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-- Simple logic utilities for ieee.std_logic
-- Copyright (C) 2019 Tristan Gingold
--
-- This file is part of GHDL.
--
-- This program 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.
--
-- This program 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 this program. If not, see <gnu.org/licenses>.
with Types; use Types;
with Synth.Ieee.Std_Logic_1164; use Synth.Ieee.Std_Logic_1164;
package Synth.Ieee.Utils is
subtype Sl_01 is Std_Ulogic range '0' .. '1';
subtype Sl_X01 is Std_Ulogic range 'X' .. '1';
type Carry_Array is array (Sl_01, Sl_01, Sl_01) of Sl_01;
Compute_Carry : constant Carry_Array :=
('0' => ('0' => ('0' => '0', '1' => '0'),
'1' => ('0' => '0', '1' => '1')),
'1' => ('0' => ('0' => '0', '1' => '1'),
'1' => ('0' => '1', '1' => '1')));
Compute_Sum : constant Carry_Array :=
('0' => ('0' => ('0' => '0', '1' => '1'),
'1' => ('0' => '1', '1' => '0')),
'1' => ('0' => ('0' => '1', '1' => '0'),
'1' => ('0' => '0', '1' => '1')));
type Sl_To_X01_Array is array (Std_Ulogic) of Sl_X01;
Sl_To_X01 : constant Sl_To_X01_Array :=
('0' | 'L' => '0', '1' | 'H' => '1', others => 'X');
type Uns_To_01_Array is array (Uns64 range 0 .. 1) of Sl_X01;
Uns_To_01 : constant Uns_To_01_Array := (0 => '0', 1 => '1');
end Synth.Ieee.Utils;
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