From 849fd62cfed9b6623865c7af76dd1bfbc6adf457 Mon Sep 17 00:00:00 2001
From: Clifford Wolf <clifford@clifford.at>
Date: Thu, 6 Feb 2014 01:00:11 +0100
Subject: [PATCH] Added counters sat test case

---
 tests/sat/counters.v  | 35 +++++++++++++++++++++++++++++++++++
 tests/sat/counters.ys | 10 ++++++++++
 2 files changed, 45 insertions(+)
 create mode 100644 tests/sat/counters.v
 create mode 100644 tests/sat/counters.ys

diff --git a/tests/sat/counters.v b/tests/sat/counters.v
new file mode 100644
index 000000000..09e273044
--- /dev/null
+++ b/tests/sat/counters.v
@@ -0,0 +1,35 @@
+
+module counter1(clk, rst, ping);
+	input clk, rst;
+	output ping;
+	reg [31:0] count;
+
+	always @(posedge clk) begin
+		if (rst)
+			count <= 0;
+		else
+			count <= count + 1;
+	end
+
+	assign ping = &count;
+endmodule
+
+module counter2(clk, rst, ping);
+	input clk, rst;
+	output ping;
+	reg [31:0] count;
+
+	integer i;
+	reg carry;
+
+	always @(posedge clk) begin
+		carry = 1;
+		for (i = 0; i < 32; i = i+1) begin
+			count[i] <= !rst & (count[i] ^ carry);
+			carry = count[i] & carry;
+		end
+	end
+
+	assign ping = &count;
+endmodule
+
diff --git a/tests/sat/counters.ys b/tests/sat/counters.ys
new file mode 100644
index 000000000..330895f82
--- /dev/null
+++ b/tests/sat/counters.ys
@@ -0,0 +1,10 @@
+
+read_verilog counters.v
+proc; opt
+
+expose -shared counter1 counter2
+miter -equiv -make_assert -make_outputs counter1 counter2 miter
+
+cd miter; flatten; opt
+sat -verify -prove-asserts -tempinduct -set-at 1 in_rst 1 -seq 1 -show-inputs -show-outputs
+