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Diffstat (limited to 'testsuite/vests/vhdl-93/ashenden/compliant/ch_10_chkmult.vhd')
-rw-r--r-- | testsuite/vests/vhdl-93/ashenden/compliant/ch_10_chkmult.vhd | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/testsuite/vests/vhdl-93/ashenden/compliant/ch_10_chkmult.vhd b/testsuite/vests/vhdl-93/ashenden/compliant/ch_10_chkmult.vhd new file mode 100644 index 000000000..588a0feae --- /dev/null +++ b/testsuite/vests/vhdl-93/ashenden/compliant/ch_10_chkmult.vhd @@ -0,0 +1,65 @@ + +-- 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; |