iverilog/ivtest/ivltests/real_delay.sdf

(DELAYFILE
  (SDFVERSION "OVI 2.1")
  (TIMESCALE 1ns)
  (CELL
    (CELLTYPE "gate_sdf")
    (INSTANCE dut_f)
    (DELAY
      (ABSOLUTE
        (IOPATH in out (1.134) (0.0))
       )
    )
  )
)