/* Variable array bitsets.
- Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
+
+ Copyright (C) 2002-2006, 2009-2012 Free Software Foundation, Inc.
+
Contributed by Michael Hayes (m.hayes@elec.canterbury.ac.nz).
- This program is free software; you can redistribute it and/or modify
+ This program 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 of the License, or
+ the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-*/
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
+#include <config.h>
#include "vbitset.h"
+
#include <stdlib.h>
#include <string.h>
/* This file implements variable size bitsets stored as a variable
length array of words. Any unused bits in the last word must be
- zero.
+ zero.
Note that binary or ternary operations assume that each bitset operand
has the same size.
static void vbitset_set (bitset, bitset_bindex);
static void vbitset_reset (bitset, bitset_bindex);
static bool vbitset_test (bitset, bitset_bindex);
-static bitset_bindex vbitset_list (bitset, bitset_bindex *,
- bitset_bindex, bitset_bindex *);
+static bitset_bindex vbitset_list (bitset, bitset_bindex *,
+ bitset_bindex, bitset_bindex *);
static bitset_bindex vbitset_list_reverse (bitset, bitset_bindex *,
- bitset_bindex, bitset_bindex *);
+ bitset_bindex, bitset_bindex *);
#define VBITSET_N_WORDS(N) (((N) + BITSET_WORD_BITS - 1) / BITSET_WORD_BITS)
#define VBITSET_WORDS(X) ((X)->b.cdata)
#define VBITSET_SIZE(X) ((X)->b.csize)
#define VBITSET_ASIZE(X) ((X)->v.size)
-
+#undef min
+#undef max
#define min(a, b) ((a) > (b) ? (b) : (a))
#define max(a, b) ((a) > (b) ? (a) : (b))
{
bitset_windex size;
- /* The bitset needs to grow. If we already have enough memory
- allocated, then just zero what we need. */
+ /* The bitset needs to grow. If we already have enough memory
+ allocated, then just zero what we need. */
if (newsize > VBITSET_ASIZE (src))
- {
- /* We need to allocate more memory. When oldsize is
- non-zero this means that we are changing the size, so
- grow the bitset 25% larger than requested to reduce
- number of reallocations. */
-
- if (oldsize == 0)
- size = newsize;
- else
- size = newsize + newsize / 4;
-
- VBITSET_WORDS (src)
- = realloc (VBITSET_WORDS (src), size * sizeof (bitset_word));
- VBITSET_ASIZE (src) = size;
- }
-
- memset (VBITSET_WORDS (src) + oldsize, 0,
- (newsize - oldsize) * sizeof (bitset_word));
+ {
+ /* We need to allocate more memory. When oldsize is
+ non-zero this means that we are changing the size, so
+ grow the bitset 25% larger than requested to reduce
+ number of reallocations. */
+
+ if (oldsize == 0)
+ size = newsize;
+ else
+ size = newsize + newsize / 4;
+
+ VBITSET_WORDS (src)
+ = realloc (VBITSET_WORDS (src), size * sizeof (bitset_word));
+ VBITSET_ASIZE (src) = size;
+ }
+
+ memset (VBITSET_WORDS (src) + oldsize, 0,
+ (newsize - oldsize) * sizeof (bitset_word));
VBITSET_SIZE (src) = newsize;
}
else
{
/* The bitset needs to shrink. There's no point deallocating
- the memory unless it is shrinking by a reasonable amount. */
+ the memory unless it is shrinking by a reasonable amount. */
if ((oldsize - newsize) >= oldsize / 2)
- {
- VBITSET_WORDS (src)
- = realloc (VBITSET_WORDS (src), newsize * sizeof (bitset_word));
- VBITSET_ASIZE (src) = newsize;
- }
+ {
+ VBITSET_WORDS (src)
+ = realloc (VBITSET_WORDS (src), newsize * sizeof (bitset_word));
+ VBITSET_ASIZE (src) = newsize;
+ }
/* Need to prune any excess bits. FIXME. */
word = srcp[windex] << (BITSET_WORD_BITS - 1 - bitcnt);
for (; word; bitcnt--)
- {
- if (word & BITSET_MSB)
- {
- list[count++] = bitoff + bitcnt;
- if (count >= num)
- {
- *next = n_bits - (bitoff + bitcnt);
- return count;
- }
- }
- word <<= 1;
- }
+ {
+ if (word & BITSET_MSB)
+ {
+ list[count++] = bitoff + bitcnt;
+ if (count >= num)
+ {
+ *next = n_bits - (bitoff + bitcnt);
+ return count;
+ }
+ }
+ word <<= 1;
+ }
bitoff -= BITSET_WORD_BITS;
bitcnt = BITSET_WORD_BITS - 1;
}
{
/* Many bitsets are zero, so make this common case fast. */
for (windex = 0; windex < size && !srcp[windex]; windex++)
- continue;
+ continue;
if (windex >= size)
- return 0;
+ return 0;
/* If num is 1, we could speed things up with a binary search
- of the current word. */
+ of the current word. */
bitoff = windex * BITSET_WORD_BITS;
}
else
{
if (bitno >= BITSET_SIZE_ (src))
- return 0;
+ return 0;
windex = bitno / BITSET_WORD_BITS;
bitno = bitno % BITSET_WORD_BITS;
if (bitno)
- {
- /* Handle the case where we start within a word.
