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/* 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 __powerset_copy
* This is more general than __psslice, since it
* can be told where in the destination powerset (DOFFSET
* parameter) to start storing the slice.
*
* parameters:
* dps dest powerset
* dbl destination bit length
* doffset offset bit number (zero origin)
* sps sourcepowerset
* sbl source powerset length in bits
* start starting bit number
* end ending bit number
*
* exceptions:
* none
*
* abstract:
* Extract into a powerset a slice of another powerset.
*
*/
void
__pscpy (dps, dbl, doffset, sps, sbl, start, length)
SET_WORD *dps;
unsigned long dbl;
unsigned long doffset;
const SET_WORD*sps;
unsigned long sbl;
unsigned long start;
unsigned long length;
{
unsigned long end = start + length - 1;
unsigned long src, dst;
/* assert end >= start;
assert end - start + 1 <= dbl;
assert "the sets don't overlap in memory" */
/* assert doffset >= 0 and < dbl */
for (src = start, dst = doffset; src <= end; src++, dst++)
{
char tmp;
if (sbl <= SET_CHAR_SIZE) /* fetch a bit */
tmp = GET_BIT_IN_CHAR (*((SET_CHAR *)sps), src);
else if (sbl <= SET_SHORT_SIZE)
tmp = GET_BIT_IN_SHORT (*((SET_SHORT *)sps), src);
else
tmp = GET_BIT_IN_WORD (sps[src / SET_WORD_SIZE], src % SET_WORD_SIZE);
if (tmp & 1)
{
if (dbl <= SET_CHAR_SIZE) /* store a 1-bit */
SET_BIT_IN_CHAR (*((SET_CHAR *)dps), dst);
else if (dbl <= SET_SHORT_SIZE)
SET_BIT_IN_SHORT (*((SET_SHORT *)dps), dst);
else
SET_BIT_IN_WORD (dps[dst / SET_WORD_SIZE], dst % SET_WORD_SIZE);
}
else
{
if (dbl <= SET_CHAR_SIZE) /* store a 0-bit */
CLEAR_BIT_IN_CHAR (*((SET_CHAR *)dps), dst);
else if (dbl <= SET_SHORT_SIZE)
CLEAR_BIT_IN_SHORT (*((SET_SHORT *)dps), dst);
else
CLEAR_BIT_IN_WORD (dps[dst / SET_WORD_SIZE], dst % SET_WORD_SIZE);
}
}
if (dbl <= SET_CHAR_SIZE) /* clear unused bits in output bitstring */
{
MASK_UNUSED_CHAR_BITS ((SET_CHAR *)dps, dbl);
}
else if (dbl <= SET_SHORT_SIZE)
{
MASK_UNUSED_SHORT_BITS ((SET_SHORT *)dps, dbl);
}
else
{
MASK_UNUSED_WORD_BITS ((SET_WORD *)(dps + (dbl/SET_WORD_SIZE)),
dbl % SET_WORD_SIZE);
}
}
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