read_rtlil << EOT
module \top
  wire width 4 input 0 \A
  wire output 1 \Y

  cell $lut $0
    parameter \WIDTH 4
    parameter \LUT 16'0110100110010110
    connect \A \A
    connect \Y \Y
  end
end
EOT

hierarchy -auto-top


equiv_opt -assert lut2bmux


lut2bmux

select -assert-count 0 t:$lut
select -assert-count 1 t:$bmux r:WIDTH=1 r:S_WIDTH=4 %i