- Most often, this is executed with large bitsets
- with many set bits where we filled the array
- on the previous call to this function. */
-
- bitoff = windex * BITSET_WORD_BITS;
- word = srcp[windex] >> bitno;
- for (bitno = bitoff + bitno; word; bitno++)
- {
- if (word & 1)
- {
- list[count++] = bitno;
- if (count >= num)
- {
- *next = bitno + 1;
- return count;
- }
- }
- word >>= 1;
- }
- windex++;
- }
+ {
+ /* Handle the case where we start within a word.
+ Most often, this is executed with large bitsets
+ with many set bits where we filled the array
+ on the previous call to this function. */
+
+ bitoff = windex * BITSET_WORD_BITS;
+ word = srcp[windex] >> bitno;
+ for (bitno = bitoff + bitno; word; bitno++)
+ {
+ if (word & 1)
+ {
+ list[count++] = bitno;
+ if (count >= num)
+ {
+ *next = bitno + 1;
+ return count;
+ }
+ }
+ word >>= 1;
+ }
+ windex++;
+ }
bitoff = windex * BITSET_WORD_BITS;
}
for (; windex < size; windex++, bitoff += BITSET_WORD_BITS)
{
if (!(word = srcp[windex]))
- continue;
+ continue;
if ((count + BITSET_WORD_BITS) < num)
- {
- for (bitno = bitoff; word; bitno++)
- {
- if (word & 1)
- list[count++] = bitno;
- word >>= 1;
- }
- }
+ {
+ for (bitno = bitoff; word; bitno++)
+ {
+ if (word & 1)
+ list[count++] = bitno;
+ word >>= 1;
+ }
+ }
else
- {
- for (bitno = bitoff; word; bitno++)
- {
- if (word & 1)
- {
- list[count++] = bitno;
- if (count >= num)
- {
- *next = bitno + 1;
- return count;
- }
- }
- word >>= 1;
- }
- }
+ {
+ for (bitno = bitoff; word; bitno++)
+ {
+ if (word & 1)
+ {
+ list[count++] = bitno;
+ if (count >= num)
+ {
+ *next = bitno + 1;
+ return count;
+ }
+ }
+ word >>= 1;
+ }
+ }
}
*next = bitoff;
memcpy (dstp, srcp, sizeof (bitset_word) * ssize);
memset (dstp + sizeof (bitset_word) * ssize, 0,
- sizeof (bitset_word) * (dsize - ssize));
+ sizeof (bitset_word) * (dsize - ssize));
}
vbitset_unused_clear (dst);
memset (dstp + sizeof (bitset_word) * ssize, 0,
- sizeof (bitset_word) * (dsize - ssize));
+ sizeof (bitset_word) * (dsize - ssize));
}
-
+
static bool
vbitset_equal_p (bitset dst, bitset src)
{
for (i = 0; i < min (ssize, dsize); i++)
if (*srcp++ != *dstp++)
- return 0;
+ return 0;
if (ssize > dsize)
{
for (; i < ssize; i++)
- if (*srcp++)
- return 0;
+ if (*srcp++)
+ return 0;
}
else
{
for (; i < dsize; i++)
- if (*dstp++)
- return 0;
+ if (*dstp++)
+ return 0;
}
return 1;
bitset_word *dstp = VBITSET_WORDS (dst);
bitset_windex ssize = VBITSET_SIZE (src);
bitset_windex dsize = VBITSET_SIZE (dst);
-
+
for (i = 0; i < min (ssize, dsize); i++, dstp++, srcp++)
if (*dstp != (*srcp | *dstp))
- return 0;
+ return 0;
if (ssize > dsize)
