| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUN-TIME COMPONENTS -- |
| -- -- |
| -- S Y S T E M . P A C K _ 6 7 -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 1992-2025, 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_67 is |
| |
| -- The high-level idea of the implementation is to overlay a record |
| -- containing components of the same size as that of the component |
| -- of the array, in order words 67 bits, and to access the indexed |
| -- component of the array through the appropriate selected component |
| -- of the record. |
| |
| -- The record must be of a fixed size for technical reasons, so we |
| -- effectively overlay a series of contiguous records containing 8 |
| -- components (so that their size in bits is a multiple of a byte) |
| -- at the start of the array and access the component in the last |
| -- of them. However, this component in the last record may also be |
| -- mapped to the last component of the array, which means that the |
| -- generated code cannot safely access past it (or its last byte). |
| -- That's why the last record of the series is shortened, so the |
| -- accessed component is always the last component of the record. |
| |
| -- A (0) A (N) |
| -- | | |
| -- V V |
| -- --------------------------------------------------------------- |
| -- | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| -- --------------------------------------------------------------- |
| -- |
| -- component K |
| -- | |
| -- V |
| -- --------------------------------------------------------- |
| -- | | | | | |
| -- --------------------------------------------------------- |
| -- | | | | |
| -- Cluster7 Cluster7 Cluster7 ClusterK |
| -- |
| -- where the number of Cluster7 is N / 8 and K is N mod 8. |
| |
| 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; |
| |
| -------------- |
| -- Cluster0 -- |
| -------------- |
| |
| type Cluster0 is record |
| E0 : Bits_67; |
| end record; |
| |
| for Cluster0 use record |
| E0 at 0 range 0 * Bits .. 0 * Bits + Bits - 1; |
| end record; |
| |
| for Cluster0'Size use Bits * (1 + 0); |
| |
| for Cluster0'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 AAC0 is new Address_To_Access_Conversions (Cluster0); |
| -- 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_Cluster0 is new Cluster0 |
| with Bit_Order => Reverse_Bit_Order, |
| Scalar_Storage_Order => Reverse_Bit_Order; |
| |
| package Rev_AAC0 is new Address_To_Access_Conversions (Rev_Cluster0); |
| |
| -------------- |
| -- Cluster1 -- |
| -------------- |
| |
| type Cluster1 is record |
| E0, E1 : Bits_67; |
| end record; |
| |
| for Cluster1 use record |
| E0 at 0 range 0 * Bits .. 0 * Bits + Bits - 1; |
| E1 at 0 range 1 * Bits .. 1 * Bits + Bits - 1; |
| end record; |
| |
| for Cluster1'Size use Bits * (1 + 1); |
| |
| for Cluster1'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 AAC1 is new Address_To_Access_Conversions (Cluster1); |
| -- 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_Cluster1 is new Cluster1 |
| with Bit_Order => Reverse_Bit_Order, |
| Scalar_Storage_Order => Reverse_Bit_Order; |
| |
| package Rev_AAC1 is new Address_To_Access_Conversions (Rev_Cluster1); |
| |
| -------------- |
| -- Cluster2 -- |
| -------------- |
| |
| type Cluster2 is record |
| E0, E1, E2 : Bits_67; |
| end record; |
| |
| for Cluster2 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; |
| end record; |
| |
| for Cluster2'Size use Bits * (1 + 2); |
| |
| for Cluster2'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 AAC2 is new Address_To_Access_Conversions (Cluster2); |
