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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- S Y S T E M . P A C K _ 3 1 --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
+-- --
+-- GNAT is free software; you can redistribute it and/or modify it under --
+-- terms of the GNU General Public License as published by the Free Soft- --
+-- ware Foundation; either version 3, or (at your option) any later ver- --
+-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+with System.Storage_Elements;
+with System.Unsigned_Types;
+with Ada.Unchecked_Conversion;
+
+package body System.Pack_31 is
+
+ subtype Ofs is System.Storage_Elements.Storage_Offset;
+ subtype Uns is System.Unsigned_Types.Unsigned;
+ subtype N07 is System.Unsigned_Types.Unsigned range 0 .. 7;
+
+ use type System.Storage_Elements.Storage_Offset;
+ use type System.Unsigned_Types.Unsigned;
+
+ type Cluster is record
+ E0, E1, E2, E3, E4, E5, E6, E7 : Bits_31;
+ end record;
+
+ for Cluster use record
+ E0 at 0 range 0 * Bits .. 0 * Bits + Bits - 1;
+ E1 at 0 range 1 * Bits .. 1 * Bits + Bits - 1;
+ E2 at 0 range 2 * Bits .. 2 * Bits + Bits - 1;
+ E3 at 0 range 3 * Bits .. 3 * Bits + Bits - 1;
+ E4 at 0 range 4 * Bits .. 4 * Bits + Bits - 1;
+ E5 at 0 range 5 * Bits .. 5 * Bits + Bits - 1;
+ E6 at 0 range 6 * Bits .. 6 * Bits + Bits - 1;
+ E7 at 0 range 7 * Bits .. 7 * Bits + Bits - 1;
+ end record;
+
+ for Cluster'Size use Bits * 8;
+
+ for Cluster'Alignment use Integer'Min (Standard'Maximum_Alignment,
+ 1 +
+ 1 * Boolean'Pos (Bits mod 2 = 0) +
+ 2 * Boolean'Pos (Bits mod 4 = 0));
+ -- Use maximum possible alignment, given the bit field size, since this
+ -- will result in the most efficient code possible for the field.
+
+ type Cluster_Ref is access Cluster;
+
+ function To_Ref is new
+ Ada.Unchecked_Conversion (System.Address, Cluster_Ref);
+
+ ------------
+ -- Get_31 --
+ ------------
+
+ function Get_31 (Arr : System.Address; N : Natural) return Bits_31 is
+ C : constant Cluster_Ref := To_Ref (Arr + Bits * Ofs (Uns (N) / 8));
+ begin
+ case N07 (Uns (N) mod 8) is
+ when 0 => return C.E0;
+ when 1 => return C.E1;
+ when 2 => return C.E2;
+ when 3 => return C.E3;
+ when 4 => return C.E4;
+ when 5 => return C.E5;
+ when 6 => return C.E6;
+ when 7 => return C.E7;
+ end case;
+ end Get_31;
+
+ ------------
+ -- Set_31 --
+ ------------
+
+ procedure Set_31 (Arr : System.Address; N : Natural; E : Bits_31) is
+ C : constant Cluster_Ref := To_Ref (Arr + Bits * Ofs (Uns (N) / 8));
+ begin
+ case N07 (Uns (N) mod 8) is
+ when 0 => C.E0 := E;
+ when 1 => C.E1 := E;
+ when 2 => C.E2 := E;
+ when 3 => C.E3 := E;
+ when 4 => C.E4 := E;
+ when 5 => C.E5 := E;
+ when 6 => C.E6 := E;
+ when 7 => C.E7 := E;
+ end case;
+ end Set_31;
+
+end System.Pack_31;