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+--  GHDL Run Time (GRT) std_logic_1664 subprograms.
+--  Copyright (C) 2014 Tristan Gingold
+--
+--  GHDL 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, or (at your option) any later
+--  version.
+--
+--  GHDL 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 GCC; see the file COPYING.  If not, write to the Free
+--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+--  02111-1307, USA.
+--
+--  As a special exception, if other files instantiate generics from this
+--  unit, or you link this unit with other files to produce an executable,
+--  this unit does not by itself cause the resulting executable to be
+--  covered by the GNU General Public License. This exception does not
+--  however invalidate any other reasons why the executable file might be
+--  covered by the GNU Public License.
+
+with Grt.Types; use Grt.Types;
+
+package Grt.Std_Logic_1164 is
+   type Std_Ulogic is ('U', 'X', '0', '1', 'Z', 'W','L', 'H', '-');
+
+   type Stdlogic_Table_2d is array (Std_Ulogic, Std_Ulogic) of Std_Ulogic;
+   type Stdlogic_Table_1d is array (Std_Ulogic) of Std_Ulogic;
+
+   --  LRM08 9.2.3 Relational operators
+   Match_Eq_Table : constant Stdlogic_Table_2d :=
+     --UX01ZWLH-
+     ("UUUUUUUU1",
+      "UXXXXXXX1",
+      "UX10XX101",
+      "UX01XX011",
+      "UXXXXXXX1",
+      "UXXXXXXX1",
+      "UX10XX101",
+      "UX01XX011",
+      "111111111");
+
+   Match_Lt_Table : constant Stdlogic_Table_2d :=
+     --UX01ZWLH-
+     ("UUUUUUUUX",
+      "UXXXXXXXX",
+      "UX01XX01X",
+      "UX00XX00X",
+      "UXXXXXXXX",
+      "UXXXXXXXX",
+      "UX01XX01X",
+      "UX00XX00X",
+      "XXXXXXXXX");
+
+   And_Table : constant Stdlogic_Table_2d :=
+     --UX01ZWLH-
+     ("UU0UUU0UX",  -- U
+      "UX0XXX0XX",  -- X
+      "000000000",  -- 0
+      "UX01XX01X",  -- 1
+      "UX0XXX0XX",  -- Z
+      "UX0XXX0XX",  -- W
+      "000000000",  -- L
+      "UX01XX01X",  -- H
+      "UX0XXX0XX"); -- -
+
+   Or_Table : constant Stdlogic_Table_2d :=
+     --UX01ZWLH-
+     ("UUU1UUU1U",  -- U
+      "UXX1XXX1X",  -- X
+      "UX01XX01X",  -- 0
+      "111111111",  -- 1
+      "UXX1XXX1X",  -- Z
+      "UXX1XXX1X",  -- W
+      "UX01XX01X",  -- L
+      "111111111",  -- H
+      "UXX1XXX1X"); -- -
+
+   Xor_Table : constant Stdlogic_Table_2d :=
+     --UX01ZWLH-
+     ("UUUUUUUUU",  -- U
+      "UXXXXXXXX",  -- X
+      "UX01XX01X",  -- 0
+      "UX10XX10X",  -- 1
+      "UXXXXXXXX",  -- Z
+      "UXXXXXXXX",  -- W
+      "UX01XX01X",  -- L
+      "UX10XX10X",  -- H
+      "UXXXXXXXX"); -- -
+
+   Not_Table : constant Stdlogic_Table_1d := "UX10XX10X";
+
+   function Ghdl_Std_Ulogic_Match_Eq (L, R : Ghdl_E8) return Ghdl_E8;
+   function Ghdl_Std_Ulogic_Match_Ne (L, R : Ghdl_E8) return Ghdl_E8;
+   function Ghdl_Std_Ulogic_Match_Lt (L, R : Ghdl_E8) return Ghdl_E8;
+   function Ghdl_Std_Ulogic_Match_Le (L, R : Ghdl_E8) return Ghdl_E8;
+   --  For Gt and Ge, use Lt and Le with swapped parameters.
+private
+   pragma Export (C, Ghdl_Std_Ulogic_Match_Eq, "__ghdl_std_ulogic_match_eq");
+   pragma Export (C, Ghdl_Std_Ulogic_Match_Ne, "__ghdl_std_ulogic_match_ne");
+   pragma Export (C, Ghdl_Std_Ulogic_Match_Lt, "__ghdl_std_ulogic_match_lt");
+   pragma Export (C, Ghdl_Std_Ulogic_Match_Le, "__ghdl_std_ulogic_match_le");
+end Grt.Std_Logic_1164;