dff01: add more tests.

1 files changed, 21 insertions, 0 deletions

diff --git a/testsuite/synth/dff01/dff06.vhdl b/testsuite/synth/dff01/dff06.vhdl
new file mode 100644
index 000000000..33f5590a6
--- /dev/null
+++ b/testsuite/synth/dff01/dff06.vhdl
@@ -0,0 +1,21 @@
+library ieee;
+use ieee.std_logic_1164.all;
+
+entity dff06 is
+  port (q : out std_logic;
+        d : std_logic;
+        clk : std_logic);
+end dff06;
+
+architecture behav of dff06 is
+begin
+  process (clk) is
+    variable a, b : std_logic;
+  begin
+    if rising_edge (clk) then
+      q <= b;
+      b := a;
+      a := d;
+    end if;
+  end process;
+end behav;