Mercurial > hg > CbC > CbC_gcc
comparison gcc/ada/libgnat/s-veboop.adb @ 111:04ced10e8804
gcc 7
| author | kono |
|---|---|
| date | Fri, 27 Oct 2017 22:46:09 +0900 |
| parents | |
| children | 84e7813d76e9 |
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| 68:561a7518be6b | 111:04ced10e8804 |
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| 1 ------------------------------------------------------------------------------ | |
| 2 -- -- | |
| 3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- | |
| 4 -- -- | |
| 5 -- S Y S T E M . V E C T O R S . B O O L E A N _ O P E R A T I O N S -- | |
| 6 -- -- | |
| 7 -- B o d y -- | |
| 8 -- -- | |
| 9 -- Copyright (C) 2002-2017, Free Software Foundation, Inc. -- | |
| 10 -- -- | |
| 11 -- GNAT is free software; you can redistribute it and/or modify it under -- | |
| 12 -- terms of the GNU General Public License as published by the Free Soft- -- | |
| 13 -- ware Foundation; either version 3, or (at your option) any later ver- -- | |
| 14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- | |
| 15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- | |
| 16 -- or FITNESS FOR A PARTICULAR PURPOSE. -- | |
| 17 -- -- | |
| 18 -- As a special exception under Section 7 of GPL version 3, you are granted -- | |
| 19 -- additional permissions described in the GCC Runtime Library Exception, -- | |
| 20 -- version 3.1, as published by the Free Software Foundation. -- | |
| 21 -- -- | |
| 22 -- You should have received a copy of the GNU General Public License and -- | |
| 23 -- a copy of the GCC Runtime Library Exception along with this program; -- | |
| 24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- | |
| 25 -- <http://www.gnu.org/licenses/>. -- | |
| 26 -- -- | |
| 27 -- GNAT was originally developed by the GNAT team at New York University. -- | |
| 28 -- Extensive contributions were provided by Ada Core Technologies Inc. -- | |
| 29 -- -- | |
| 30 ------------------------------------------------------------------------------ | |
| 31 | |
| 32 package body System.Vectors.Boolean_Operations is | |
| 33 | |
| 34 SU : constant := Storage_Unit; | |
| 35 -- Convenient short hand, used throughout | |
| 36 | |
| 37 -- The coding of this unit depends on the fact that the Component_Size | |
| 38 -- of a normally declared array of Boolean is equal to Storage_Unit. We | |
| 39 -- can't use the Component_Size directly since it is non-static. The | |
| 40 -- following declaration checks that this declaration is correct | |
| 41 | |
| 42 type Boolean_Array is array (Integer range <>) of Boolean; | |
| 43 pragma Compile_Time_Error | |
| 44 (Boolean_Array'Component_Size /= SU, "run time compile failure"); | |
| 45 | |
| 46 -- NOTE: The boolean literals must be qualified here to avoid visibility | |
| 47 -- anomalies when this package is compiled through Rtsfind, in a context | |
| 48 -- that includes a user-defined type derived from boolean. | |
| 49 | |
| 50 True_Val : constant Vector := Standard.True'Enum_Rep | |
| 51 + Standard.True'Enum_Rep * 2**SU | |
| 52 + Standard.True'Enum_Rep * 2**(SU * 2) | |
| 53 + Standard.True'Enum_Rep * 2**(SU * 3) | |
| 54 + Standard.True'Enum_Rep * 2**(SU * 4) | |
| 55 + Standard.True'Enum_Rep * 2**(SU * 5) | |
| 56 + Standard.True'Enum_Rep * 2**(SU * 6) | |
| 57 + Standard.True'Enum_Rep * 2**(SU * 7); | |
| 58 -- This constant represents the bits to be flipped to perform a logical | |
| 59 -- "not" on a vector of booleans, independent of the actual | |
| 60 -- representation of True. | |
| 61 | |
| 62 -- The representations of (False, True) are assumed to be zero/one and | |
| 63 -- the maximum number of unpacked booleans per Vector is assumed to be 8. | |
| 64 | |
| 65 pragma Assert (Standard.False'Enum_Rep = 0); | |
| 66 pragma Assert (Standard.True'Enum_Rep = 1); | |
| 67 pragma Assert (Vector'Size / Storage_Unit <= 8); | |
| 68 | |
| 69 -- The reason we need to do these gymnastics is that no call to | |
| 70 -- Unchecked_Conversion can be made at the library level since this | |
| 71 -- unit is pure. Also a conversion from the array type to the Vector type | |
| 72 -- inside the body of "not" is inefficient because of alignment issues. | |
| 73 | |
| 74 ----------- | |
| 75 -- "not" -- | |
| 76 ----------- | |
| 77 | |
| 78 function "not" (Item : Vectors.Vector) return Vectors.Vector is | |
| 79 begin | |
| 80 return Item xor True_Val; | |
| 81 end "not"; | |
| 82 | |
| 83 ---------- | |
| 84 -- Nand -- | |
| 85 ---------- | |
| 86 | |
| 87 function Nand (Left, Right : Boolean) return Boolean is | |
| 88 begin | |
| 89 return not (Left and Right); | |
| 90 end Nand; | |
| 91 | |
| 92 function Nand (Left, Right : Vectors.Vector) return Vectors.Vector is | |
| 93 begin | |
| 94 return not (Left and Right); | |
| 95 end Nand; | |
| 96 | |
| 97 --------- | |
| 98 -- Nor -- | |
| 99 --------- | |
| 100 | |
| 101 function Nor (Left, Right : Boolean) return Boolean is | |
| 102 begin | |
| 103 return not (Left or Right); | |
| 104 end Nor; | |
| 105 | |
| 106 function Nor (Left, Right : Vectors.Vector) return Vectors.Vector is | |
| 107 begin | |
| 108 return not (Left or Right); | |
| 109 end Nor; | |
| 110 | |
| 111 ---------- | |
| 112 -- Nxor -- | |
| 113 ---------- | |
| 114 | |
| 115 function Nxor (Left, Right : Boolean) return Boolean is | |
| 116 begin | |
| 117 return not (Left xor Right); | |
| 118 end Nxor; | |
| 119 | |
| 120 function Nxor (Left, Right : Vectors.Vector) return Vectors.Vector is | |
| 121 begin | |
| 122 return not (Left xor Right); | |
| 123 end Nxor; | |
| 124 | |
| 125 end System.Vectors.Boolean_Operations; |