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// See LICENSE for license details.
package chiselTests
import Chisel._
import Chisel.testers.BasicTester
import org.scalatest._
import org.scalatest.prop._
class GCD extends Module {
val io = new Bundle {
val a = UInt(INPUT, 32)
val b = UInt(INPUT, 32)
val e = Bool(INPUT)
val z = UInt(OUTPUT, 32)
val v = Bool(OUTPUT)
}
val x = Reg(UInt(width = 32))
val y = Reg(UInt(width = 32))
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 === UInt(0)
}
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) {
assert(dut.io.z === UInt(z))
stop()
}
}
class GCDSpec extends ChiselPropSpec {
//TODO: use generators and this function to make z's
def gcd(a: Int, b: Int): Int = if(b == 0) a else gcd(b, a%b)
val gcds = Table(
("a", "b", "z"), // First tuple defines column names
( 64, 48, 16), // Subsequent tuples define the data
( 12, 9, 3),
( 48, 64, 16))
property("GCD should elaborate") {
elaborate { new GCD }
}
property("GCDTester should return the correct result") {
forAll (gcds) { (a: Int, b: Int, z: Int) =>
assert(execute{ new GCDTester(a, b, z) })
}
}
}
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