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