testsuite/synth: add tests for #1406

1 files changed, 27 insertions, 0 deletions

diff --git a/testsuite/synth/issue1406/half_adder.vhdl b/testsuite/synth/issue1406/half_adder.vhdl
new file mode 100644
index 000000000..4a6047ed4
--- /dev/null
+++ b/testsuite/synth/issue1406/half_adder.vhdl
@@ -0,0 +1,27 @@
+library ieee;
+use ieee.std_logic_1164.all;
+
+entity half_adder is
+  port (
+    clk_in   : in  std_logic;
+    n_rst_in : in  std_logic;
+    a_in     : in  std_logic;
+    b_in     : in  std_logic;
+    c_out    : out std_logic;
+    s_out    : out std_logic
+    );
+end half_adder;
+
+architecture rtl of half_adder is
+begin
+  reg_proc : process(clk_in, n_rst_in)
+  begin
+    if n_rst_in = '0' then
+      c_out <= '0';
+      s_out <= '0';
+    elsif rising_edge(clk_in) then
+      c_out <= a_in and b_in;
+      s_out <= a_in xor b_in;
+    end if;
+  end process reg_proc;
+end rtl;