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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, 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 __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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