2 files changed, 38 insertions, 0 deletions
diff --git a/testsuite/issues/issue76/dff01.vhdl b/testsuite/issues/issue76/dff01.vhdl
new file mode 100644
index 0000000..b076f41
--- /dev/null
+++ b/testsuite/issues/issue76/dff01.vhdl
@@ -0,0 +1,29 @@
+library ieee;
+use ieee.std_logic_1164.all;
+
+entity dff01 is
+  port (q : out std_logic_vector (3 downto 0);
+        d : std_logic_vector (3 downto 0);
+        en : std_logic;
+        rst : std_logic;
+        clk : std_logic);
+end dff01;
+
+architecture behav of dff01 is
+  signal t : std_logic_vector (7 downto 0);
+  signal a : std_logic_vector (3 downto 0);
+begin
+  a <= d xor b"0101";
+  
+  process (clk) is
+  begin
+    if rst = '1' then
+      q <= x"0";
+    elsif rising_edge (clk) then
+      if en = '1' then
+        q <= d;
+        t (7 downto 4) <= a;
+      end if;
+    end if;
+  end process;
+end behav;
diff --git a/testsuite/issues/issue76/testsuite.sh b/testsuite/issues/issue76/testsuite.sh
new file mode 100755
index 0000000..7a6cdb3
--- /dev/null
+++ b/testsuite/issues/issue76/testsuite.sh
@@ -0,0 +1,9 @@
+#!/bin/sh
+
+topdir=../..
+. $topdir/testenv.sh
+
+run_yosys -q -p "ghdl dff01.vhdl -e; hierarchy -check -top dff01"
+
+clean
+echo OK