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86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
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/* Implement 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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#define __CHILL_LIB__
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#include <stdio.h>
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#include "powerset.h"
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/*
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* function __ltpowerset
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*
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* parameters:
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* left powerset
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* right powerset
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* bitlength length of powerset
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*
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* returns:
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* int 1 .. left is proper subset of right
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* (excludes case where left == right)
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* 0 .. not
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*
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* abstract:
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* check if one powerset is included in another
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*
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*/
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int
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__ltpowerset (left, right, bitlength)
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SET_WORD *left;
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SET_WORD *right;
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unsigned long bitlength;
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{
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if (bitlength <= SET_CHAR_SIZE)
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{
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if ((*((SET_CHAR *)left) & *((SET_CHAR *)right))
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!= *((SET_CHAR *)left))
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return 0;
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if (*((SET_CHAR *)left) != *((SET_CHAR *)right))
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return 1;
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return 0;
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}
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else if (bitlength <= SET_SHORT_SIZE)
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{
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if ((*((SET_SHORT *)left) & *((SET_SHORT *)right))
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!= *((SET_SHORT *)left))
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return 0;
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if (*((SET_SHORT *)left) != *((SET_SHORT *)right))
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return 1;
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return 0;
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}
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else
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{
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SET_WORD *endp = left + BITS_TO_WORDS(bitlength);
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int all_equal = 1; /* assume all bits are equal */
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while (left < endp)
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{
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if ((*right & *left) != *left)
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return 0;
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if (*left != *right)
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all_equal = 0;
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left++;
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right++;
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}
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if (left == endp && all_equal) /* exclude TRUE return for == case */
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return 0;
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return 1;
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}
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}
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