[gcc.git] / libchill / diffps.c

/* 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);
    }
}
Commit	Line	Data
b79f73df JL	1	/* Implement POWERSET runtime actions for CHILL.
	2	Copyright (C) 1992,1993 Free Software Foundation, Inc.
	3	Author: Wilfried Moser, et al
	4
	5	This file is part of GNU CC.
	6
	7	GNU CC is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 2, or (at your option)
	10	any later version.
	11
	12	GNU CC is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with GNU CC; see the file COPYING. If not, write to
	19	the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
	20
	21	#define __CHILL_LIB__
	22
b79f73df JL	23	#include <stdio.h>
	24	#include "powerset.h"
	25
	26	/*
	27	* function __diffpowerset
	28	*
	29	* parameters:
	30	* out result of __diffpowerset
	31	* left powerset
	32	* right powerset
	33	* bitlength length of powerset
	34	*
	35	* returns:
	36	* void
	37	*
	38	* exceptions:
	39	* none
	40	*
	41	* abstract:
	42	* makes a difference of 2 powersets (out = left - right)
	43	*
	44	*/
	45	void
	46	__diffpowerset (out, left, right, bitlength)
	47	SET_WORD *out;
	48	SET_WORD *left;
	49	SET_WORD *right;
	50	unsigned long bitlength;
	51	{
	52	if (bitlength <= SET_CHAR_SIZE)
	53	{
	54	((SET_CHAR )out) = ((SET_CHAR )left) & ~
	55	((SET_CHAR )right);
	56	MASK_UNUSED_CHAR_BITS ((SET_CHAR *)out, bitlength);
	57	}
	58	else if (bitlength <= SET_SHORT_SIZE)
	59	{
	60	((SET_SHORT )out) = ((SET_SHORT )left) & ~
	61	((SET_SHORT )right);
	62	MASK_UNUSED_SHORT_BITS ((SET_SHORT *)out, bitlength);
	63	}
	64	else
	65	{
	66	unsigned long len = BITS_TO_WORDS(bitlength);
	67	register unsigned long i;
	68
	69	for (i = 0; i < len; i++)
	70	out[i] = left[i] & ~right[i];
	71	MASK_UNUSED_WORD_BITS ((out + len - 1), bitlength % SET_WORD_SIZE);
	72	}
	73	}