -tech xilinx
design -load postopt
select -assert-count 1 t:LUT3