Add bug15993.

4 files changed, 213 insertions, 0 deletions

diff --git a/testsuite/gna/bug15993/cells.vhdl b/testsuite/gna/bug15993/cells.vhdl
new file mode 100644
index 000000000..98a1aa507
--- /dev/null
+++ b/testsuite/gna/bug15993/cells.vhdl
@@ -0,0 +1,33 @@
+-------------------------------------------------------------------------------

+LIBRARY ieee;

+USE ieee.std_logic_1164.all;

+-------------------------------------------------------------------------------

+--| c | a | b | s | c

+--|---+---+---+---+--

+--| 0 | 0 | 0 | 0 | 0

+--| 0 | 0 | 1 | 1 | 0

+--| 0 | 1 | 0 | 1 | 0

+--| 0 | 1 | 1 | 0 | 1

+--| 1 | 0 | 0 | 1 | 0

+--| 1 | 0 | 1 | 0 | 1

+--| 1 | 1 | 0 | 0 | 1

+--| 1 | 1 | 1 | 1 | 1

+

+ENTITY addern IS

+    GENERIC ( n : INTEGER );

+    PORT ( a, b : IN STD_LOGIC_VECTOR ( n-1 DOWNTO 0 );

+            cin : IN STD_LOGIC;

+            sum : OUT STD_LOGIC_VECTOR ( n DOWNTO 0 ) );

+END addern;

+

+ARCHITECTURE behave OF addern IS

+

+    SIGNAL carry : STD_LOGIC;

+BEGIN

+    carry <= cin;

+    suma : FOR i IN 0 TO n - 1 GENERATE

+        sum(i) <= ( a(i) XOR b(i) ) XOR carry ;

+        carry  <= ( a(i) AND b(i) ) OR (carry AND ( a(i) XOR b(i) ));

+    END GENERATE;

+    sum(n) <= carry;

+END behave;

diff --git a/testsuite/gna/bug15993/testbench.vhdl b/testsuite/gna/bug15993/testbench.vhdl
new file mode 100644
index 000000000..bf81138c7
--- /dev/null
+++ b/testsuite/gna/bug15993/testbench.vhdl
@@ -0,0 +1,68 @@
+-- Test Bench

+-- inspired from http://ghdl.free.fr/ghdl/A-full-adder.html#A-full-adder

+-------------------------------------------------------------------------------

+LIBRARY ieee;

+USE ieee.std_logic_1164.all;

+-------------------------------------------------------------------------------

+ENTITY add_tb IS

+END add_tb;

+-------------------------------------------------------------------------------

+ARCHITECTURE behave OF add_tb IS

+    COMPONENT add4

+        GENERIC ( n : INTEGER := 4 );

+        PORT ( a, b : IN STD_LOGIC_VECTOR ( n-1 DOWNTO 0 );

+                cin : IN STD_LOGIC;

+                sum : OUT STD_LOGIC_VECTOR ( n DOWNTO 0 ) );

+    END COMPONENT;

+    

+    FOR ALL: add4 USE ENTITY work.addern;

+    

+    SIGNAL i0, i1  : STD_LOGIC_VECTOR ( 3 DOWNTO 0 );

+    SIGNAL s       : STD_LOGIC_VECTOR ( 4 DOWNTO 0 );

+    SIGNAL ci      : STD_LOGIC;    

+

+BEGIN

+    adder0: add4 

+        PORT MAP ( a => i0, b => i1, cin => ci, sum => s );

+    --  This process does the real job.

+    PROCESS

+        TYPE pattern_type IS RECORD

+            --  The inputs of the adder.

+            i0, i1 : STD_LOGIC_VECTOR( 3 DOWNTO 0 );

+            ci : STD_LOGIC;

+            --  The expected outputs of the adder.

+            s  : STD_LOGIC_VECTOR( 4 DOWNTO 0 );

+        END RECORD;

+        --  The patterns to apply.

+        TYPE pattern_array IS ARRAY (natural RANGE <>) OF pattern_type;

+        CONSTANT patterns : pattern_array :=

+            (("0000", "0000", '0', "00000"),

+             ("0000", "0001", '0', "00001"),

+             ("0001", "0000", '0', "00001"),

+             ("0001", "0001", '0', "00010"),

+             ("0001", "0001", '1', "00011"),

+             ("0001", "0010", '0', "00011"),

+             ("0001", "0010", '1', "00100"),

+             ("0010", "0010", '0', "00100"));

+    BEGIN

+      --  Check each pattern.

+      FOR i IN patterns'RANGE LOOP

+        --  Set the inputs.

+        i0 <= patterns(i).i0;

+        i1 <= patterns(i).i1;

+        ci <= patterns(i).ci;

+        --  Wait for the results.

+        WAIT FOR 1 ns;

+        --  Check the outputs.

+        

+        ASSERT s = patterns(i).s

+           REPORT "bad sum value" SEVERITY note;

+--         assert co = patterns(i).co

+--           report "bad carray out value" severity error;

+       END LOOP;

+       ASSERT false REPORT "end of test" SEVERITY note;

+       --  Wait forever; this will finish the simulation.

