1/* Common macros for POWERSET runtime actions for CHILL. 2 Copyright (C) 1992,1993 Free Software Foundation, Inc. 3 Author: Wilfried Moser, et al 4 5This file is part of GNU CC. 6 7GNU CC is free software; you can redistribute it and/or modify 8it under the terms of the GNU General Public License as published by 9the Free Software Foundation; either version 2, or (at your option) 10any later version. 11 12GNU CC is distributed in the hope that it will be useful, 13but WITHOUT ANY WARRANTY; without even the implied warranty of 14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15GNU General Public License for more details. 16 17You should have received a copy of the GNU General Public License 18along with GNU CC; see the file COPYING. If not, write to 19the Free Software Foundation, 59 Temple Place - Suite 330, 20Boston, MA 02111-1307, USA. */ 21 22/* As a special exception, if you link this library with other files, 23 some of which are compiled with GCC, to produce an executable, 24 this library does not by itself cause the resulting executable 25 to be covered by the GNU General Public License. 26 This exception does not however invalidate any other reasons why 27 the executable file might be covered by the GNU General Public License. */ 28 29#ifndef _POWERSET_H 30#define _POWERSET_H 31 32#define USE_CHARS 33 34#ifdef USE_CHARS 35 36#define SET_WORD unsigned char 37#define SET_CHAR unsigned char 38#define SET_SHORT unsigned char 39 40#else 41 42#ifndef SET_WORD 43#define SET_WORD unsigned int 44#endif 45#define SET_CHAR unsigned char 46#define SET_SHORT unsigned short 47#endif 48 49#define SET_WORD_SIZE (sizeof (char) * sizeof (SET_WORD)) 50#define SET_SHORT_SIZE (sizeof (char) * sizeof (SET_SHORT)) 51#define SET_CHAR_SIZE sizeof (char) 52 53/* Powersets and bit strings are stored as arrays of SET_WORD. 54 if they are a word or longer. Powersets and bit strings whic 55 fit in a byte or short are stored that way by the compiler. 56 57 The order of the bits follows native bit order: 58 If BITS_BIG_ENDIAN, bit 0 is the most significant bit (i.e. 0x80..00); 59 otherwise, bit 0 is the least significant bit (i.e. 0x1). 60 61 MASK_UNUSED_BITS masks out unused bits in powersets and bitstrings. 62 GET_BIT_IN_WORD(W,B) yields 1 (or 0) if the B'th bit if W is set (cleared). 63*/ 64 65#if BITS_BIG_ENDIAN 66#define GET_BIT_IN_WORD(w,b) (((w) >> (SET_WORD_SIZE - 1 - (b))) & 1) 67#define GET_BIT_IN_SHORT(w,b) (((w) >> (SET_SHORT_SIZE - 1 - (b))) & 1) 68#define GET_BIT_IN_CHAR(w,b) (((w) >> (SET_CHAR_SIZE - 1 - (b))) & 1) 69 70#define SET_BIT_IN_WORD(w,b) ((w) |= 1 << ((SET_WORD_SIZE) - 1 - (b))) 71#define SET_BIT_IN_SHORT(w,b) ((w) |= 1 << ((SET_SHORT_SIZE) - 1 - (b))) 72#define SET_BIT_IN_CHAR(w,b) ((w) |= 1 << ((SET_CHAR_SIZE) - 1 - (b))) 73 74#define CLEAR_BIT_IN_WORD(w,b) ((w) &= ~(1 << ((SET_WORD_SIZE) - 1 - (b)))) 75#define CLEAR_BIT_IN_SHORT(w,b) ((w) &= ~(1 << ((SET_SHORT_SIZE) - 1 - (b)))) 76#define CLEAR_BIT_IN_CHAR(w,b) ((w) &= ~(1 << ((SET_CHAR_SIZE) - 1 - (b)))) 77#define MASK_UNUSED_WORD_BITS(p,b) \ 78{ if (b) *(p) &= (~0) << (SET_WORD_SIZE - (b)); } 79#define MASK_UNUSED_SHORT_BITS(p,b) \ 80{ if (b) *(p) &= (~0) << (SET_SHORT_SIZE - (b)); } 81#define MASK_UNUSED_CHAR_BITS(p,b) \ 82{ if (b) *(p) &= (~0) << (SET_CHAR_SIZE - (b)); } 83 84#else /* !BITS_BIG_ENDIAN */ 85 86#define GET_BIT_IN_WORD(w,b) (((w) >> (b)) & 1) 87#define GET_BIT_IN_SHORT(w,b) GET_BIT_IN_WORD(w,b) 88#define GET_BIT_IN_CHAR(w,b) GET_BIT_IN_WORD(w,b) 89 90#define SET_BIT_IN_WORD(w,b) ((w) |= 1 << (b)) 91#define SET_BIT_IN_SHORT(w,b) SET_BIT_IN_WORD(w,b) 92#define SET_BIT_IN_CHAR(w,b) SET_BIT_IN_WORD(w,b) 93 94#define CLEAR_BIT_IN_WORD(w,b) ((w) &= ~(1 << (b))) 95#define CLEAR_BIT_IN_SHORT(w,b) CLEAR_BIT_IN_WORD(w,b) 96#define CLEAR_BIT_IN_CHAR(w,b) CLEAR_BIT_IN_WORD(w,b) 97 98#define MASK_UNUSED_WORD_BITS(p,b) \ 99{ if (b) *(p) &= ~((~0) << (b)); } 100#define MASK_UNUSED_SHORT_BITS(p,b) MASK_UNUSED_WORD_BITS(p,b) 101#define MASK_UNUSED_CHAR_BITS(p,b) MASK_UNUSED_WORD_BITS(p,b) 102 103#endif 104 105 106/* Number of words needed for a bitstring/powerset of size BITLENGTH. 107 This definition handles the (BITLENGTH==0) by yielding 0. */ 108 109#define BITS_TO_WORDS(BITLENGTH) \ 110 (((BITLENGTH) + (SET_WORD_SIZE-1)) / SET_WORD_SIZE) 111#define BITS_TO_CHARS(BITLENGTH) \ 112 (((BITLENGTH) + (SET_CHAR_SIZE-1)) / SET_CHAR_SIZE) 113 114#endif 115