New Language: Ada

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45957 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 118 insertions, 0 deletions

diff --git a/gcc/ada/s-pack31.adb b/gcc/ada/s-pack31.adb
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+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT RUNTIME COMPONENTS                          --
+--                                                                          --
+--                       S Y S T E M . P A C K _ 3 1                        --
+--                                                                          --
+--                                 B o d y                                  --
+--                                                                          --
+--                            $Revision: 1.4 $
+--                                                                          --
+--          Copyright (C) 1992-1999 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 2,  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.  See the GNU General Public License --
+-- for  more details.  You should have  received  a copy of the GNU General --
+-- Public License  distributed with GNAT;  see 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.                                      --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
+--                                                                          --
+------------------------------------------------------------------------------
+
+with System.Storage_Elements;
+with System.Unsigned_Types;
+with 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
+     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;