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package Chisel
import Chisel.testers._
import org.scalatest._
import org.scalatest.prop._
import org.scalatest.prop.TableDrivenPropertyChecks._
class GCD extends Module {
val io = new Bundle {
val a = Bits(INPUT, 16)
val b = Bits(INPUT, 16)
val e = Bool(INPUT)
val z = Bits(OUTPUT, 16)
val v = Bool(OUTPUT)
}
val x = Reg(Bits(width = 16))
val y = Reg(Bits(width = 16))
when (x > y) { x := x -% y }
.otherwise { y := y -% x }
when (io.e) { x := io.a; y := io.b }
io.z := x
io.v := y === Bits(0)
}
class GCDSpec extends ChiselSpec {
class GCDTester(a: Int, b: Int, z: Int) extends BasicTester {
val dut = Module(new GCD)
val first = Reg(init=Bool(true))
dut.io.a := UInt(a)
dut.io.b := UInt(b)
dut.io.e := first
when(first) { first := Bool(false) }
when(dut.io.v) {
io.done := Bool(true)
io.error := (dut.io.z != UInt(z)).toUInt
}
}
val gcds = Table(
("a", "b", "z"), // First tuple defines column names
( 64, 48, 16), // Subsequent tuples define the data
( 12, 9, 3),
( 48, 64, 12))
"GCD" should "return the correct result" in {
forAll (gcds) { (a: Int, b: Int, z: Int) =>
assert(TesterDriver.execute{ new GCDTester(a, b, z) })
}
}
}
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