testsuite/synth: add test for #1221

2 files changed, 23 insertions, 0 deletions

diff --git a/testsuite/synth/issue1221/testsuite.sh b/testsuite/synth/issue1221/testsuite.sh
new file mode 100755
index 000000000..88de793a8
--- /dev/null
+++ b/testsuite/synth/issue1221/testsuite.sh
@@ -0,0 +1,8 @@
+#! /bin/sh
+
+. ../../testenv.sh
+
+synth_analyze top
+clean
+
+echo "Test successful"
diff --git a/testsuite/synth/issue1221/top.vhdl b/testsuite/synth/issue1221/top.vhdl
new file mode 100644
index 000000000..ef9dd4312
--- /dev/null
+++ b/testsuite/synth/issue1221/top.vhdl
@@ -0,0 +1,15 @@
+library IEEE;
+use IEEE.STD_LOGIC_1164.ALL;
+use IEEE.NUMERIC_STD.ALL;
+
+entity top is
+	port(
+		a : in unsigned(7 downto 0);
+		q : out unsigned(7 downto 0)
+	);
+end entity;
+
+architecture arch of top is
+begin
+	q <= 0 - a;
+end architecture;