1 files changed, 33 insertions, 0 deletions
diff --git a/testsuite/synth/issue1080/repro3.vhdl b/testsuite/synth/issue1080/repro3.vhdl
new file mode 100644
index 000000000..252f705c8
--- /dev/null
+++ b/testsuite/synth/issue1080/repro3.vhdl
@@ -0,0 +1,33 @@
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+entity repro3 is
+  port (
+    clk : std_logic;
+    led : out std_logic);
+end;
+
+architecture behav of repro3 is
+    constant LOOKUP_LEN   : integer := 6;
+    constant LOOKUP_TABLE : unsigned(LOOKUP_LEN*8-1 downto 0) :=
+        x"010205" & x"060708";
+
+    signal brt : unsigned(7 downto 0) := (others => '0');
+
+begin
+  led <= brt (0);
+    lookup_p : process(Clk)
+        variable idx : integer range 0 to LOOKUP_LEN-1 := LOOKUP_LEN-1;
+    begin
+        if rising_edge(Clk) then
+            brt <= lookup_table(8*idx+7 downto 8*idx);
+
+            if idx /= 0 then
+              idx := idx - 1;
+            else
+              idx := LOOKUP_LEN-1;
+            end if;
+        end if;
+    end process;
+end behav;