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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
+-- --
+-- 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 --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 2002-2009, 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. --
+-- --
+------------------------------------------------------------------------------
+
+package body System.Vectors.Boolean_Operations is
+
+ SU : constant := Storage_Unit;
+ -- Convenient short hand, used throughout
+
+ -- The coding of this unit depends on the fact that the Component_Size
+ -- of a normally declared array of Boolean is equal to Storage_Unit. We
+ -- can't use the Component_Size directly since it is non-static. The
+ -- following declaration checks that this declaration is correct
+
+ type Boolean_Array is array (Integer range <>) of Boolean;
+ pragma Compile_Time_Error
+ (Boolean_Array'Component_Size /= SU, "run time compile failure");
+
+ -- NOTE: The boolean literals must be qualified here to avoid visibility
+ -- anomalies when this package is compiled through Rtsfind, in a context
+ -- that includes a user-defined type derived from boolean.
+
+ True_Val : constant Vector := Standard.True'Enum_Rep
+ + Standard.True'Enum_Rep * 2**SU
+ + Standard.True'Enum_Rep * 2**(SU * 2)
+ + Standard.True'Enum_Rep * 2**(SU * 3)
+ + Standard.True'Enum_Rep * 2**(SU * 4)
+ + Standard.True'Enum_Rep * 2**(SU * 5)
+ + Standard.True'Enum_Rep * 2**(SU * 6)
+ + Standard.True'Enum_Rep * 2**(SU * 7);
+ -- This constant represents the bits to be flipped to perform a logical
+ -- "not" on a vector of booleans, independent of the actual
+ -- representation of True.
+
+ -- The representations of (False, True) are assumed to be zero/one and
+ -- the maximum number of unpacked booleans per Vector is assumed to be 8.
+
+ pragma Assert (Standard.False'Enum_Rep = 0);
+ pragma Assert (Standard.True'Enum_Rep = 1);
+ pragma Assert (Vector'Size / Storage_Unit <= 8);
+
+ -- The reason we need to do these gymnastics is that no call to
+ -- Unchecked_Conversion can be made at the library level since this
+ -- unit is pure. Also a conversion from the array type to the Vector type
+ -- inside the body of "not" is inefficient because of alignment issues.
+
+ -----------
+ -- "not" --
+ -----------
+
+ function "not" (Item : Vectors.Vector) return Vectors.Vector is
+ begin
+ return Item xor True_Val;
+ end "not";
+
+ ----------
+ -- Nand --
+ ----------
+
+ function Nand (Left, Right : Boolean) return Boolean is
+ begin
+ return not (Left and Right);
+ end Nand;
+
+ function Nand (Left, Right : Vectors.Vector) return Vectors.Vector is
+ begin
+ return not (Left and Right);
+ end Nand;
+
+ ---------
+ -- Nor --
+ ---------
+
+ function Nor (Left, Right : Boolean) return Boolean is
+ begin
+ return not (Left or Right);
+ end Nor;
+
+ function Nor (Left, Right : Vectors.Vector) return Vectors.Vector is
+ begin
+ return not (Left or Right);
+ end Nor;
+
+ ----------
+ -- Nxor --
+ ----------
+
+ function Nxor (Left, Right : Boolean) return Boolean is
+ begin
+ return not (Left xor Right);
+ end Nxor;
+
+ function Nxor (Left, Right : Vectors.Vector) return Vectors.Vector is
+ begin
+ return not (Left xor Right);
+ end Nxor;
+
+end System.Vectors.Boolean_Operations;