[gcc.git] / libchill / inps.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, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* As a special exception, if you link this library with other files,
   some of which are compiled with GCC, to produce an executable,
   this library does not by itself cause the resulting executable
   to be covered by the GNU General Public License.
   This exception does not however invalidate any other reasons why
   the executable file might be covered by the GNU General Public License.  */

#define __CHILL_LIB__

#include <stdio.h>
#include "powerset.h"

/*
 * function __inpowerset
 *
 * parameters:
 *	bitno		bit number within set
 *	powerset	the powerset
 *	bitlength	length of powerset in bits
 *      minval          number of lowest bit stored
 *
 * returns:
 *	int		1 .. found
 *			0 .. not found
 *
 * exceptions:
 *  rangefail
 *
 * abstract:
 *  checks if a given value is included in a powerset
 *
 */
int
__inpowerset (bitno, powerset, bitlength, minval)
     unsigned long  bitno;
     SET_WORD      *powerset;
     unsigned long  bitlength;
     long           minval;
{
  if (bitno < minval || (bitno - minval) >= bitlength)
    return 0;
    
  bitno -= minval;
  if (bitlength <= SET_CHAR_SIZE)
    return GET_BIT_IN_CHAR (*((SET_CHAR *)powerset), bitno);
  else if (bitlength <= SET_SHORT_SIZE)
    return GET_BIT_IN_SHORT (*((SET_SHORT *)powerset), bitno);
  else
    return GET_BIT_IN_WORD (powerset[bitno / SET_WORD_SIZE],
			    bitno % 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
201853b4 JL	19	the Free Software Foundation, 59 Temple Place - Suite 330,
201853b4 JL	20	Boston, MA 02111-1307, USA. */
b79f73df	21
502b941f JL	22	/* As a special exception, if you link this library with other files,
	23	some of which are compiled with GCC, to produce an executable,
	24	this library does not by itself cause the resulting executable
	25	to be covered by the GNU General Public License.
	26	This exception does not however invalidate any other reasons why
	27	the executable file might be covered by the GNU General Public License. */
	28
b79f73df JL	29	#define __CHILL_LIB__
b79f73df JL	30
b79f73df JL	31	#include <stdio.h>
	32	#include "powerset.h"
	33
	34	/*
	35	* function __inpowerset
	36	*
	37	* parameters:
	38	* bitno bit number within set
	39	* powerset the powerset
	40	* bitlength length of powerset in bits
	41	* minval number of lowest bit stored
	42	*
	43	* returns:
	44	* int 1 .. found
	45	* 0 .. not found
	46	*
	47	* exceptions:
	48	* rangefail
	49	*
	50	* abstract:
	51	* checks if a given value is included in a powerset
	52	*
	53	*/
	54	int
	55	__inpowerset (bitno, powerset, bitlength, minval)
	56	unsigned long bitno;
	57	SET_WORD *powerset;
	58	unsigned long bitlength;
	59	long minval;
	60	{
	61	if (bitno < minval \|\| (bitno - minval) >= bitlength)
	62	return 0;
	63
	64	bitno -= minval;
	65	if (bitlength <= SET_CHAR_SIZE)
	66	return GET_BIT_IN_CHAR (((SET_CHAR )powerset), bitno);
	67	else if (bitlength <= SET_SHORT_SIZE)
	68	return GET_BIT_IN_SHORT (((SET_SHORT )powerset), bitno);
	69	else
	70	return GET_BIT_IN_WORD (powerset[bitno / SET_WORD_SIZE],
	71	bitno % SET_WORD_SIZE);
	72	}