testsuite/synth: add a test for #2072

1 files changed, 37 insertions, 0 deletions

diff --git a/testsuite/synth/issue2072/tb_swaptest.vhdl b/testsuite/synth/issue2072/tb_swaptest.vhdl
new file mode 100644
index 000000000..194f3c9d0
--- /dev/null
+++ b/testsuite/synth/issue2072/tb_swaptest.vhdl
@@ -0,0 +1,37 @@
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+library std;
+use std.textio.all;
+
+entity tb_swaptest is
+end tb_swaptest;
+
+architecture behaviour of tb_swaptest
+is
+	constant clk_period : time := 10 ns;
+	signal clk : std_logic;
+	signal d : unsigned(7 downto 0) := X"c5";
+	signal q : unsigned(7 downto 0);
+begin
+
+	clk_process: process
+	begin
+	    for i in 1 to 10 loop
+		clk <= '0';
+		wait for clk_period/2;
+		clk <= '1';
+		wait for clk_period/2;
+	    end loop;
+	    wait;
+	end process;
+
+	st : entity work.swaptest
+	port map (
+		clk => clk,
+		d => d,
+		q => q
+	);
+
+end architecture;