(*
 * Bit.m
 * 
 * This file is part of the Oxford Oberon-2 compiler
 * Copyright (c) 2006 J. M. Spivey
 * All rights reserved
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *)

(** Bitwise operations on integers *)
MODULE Bit;

IMPORT SYSTEM;

(** And -- bitwise and *)
PROCEDURE And*(x, y: INTEGER): INTEGER;
BEGIN
  RETURN SYSTEM.VAL(INTEGER, SYSTEM.VAL(SET, x) * SYSTEM.VAL(SET, y))
END And;

(** Or -- bitwise or *)
PROCEDURE Or*(x, y: INTEGER): INTEGER;
BEGIN
  RETURN SYSTEM.VAL(INTEGER, SYSTEM.VAL(SET, x) + SYSTEM.VAL(SET, y))
END Or;

(** Xor -- bitwise xor *)
PROCEDURE Xor*(x, y: INTEGER): INTEGER;
BEGIN
  RETURN SYSTEM.VAL(INTEGER, SYSTEM.VAL(SET, x) / SYSTEM.VAL(SET, y))
END Xor;

(** Not -- bitwise not *)
PROCEDURE Not*(x: INTEGER): INTEGER;
BEGIN
  RETURN SYSTEM.VAL(INTEGER, - SYSTEM.VAL(SET, x))
END Not;

END Bit.
