diff options
Diffstat (limited to 'gcc/ada/s-veboop.ads')
| -rw-r--r-- | gcc/ada/s-veboop.ads | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/gcc/ada/s-veboop.ads b/gcc/ada/s-veboop.ads new file mode 100644 index 00000000000..2c86527977e --- /dev/null +++ b/gcc/ada/s-veboop.ads @@ -0,0 +1,68 @@ +------------------------------------------------------------------------------ +-- -- +-- GNU ADA RUNTIME 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 -- +-- -- +-- S p e c -- +-- -- +-- Copyright (C) 2002 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 2, 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. See the GNU General Public License -- +-- for more details. You should have received a copy of the GNU General -- +-- Public License distributed with GNAT; see file COPYING. If not, write -- +-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- +-- MA 02111-1307, USA. -- +-- -- +-- As a special exception, if other files instantiate generics from this -- +-- unit, or you link this unit with other files to produce an executable, -- +-- this unit does not by itself cause the resulting executable to be -- +-- covered by the GNU General Public License. This exception does not -- +-- however invalidate any other reasons why the executable file might be -- +-- covered by the GNU Public License. -- +-- -- +-- GNAT was originally developed by the GNAT team at New York University. -- +-- Extensive contributions were provided by Ada Core Technologies Inc. -- +-- -- +------------------------------------------------------------------------------ + +-- This package contains functions for runtime operations on boolean vectors + +package System.Vectors.Boolean_Operations is +pragma Pure (Boolean_Operations); + + -- Although in general the boolean operations on arrays of booleans are + -- identical to operations on arrays of unsigned words of the same size, + -- for the "not" operator this is not the case as False is typically + -- represented by 0 and true by 1. + + function "not" (Item : Vectors.Vector) return Vectors.Vector; + + -- The three boolean operations "nand", "nor" and "nxor" are needed + -- for cases where the compiler moves boolean array operations into + -- the body of the loop that iterates over the array elements. + + -- Note the following equivalences: + -- (not X) or (not Y) = not (X and Y) = Nand (X, Y) + -- (not X) and (not Y) = not (X or Y) = Nor (X, Y) + -- (not X) xor (not Y) = X xor Y + -- X xor (not Y) = not (X xor Y) = Nxor (X, Y) + + function Nand (Left, Right : Boolean) return Boolean; + function Nor (Left, Right : Boolean) return Boolean; + function Nxor (Left, Right : Boolean) return Boolean; + + function Nand (Left, Right : Vectors.Vector) return Vectors.Vector; + function Nor (Left, Right : Vectors.Vector) return Vectors.Vector; + function Nxor (Left, Right : Vectors.Vector) return Vectors.Vector; + + pragma Inline_Always ("not"); + pragma Inline_Always (Nand); + pragma Inline_Always (Nor); + pragma Inline_Always (Nxor); +end System.Vectors.Boolean_Operations; |