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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 <stdio.h>
#include "powerset.h"
/*
* function __diffpowerset
*
* parameters:
* out result of __diffpowerset
* left powerset
* right powerset
* bitlength length of powerset
*
* returns:
* void
*
* exceptions:
* none
*
* abstract:
* makes a difference of 2 powersets (out = left - right)
*
*/
void
__diffpowerset (out, left, right, bitlength)
SET_WORD *out;
SET_WORD *left;
SET_WORD *right;
unsigned long bitlength;
{
if (bitlength <= SET_CHAR_SIZE)
{
*((SET_CHAR *)out) = *((SET_CHAR *)left) & ~
*((SET_CHAR *)right);
MASK_UNUSED_CHAR_BITS ((SET_CHAR *)out, bitlength);
}
else if (bitlength <= SET_SHORT_SIZE)
{
*((SET_SHORT *)out) = *((SET_SHORT *)left) & ~
*((SET_SHORT *)right);
MASK_UNUSED_SHORT_BITS ((SET_SHORT *)out, bitlength);
}
else
{
unsigned long len = BITS_TO_WORDS(bitlength);
register unsigned long i;
for (i = 0; i < len; i++)
out[i] = left[i] & ~right[i];
MASK_UNUSED_WORD_BITS ((out + len - 1), bitlength % SET_WORD_SIZE);
}
}
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