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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
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--                                                                          --
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--    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     --
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--                                                                          --
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--                                 S p e c                                  --
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--                                                                          --
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--          Copyright (C) 2002-2009, Free Software Foundation, Inc.         --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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--  This package contains functions for runtime operations on boolean vectors
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package System.Vectors.Boolean_Operations is
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   pragma Pure;
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   --  Although in general the boolean operations on arrays of booleans are
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   --  identical to operations on arrays of unsigned words of the same size,
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   --  for the "not" operator this is not the case as False is typically
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   --  represented by 0 and true by 1.
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   function "not" (Item : Vectors.Vector) return Vectors.Vector;
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   --  The three boolean operations "nand", "nor" and "nxor" are needed
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   --  for cases where the compiler moves boolean array operations into
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   --  the body of the loop that iterates over the array elements.
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   --  Note the following equivalences:
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   --    (not X) or  (not Y)  =  not (X and Y)  =  Nand (X, Y)
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   --    (not X) and (not Y)  =  not (X or Y)   =  Nor  (X, Y)
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   --    (not X) xor (not Y)  =  X xor Y
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   --    X       xor (not Y)  =  not (X xor Y)  =  Nxor (X, Y)
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   function Nand (Left, Right : Boolean) return Boolean;
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   function Nor  (Left, Right : Boolean) return Boolean;
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   function Nxor (Left, Right : Boolean) return Boolean;
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   function Nand (Left, Right : Vectors.Vector) return Vectors.Vector;
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   function Nor (Left, Right : Vectors.Vector) return Vectors.Vector;
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   function Nxor (Left, Right : Vectors.Vector) return Vectors.Vector;
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   pragma Inline_Always ("not");
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   pragma Inline_Always (Nand);
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   pragma Inline_Always (Nor);
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   pragma Inline_Always (Nxor);
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end System.Vectors.Boolean_Operations;

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