1 files changed, 19 insertions, 0 deletions
diff --git a/testsuite/synth/sns01/add03.vhdl b/testsuite/synth/sns01/add03.vhdl
new file mode 100644
index 000000000..16546bd0d
--- /dev/null
+++ b/testsuite/synth/sns01/add03.vhdl
@@ -0,0 +1,19 @@
+LIBRARY ieee;
+USE ieee.std_logic_1164.all;
+
+entity add03 is
+  port (
+    a, b : std_logic_vector(8 DOWNTO 0);
+    borrow : std_logic;
+    res : out std_logic_vector(8 DOWNTO 0));
+end add03;
+
+LIBRARY ieee;
+USE ieee.std_logic_arith.all;
+
+architecture behav of add03 is
+  signal t : signed(8 DOWNTO 0);
+begin
+  t <= signed(a) - signed(b) - borrow;
+  res <= std_logic_vector(t);
+end behav;