117 lines
3.2 KiB
C
117 lines
3.2 KiB
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"
|
|
|
|
extern void __cause_ex1 (char *exname, char *file, int lineno);
|
|
|
|
/*
|
|
* function __ffsetpowerset
|
|
*
|
|
* parameters:
|
|
* ps powerset
|
|
* bitlength length of powerset
|
|
* minval set low bound
|
|
* filename caller's file name
|
|
* lineno caller's line number
|
|
*
|
|
* returns:
|
|
* int enum value of lowest member of powerset
|
|
*
|
|
* exceptions:
|
|
* "empty" if the set is empty
|
|
*
|
|
* abstract:
|
|
* Find first bit set in a powerset and return the corresponding value.
|
|
*
|
|
*/
|
|
long
|
|
__ffsetpowerset (ps, bitlength, minval, filename, lineno)
|
|
SET_WORD *ps;
|
|
unsigned long bitlength;
|
|
long minval;
|
|
char *filename;
|
|
int lineno;
|
|
{
|
|
unsigned long bitno;
|
|
|
|
if (bitlength <= SET_CHAR_SIZE)
|
|
{
|
|
SET_CHAR cset = *((SET_CHAR *)ps);
|
|
if (cset != 0)
|
|
{
|
|
/* found a bit set .. calculate which */
|
|
for (bitno = 0; bitno < SET_CHAR_SIZE; bitno++)
|
|
if (GET_BIT_IN_CHAR (cset, bitno))
|
|
break;
|
|
/* return its index */
|
|
return bitno + minval;
|
|
}
|
|
}
|
|
else if (bitlength <= SET_SHORT_SIZE)
|
|
{
|
|
SET_SHORT sset = *((SET_SHORT *)ps);
|
|
if (sset != 0)
|
|
{
|
|
/* found a bit set .. calculate which */
|
|
for (bitno = 0; bitno < SET_SHORT_SIZE; bitno++)
|
|
if (GET_BIT_IN_SHORT (sset, bitno))
|
|
break;
|
|
/* return its index */
|
|
return bitno + minval;
|
|
}
|
|
}
|
|
else /* set composed of array of one or more WORDs */
|
|
{
|
|
SET_WORD *p = ps;
|
|
SET_WORD *endp = ps + BITS_TO_WORDS(bitlength);
|
|
unsigned long cnt;
|
|
|
|
/* FIXME: bitorder problems? */
|
|
for (cnt = 0; p < endp; p++, cnt += SET_WORD_SIZE)
|
|
{
|
|
SET_WORD c = *p;
|
|
|
|
if (c)
|
|
{
|
|
/* found a bit set .. calculate which */
|
|
for (bitno = 0; bitno < SET_WORD_SIZE; bitno++)
|
|
if (GET_BIT_IN_WORD (c, bitno))
|
|
break;
|
|
/* return its index */
|
|
return cnt + bitno + minval;
|
|
}
|
|
}
|
|
}
|
|
/* no bits found - raise exception */
|
|
__cause_ex1 ("empty", filename, lineno);
|
|
}
|