+       WAIT;

+    END PROCESS;

+

+END behave;

diff --git a/testsuite/gna/bug15993/testbench_15993.vhdl b/testsuite/gna/bug15993/testbench_15993.vhdl
new file mode 100644
index 000000000..b1391e4b0
--- /dev/null
+++ b/testsuite/gna/bug15993/testbench_15993.vhdl
@@ -0,0 +1,97 @@
+-- Test Bench

+-- inspired from http://ghdl.free.fr/ghdl/A-full-adder.html#A-full-adder

+-------------------------------------------------------------------------------

+LIBRARY ieee;

+USE ieee.std_logic_1164.all;

+use IEEE.NUMERIC_STD.ALL;

+-------------------------------------------------------------------------------

+ENTITY add_tb IS

+END add_tb;

+-------------------------------------------------------------------------------

+ARCHITECTURE behave OF add_tb IS

+    COMPONENT add4

+        GENERIC ( n : INTEGER := 4 );

+        PORT ( a, b : IN STD_LOGIC_VECTOR ( n-1 DOWNTO 0 );

+                cin : IN STD_LOGIC;

+                sum : OUT STD_LOGIC_VECTOR ( n DOWNTO 0 ) );

+    END COMPONENT;

+    

+    FOR ALL: add4 USE ENTITY work.addern;

+    

+    SIGNAL i0, i1  : STD_LOGIC_VECTOR ( 3 DOWNTO 0 );

+    SIGNAL s       : STD_LOGIC_VECTOR ( 4 DOWNTO 0 );

+    SIGNAL ci      : STD_LOGIC;    

+

+    subtype hexstring is string(1 to 12);

+

+    function to_hex(n: in std_logic_vector) return hexstring is

+        variable n_int : std_logic_vector(n'high + 3 downto 0);

+        variable digit : unsigned(3 downto 0);

+        variable d_pos : natural;

+        variable s     : hexstring := (others => ' ');

+    begin

+        -- assert n'high < 32 report "Hex conversion failed; supports 32 bits max!" severity warning;

+        n_int := (others => '0');

+        n_int(n'range) := n;

+        for i in 1 to (n'length + 3)/4 loop

+            d_pos := ((n'length + 3)/4 - i) * 4;

+            digit := unsigned(n_int(d_pos+3 downto d_pos));

+            -- look after metavalues...

+            if Is_X(std_logic_vector(digit)) then

+                s(i) := 'X';

+            elsif digit > 9 then

+                s(i) := character'val(character'pos('A') 

+                        + to_integer(digit) - 10);

+            else 

+                s(i) := character'val(character'pos('0') 

+                        + to_integer(digit));

+            end if;

+        end loop;

+        return s;

+    end to_hex;

+

+BEGIN

+    adder0: add4 

+        PORT MAP ( a => i0, b => i1, cin => ci, sum => s );

+    --  This process does the real job.

+    PROCESS

+        TYPE pattern_type IS RECORD

+            --  The inputs of the adder.

+            i0, i1 : STD_LOGIC_VECTOR( 3 DOWNTO 0 );

+            ci : STD_LOGIC;

+            --  The expected outputs of the adder.

+            s  : STD_LOGIC_VECTOR( 4 DOWNTO 0 );

+        END RECORD;

+        --  The patterns to apply.

+        TYPE pattern_array IS ARRAY (natural RANGE <>) OF pattern_type;

+        CONSTANT patterns : pattern_array :=

+            (("0000", "0000", '0', "00000"),

+             ("0000", "0001", '0', "00001"),

+             ("0001", "0000", '0', "00001"),

+             ("0001", "0001", '0', "00010"),

+             ("0001", "0001", '1', "00011"),

+             ("0001", "0010", '0', "00011"),

+             ("0001", "0010", '1', "00100"),

+             ("0010", "0010", '0', "00100"));

+    BEGIN

+      --  Check each pattern.

+      FOR i IN patterns'RANGE LOOP

+        --  Set the inputs.

+        i0 <= patterns(i).i0;

+        i1 <= patterns(i).i1;

+        ci <= patterns(i).ci;

+        --  Wait for the results.

+        WAIT FOR 1 ns;

+        --  Check the outputs.

+        

+        ASSERT s = patterns(i).s

+           REPORT "bad sum : value " & to_hex(s) & "should be " & to_hex(patterns(i).s) SEVERITY note;

+--         assert co = patterns(i).co

+--           report "bad carray out value" severity error;

+       END LOOP;

+       ASSERT false REPORT "end of test" SEVERITY note;

+       --  Wait forever; this will finish the simulation.

+       WAIT;

+    END PROCESS;

+

+END behave;

diff --git a/testsuite/gna/bug15993/testsuite.sh b/testsuite/gna/bug15993/testsuite.sh
new file mode 100755
index 000000000..d291abdf8
--- /dev/null
+++ b/testsuite/gna/bug15993/testsuite.sh
@@ -0,0 +1,15 @@
+#! /bin/sh
+
+. ../../testenv.sh
+
+analyze cells.vhdl
+
+analyze testbench_15993.vhdl
+elab_simulate add_tb
+
+analyze testbench.vhdl
+elab_simulate add_tb
+
+clean
+
+echo "Test successful"