mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-17 06:58:58 +08:00
b79f73df6a
* Makefile.in Revamped due to move. Add multilib support.
* configure.in: Similarly. Use autoconf.
* powerset.h: Do not depend on BITS_PER_UNIT.
From-SVN: r22238
100 lines
2.5 KiB
C
100 lines
2.5 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
|
|
#define __CHILL_LIB__
|
|
|
|
#include "config.h"
|
|
#include <stdio.h>
|
|
#include "powerset.h"
|
|
|
|
/*
|
|
* function __flsetclrpowerset
|
|
*
|
|
* parameters:
|
|
* ps powerset
|
|
* bitlength length of powerset
|
|
*
|
|
* returns:
|
|
* int -1 .. nothing found
|
|
* >= 0 .. index of last set bit
|
|
* exceptions:
|
|
* none
|
|
*
|
|
* abstract:
|
|
* Find last bit set in a powerset and return the corresponding value
|
|
* in *out and clear this bit. Return 0 for no more found, else 1.
|
|
*
|
|
*/
|
|
int
|
|
__flsetclrpowerset (ps, bitlength, first_bit)
|
|
SET_WORD *ps;
|
|
unsigned long bitlength;
|
|
int first_bit;
|
|
{
|
|
register int bitno;
|
|
|
|
#ifndef USE_CHARS
|
|
if (bitlength <= SET_CHAR_SIZE)
|
|
{
|
|
for (bitno = bitlength - 1; bitno >= first_bit; bitno--)
|
|
if (GET_BIT_IN_CHAR (*((SET_CHAR *)ps), bitno))
|
|
break;
|
|
return bitno < first_bit ? -1 : bitno;
|
|
}
|
|
else if (bitlength <= SET_SHORT_SIZE)
|
|
{
|
|
for (bitno = bitlength - 1; bitno >= first_bit; bitno--)
|
|
if (GET_BIT_IN_SHORT (*((SET_SHORT *)ps), bitno))
|
|
break;
|
|
return bitno < first_bit ? -1 : bitno;
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
SET_WORD *p, c;
|
|
bitno = bitlength - 1;
|
|
if (bitno < first_bit)
|
|
return -1;
|
|
p = &ps[(unsigned) bitno / SET_WORD_SIZE];
|
|
c = *p;
|
|
if (((unsigned) bitlength % SET_WORD_SIZE) != 0)
|
|
MASK_UNUSED_WORD_BITS(&c, (unsigned) bitlength % SET_WORD_SIZE);
|
|
if (c)
|
|
goto found;
|
|
else
|
|
bitno -= ((unsigned) bitno % SET_WORD_SIZE) + 1;
|
|
while (bitno >= first_bit)
|
|
{
|
|
c = *--p;
|
|
if (c)
|
|
goto found;
|
|
bitno -= SET_WORD_SIZE;
|
|
}
|
|
return -1;
|
|
found:
|
|
for (; bitno >= first_bit; bitno--)
|
|
{
|
|
if (GET_BIT_IN_WORD (c, (unsigned) bitno % SET_WORD_SIZE))
|
|
return bitno;
|
|
}
|
|
return -1;
|
|
}
|
|
}
|