A chisel GCD circuit example

GCD.fir

circuit GCD :
  module GCD :
    input clock : Clock
    input reset : UInt<1>
    output io : {flip a : UInt<16>, flip b : UInt<16>, flip e : UInt<1>, z : UInt<16>, v : UInt<1>}

    reg x : UInt, clock @[GCD.scala 15:15]
    reg y : UInt, clock @[GCD.scala 16:15]
    node _T_9 = gt(x, y) @[GCD.scala 18:11]
    when _T_9 : @[GCD.scala 18:16]
      node _T_10 = sub(x, y) @[GCD.scala 18:25]
      node _T_11 = asUInt(_T_10) @[GCD.scala 18:25]
      node _T_12 = tail(_T_11, 1) @[GCD.scala 18:25]
      x <= _T_12 @[GCD.scala 18:20]
      skip @[GCD.scala 18:16]
    else : @[GCD.scala 19:16]
      node _T_13 = sub(y, x) @[GCD.scala 19:25]
      node _T_14 = asUInt(_T_13) @[GCD.scala 19:25]
      node _T_15 = tail(_T_14, 1) @[GCD.scala 19:25]
      y <= _T_15 @[GCD.scala 19:20]
      skip @[GCD.scala 19:16]
    when io.e : @[GCD.scala 21:15]
      x <= io.a @[GCD.scala 21:19]
      y <= io.b @[GCD.scala 21:30]
      skip @[GCD.scala 21:15]
    io.z <= x @[GCD.scala 22:8]
    node _T_17 = eq(y, UInt<1>("h00")) @[GCD.scala 23:13]
    io.v <= _T_17 @[GCD.scala 23:8]