testsuite/synth: add a test for #1991

2 files changed, 35 insertions, 0 deletions

diff --git a/testsuite/synth/issue1991/issue.vhdl b/testsuite/synth/issue1991/issue.vhdl
new file mode 100644
index 000000000..a0c5967c5
--- /dev/null
+++ b/testsuite/synth/issue1991/issue.vhdl
@@ -0,0 +1,28 @@
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+entity issue is
+  port (
+    clk : in std_logic;
+    idx : in std_logic_vector(7 downto 0);
+    led : out std_logic
+  );
+end issue;
+
+architecture implementation of issue is
+
+begin
+
+    process(clk)
+    begin
+      if (rising_edge (clk)) then
+        if idx <= x"10000000" then
+          led <= '1';
+        else
+          led <= '0';
+        end if;
+      end if;
+    end process;
+
+end implementation;
diff --git a/testsuite/synth/issue1991/testsuite.sh b/testsuite/synth/issue1991/testsuite.sh
new file mode 100755
index 000000000..53b1b69ab
--- /dev/null
+++ b/testsuite/synth/issue1991/testsuite.sh
@@ -0,0 +1,7 @@
+#! /bin/sh
+
+. ../../testenv.sh
+
+synth_only issue
+
+echo "Test successful"