| -- 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_Cluster2 is new Cluster2 |
| with Bit_Order => Reverse_Bit_Order, |
| Scalar_Storage_Order => Reverse_Bit_Order; |
| |
| package Rev_AAC2 is new Address_To_Access_Conversions (Rev_Cluster2); |
| |
| -------------- |
| -- Cluster3 -- |
| -------------- |
| |
| type Cluster3 is record |
| E0, E1, E2, E3 : Bits_67; |
| end record; |
| |
| for Cluster3 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; |
| end record; |
| |
| for Cluster3'Size use Bits * (1 + 3); |
| |
| for Cluster3'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 AAC3 is new Address_To_Access_Conversions (Cluster3); |
| -- 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_Cluster3 is new Cluster3 |
| with Bit_Order => Reverse_Bit_Order, |
| Scalar_Storage_Order => Reverse_Bit_Order; |
| |
| package Rev_AAC3 is new Address_To_Access_Conversions (Rev_Cluster3); |
| |
| -------------- |
| -- Cluster4 -- |
| -------------- |
| |
| type Cluster4 is record |
| E0, E1, E2, E3, E4 : Bits_67; |
| end record; |
| |
| for Cluster4 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; |
| end record; |
| |
| for Cluster4'Size use Bits * (1 + 4); |
| |
| for Cluster4'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 AAC4 is new Address_To_Access_Conversions (Cluster4); |
| -- 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_Cluster4 is new Cluster4 |
| with Bit_Order => Reverse_Bit_Order, |
| Scalar_Storage_Order => Reverse_Bit_Order; |
| |
| package Rev_AAC4 is new Address_To_Access_Conversions (Rev_Cluster4); |
| |
| -------------- |
| -- Cluster5 -- |
| -------------- |
| |
| type Cluster5 is record |
| E0, E1, E2, E3, E4, E5 : Bits_67; |
| end record; |
| |
| for Cluster5 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; |
| end record; |
| |
| for Cluster5'Size use Bits * (1 + 5); |
| |
| for Cluster5'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 AAC5 is new Address_To_Access_Conversions (Cluster5); |
| -- 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_Cluster5 is new Cluster5 |
| with Bit_Order => Reverse_Bit_Order, |
| Scalar_Storage_Order => Reverse_Bit_Order; |
| |
| package Rev_AAC5 is new Address_To_Access_Conversions (Rev_Cluster5); |
| |
| -------------- |
| -- Cluster6 -- |
| -------------- |
| |
| type Cluster6 is record |
| E0, E1, E2, E3, E4, E5, E6 : Bits_67; |
| end record; |
| |
| for Cluster6 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; |
| end record; |
| |
| for Cluster6'Size use Bits * (1 + 6); |
| |
| for Cluster6'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 AAC6 is new Address_To_Access_Conversions (Cluster6); |
| -- 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_Cluster6 is new Cluster6 |
| with Bit_Order => Reverse_Bit_Order, |
| Scalar_Storage_Order => Reverse_Bit_Order; |
| |
| package Rev_AAC6 is new Address_To_Access_Conversions (Rev_Cluster6); |
| |
| -------------- |
| -- Cluster7 -- |
| -------------- |
| |
| type Cluster7 is record |
| E0, E1, E2, E3, E4, E5, E6, E7 : Bits_67; |
| end record; |
| |
| for Cluster7 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 Cluster7'Size use Bits * (1 + 7); |
| |
| for Cluster7'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 AAC7 is new Address_To_Access_Conversions (Cluster7); |
| -- 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_Cluster7 is new Cluster7 |
| with Bit_Order => Reverse_Bit_Order, |
| Scalar_Storage_Order => Reverse_Bit_Order; |
| |
| package Rev_AAC7 is new Address_To_Access_Conversions (Rev_Cluster7); |
| |
| ------------ |
| -- Get_67 -- |
| ------------ |
| |
| function Get_67 |
