5 files changed, 126 insertions, 0 deletions
diff --git a/testsuite/gna/issue1664/ppm.vhdl b/testsuite/gna/issue1664/ppm.vhdl
new file mode 100644
index 000000000..a3cdc42f4
--- /dev/null
+++ b/testsuite/gna/issue1664/ppm.vhdl
@@ -0,0 +1,84 @@
+library IEEE;
+use IEEE.std_logic_1164.all;
+use IEEE.numeric_std.all;
+
+entity ppm_cap is
+	port (
+		i_ppm 	: in std_logic;
+		i_clk 	: in std_logic;
+		i_rst 	: in std_logic;
+		o_index	: out unsigned(3 downto 0);
+		o_count	: out unsigned(15 downto 0);
+		o_write	: out std_logic
+	);
+end ppm_cap;
+
+architecture behavioral of ppm_cap is
+	type state_type is (IDLE, A, B, WRITE_BACK);
+	signal CurState, NextState : state_type;
+	signal s_index 	: unsigned(3 downto 0);
+	signal s_count 	: unsigned(15 downto 0);
+	signal s_acc	: std_logic;
+	signal s_wrout	: std_logic;
+
+	signal s_wrcnt	: integer range 0 to 3;
+
+begin
+
+	o_index <= s_index;
+	o_count <= s_count;
+	o_write <= s_wrout;
+
+	clk_proc : process(i_clk) begin
+		if(i_rst = '1') then	
+			CurState <= IDLE;
+		else 
+			if(s_acc = '1') then
+				s_count <= s_count + 1;
+			end if;
+			if(CurState = WRITE_BACK) then
+				s_wrcnt <= s_wrcnt + 1;
+			end if;
+			CurState <= NextState;
+		end if;
+	end process clk_proc;
+
+	state_machine : process(CurState, i_ppm) begin 
+		case CurState is
+			when IDLE =>
+				s_index <= x"0";
+				s_count <= x"0000";
+				s_acc <= '0';
+				o_write <= '0';
+				if(i_ppm = '0') then
+					NextState <= A;
+				else 
+					NextState <= IDLE;
+				end if;
+			
+			when A =>
+				if(i_ppm = '1') then
+					s_acc <= '1';
+					NextState <= B;
+				else 
+					NextState <= A;
+				end if;
+			
+			when B =>
+				if(i_ppm = '0') then
+					s_acc <= '0';
+					NextState <= WRITE_BACK;
+				end if;
+			
+			when WRITE_BACK =>
+				if(s_wrcnt = 3 and s_index => 5) then
+					s_index <= s_index + 1;
+					NextState <= A;
+				elsif(s_wrcnt = 3 and s_index = 5) then
+					NextState <= IDLE;
+				end if;
+			when others =>
+				NextState <= IDLE;
+		end case;
+	end process state_machine;
+end behavioral; -- behavioral
diff --git a/testsuite/gna/issue1664/repro.vhdl b/testsuite/gna/issue1664/repro.vhdl
new file mode 100644
index 000000000..4ee9d3a49
--- /dev/null
+++ b/testsuite/gna/issue1664/repro.vhdl
@@ -0,0 +1,12 @@
+entity repro is
+end;
+
+architecture behavioral of repro is
+	signal s_index 	: natural;
+	signal s_wrcnt	: integer range 0 to 3;
+begin
+	state_machine : process
+        begin
+          assert (s_wrcnt = 3 and s_index => 5);
+	end process state_machine;
+end behavioral; -- behavioral
diff --git a/testsuite/gna/issue1664/repro2.vhdl b/testsuite/gna/issue1664/repro2.vhdl
new file mode 100644
index 000000000..b629677c7
--- /dev/null
+++ b/testsuite/gna/issue1664/repro2.vhdl
@@ -0,0 +1,9 @@
+entity repro2 is
+end;
+
+architecture behavioral of repro2 is
+	signal s_index 	: natural;
+	signal s_wrcnt	: integer range 0 to 3;
+begin
+  assert (s_wrcnt = 3 and s_index => 5);
+end behavioral; -- behavioral
diff --git a/testsuite/gna/issue1664/repro3.vhdl b/testsuite/gna/issue1664/repro3.vhdl
new file mode 100644
index 000000000..e3680d22c
--- /dev/null
+++ b/testsuite/gna/issue1664/repro3.vhdl
@@ -0,0 +1,10 @@
+entity repro3 is
+end;
+
+architecture behavioral of repro3 is
+	signal s_index 	: natural;
+	signal s_wrcnt	: integer range 0 to 3;
+        constant c : integer_vector := (0 => 1);
+begin
+  assert (s_wrcnt = 3 and s_index => 5) = c;
+end behavioral; -- behavioral
diff --git a/testsuite/gna/issue1664/testsuite.sh b/testsuite/gna/issue1664/testsuite.sh
new file mode 100755
index 000000000..5b1f16527
--- /dev/null
+++ b/testsuite/gna/issue1664/testsuite.sh
@@ -0,0 +1,11 @@
+#! /bin/sh
+
+. ../../testenv.sh
+
+export GHDL_STD_FLAGS=--std=08
+analyze_failure repro.vhdl
+analyze_failure ppm.vhdl
+
+clean
+
+echo "Test successful"