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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- S Y S T E M . P A C K _ 8 1 --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2024, 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.Address_To_Access_Conversions;
with System.Storage_Elements;
with System.Unsigned_Types;
package body System.Pack_81 is
subtype Bit_Order is System.Bit_Order;
Reverse_Bit_Order : constant Bit_Order :=
Bit_Order'Val (1 - Bit_Order'Pos (System.Default_Bit_Order));
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_81;
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.
package AAC is new Address_To_Access_Conversions (Cluster);
-- We convert addresses to access values and dereference them instead of
-- directly using overlays in order to work around the implementation of
-- the RM 13.3(19) clause, which would pessimize the generated code.
type Rev_Cluster is new Cluster
with Bit_Order => Reverse_Bit_Order,
Scalar_Storage_Order => Reverse_Bit_Order;
package Rev_AAC is new Address_To_Access_Conversions (Rev_Cluster);
------------
-- Get_81 --
------------
function Get_81
(Arr : System.Address;
N : Natural;
Rev_SSO : Boolean) return Bits_81
is
A : constant System.Address := Arr + Bits * Ofs (Uns (N) / 8);
C : constant AAC.Object_Pointer := AAC.To_Pointer (A);
RC : constant Rev_AAC.Object_Pointer := Rev_AAC.To_Pointer (A);
begin
return
(if Rev_SSO then
(case N07 (Uns (N) mod 8) is
when 0 => RC.E0,
when 1 => RC.E1,
when 2 => RC.E2,
when 3 => RC.E3,
when 4 => RC.E4,
when 5 => RC.E5,
when 6 => RC.E6,
when 7 => RC.E7)
else
(case N07 (Uns (N) mod 8) is
when 0 => C.E0,
when 1 => C.E1,
when 2 => C.E2,
when 3 => C.E3,
when 4 => C.E4,
when 5 => C.E5,
when 6 => C.E6,
when 7 => C.E7)
);
end Get_81;
------------
-- Set_81 --
------------
procedure Set_81
(Arr : System.Address;
N : Natural;
E : Bits_81;
Rev_SSO : Boolean)
is
A : constant System.Address := Arr + Bits * Ofs (Uns (N) / 8);
C : constant AAC.Object_Pointer := AAC.To_Pointer (A);
RC : constant Rev_AAC.Object_Pointer := Rev_AAC.To_Pointer (A);
begin
if Rev_SSO then
case N07 (Uns (N) mod 8) is
when 0 => RC.E0 := E;
when 1 => RC.E1 := E;
when 2 => RC.E2 := E;
when 3 => RC.E3 := E;
when 4 => RC.E4 := E;
when 5 => RC.E5 := E;
when 6 => RC.E6 := E;
when 7 => RC.E7 := E;
end case;
else
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 if;
end Set_81;
end System.Pack_81;
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