| (Arr : System.Address; |
| N : Natural; |
| Rev_SSO : Boolean) return Bits_67 |
| is |
| A : constant System.Address := Arr + Bits * Ofs (Uns (N) / 8); |
| C0 : constant AAC0.Object_Pointer := AAC0.To_Pointer (A); |
| C1 : constant AAC1.Object_Pointer := AAC1.To_Pointer (A); |
| C2 : constant AAC2.Object_Pointer := AAC2.To_Pointer (A); |
| C3 : constant AAC3.Object_Pointer := AAC3.To_Pointer (A); |
| C4 : constant AAC4.Object_Pointer := AAC4.To_Pointer (A); |
| C5 : constant AAC5.Object_Pointer := AAC5.To_Pointer (A); |
| C6 : constant AAC6.Object_Pointer := AAC6.To_Pointer (A); |
| C7 : constant AAC7.Object_Pointer := AAC7.To_Pointer (A); |
| RC0 : constant Rev_AAC0.Object_Pointer := Rev_AAC0.To_Pointer (A); |
| RC1 : constant Rev_AAC1.Object_Pointer := Rev_AAC1.To_Pointer (A); |
| RC2 : constant Rev_AAC2.Object_Pointer := Rev_AAC2.To_Pointer (A); |
| RC3 : constant Rev_AAC3.Object_Pointer := Rev_AAC3.To_Pointer (A); |
| RC4 : constant Rev_AAC4.Object_Pointer := Rev_AAC4.To_Pointer (A); |
| RC5 : constant Rev_AAC5.Object_Pointer := Rev_AAC5.To_Pointer (A); |
| RC6 : constant Rev_AAC6.Object_Pointer := Rev_AAC6.To_Pointer (A); |
| RC7 : constant Rev_AAC7.Object_Pointer := Rev_AAC7.To_Pointer (A); |
| |
| begin |
| return |
| (if Rev_SSO then |
| (case N07 (Uns (N) mod 8) is |
| when 0 => RC0.E0, |
| when 1 => RC1.E1, |
| when 2 => RC2.E2, |
| when 3 => RC3.E3, |
| when 4 => RC4.E4, |
| when 5 => RC5.E5, |
| when 6 => RC6.E6, |
| when 7 => RC7.E7) |
| |
| else |
| (case N07 (Uns (N) mod 8) is |
| when 0 => C0.E0, |
| when 1 => C1.E1, |
| when 2 => C2.E2, |
| when 3 => C3.E3, |
| when 4 => C4.E4, |
| when 5 => C5.E5, |
| when 6 => C6.E6, |
| when 7 => C7.E7) |
| ); |
| end Get_67; |
| |
| ------------ |
| -- Set_67 -- |
| ------------ |
| |
| procedure Set_67 |
| (Arr : System.Address; |
| N : Natural; |
| E : Bits_67; |
| Rev_SSO : Boolean) |
| is |
| A : constant System.Address := Arr + Bits * Ofs (Uns (N) / 8); |
| C0 : constant AAC0.Object_Pointer := AAC0.To_Pointer (A); |
| C1 : constant AAC1.Object_Pointer := AAC1.To_Pointer (A); |
| C2 : constant AAC2.Object_Pointer := AAC2.To_Pointer (A); |
| C3 : constant AAC3.Object_Pointer := AAC3.To_Pointer (A); |
| C4 : constant AAC4.Object_Pointer := AAC4.To_Pointer (A); |
| C5 : constant AAC5.Object_Pointer := AAC5.To_Pointer (A); |
| C6 : constant AAC6.Object_Pointer := AAC6.To_Pointer (A); |
| C7 : constant AAC7.Object_Pointer := AAC7.To_Pointer (A); |
| RC0 : constant Rev_AAC0.Object_Pointer := Rev_AAC0.To_Pointer (A); |
| RC1 : constant Rev_AAC1.Object_Pointer := Rev_AAC1.To_Pointer (A); |
| RC2 : constant Rev_AAC2.Object_Pointer := Rev_AAC2.To_Pointer (A); |
| RC3 : constant Rev_AAC3.Object_Pointer := Rev_AAC3.To_Pointer (A); |
| RC4 : constant Rev_AAC4.Object_Pointer := Rev_AAC4.To_Pointer (A); |
| RC5 : constant Rev_AAC5.Object_Pointer := Rev_AAC5.To_Pointer (A); |
| RC6 : constant Rev_AAC6.Object_Pointer := Rev_AAC6.To_Pointer (A); |
| RC7 : constant Rev_AAC7.Object_Pointer := Rev_AAC7.To_Pointer (A); |
| |
| begin |
| if Rev_SSO then |
| case N07 (Uns (N) mod 8) is |
| when 0 => RC0.E0 := E; |
| when 1 => RC1.E1 := E; |
| when 2 => RC2.E2 := E; |
| when 3 => RC3.E3 := E; |
| when 4 => RC4.E4 := E; |
| when 5 => RC5.E5 := E; |
| when 6 => RC6.E6 := E; |
| when 7 => RC7.E7 := E; |
| end case; |
| else |
| case N07 (Uns (N) mod 8) is |
| when 0 => C0.E0 := E; |
| when 1 => C1.E1 := E; |
| when 2 => C2.E2 := E; |
| when 3 => C3.E3 := E; |
| when 4 => C4.E4 := E; |
| when 5 => C5.E5 := E; |
| when 6 => C6.E6 := E; |
| when 7 => C7.E7 := E; |
| end case; |
| end if; |
| end Set_67; |
| |
| end System.Pack_67; |
