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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;