Import vests testsuite

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diff --git a/testsuite/vests/vhdl-93/ashenden/compliant/ch_06_acca-b.vhd b/testsuite/vests/vhdl-93/ashenden/compliant/ch_06_acca-b.vhd
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+
+-- Copyright (C) 1996 Morgan Kaufmann Publishers, Inc
+
+-- This file is part of VESTs (Vhdl tESTs).
+
+-- VESTs is free software; you can redistribute it and/or modify it
+-- under the terms of the GNU General Public License as published by the
+-- Free Software Foundation; either version 2 of the License, or (at
+-- your option) any later version. 
+
+-- VESTs is distributed in the hope that it will be useful, but WITHOUT
+-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+-- FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+-- for more details. 
+
+-- You should have received a copy of the GNU General Public License
+-- along with VESTs; if not, write to the Free Software Foundation,
+-- Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
+
+-- ---------------------------------------------------------------------
+--
+-- $Id: ch_06_acca-b.vhd,v 1.2 2001-10-26 16:29:34 paw Exp $
+-- $Revision: 1.2 $
+--
+-- ---------------------------------------------------------------------
+
+architecture behavioral of accumulator_adder is
+begin
+
+  behavior : process (a, b) is
+
+                              constant Tpd_in_out : time := 3 ns;
+                            variable carry_in : std_ulogic;
+                            variable carry_out : std_ulogic := '0';
+
+  begin
+    for index in 0 to 21 loop
+      carry_in := carry_out;  -- of previous bit
+      s(index) <= a(index) xor b(index) xor carry_in after Tpd_in_out;
+      carry_out := (a(index) and b(index))
+      	      	   or (carry_in and (a(index) xor b(index)));
+    end loop;
+    ovf <= carry_out xor carry_in after Tpd_in_out;  -- ovf is carry_out /= carry_in
+  end process behavior;
+
+end architecture behavioral;