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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [ada/] [s-pack61.adb] - Blame information for rev 706

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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT RUN-TIME COMPONENTS                         --
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--                                                                          --
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--                       S Y S T E M . P A C K _ 6 1                        --
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--                                                                          --
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--                                 B o d y                                  --
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--                                                                          --
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--          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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with System.Storage_Elements;
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with System.Unsigned_Types;
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with Ada.Unchecked_Conversion;
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package body System.Pack_61 is
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   subtype Ofs is System.Storage_Elements.Storage_Offset;
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   subtype Uns is System.Unsigned_Types.Unsigned;
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   subtype N07 is System.Unsigned_Types.Unsigned range 0 .. 7;
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   use type System.Storage_Elements.Storage_Offset;
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   use type System.Unsigned_Types.Unsigned;
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   type Cluster is record
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      E0, E1, E2, E3, E4, E5, E6, E7 : Bits_61;
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   end record;
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   for Cluster use record
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      E0 at 0 range 0 * Bits .. 0 * Bits + Bits - 1;
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      E1 at 0 range 1 * Bits .. 1 * Bits + Bits - 1;
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      E2 at 0 range 2 * Bits .. 2 * Bits + Bits - 1;
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      E3 at 0 range 3 * Bits .. 3 * Bits + Bits - 1;
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      E4 at 0 range 4 * Bits .. 4 * Bits + Bits - 1;
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      E5 at 0 range 5 * Bits .. 5 * Bits + Bits - 1;
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      E6 at 0 range 6 * Bits .. 6 * Bits + Bits - 1;
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      E7 at 0 range 7 * Bits .. 7 * Bits + Bits - 1;
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   end record;
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   for Cluster'Size use Bits * 8;
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   for Cluster'Alignment use Integer'Min (Standard'Maximum_Alignment,
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     1 +
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     1 * Boolean'Pos (Bits mod 2 = 0) +
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     2 * Boolean'Pos (Bits mod 4 = 0));
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   --  Use maximum possible alignment, given the bit field size, since this
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   --  will result in the most efficient code possible for the field.
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   type Cluster_Ref is access Cluster;
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   function To_Ref is new
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     Ada.Unchecked_Conversion (System.Address, Cluster_Ref);
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   ------------
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   -- Get_61 --
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   ------------
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   function Get_61 (Arr : System.Address; N : Natural) return Bits_61 is
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      C : constant Cluster_Ref := To_Ref (Arr + Bits * Ofs (Uns (N) / 8));
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   begin
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      case N07 (Uns (N) mod 8) is
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         when 0 => return C.E0;
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         when 1 => return C.E1;
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         when 2 => return C.E2;
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         when 3 => return C.E3;
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         when 4 => return C.E4;
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         when 5 => return C.E5;
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         when 6 => return C.E6;
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         when 7 => return C.E7;
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      end case;
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   end Get_61;
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   ------------
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   -- Set_61 --
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   ------------
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   procedure Set_61 (Arr : System.Address; N : Natural; E : Bits_61) is
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      C : constant Cluster_Ref := To_Ref (Arr + Bits * Ofs (Uns (N) / 8));
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   begin
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      case N07 (Uns (N) mod 8) is
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         when 0 => C.E0 := E;
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         when 1 => C.E1 := E;
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         when 2 => C.E2 := E;
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         when 3 => C.E3 := E;
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         when 4 => C.E4 := E;
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         when 5 => C.E5 := E;
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         when 6 => C.E6 := E;
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         when 7 => C.E7 := E;
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      end case;
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   end Set_61;
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end System.Pack_61;

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