114 lines
4.1 KiB
C
114 lines
4.1 KiB
C
/* Common macros for POWERSET runtime actions for CHILL.
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Copyright (C) 1992,1993 Free Software Foundation, Inc.
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Author: Wilfried Moser, et al
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* As a special exception, if you link this library with other files,
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some of which are compiled with GCC, to produce an executable,
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this library does not by itself cause the resulting executable
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to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License. */
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#ifndef _POWERSET_H
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#define _POWERSET_H
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#define USE_CHARS
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#ifdef USE_CHARS
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#define SET_WORD unsigned char
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#define SET_CHAR unsigned char
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#define SET_SHORT unsigned char
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#else
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#ifndef SET_WORD
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#define SET_WORD unsigned int
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#endif
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#define SET_CHAR unsigned char
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#define SET_SHORT unsigned short
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#endif
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#define SET_WORD_SIZE (sizeof (char) * sizeof (SET_WORD))
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#define SET_SHORT_SIZE (sizeof (char) * sizeof (SET_SHORT))
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#define SET_CHAR_SIZE sizeof (char)
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/* Powersets and bit strings are stored as arrays of SET_WORD.
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if they are a word or longer. Powersets and bit strings whic
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fit in a byte or short are stored that way by the compiler.
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The order of the bits follows native bit order:
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If BITS_BIG_ENDIAN, bit 0 is the most significant bit (i.e. 0x80..00);
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otherwise, bit 0 is the least significant bit (i.e. 0x1).
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MASK_UNUSED_BITS masks out unused bits in powersets and bitstrings.
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GET_BIT_IN_WORD(W,B) yields 1 (or 0) if the B'th bit if W is set (cleared).
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*/
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#if BITS_BIG_ENDIAN
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#define GET_BIT_IN_WORD(w,b) (((w) >> (SET_WORD_SIZE - 1 - (b))) & 1)
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#define GET_BIT_IN_SHORT(w,b) (((w) >> (SET_SHORT_SIZE - 1 - (b))) & 1)
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#define GET_BIT_IN_CHAR(w,b) (((w) >> (SET_CHAR_SIZE - 1 - (b))) & 1)
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#define SET_BIT_IN_WORD(w,b) ((w) |= 1 << ((SET_WORD_SIZE) - 1 - (b)))
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#define SET_BIT_IN_SHORT(w,b) ((w) |= 1 << ((SET_SHORT_SIZE) - 1 - (b)))
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#define SET_BIT_IN_CHAR(w,b) ((w) |= 1 << ((SET_CHAR_SIZE) - 1 - (b)))
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#define CLEAR_BIT_IN_WORD(w,b) ((w) &= ~(1 << ((SET_WORD_SIZE) - 1 - (b))))
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#define CLEAR_BIT_IN_SHORT(w,b) ((w) &= ~(1 << ((SET_SHORT_SIZE) - 1 - (b))))
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#define CLEAR_BIT_IN_CHAR(w,b) ((w) &= ~(1 << ((SET_CHAR_SIZE) - 1 - (b))))
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#define MASK_UNUSED_WORD_BITS(p,b) \
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{ if (b) *(p) &= (~0) << (SET_WORD_SIZE - (b)); }
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#define MASK_UNUSED_SHORT_BITS(p,b) \
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{ if (b) *(p) &= (~0) << (SET_SHORT_SIZE - (b)); }
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#define MASK_UNUSED_CHAR_BITS(p,b) \
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{ if (b) *(p) &= (~0) << (SET_CHAR_SIZE - (b)); }
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#else /* !BITS_BIG_ENDIAN */
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#define GET_BIT_IN_WORD(w,b) (((w) >> (b)) & 1)
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#define GET_BIT_IN_SHORT(w,b) GET_BIT_IN_WORD(w,b)
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#define GET_BIT_IN_CHAR(w,b) GET_BIT_IN_WORD(w,b)
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#define SET_BIT_IN_WORD(w,b) ((w) |= 1 << (b))
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#define SET_BIT_IN_SHORT(w,b) SET_BIT_IN_WORD(w,b)
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#define SET_BIT_IN_CHAR(w,b) SET_BIT_IN_WORD(w,b)
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#define CLEAR_BIT_IN_WORD(w,b) ((w) &= ~(1 << (b)))
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#define CLEAR_BIT_IN_SHORT(w,b) CLEAR_BIT_IN_WORD(w,b)
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#define CLEAR_BIT_IN_CHAR(w,b) CLEAR_BIT_IN_WORD(w,b)
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#define MASK_UNUSED_WORD_BITS(p,b) \
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{ if (b) *(p) &= ~((~0) << (b)); }
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#define MASK_UNUSED_SHORT_BITS(p,b) MASK_UNUSED_WORD_BITS(p,b)
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#define MASK_UNUSED_CHAR_BITS(p,b) MASK_UNUSED_WORD_BITS(p,b)
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#endif
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/* Number of words needed for a bitstring/powerset of size BITLENGTH.
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This definition handles the (BITLENGTH==0) by yielding 0. */
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#define BITS_TO_WORDS(BITLENGTH) \
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(((BITLENGTH) + (SET_WORD_SIZE-1)) / SET_WORD_SIZE)
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#define BITS_TO_CHARS(BITLENGTH) \
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(((BITLENGTH) + (SET_CHAR_SIZE-1)) / SET_CHAR_SIZE)
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#endif
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