From 3f1b94705e7275aebb9ab64b36b69c32cc3372ed Mon Sep 17 00:00:00 2001
From: Tristan Gingold <tgingold@free.fr>
Date: Thu, 16 Jan 2020 18:27:21 +0100
Subject: testcase/synth: add reproducer from #1090

---
 testsuite/synth/issue1090/bootrom.vhdl         | 20 +++++++
 testsuite/synth/issue1090/simple_ram-orig.vhdl | 51 ++++++++++++++++++
 testsuite/synth/issue1090/simple_ram.vhdl      | 73 ++++++++++++++++++++++++++
 testsuite/synth/issue1090/tb_simple_ram.vhdl   | 46 ++++++++++++++++
 testsuite/synth/issue1090/testsuite.sh         | 16 ++++++
 5 files changed, 206 insertions(+)
 create mode 100644 testsuite/synth/issue1090/bootrom.vhdl
 create mode 100644 testsuite/synth/issue1090/simple_ram-orig.vhdl
 create mode 100644 testsuite/synth/issue1090/simple_ram.vhdl
 create mode 100644 testsuite/synth/issue1090/tb_simple_ram.vhdl
 create mode 100755 testsuite/synth/issue1090/testsuite.sh

(limited to 'testsuite')

diff --git a/testsuite/synth/issue1090/bootrom.vhdl b/testsuite/synth/issue1090/bootrom.vhdl
new file mode 100644
index 000000000..458e60274
--- /dev/null
+++ b/testsuite/synth/issue1090/bootrom.vhdl
@@ -0,0 +1,20 @@
+-- Machine generated from ram.img.
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+package bootrom is
+  type rom_t is array (0 to 127) of std_logic_vector(31 downto 0);
+  constant rom : rom_t := (
+    x"00000110",
+    x"00001ffc",
+    x"00000110",
+-- more stuff, doesn't matter as long as it fits...
+    x"23811fac",
+    x"00afffac",
+    others => x"00000000" );
+
+end package;
+
+package body bootrom is
+end package body;
diff --git a/testsuite/synth/issue1090/simple_ram-orig.vhdl b/testsuite/synth/issue1090/simple_ram-orig.vhdl
new file mode 100644
index 000000000..6cb4aa6f1
--- /dev/null
+++ b/testsuite/synth/issue1090/simple_ram-orig.vhdl
@@ -0,0 +1,51 @@
+-- A simple pre-initalized RAM, which reads from a binary file at synthesis time
+-- single 32 bit read/write port.
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+use work.bootrom.all;
+
+entity simple_ram is
+  generic (
+    -- 32-bit read/write port.  ADDR_WIDTH is in bytes, not words.
+    ADDR_WIDTH : integer := 8 -- default 32k
+    );
+  port (
+    clk : in std_logic;
+
+    en : in std_logic;
+    raddr : in std_logic_vector(ADDR_WIDTH - 3 downto 0);
+    do : out std_logic_vector(31 downto 0);
+
+    we : in std_logic_vector(3 downto 0);
+    waddr : in std_logic_vector(ADDR_WIDTH - 3 downto 0);
+    di : in std_logic_vector(31 downto 0)
+    );
+end simple_ram;
+
+architecture behavioral of simple_ram is
+  constant NUM_WORDS : integer :=  2**(ADDR_WIDTH - 2);
+  signal ram : rom_t := work.bootrom.rom;  -- FIXME init internal error
+begin
+
+  process (clk, en)
+    variable read : std_logic_vector(31 downto 0);
+  begin
+    if clk'event and clk = '1' then -- and en = '1' then -- Unsupported: clock enable
+      if we(3) = '1' then
+        ram(to_integer(unsigned(waddr)))(31 downto 24) <= di(31 downto 24);
+      end if;
+      if we(2) = '1' then
+        ram(to_integer(unsigned(waddr)))(23 downto 16) <= di(23 downto 16);
+      end if;
+      if we(1) = '1' then
+        ram(to_integer(unsigned(waddr)))(15 downto 8 ) <= di(15 downto 8 );
+      end if;
+      if we(0) = '1' then
+        ram(to_integer(unsigned(waddr)))(7  downto 0 ) <= di(7  downto 0 );
+      end if;
+      read := ram(to_integer(unsigned(raddr)));
+      do <= read;
+    end if;
+  end process;
+end behavioral;
diff --git a/testsuite/synth/issue1090/simple_ram.vhdl b/testsuite/synth/issue1090/simple_ram.vhdl
new file mode 100644
index 000000000..345083850
--- /dev/null
+++ b/testsuite/synth/issue1090/simple_ram.vhdl
@@ -0,0 +1,73 @@
+-- Machine generated from ram.img.
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+package bootrom is
+  type rom_t is array (0 to 127) of std_logic_vector(31 downto 0);