{
for (; i < ssize; i++)
- if (*srcp++)
- return 0;
+ if (*srcp++)
+ return 0;
}
return 1;
for (i = 0; i < min (ssize, dsize); i++)
if (*srcp++ & *dstp++)
- return 0;
+ return 0;
return 1;
}
for (i = 0; i < min (ssize1, ssize2); i++)
*dstp++ = *src1p++ & *src2p++;
-
+
memset (dstp, 0, sizeof (bitset_word) * (dsize - min (ssize1, ssize2)));
}
for (i = 0; i < min (ssize1, ssize2); i++, dstp++)
{
bitset_word tmp = *src1p++ & *src2p++;
-
+
if (*dstp != tmp)
- {
- changed = 1;
- *dstp = tmp;
- }
+ {
+ changed = 1;
+ *dstp = tmp;
+ }
}
-
+
if (ssize2 > ssize1)
{
src1p = src2p;
for (; i < ssize1; i++, dstp++)
{
if (*dstp != 0)
- {
- changed = 1;
- *dstp = 0;
- }
+ {
+ changed = 1;
+ *dstp = 0;
+ }
}
memset (dstp, 0, sizeof (bitset_word) * (dsize - ssize1));
for (i = 0; i < min (ssize1, ssize2); i++)
*dstp++ = *src1p++ & ~(*src2p++);
-
+
if (ssize2 > ssize1)
{
for (; i < ssize2; i++)
- *dstp++ = 0;
+ *dstp++ = 0;
memset (dstp, 0, sizeof (bitset_word) * (dsize - ssize2));
}
else
{
for (; i < ssize1; i++)
- *dstp++ = *src1p++;
+ *dstp++ = *src1p++;
memset (dstp, 0, sizeof (bitset_word) * (dsize - ssize1));
}
for (i = 0; i < min (ssize1, ssize2); i++, dstp++)
{
bitset_word tmp = *src1p++ & ~(*src2p++);
-
+
if (*dstp != tmp)
- {
- changed = 1;
- *dstp = tmp;
- }
+ {
+ changed = 1;
+ *dstp = tmp;
+ }
}
-
+
if (ssize2 > ssize1)
{
for (; i < ssize2; i++, dstp++)
- {
- if (*dstp != 0)
- {
- changed = 1;
- *dstp = 0;
- }
- }
+ {
+ if (*dstp != 0)
+ {
+ changed = 1;
+ *dstp = 0;
+ }
+ }
memset (dstp, 0, sizeof (bitset_word) * (dsize - ssize2));
}
else
{
for (; i < ssize1; i++, dstp++)
- {
- bitset_word tmp = *src1p++;
-
- if (*dstp != tmp)
- {
- changed = 1;
- *dstp = tmp;
- }
- }
+ {
+ bitset_word tmp = *src1p++;
+
+ if (*dstp != tmp)
+ {
+ changed = 1;
+ *dstp = tmp;
+ }
+ }
memset (dstp, 0, sizeof (bitset_word) * (dsize - ssize1));
}
for (i = 0; i < min (ssize1, ssize2); i++)
*dstp++ = *src1p++ | *src2p++;
-
+
if (ssize2 > ssize1)
{
src1p = src2p;
for (i = 0; i < min (ssize1, ssize2); i++, dstp++)
{
bitset_word tmp = *src1p++ | *src2p++;
-
+
if (*dstp != tmp)
- {
- changed = 1;
- *dstp = tmp;
- }
+ {
+ changed = 1;
+ *dstp = tmp;
+ }
}
-
+
if (ssize2 > ssize1)
{
src1p = src2p;
for (; i < ssize1; i++, dstp++)
{
bitset_word tmp = *src1p++;
-
+
if (*dstp != tmp)
- {
- changed = 1;
- *dstp = tmp;
- }
+ {
+ changed = 1;
+ *dstp = tmp;
+ }
}
memset (dstp, 0, sizeof (bitset_word) * (dsize - ssize1));
for (i = 0; i < min (ssize1, ssize2); i++)
*dstp++ = *src1p++ ^ *src2p++;
-
+
if (ssize2 > ssize1)
{
src1p = src2p;
for (i = 0; i < min (ssize1, ssize2); i++, dstp++)
{
