1 files changed, 31 insertions, 0 deletions
diff --git a/src/test/scala/ChiselTests/GCD.scala b/src/test/scala/ChiselTests/GCD.scala
new file mode 100644
index 00000000..2702aaec
--- /dev/null
+++ b/src/test/scala/ChiselTests/GCD.scala
@@ -0,0 +1,31 @@
+package ChiselTests
+import Chisel._
+
+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 GCDTester(c: GCD) extends Tester(c) {
+  val (a, b, z) = (64, 48, 16)
+  do {
+    val first = if (t == 0) 1 else 0;
+    poke(c.io.a, a)
+    poke(c.io.b, b)
+    poke(c.io.e, first)
+    step(1)
+  } while (t <= 1 || peek(c.io.v) == 0)
+  expect(c.io.z, z)
+}