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115 lines
3.3 KiB
C
115 lines
3.3 KiB
C
/* 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, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* As a special exception, if you link this library with other files,
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some of which are compiled with GCC, to produce an executable,
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this library does not by itself cause the resulting executable
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to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License. */
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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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extern void __cause_ex1 (char *exname, char *file, int lineno);
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/*
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* function __flsetpowerset
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*
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* parameters:
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* ps powerset
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* bitlength length of powerset
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* minval set low bound
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* filename caller's file name
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* lineno caller's line number
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*
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* returns:
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* int largest enumeration value
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* exceptions:
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* "empty" if set is empty
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*
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* abstract:
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* Find last bit set in a powerset and return the corresponding value.
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*
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*/
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long
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__flsetpowerset (ps, bitlength, minval, filename, lineno)
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SET_WORD *ps;
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unsigned long bitlength;
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long minval;
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char *filename;
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int lineno;
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{
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unsigned long bitno;
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if (bitlength <= SET_CHAR_SIZE)
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{
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SET_CHAR cset = *((SET_CHAR *)ps);
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if (cset != 0)
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{
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/* found a bit set .. calculate which */
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for (bitno = SET_CHAR_SIZE; bitno >= 1; bitno--)
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if (GET_BIT_IN_CHAR (cset, bitno - 1))
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break;
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/* return its index */
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return bitno + minval - 1;
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}
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}
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else if (bitlength <= SET_SHORT_SIZE)
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{
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SET_SHORT sset = *((SET_SHORT *)ps);
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if (sset != 0)
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{
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/* found a bit set .. calculate which */
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for (bitno = SET_SHORT_SIZE; bitno >= 1; bitno--)
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if (GET_BIT_IN_SHORT (sset, bitno - 1))
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break;
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/* return its index */
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return bitno + minval - 1;
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}
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}
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else /* set composed of array of one or more WORDs */
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{
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SET_WORD *endp = ps;
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SET_WORD *p = ps + BITS_TO_WORDS(bitlength) - 1;
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unsigned long cnt;
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/* FIXME: bitorder problems? */
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for (cnt = ((bitlength - 1) / SET_WORD_SIZE) * SET_WORD_SIZE;
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p >= endp; p--, cnt -= SET_WORD_SIZE)
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{
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SET_WORD c = *p;
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if (c)
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{
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/* found a bit set .. calculate which */
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for (bitno = SET_WORD_SIZE; bitno >= 1; bitno--)
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if (GET_BIT_IN_WORD (c, bitno - 1))
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break;
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return cnt + bitno + minval - 1;
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}
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}
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}
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/* no bits found - raise exception */
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__cause_ex1 ("empty", filename, lineno);
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}
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