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/* Implement 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
#define __CHILL_LIB__
#include "config.h"
#include <stdio.h>
#include "powerset.h"
/*
* function __ltpowerset
*
* parameters:
* left powerset
* right powerset
* bitlength length of powerset
*
* returns:
* int 1 .. left is proper subset of right
* (excludes case where left == right)
* 0 .. not
*
* abstract:
* check if one powerset is included in another
*
*/
int
__ltpowerset (left, right, bitlength)
SET_WORD *left;
SET_WORD *right;
unsigned long bitlength;
{
if (bitlength <= SET_CHAR_SIZE)
{
if ((*((SET_CHAR *)left) & *((SET_CHAR *)right))
!= *((SET_CHAR *)left))
return 0;
if (*((SET_CHAR *)left) != *((SET_CHAR *)right))
return 1;
return 0;
}
else if (bitlength <= SET_SHORT_SIZE)
{
if ((*((SET_SHORT *)left) & *((SET_SHORT *)right))
!= *((SET_SHORT *)left))
return 0;
if (*((SET_SHORT *)left) != *((SET_SHORT *)right))
return 1;
return 0;
}
else
{
SET_WORD *endp = left + BITS_TO_WORDS(bitlength);
int all_equal = 1; /* assume all bits are equal */
while (left < endp)
{
if ((*right & *left) != *left)
return 0;
if (*left != *right)
all_equal = 0;
left++;
right++;
}
if (left == endp && all_equal) /* exclude TRUE return for == case */
return 0;
return 1;
}
}
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