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jlechner |
------------------------------------------------------------------------------
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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 _ 4 6 --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2005, 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 2, 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. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
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-- Boston, MA 02110-1301, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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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 Unchecked_Conversion;
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package body System.Pack_46 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_46;
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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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Unchecked_Conversion (System.Address, Cluster_Ref);
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-- The following declarations are for the case where the address
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-- passed to GetU_46 or SetU_46 is not guaranteed to be aligned.
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-- These routines are used when the packed array is itself a
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-- component of a packed record, and therefore may not be aligned.
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type ClusterU is new Cluster;
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for ClusterU'Alignment use 1;
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type ClusterU_Ref is access ClusterU;
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function To_Ref is new
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Unchecked_Conversion (System.Address, ClusterU_Ref);
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------------
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-- Get_46 --
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------------
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function Get_46 (Arr : System.Address; N : Natural) return Bits_46 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_46;
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-------------
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-- GetU_46 --
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-------------
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function GetU_46 (Arr : System.Address; N : Natural) return Bits_46 is
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C : constant ClusterU_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 GetU_46;
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------------
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-- Set_46 --
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------------
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procedure Set_46 (Arr : System.Address; N : Natural; E : Bits_46) 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_46;
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-------------
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-- SetU_46 --
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-------------
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procedure SetU_46 (Arr : System.Address; N : Natural; E : Bits_46) is
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C : constant ClusterU_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 SetU_46;
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end System.Pack_46;
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