118 lines
3.6 KiB
C
118 lines
3.6 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, 675 Mass Ave, Cambridge, MA 02139, 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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/*
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* function __powerset_copy
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* This is more general than __psslice, since it
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* can be told where in the destination powerset (DOFFSET
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* parameter) to start storing the slice.
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*
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* parameters:
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* dps dest powerset
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* dbl destination bit length
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* doffset offset bit number (zero origin)
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* sps sourcepowerset
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* sbl source powerset length in bits
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* start starting bit number
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* end ending bit number
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*
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* exceptions:
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* none
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*
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* abstract:
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* Extract into a powerset a slice of another powerset.
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*
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*/
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void
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__pscpy (dps, dbl, doffset, sps, sbl, start, length)
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SET_WORD *dps;
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unsigned long dbl;
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unsigned long doffset;
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const SET_WORD*sps;
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unsigned long sbl;
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unsigned long start;
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unsigned long length;
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{
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unsigned long end = start + length - 1;
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unsigned long src, dst;
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/* assert end >= start;
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assert end - start + 1 <= dbl;
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assert "the sets don't overlap in memory" */
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/* assert doffset >= 0 and < dbl */
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for (src = start, dst = doffset; src <= end; src++, dst++)
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{
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char tmp;
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if (sbl <= SET_CHAR_SIZE) /* fetch a bit */
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tmp = GET_BIT_IN_CHAR (*((SET_CHAR *)sps), src);
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else if (sbl <= SET_SHORT_SIZE)
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tmp = GET_BIT_IN_SHORT (*((SET_SHORT *)sps), src);
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else
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tmp = GET_BIT_IN_WORD (sps[src / SET_WORD_SIZE], src % SET_WORD_SIZE);
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if (tmp & 1)
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{
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if (dbl <= SET_CHAR_SIZE) /* store a 1-bit */
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SET_BIT_IN_CHAR (*((SET_CHAR *)dps), dst);
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else if (dbl <= SET_SHORT_SIZE)
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SET_BIT_IN_SHORT (*((SET_SHORT *)dps), dst);
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else
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SET_BIT_IN_WORD (dps[dst / SET_WORD_SIZE], dst % SET_WORD_SIZE);
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}
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else
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{
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if (dbl <= SET_CHAR_SIZE) /* store a 0-bit */
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CLEAR_BIT_IN_CHAR (*((SET_CHAR *)dps), dst);
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else if (dbl <= SET_SHORT_SIZE)
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CLEAR_BIT_IN_SHORT (*((SET_SHORT *)dps), dst);
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else
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CLEAR_BIT_IN_WORD (dps[dst / SET_WORD_SIZE], dst % SET_WORD_SIZE);
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}
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}
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if (dbl <= SET_CHAR_SIZE) /* clear unused bits in output bitstring */
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{
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MASK_UNUSED_CHAR_BITS ((SET_CHAR *)dps, dbl);
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}
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else if (dbl <= SET_SHORT_SIZE)
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{
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MASK_UNUSED_SHORT_BITS ((SET_SHORT *)dps, dbl);
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}
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else
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{
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MASK_UNUSED_WORD_BITS ((SET_WORD *)(dps + (dbl/SET_WORD_SIZE)),
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dbl % SET_WORD_SIZE);
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}
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}
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