import chisel3._

class Multiplier extends Module{
    val io = IO(new Bundle{
        val a = Input(UInt(32.W))
        val b = Input(UInt(32.W))
        val out = Output(UInt(64.W))
    })



    when ( io.b =/= 0.U ){
        when (io.b(0) === 1.U){
            val add = Module( new Addern(64) )
            add.io.a(31,0) := io.a
            add.io.b(31,0) := io.out
            add.io.cin := 0.U
            io.out := add.io.sum
        }
        io.a := io.a << 1
        io.b := io.b >> 1
    }
}