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Diffstat (limited to 'testsuite/vests/vhdl-93/ashenden/compliant/ch_10_alu-b.vhd')
| -rw-r--r-- | testsuite/vests/vhdl-93/ashenden/compliant/ch_10_alu-b.vhd | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/testsuite/vests/vhdl-93/ashenden/compliant/ch_10_alu-b.vhd b/testsuite/vests/vhdl-93/ashenden/compliant/ch_10_alu-b.vhd new file mode 100644 index 000000000..ff9d5c851 --- /dev/null +++ b/testsuite/vests/vhdl-93/ashenden/compliant/ch_10_alu-b.vhd @@ -0,0 +1,67 @@ + +-- 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_alu-b.vhd,v 1.3 2001-10-26 16:29:34 paw Exp $ +-- $Revision: 1.3 $ +-- +-- --------------------------------------------------------------------- + +library bv_utilities; +use bv_utilities.bv_arithmetic.all; + +architecture behavior of alu is +begin + + alu_op: process (s1, s2, func) is + + constant Tpd : delay_length := 10 ns; + + variable bv_s1 : bit_vector(s1'range) := To_bitvector(s1); + variable bv_s2 : bit_vector(s2'range) := To_bitvector(s2); + variable temp_result : bit_vector(result'range); + constant zero_result : bit_vector(result'range) := (others => '0'); + variable temp_overflow : boolean; + + type boolean_to_X01_table is array (boolean) of X01; + constant boolean_to_X01 : boolean_to_X01_table + := ( false => '0', true => '1' ); + + begin + case func is + when alu_add => + bv_add(bv_s1, bv_s2, temp_result, temp_overflow); + when alu_addu => + bv_addu(bv_s1, bv_s2, temp_result, temp_overflow); + when alu_sub => + bv_sub(bv_s1, bv_s2, temp_result, temp_overflow); + when alu_subu => + bv_subu(bv_s1, bv_s2, temp_result, temp_overflow); + when others => + report "alu: illegal function code" severity error; + temp_result := X"0000_0000"; + end case; + result <= To_X01(temp_result) after Tpd; + zero <= boolean_to_X01(temp_result = zero_result) after Tpd; + negative <= To_X01(temp_result(temp_result'left)) after Tpd; + overflow <= boolean_to_X01(temp_overflow) after Tpd; + end process alu_op; + +end architecture behavior; |