| /* Common macros for POWERSET runtime actions for CHILL. |
| Copyright (C) 1992,1993 Free Software Foundation, Inc. |
| Author: Wilfried Moser, et al |
| |
| This file is part of GNU CC. |
| |
| GNU CC is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU CC is distributed in the hope that it will be useful, |
| but WITHOUT 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 |
| along with GNU CC; see the 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 you link this library with other files, |
| some of which are compiled with GCC, to produce an executable, |
| this library 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 General Public License. */ |
| |
| #ifndef _POWERSET_H |
| #define _POWERSET_H |
| |
| /* Do not set these to anything other than character types without fixing |
| their uses in andps.c and other files which implement bit sets operations. |
| |
| The uses in those files will violate ANSI/ISO C aliasing rules as they |
| are currently written. */ |
| #define SET_WORD unsigned char |
| #define SET_CHAR unsigned char |
| #define SET_SHORT unsigned char |
| |
| #define SET_WORD_SIZE (sizeof (char) * sizeof (SET_WORD)) |
| #define SET_SHORT_SIZE (sizeof (char) * sizeof (SET_SHORT)) |
| #define SET_CHAR_SIZE sizeof (char) |
| |
| /* Powersets and bit strings are stored as arrays of SET_WORD. |
| if they are a word or longer. Powersets and bit strings whic |
| fit in a byte or short are stored that way by the compiler. |
| |
| The order of the bits follows native bit order: |
| If BITS_BIG_ENDIAN, bit 0 is the most significant bit (i.e. 0x80..00); |
| otherwise, bit 0 is the least significant bit (i.e. 0x1). |
| |
| MASK_UNUSED_BITS masks out unused bits in powersets and bitstrings. |
| GET_BIT_IN_WORD(W,B) yields 1 (or 0) if the B'th bit if W is set (cleared). |
| */ |
| |
| #if BITS_BIG_ENDIAN |
| #define GET_BIT_IN_WORD(w,b) (((w) >> (SET_WORD_SIZE - 1 - (b))) & 1) |
| #define GET_BIT_IN_SHORT(w,b) (((w) >> (SET_SHORT_SIZE - 1 - (b))) & 1) |
| #define GET_BIT_IN_CHAR(w,b) (((w) >> (SET_CHAR_SIZE - 1 - (b))) & 1) |
| |
| #define SET_BIT_IN_WORD(w,b) ((w) |= 1 << ((SET_WORD_SIZE) - 1 - (b))) |
| #define SET_BIT_IN_SHORT(w,b) ((w) |= 1 << ((SET_SHORT_SIZE) - 1 - (b))) |
| #define SET_BIT_IN_CHAR(w,b) ((w) |= 1 << ((SET_CHAR_SIZE) - 1 - (b))) |
| |
| #define CLEAR_BIT_IN_WORD(w,b) ((w) &= ~(1 << ((SET_WORD_SIZE) - 1 - (b)))) |
| #define CLEAR_BIT_IN_SHORT(w,b) ((w) &= ~(1 << ((SET_SHORT_SIZE) - 1 - (b)))) |
| #define CLEAR_BIT_IN_CHAR(w,b) ((w) &= ~(1 << ((SET_CHAR_SIZE) - 1 - (b)))) |
| #define MASK_UNUSED_WORD_BITS(p,b) \ |
| { if (b) *(p) &= (~0) << (SET_WORD_SIZE - (b)); } |
| #define MASK_UNUSED_SHORT_BITS(p,b) \ |
| { if (b) *(p) &= (~0) << (SET_SHORT_SIZE - (b)); } |
| #define MASK_UNUSED_CHAR_BITS(p,b) \ |
| { if (b) *(p) &= (~0) << (SET_CHAR_SIZE - (b)); } |
| |
| #else /* !BITS_BIG_ENDIAN */ |
| |
| #define GET_BIT_IN_WORD(w,b) (((w) >> (b)) & 1) |
| #define GET_BIT_IN_SHORT(w,b) GET_BIT_IN_WORD(w,b) |
| #define GET_BIT_IN_CHAR(w,b) GET_BIT_IN_WORD(w,b) |
| |
| #define SET_BIT_IN_WORD(w,b) ((w) |= 1 << (b)) |
| #define SET_BIT_IN_SHORT(w,b) SET_BIT_IN_WORD(w,b) |
| #define SET_BIT_IN_CHAR(w,b) SET_BIT_IN_WORD(w,b) |
| |
| #define CLEAR_BIT_IN_WORD(w,b) ((w) &= ~(1 << (b))) |
| #define CLEAR_BIT_IN_SHORT(w,b) CLEAR_BIT_IN_WORD(w,b) |
| #define CLEAR_BIT_IN_CHAR(w,b) CLEAR_BIT_IN_WORD(w,b) |
| |
| #define MASK_UNUSED_WORD_BITS(p,b) \ |
| { if (b) *(p) &= ~((~0) << (b)); } |
| #define MASK_UNUSED_SHORT_BITS(p,b) MASK_UNUSED_WORD_BITS(p,b) |
| #define MASK_UNUSED_CHAR_BITS(p,b) MASK_UNUSED_WORD_BITS(p,b) |
| |
| #endif |
| |
| |
| /* Number of words needed for a bitstring/powerset of size BITLENGTH. |
| This definition handles the (BITLENGTH==0) by yielding 0. */ |
| |
| #define BITS_TO_WORDS(BITLENGTH) \ |
| (((BITLENGTH) + (SET_WORD_SIZE-1)) / SET_WORD_SIZE) |
| #define BITS_TO_CHARS(BITLENGTH) \ |
| (((BITLENGTH) + (SET_CHAR_SIZE-1)) / SET_CHAR_SIZE) |
| |
| #endif |