testsuite/synth: add a test for #2042

4 files changed, 108 insertions, 0 deletions

diff --git a/testsuite/synth/issue2042/ent.vhdl b/testsuite/synth/issue2042/ent.vhdl
new file mode 100644
index 000000000..5e8727a60
--- /dev/null
+++ b/testsuite/synth/issue2042/ent.vhdl
@@ -0,0 +1,34 @@
+library IEEE;
+use IEEE.std_logic_1164.ALL;
+use IEEE.numeric_std.all;
+
+entity ent is
+  generic (
+    g_NumberOfChannels : natural := 4;
+    g_BitsPerChannel   : natural := 16
+  );
+  port (
+    CLK     : in  std_logic;
+    RST     : in  std_logic;
+    DATA    : out std_logic_vector(g_NumberOfChannels*g_BitsPerChannel-1 downto 0)
+  );
+end entity;
+
+architecture arch of ent is
+
+  signal do_out : STD_LOGIC_VECTOR(15 DOWNTO 0);
+
+begin
+
+  process(RST, CLK)
+    variable cnt: natural range 0 to g_NumberOfChannels-1;
+  begin
+    if RST then
+      cnt := 0;
+    elsif rising_edge(CLK) then
+      DATA((cnt+1)*g_BitsPerChannel-1 downto cnt*g_BitsPerChannel) <= do_out(do_out'left downto 1+do_out'left-g_BitsPerChannel);
+      cnt := cnt + 1 when cnt<g_NumberOfChannels-1 else 0;
+    end if;
+  end process;
+
+end architecture;
diff --git a/testsuite/synth/issue2042/ent1.vhdl b/testsuite/synth/issue2042/ent1.vhdl
new file mode 100644
index 000000000..0225e9023
--- /dev/null
+++ b/testsuite/synth/issue2042/ent1.vhdl
@@ -0,0 +1,34 @@
+library IEEE;
+use IEEE.std_logic_1164.ALL;
+use IEEE.numeric_std.all;
+
+entity ent is
+  generic (
+    g_NumberOfChannels : natural := 4;
+    g_BitsPerChannel   : natural := 16
+  );
+  port (
+    CLK     : in  std_logic;
+    RST     : in  std_logic;
+    DATA    : out std_logic_vector(g_NumberOfChannels*g_BitsPerChannel-1 downto 0)
+  );
+end entity;
+
+architecture arch of ent is
+
+  signal do_out : STD_LOGIC_VECTOR(15 DOWNTO 0);
+
+begin
+
+  process(RST, CLK)
+    variable cnt: natural range 0 to g_NumberOfChannels-1;
+  begin
+    if RST then
+      cnt := 0;
+    elsif rising_edge(CLK) then
+      DATA((cnt+1)*g_BitsPerChannel-1 downto cnt*g_BitsPerChannel) <= do_out(do_out'left downto do_out'left-g_BitsPerChannel+1);
+      --  cnt := cnt + 1 when cnt<g_NumberOfChannels-1 else 0;
+    end if;
+  end process;
+
+end architecture;
diff --git a/testsuite/synth/issue2042/ent3.vhdl b/testsuite/synth/issue2042/ent3.vhdl
new file mode 100644
index 000000000..e54e4f41b
--- /dev/null
+++ b/testsuite/synth/issue2042/ent3.vhdl
@@ -0,0 +1,32 @@
+library IEEE;
+use IEEE.std_logic_1164.ALL;
+use IEEE.numeric_std.all;
+
+entity ent is
+  generic (
+    g_NumberOfChannels : natural := 4;
+    g_BitsPerChannel   : natural := 16
+  );
+  port (
+    CLK     : in  std_logic;
+    RST     : in  std_logic
+  );
+end entity;
+
+architecture arch of ent is
+
+  signal do_out : STD_LOGIC_VECTOR(15 DOWNTO 0);
+
+begin
+
+  process(RST, CLK)
+    variable cnt: natural range 0 to g_NumberOfChannels-1;
+  begin
+    if RST then
+      cnt := 0;
+    elsif rising_edge(CLK) then
+      cnt := cnt + 1 when cnt<g_NumberOfChannels-1 else 0;
+    end if;
+  end process;
+
+end architecture;
diff --git a/testsuite/synth/issue2042/testsuite.sh b/testsuite/synth/issue2042/testsuite.sh
new file mode 100755
index 000000000..c06b922b8
--- /dev/null
+++ b/testsuite/synth/issue2042/testsuite.sh
@@ -0,0 +1,8 @@
+#! /bin/sh
+
+. ../../testenv.sh
+
+GHDL_STD_FLAGS=--std=08
+synth_only ent3
+
+echo "Test successful"