+  constant rom : rom_t := (
+    x"00000110",
+    x"00001ffc",
+    x"00000110",
+-- more stuff, doesn't matter as long as it fits...
+    x"23811fac",
+    x"00afffac",
+    others => x"00000000" );
+
+end package;
+
+package body bootrom is
+end package body;
+
+-- A simple pre-initalized RAM, which reads from a binary file at synthesis time
+-- single 32 bit read/write port.
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+entity simple_ram is
+  generic (
+    -- 32-bit read/write port.  ADDR_WIDTH is in bytes, not words.
+    ADDR_WIDTH : integer := 8 -- default 32k
+    );
+  port (
+    clk : in std_logic;
+
+    en : in std_logic;
+    raddr : in std_logic_vector(ADDR_WIDTH - 3 downto 0);
+    do : out std_logic_vector(31 downto 0);
+
+    we : in std_logic_vector(3 downto 0);
+    waddr : in std_logic_vector(ADDR_WIDTH - 3 downto 0);
+    di : in std_logic_vector(31 downto 0)
+    );
+end simple_ram;
+
+use work.bootrom.all;
+
+architecture behavioral of simple_ram is
+  constant NUM_WORDS : integer :=  2**(ADDR_WIDTH - 2);
+  signal ram : rom_t := work.bootrom.rom;  -- FIXME init internal error
+begin
+
+  process (clk, en)
+    variable read : std_logic_vector(31 downto 0);
+  begin
+    if clk'event and clk = '1' and en = '1' then -- Unsupported: clock enable
+      if we(3) = '1' then
+        ram(to_integer(unsigned(waddr)))(31 downto 24) <= di(31 downto 24);
+      end if;
+      if we(2) = '1' then
+        ram(to_integer(unsigned(waddr)))(23 downto 16) <= di(23 downto 16);
+      end if;
+      if we(1) = '1' then
+        ram(to_integer(unsigned(waddr)))(15 downto 8 ) <= di(15 downto 8 );
+      end if;
+      if we(0) = '1' then
+        ram(to_integer(unsigned(waddr)))(7  downto 0 ) <= di(7  downto 0 );
+      end if;
+      read := ram(to_integer(unsigned(raddr)));
+      do <= read;
+    end if;
+  end process;
+end behavioral;
diff --git a/testsuite/synth/issue1090/tb_simple_ram.vhdl b/testsuite/synth/issue1090/tb_simple_ram.vhdl
new file mode 100644
index 000000000..437c6543a
--- /dev/null
+++ b/testsuite/synth/issue1090/tb_simple_ram.vhdl
@@ -0,0 +1,46 @@
+entity tb_simple_ram is
+end tb_simple_ram;
+
+library ieee;
+use ieee.std_logic_1164.all;
+
+architecture behav of tb_simple_ram is
+  signal raddr : std_logic_vector(5 downto 0);
+  signal rdat : std_logic_vector(31 downto 0);
+  signal en : std_logic;
+  signal waddr : std_logic_vector(5 downto 0);
+  signal wdat : std_logic_vector(31 downto 0);
+  signal we : std_logic_vector (3 downto 0);
+  signal clk : std_logic;
+begin
+  dut: entity work.simple_ram
+    port map (clk => clk,
+              en => en, raddr => raddr, do => rdat,
+              we => we, waddr => waddr, di => wdat);
+
+  process
+    procedure pulse is
+    begin
+      clk <= '0';
+      wait for 1 ns;
+      clk <= '1';
+      wait for 1 ns;
+    end pulse;
+  begin
+    en <= '1';
+    raddr <= "000000";
+    we <= "0000";
+    waddr <= "000001";
+    wdat <= x"00_00_00_01";
+    pulse;
+    assert rdat = x"0000_0110" severity failure;
+
+    raddr <= "000001";
+    waddr <= "000010";
+    wdat <= x"00_00_00_02";
+    pulse;
+    assert rdat = x"0000_1ffc" severity failure;
+
+    wait;
+  end process;
+end behav;
diff --git a/testsuite/synth/issue1090/testsuite.sh b/testsuite/synth/issue1090/testsuite.sh
new file mode 100755
index 000000000..2e9bb84bb
--- /dev/null
+++ b/testsuite/synth/issue1090/testsuite.sh
@@ -0,0 +1,16 @@
+#! /bin/sh
+
+. ../../testenv.sh
+
+for t in simple_ram; do
+    analyze $t.vhdl tb_$t.vhdl
+    elab_simulate tb_$t
+    clean
+
+    synth $t.vhdl -e $t > syn_$t.vhdl
+    analyze syn_$t.vhdl tb_$t.vhdl
+    elab_simulate tb_$t --ieee-asserts=disable-at-0
+    clean
+done
+
+echo "Test successful"
-- 
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