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Diffstat (limited to 'testsuite/vests/vhdl-93/ashenden/compliant/ch_07_fg_07_11.vhd')
-rw-r--r-- | testsuite/vests/vhdl-93/ashenden/compliant/ch_07_fg_07_11.vhd | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/testsuite/vests/vhdl-93/ashenden/compliant/ch_07_fg_07_11.vhd b/testsuite/vests/vhdl-93/ashenden/compliant/ch_07_fg_07_11.vhd new file mode 100644 index 000000000..ff33899ee --- /dev/null +++ b/testsuite/vests/vhdl-93/ashenden/compliant/ch_07_fg_07_11.vhd @@ -0,0 +1,72 @@ + +-- 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_07_fg_07_11.vhd,v 1.2 2001-10-26 16:29:34 paw Exp $ +-- $Revision: 1.2 $ +-- +-- --------------------------------------------------------------------- + +entity fg_07_11 is +end entity fg_07_11; + + + +architecture test of fg_07_11 is + + subtype word32 is bit_vector(31 downto 0); + + -- code from book + + procedure increment ( a : inout word32; by : in word32 := X"0000_0001" ) is + variable sum : word32; + variable carry : bit := '0'; + begin + for index in a'reverse_range loop + sum(index) := a(index) xor by(index) xor carry; + carry := ( a(index) and by(index) ) or ( carry and ( a(index) xor by(index) ) ); + end loop; + a := sum; + end procedure increment; + + -- end code from book + +begin + + stimulus : process is + + variable count : word32 := X"0001_1100"; + + begin + + -- code from book (in text) + + increment(count, X"0000_0004"); + + increment(count); + + increment(count, by => open); + + -- end code from book + + wait; + end process stimulus; + +end architecture test; |