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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_08_fg_08_08.vhd,v 1.3 2001-10-26 16:29:34 paw Exp $
+-- $Revision: 1.3 $
+--
+-- ---------------------------------------------------------------------
+
+package bit_vector_signed_arithmetic is
+
+ function "+" ( bv1, bv2 : bit_vector ) return bit_vector;
+
+ function "-" ( bv : bit_vector ) return bit_vector;
+
+ function "*" ( bv1, bv2 : bit_vector ) return bit_vector;
+
+ -- . . .
+
+end package bit_vector_signed_arithmetic;
+
+-- not in book
+library bv_utilities;
+use bv_utilities.bv_arithmetic;
+-- end not in book
+
+package body bit_vector_signed_arithmetic is
+
+ function "+" ( bv1, bv2 : bit_vector ) return bit_vector is -- . . .
+ -- not in book
+ begin
+ return bv_arithmetic."+"(bv1, bv2);
+ end function "+";
+ -- end not in book
+
+ function "-" ( bv : bit_vector ) return bit_vector is -- . . .
+ -- not in book
+ begin
+ return bv_arithmetic."-"(bv);
+ end function "-";
+ -- end not in book
+
+ function mult_unsigned ( bv1, bv2 : bit_vector ) return bit_vector is
+ -- . . .
+ begin
+ -- not in book
+ -- . . .
+ return bv_arithmetic.bv_multu(bv1, bv2);
+ -- end not in book
+ end function mult_unsigned;
+
+ function "*" ( bv1, bv2 : bit_vector ) return bit_vector is
+ begin
+ if bv1(bv1'left) = '0' and bv2(bv2'left) = '0' then
+ return mult_unsigned(bv1, bv2);
+ elsif bv1(bv1'left) = '0' and bv2(bv2'left) = '1' then
+ return -mult_unsigned(bv1, -bv2);
+ elsif bv1(bv1'left) = '1' and bv2(bv2'left) = '0' then
+ return -mult_unsigned(-bv1, bv2);
+ else
+ return mult_unsigned(-bv1, -bv2);
+ end if;
+ end function "*";
+
+ -- . . .
+
+end package body bit_vector_signed_arithmetic;
+
+-- not in book
+
+entity fg_08_08 is
+end entity fg_08_08;
+
+library bv_utilities;
+use bv_utilities.bit_vector_signed_arithmetic.all;
+
+use std.textio.all;
+
+architecture test of fg_08_08 is
+begin
+
+ stimulus : process is
+ variable L : line;
+ begin
+ write(L, X"0002" + X"0005");
+ writeline(output, L);
+ write(L, X"0002" + X"FFFE");
+ writeline(output, L);
+ write(L, - X"0005");
+ writeline(output, L);
+ write(L, - X"FFFE");
+ writeline(output, L);
+ write(L, X"0002" * X"0005");
+ writeline(output, L);
+ write(L, X"0002" * X"FFFD");
+ writeline(output, L);
+
+ wait;
+ end process stimulus;
+
+end architecture test;
+
+-- end not in book