git.distorted.org.uk Git - u/mdw/catacomb/blob - math/bitops.h

   1 /* -*-c-*-
   2  *
   3  * Bit operations by truth table
   4  *
   5  * (c) 2002 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of Catacomb.
  11  *
  12  * Catacomb is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU Library General Public License as
  14  * published by the Free Software Foundation; either version 2 of the
  15  * License, or (at your option) any later version.
  16  *
  17  * Catacomb is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU Library General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU Library General Public
  23  * License along with Catacomb; if not, write to the Free
  24  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  25  * MA 02111-1307, USA.
  26  */
  27
  28 #ifndef CATACOMB_BITOPS_H
  29 #define CATACOMB_BITOPS_H
  30
  31 #ifdef __cplusplus
  32   extern "C" {
  33 #endif
  34
  35 /*----- Macros ------------------------------------------------------------*/
  36
  37 #define B0000(x, y) (0u)
  38 #define B0001(x, y) ((x) & (y))
  39 #define B0010(x, y) ((x) & ~(y))
  40 #define B0011(x, y) (x)
  41 #define B0100(x, y) (~(x) & (y))
  42 #define B0101(x, y) (y)
  43 #define B0110(x, y) ((x) ^ (y))
  44 #define B0111(x, y) ((x) | (y))
  45 #define B1000(x, y) (~((x) | (y)))
  46 #define B1001(x, y) (~((x) ^ (y)))
  47 #define B1010(x, y) (~(y))
  48 #define B1011(x, y) ((x) | ~(y))
  49 #define B1100(x, y) (~(x))
  50 #define B1101(x, y) (~(x) | (y))
  51 #define B1110(x, y) (~((x) & (y)))
  52 #define B1111(x, y) (~0u)
  53
  54 /*----- That's all, folks -------------------------------------------------*/
  55
  56 #ifdef __cplusplus
  57   }
  58 #endif
  59
  60 #endif