| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUN-TIME COMPONENTS -- |
| -- -- |
| -- S Y S T E M . P A C K _ 6 2 -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 1992-2021, 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; |
| |
| package body System.Pack_62 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_62; |
| 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; |
| |
| type Rev_Cluster is new Cluster |
| with Bit_Order => Reverse_Bit_Order, |
| Scalar_Storage_Order => Reverse_Bit_Order; |
| type Rev_Cluster_Ref is access Rev_Cluster; |
| |
| -- The following declarations are for the case where the address |
| -- passed to GetU_62 or SetU_62 is not guaranteed to be aligned. |
| -- These routines are used when the packed array is itself a |
| -- component of a packed record, and therefore may not be aligned. |
| |
| type ClusterU is new Cluster; |
| for ClusterU'Alignment use 1; |
| |
| type ClusterU_Ref is access ClusterU; |
| |
| type Rev_ClusterU is new ClusterU |
| with Bit_Order => Reverse_Bit_Order, |
| Scalar_Storage_Order => Reverse_Bit_Order; |
| type Rev_ClusterU_Ref is access Rev_ClusterU; |
| |
| ------------ |
| -- Get_62 -- |
| ------------ |
| |
| function Get_62 |
| (Arr : System.Address; |
| N : Natural; |
| Rev_SSO : Boolean) return Bits_62 |
| is |
| A : constant System.Address := Arr + Bits * Ofs (Uns (N) / 8); |
| C : Cluster_Ref with Address => A'Address, Import; |
| RC : Rev_Cluster_Ref with Address => A'Address, Import; |
| begin |
| if Rev_SSO then |
| case N07 (Uns (N) mod 8) is |
| when 0 => return RC.E0; |
| when 1 => return RC.E1; |
| when 2 => return RC.E2; |
| when 3 => return RC.E3; |
| when 4 => return RC.E4; |
| when 5 => return RC.E5; |
| when 6 => return RC.E6; |
| when 7 => return RC.E7; |
| end case; |
| |
| else |
| 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 if; |
| end Get_62; |
| |
| ------------- |
| -- GetU_62 -- |
| ------------- |
| |
| function GetU_62 |
| (Arr : System.Address; |
| N : Natural; |
| Rev_SSO : Boolean) return Bits_62 |
| is |
| A : constant System.Address := Arr + Bits * Ofs (Uns (N) / 8); |
| C : ClusterU_Ref with Address => A'Address, Import; |
| RC : Rev_ClusterU_Ref with Address => A'Address, Import; |
| begin |
| if Rev_SSO then |
| case N07 (Uns (N) mod 8) is |
| when 0 => return RC.E0; |
| when 1 => return RC.E1; |
| when 2 => return RC.E2; |
| when 3 => return RC.E3; |
| when 4 => return RC.E4; |
| when 5 => return RC.E5; |
| when 6 => return RC.E6; |
| when 7 => return RC.E7; |
| end case; |
| |
| else |
| 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 if; |
| end GetU_62; |
| |
| ------------ |
| -- Set_62 -- |
| ------------ |
| |
| procedure Set_62 |
| (Arr : System.Address; |
| N : Natural; |
| E : Bits_62; |
| Rev_SSO : Boolean) |
| is |
| A : constant System.Address := Arr + Bits * Ofs (Uns (N) / 8); |
| C : Cluster_Ref with Address => A'Address, Import; |
| RC : Rev_Cluster_Ref with Address => A'Address, Import; |
| 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_62; |
| |
| ------------- |
| -- SetU_62 -- |
| ------------- |
| |
| procedure SetU_62 |
| (Arr : System.Address; |
| N : Natural; |
| E : Bits_62; |
| Rev_SSO : Boolean) |
| is |
| A : constant System.Address := Arr + Bits * Ofs (Uns (N) / 8); |
| C : ClusterU_Ref with Address => A'Address, Import; |
| RC : Rev_ClusterU_Ref with Address => A'Address, Import; |
| 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 SetU_62; |
| |
| end System.Pack_62; |
