testsuite/synth: add a test for #938

4 files changed, 109 insertions, 0 deletions

diff --git a/testsuite/synth/issue938/ent.vhdl b/testsuite/synth/issue938/ent.vhdl
new file mode 100644
index 000000000..6d38a9548
--- /dev/null
+++ b/testsuite/synth/issue938/ent.vhdl
@@ -0,0 +1,20 @@
+entity ent is
+    port (
+        r : in bit;
+        s : in bit;
+        q : out bit
+    );
+end entity;
+
+architecture a of ent is
+begin
+    process(r, s)
+    begin
+        if r = '1' then
+            q <= '0';
+        elsif s = '1' then
+            q <= '1';
+        end if;
+    end process;
+end;
+
diff --git a/testsuite/synth/issue938/latches.vhdl b/testsuite/synth/issue938/latches.vhdl
new file mode 100644
index 000000000..0fcd7a8ba
--- /dev/null
+++ b/testsuite/synth/issue938/latches.vhdl
@@ -0,0 +1,21 @@
+library ieee;
+use ieee.std_logic_1164.all;
+
+entity latches is
+ port(
+  G, D, CLR : in  std_logic;
+  Q         : out std_logic
+ );
+end latches;
+
+architecture archi of latches is
+begin
+ process(CLR, D, G)
+ begin
+  if (CLR = '1') then
+   Q <= '0';
+  elsif (G = '1') then
+   Q <= D;
+  end if;
+ end process;
+end archi;
diff --git a/testsuite/synth/issue938/tb_latches.vhdl b/testsuite/synth/issue938/tb_latches.vhdl
new file mode 100644
index 000000000..75e6e8c2f
--- /dev/null
+++ b/testsuite/synth/issue938/tb_latches.vhdl
@@ -0,0 +1,52 @@
+entity tb_latches is
+end tb_latches;
+
+library ieee;
+use ieee.std_logic_1164.all;
+
+architecture behav of tb_latches is
+  signal g : std_logic;
+  signal d : std_logic;
+  signal clr : std_logic;
+  signal q : std_logic;
+begin
+  dut: entity work.latches
+    port map (g, d, clr, q);
+
+  process
+  begin
+    clr <= '1';
+    g <= '0';
+    wait for 1 ns;
+    assert q = '0' severity failure;
+
+    clr <= '0';
+    wait for 1 ns;
+    assert q = '0' severity failure;
+
+    g <= '1';
+    d <= '1';
+    wait for 1 ns;
+    assert q = '1' severity failure;
+
+    g <= '0';
+    d <= '0';
+    wait for 1 ns;
+    assert q = '1' severity failure;
+
+    g <= '1';
+    d <= '0';
+    wait for 1 ns;
+    assert q = '0' severity failure;
+
+    g <= '1';
+    d <= '1';
+    wait for 1 ns;
+    assert q = '1' severity failure;
+
+    clr <= '1';
+    wait for 1 ns;
+    assert q = '0' severity failure;
+    wait;
+  end process;
+end behav;
diff --git a/testsuite/synth/issue938/testsuite.sh b/testsuite/synth/issue938/testsuite.sh
new file mode 100755
index 000000000..ea5722dfc
--- /dev/null
+++ b/testsuite/synth/issue938/testsuite.sh
@@ -0,0 +1,16 @@
+#! /bin/sh
+
+. ../../testenv.sh
+
+analyze latches.vhdl tb_latches.vhdl
+elab_simulate tb_latches
+
+clean
+
+synth --latches latches.vhdl -e > syn_latches.vhdl
+analyze syn_latches.vhdl tb_latches.vhdl
+elab_simulate tb_latches
+
+clean
+
+echo "Test successful"