1 files changed, 24 insertions, 0 deletions
diff --git a/tests/simple/carryadd.v b/tests/simple/carryadd.v
new file mode 100644
index 00000000..4f777f79
--- /dev/null
+++ b/tests/simple/carryadd.v
@@ -0,0 +1,24 @@
+module carryadd(a, b, y);
+
+parameter WIDTH = 8;
+
+input [WIDTH-1:0] a, b;
+output [WIDTH-1:0] y;
+
+genvar i;
+generate
+	for (i = 0; i < WIDTH; i = i+1) begin:STAGE
+		wire IN1 = a[i], IN2 = b[i];
+		wire C, Y;
+		if (i == 0)
+			assign C = IN1 & IN2, Y = IN1 ^ IN2;
+		else
+			assign C = (IN1 & IN2) | ((IN1 | IN2) & STAGE[i-1].C),
+			       Y = IN1 ^ IN2 ^ STAGE[i-1].C;
+		assign y[i] = Y;
+	end
+endgenerate
+
+// assert property (y == a + b);
+
+endmodule