From 2f4337f027ec97dd93642ea2db70873e9192fb3b Mon Sep 17 00:00:00 2001
From: Tristan Gingold
Date: Sun, 7 Dec 2014 11:40:58 +0100
Subject: Add perf02 (performance issue).

---
 testsuite/gna/perf02/compressed.vhd | 65 +++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 testsuite/gna/perf02/compressed.vhd

(limited to 'testsuite/gna/perf02/compressed.vhd')

diff --git a/testsuite/gna/perf02/compressed.vhd b/testsuite/gna/perf02/compressed.vhd
new file mode 100644
index 0000000..0860168
--- /dev/null
+++ b/testsuite/gna/perf02/compressed.vhd
@@ -0,0 +1,65 @@
+library ieee;
+use ieee.std_logic_1164.all;
+
+
+library ieee;
+use ieee.numeric_std.all;
+
+entity compressed is
+	port (
+		clk : in  std_logic;
+		ra0_data : out std_logic_vector(31 downto 0);
+		wa0_addr : in  std_logic_vector(6 downto 0);
+		wa0_en : in  std_logic;
+		ra0_addr : in  std_logic_vector(6 downto 0);
+		wa0_data : in  std_logic_vector(31 downto 0)
+	);
+end compressed;
+architecture augh of compressed is
+
+	-- Embedded RAM
+
+	type ram_type is array (0 to 127) of std_logic_vector(31 downto 0);
+	signal ram : ram_type := (others => (others => '0'));
+
+
+	-- Little utility functions to make VHDL syntactically correct
+	--   with the syntax to_integer(unsigned(vector)) when 'vector' is a std_logic.
+	--   This happens when accessing arrays with <= 2 cells, for example.
+
+	function to_integer(B: std_logic) return integer is
+		variable V: std_logic_vector(0 to 0);
+	begin
+		V(0) := B;
+		return to_integer(unsigned(V));
+	end;
+
+	function to_integer(V: std_logic_vector) return integer is
+	begin
+		return to_integer(unsigned(V));
+	end;
+
+begin
+
+	-- Sequential process
+	-- It handles the Writes
+
+	process (clk)
+	begin
+		if rising_edge(clk) then
+
+			-- Write to the RAM
+			-- Note: there should be only one port.
+
+			if wa0_en = '1' then
+				ram( to_integer(wa0_addr) ) <= wa0_data;
+			end if;
+
+		end if;
+	end process;
+
+	-- The Read side (the outputs)
+
+	ra0_data <= ram( to_integer(ra0_addr) );
+
+end architecture;
-- 
cgit