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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_10_chkmult.vhd,v 1.3 2001-10-26 16:29:35 paw Exp $
+-- $Revision: 1.3 $
+--
+-- ---------------------------------------------------------------------
+
+entity check_mult is
+end entity check_mult;
+
+library bv_utilities;
+use bv_utilities.bv_arithmetic.all;
+
+architecture behav of check_mult is
+
+begin
+
+ checker : process is
+
+ variable bv_a, bv_b, bv_product : bit_vector(3 downto 0);
+ variable overflow : boolean;
+
+ begin
+ for a in 0 to 15 loop
+ for b in 0 to 15 loop
+ bv_a := natural_to_bv(a, bv_a'length);
+ bv_b := natural_to_bv(b, bv_b'length);
+ bv_multu(bv_a, bv_b, bv_product, overflow);
+ if a * b > 15 then
+ assert overflow
+ report integer'image(a) & '*' & integer'image(b)
+ & ": overflow not true";
+ else
+ assert not overflow
+ report integer'image(a) & '*' & integer'image(b)
+ & ": overflow not false";
+ assert bv_to_natural(bv_product) = a * b
+ report integer'image(a) & '*' & integer'image(b)
+ & ": product = " & integer'image(bv_to_natural(bv_product));
+ end if;
+ end loop;
+ end loop;
+ wait;
+ end process checker;
+
+end architecture behav;