bitset_word tmp = *src1p++ ^ *src2p++;
-
+
if (*dstp != tmp)
- {
- changed = 1;
- *dstp = tmp;
- }
+ {
+ changed = 1;
+ *dstp = tmp;
+ }
}
-
+
if (ssize2 > ssize1)
{
src1p = src2p;
for (; i < ssize1; i++, dstp++)
{
bitset_word tmp = *src1p++;
-
+
if (*dstp != tmp)
- {
- changed = 1;
- *dstp = tmp;
- }
+ {
+ changed = 1;
+ *dstp = tmp;
+ }
}
memset (dstp, 0, sizeof (bitset_word) * (dsize - ssize1));
bitset_word *src3p;
bitset_word *dstp;
bitset_windex size;
-
+
if (BITSET_NBITS_ (src1) != BITSET_NBITS_ (src2)
|| BITSET_NBITS_ (src1) != BITSET_NBITS_ (src3))
{
bitset_word *src3p;
bitset_word *dstp;
bitset_windex size;
-
+
if (BITSET_NBITS_ (src1) != BITSET_NBITS_ (src2)
|| BITSET_NBITS_ (src1) != BITSET_NBITS_ (src3))
return bitset_and_or_cmp_ (dst, src1, src2, src3);
src3p = VBITSET_WORDS (src3);
dstp = VBITSET_WORDS (dst);
size = VBITSET_SIZE (dst);
-
+
for (i = 0; i < size; i++, dstp++)
{
bitset_word tmp = (*src1p++ & *src2p++) | *src3p++;
-
+
if (*dstp != tmp)
- {
- changed = 1;
- *dstp = tmp;
- }
+ {
+ changed = 1;
+ *dstp = tmp;
+ }
}
return changed;
}
bitset_word *src3p;
bitset_word *dstp;
bitset_windex size;
-
+
if (BITSET_NBITS_ (src1) != BITSET_NBITS_ (src2)
|| BITSET_NBITS_ (src1) != BITSET_NBITS_ (src3))
{
bitset_word *src3p;
bitset_word *dstp;
bitset_windex size;
-
+
if (BITSET_NBITS_ (src1) != BITSET_NBITS_ (src2)
|| BITSET_NBITS_ (src1) != BITSET_NBITS_ (src3))
return bitset_andn_or_cmp_ (dst, src1, src2, src3);
src3p = VBITSET_WORDS (src3);
dstp = VBITSET_WORDS (dst);
size = VBITSET_SIZE (dst);
-
+
for (i = 0; i < size; i++, dstp++)
{
bitset_word tmp = (*src1p++ & ~(*src2p++)) | *src3p++;
-
+
if (*dstp != tmp)
- {
- changed = 1;
- *dstp = tmp;
- }
+ {
+ changed = 1;
+ *dstp = tmp;
+ }
}
return changed;
}
bitset_word *src3p;
bitset_word *dstp;
bitset_windex size;
-
+
if (BITSET_NBITS_ (src1) != BITSET_NBITS_ (src2)
|| BITSET_NBITS_ (src1) != BITSET_NBITS_ (src3))
{
src3p = VBITSET_WORDS (src3);
dstp = VBITSET_WORDS (dst);
size = VBITSET_SIZE (dst);
-
+
for (i = 0; i < size; i++)
*dstp++ = (*src1p++ | *src2p++) & *src3p++;
}
bitset_word *src3p;
bitset_word *dstp;
bitset_windex size;
-
+
if (BITSET_NBITS_ (src1) != BITSET_NBITS_ (src2)
|| BITSET_NBITS_ (src1) != BITSET_NBITS_ (src3))
return bitset_or_and_cmp_ (dst, src1, src2, src3);
src3p = VBITSET_WORDS (src3);
dstp = VBITSET_WORDS (dst);
size = VBITSET_SIZE (dst);
-
+
for (i = 0; i < size; i++, dstp++)
{
bitset_word tmp = (*src1p++ | *src2p++) & *src3p++;
-
+
if (*dstp != tmp)
- {
- changed = 1;
- *dstp = tmp;
- }
+ {
+ changed = 1;
+ *dstp = tmp;
+ }
}
return changed;
}
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