Fix crash in bug21078.

1 files changed, 68 insertions, 0 deletions

diff --git a/testsuite/gna/bug21078/foo.vhdl b/testsuite/gna/bug21078/foo.vhdl
new file mode 100644
index 000000000..c490c8f4b
--- /dev/null
+++ b/testsuite/gna/bug21078/foo.vhdl
@@ -0,0 +1,68 @@
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+entity foo is
+end entity;
+
+architecture fum of foo is
+    
+    signal ia:      std_logic_vector(15 downto 0);
+    signal clock:   std_logic:='0';
+    signal cw:      unsigned(15 downto 0):=(others => '0');
+begin
+        
+    -- counter and  cw are converted to UNSIGNED to use numeric_std "+"
+    
+    
+CTR: process (clock)
+
+    variable counter : unsigned (15 downto 0) :=  x"0000";
+    variable op : std_logic_vector (7 downto 0);
+
+    begin
+
+        if clock'event and clock='1' then
+
+            op := std_logic_vector(cw (15 downto 8));
+
+        -- This if statement is misbehaving 
+            if (op = x"20") then
+                counter  := counter + cw (7 downto 0);
+            end if;
+
+            counter := counter + 2;
+
+            ia <= std_logic_vector(counter);
+
+        end if;
+
+    end process;
+
+CLK:    process
+    begin
+        if Now <= 200 ns then
+            wait for 10 ns;
+            clock <= not clock;
+        else
+            wait;
+        end if;
+
+    end process;
+
+STIMULUS:
+    process (clock)
+    begin
+        if clk'event and clock = '1' then
+            if Now = 110 ns then
+                cw <= X"200F";
+            else
+                cw <= (others => '0');
+            end if;
+        end if;
+    end process;
+    
+end architecture;
+
+    
+