projects / thirdparty / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| cacbc350 RK |
1 | ------------------------------------------------------------------------------ |
| 2 | -- -- | |
| 3 | -- GNAT RUNTIME COMPONENTS -- | |
| 4 | -- -- | |
| 5 | -- S Y S T E M . P A C K _ 1 5 -- | |
| 6 | -- -- | |
| 7 | -- B o d y -- | |
| 8 | -- -- | |
| cacbc350 RK |
9 | -- -- |
| 10 | -- Copyright (C) 1992-1999 Free Software Foundation, Inc. -- | |
| 11 | -- -- | |
| 12 | -- GNAT is free software; you can redistribute it and/or modify it under -- | |
| 13 | -- terms of the GNU General Public License as published by the Free Soft- -- | |
| 14 | -- ware Foundation; either version 2, or (at your option) any later ver- -- | |
| 15 | -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- | |
| 16 | -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- | |
| 17 | -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- | |
| 18 | -- for more details. You should have received a copy of the GNU General -- | |
| 19 | -- Public License distributed with GNAT; see file COPYING. If not, write -- | |
| 20 | -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- | |
| 21 | -- MA 02111-1307, USA. -- | |
| 22 | -- -- | |
| 23 | -- As a special exception, if other files instantiate generics from this -- | |
| 24 | -- unit, or you link this unit with other files to produce an executable, -- | |
| 25 | -- this unit does not by itself cause the resulting executable to be -- | |
| 26 | -- covered by the GNU General Public License. This exception does not -- | |
| 27 | -- however invalidate any other reasons why the executable file might be -- | |
| 28 | -- covered by the GNU Public License. -- | |
| 29 | -- -- | |
| 30 | -- GNAT was originally developed by the GNAT team at New York University. -- | |
| 31 | -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). -- | |
| 32 | -- -- | |
| 33 | ------------------------------------------------------------------------------ | |
| 34 | ||
| 35 | with System.Storage_Elements; | |
| 36 | with System.Unsigned_Types; | |
| 37 | with Unchecked_Conversion; | |
| 38 | ||
| 39 | package body System.Pack_15 is | |
| 40 | ||
| 41 | subtype Ofs is System.Storage_Elements.Storage_Offset; | |
| 42 | subtype Uns is System.Unsigned_Types.Unsigned; | |
| 43 | subtype N07 is System.Unsigned_Types.Unsigned range 0 .. 7; | |
| 44 | ||
| 45 | use type System.Storage_Elements.Storage_Offset; | |
| 46 | use type System.Unsigned_Types.Unsigned; | |
| 47 | ||
| 48 | type Cluster is record | |
| 49 | E0, E1, E2, E3, E4, E5, E6, E7 : Bits_15; | |
| 50 | end record; | |
| 51 | ||
| 52 | for Cluster use record | |
| 53 | E0 at 0 range 0 * Bits .. 0 * Bits + Bits - 1; | |
| 54 | E1 at 0 range 1 * Bits .. 1 * Bits + Bits - 1; | |
| 55 | E2 at 0 range 2 * Bits .. 2 * Bits + Bits - 1; | |
| 56 | E3 at 0 range 3 * Bits .. 3 * Bits + Bits - 1; | |
| 57 | E4 at 0 range 4 * Bits .. 4 * Bits + Bits - 1; | |
| 58 | E5 at 0 range 5 * Bits .. 5 * Bits + Bits - 1; | |
| 59 | E6 at 0 range 6 * Bits .. 6 * Bits + Bits - 1; | |
| 60 | E7 at 0 range 7 * Bits .. 7 * Bits + Bits - 1; | |
| 61 | end record; | |
| 62 | ||
| 63 | for Cluster'Size use Bits * 8; | |
| 64 | ||
| 65 | for Cluster'Alignment use Integer'Min (Standard'Maximum_Alignment, | |
| 66 | 1 + | |
| 67 | 1 * Boolean'Pos (Bits mod 2 = 0) + | |
| 68 | 2 * Boolean'Pos (Bits mod 4 = 0)); | |
| 69 | -- Use maximum possible alignment, given the bit field size, since this | |
| 70 | -- will result in the most efficient code possible for the field. | |
| 71 | ||
| 72 | type Cluster_Ref is access Cluster; | |
| 73 | ||
| 74 | function To_Ref is new | |
| 75 | Unchecked_Conversion (System.Address, Cluster_Ref); | |
| 76 | ||
| 77 | ------------ | |
| 78 | -- Get_15 -- | |
| 79 | ------------ | |
| 80 | ||
| 81 | function Get_15 (Arr : System.Address; N : Natural) return Bits_15 is | |
| 82 | C : constant Cluster_Ref := To_Ref (Arr + Bits * Ofs (Uns (N) / 8)); | |
| 83 | ||
| 84 | begin | |
| 85 | case N07 (Uns (N) mod 8) is | |
| 86 | when 0 => return C.E0; | |
| 87 | when 1 => return C.E1; | |
| 88 | when 2 => return C.E2; | |
| 89 | when 3 => return C.E3; | |
| 90 | when 4 => return C.E4; | |
| 91 | when 5 => return C.E5; | |
| 92 | when 6 => return C.E6; | |
| 93 | when 7 => return C.E7; | |
| 94 | end case; | |
| 95 | end Get_15; | |
| 96 | ||
| 97 | ------------ | |
| 98 | -- Set_15 -- | |
| 99 | ------------ | |
| 100 | ||
| 101 | procedure Set_15 (Arr : System.Address; N : Natural; E : Bits_15) is | |
| 102 | C : constant Cluster_Ref := To_Ref (Arr + Bits * Ofs (Uns (N) / 8)); | |
| 103 | ||
| 104 | begin | |
| 105 | case N07 (Uns (N) mod 8) is | |
| 106 | when 0 => C.E0 := E; | |
| 107 | when 1 => C.E1 := E; | |
| 108 | when 2 => C.E2 := E; | |
| 109 | when 3 => C.E3 := E; | |
| 110 | when 4 => C.E4 := E; | |
| 111 | when 5 => C.E5 := E; | |
| 112 | when 6 => C.E6 := E; | |
| 113 | when 7 => C.E7 := E; | |
| 114 | end case; | |
| 115 | end Set_15; | |
| 116 | ||
| 117 | end System.Pack_15; |