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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 __eqpowerset
*
* parameters:
* left left powerset
* right right powerset
* bitlength length of powerset in bits
*
* returns:
* 1 if powersets are equal, bit for bit
*
* exceptions:
* none
*
* abstract:
* compares two powersets for equality
*
*/
int
__eqpowerset (left, right, bitlength)
SET_WORD *left;
SET_WORD *right;
unsigned long bitlength;
{
#ifndef USE_CHARS
if (bitlength <= SET_CHAR_SIZE)
{
SET_CHAR c = *(SET_CHAR *)left ^ *(SET_CHAR *)right;
MASK_UNUSED_CHAR_BITS (&c, bitlength);
return (c == 0) ? 1 : 0;
}
else if (bitlength <= SET_SHORT_SIZE)
{
SET_SHORT c = *(SET_SHORT *)left ^ *(SET_SHORT *)right;
MASK_UNUSED_SHORT_BITS (&c, bitlength);
return (c == 0) ? 1 : 0;
}
else if (bitlength <= SET_WORD_SIZE)
{
SET_WORD c = *(SET_WORD *)left ^ *(SET_WORD *)right;
MASK_UNUSED_WORD_BITS (&c, bitlength % SET_WORD_SIZE);
return (c == 0) ? 1 : 0;
}
else
#endif
{
SET_WORD c;
register unsigned long i;
unsigned long len = bitlength / SET_WORD_SIZE;
for (i = 0; i < len; i++) /* a word-oriented memcmp */
if (left[i] != right[i])
return 0;
/* do the last (possibly partial) word */
bitlength %= SET_WORD_SIZE;
if (bitlength == 0)
return 1;
c = left[i] ^ right[i];
MASK_UNUSED_WORD_BITS (&c, bitlength);
return (c == 0) ? 1 : 0;
}
}
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