Add native Windows binary for bison.

bison/src/bison/2.4.1/bison-2.4.1-src/lib/vbitset.c

+/* Variable array bitsets.
+   Copyright (C) 2002, 2003, 2004, 2005, 2006 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
+   it under the terms of the GNU General Public License as published by
+   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,
+   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 this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#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.
+
+   Note that binary or ternary operations assume that each bitset operand
+   has the same size.
+*/
+
+static void vbitset_unused_clear (bitset);
+
+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_reverse (bitset, 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))
+
+static bitset_bindex
+vbitset_resize (bitset src, bitset_bindex n_bits)
+{
+  bitset_windex oldsize;
+  bitset_windex newsize;
+
+  if (n_bits == BITSET_NBITS_ (src))
+    return n_bits;
+
+  oldsize = VBITSET_SIZE (src);
+  newsize = VBITSET_N_WORDS (n_bits);
+
+  if (oldsize < newsize)
+    {
+      bitset_windex size;
+
+      /* 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));
+      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.  */
+      if ((oldsize - newsize) >= oldsize / 2)
+        {
+          VBITSET_WORDS (src)
+            = realloc (VBITSET_WORDS (src), newsize * sizeof (bitset_word));
+          VBITSET_ASIZE (src) = newsize;
+        }
+
+      /* Need to prune any excess bits.  FIXME.  */
+
+      VBITSET_SIZE (src) = newsize;
+    }
+
+  BITSET_NBITS_ (src) = n_bits;
+  return n_bits;
+}
+
+
+/* Set bit BITNO in bitset DST.  */
+static void
+vbitset_set (dst, bitno)
+     bitset dst;
+     bitset_bindex bitno;
+{
+  bitset_windex windex = bitno / BITSET_WORD_BITS;
+
+  /* Perhaps we should abort.  The user should explicitly call
+     bitset_resize since this will not catch the case when we set a
+     bit larger than the current size but smaller than the allocated
+     size.  */
+  vbitset_resize (dst, bitno);
+
+  dst->b.cdata[windex - dst->b.cindex] |=
+    (bitset_word) 1 << (bitno % BITSET_WORD_BITS);
+}
+
+
+/* Reset bit BITNO in bitset DST.  */
+static void
+vbitset_reset (dst, bitno)
+     bitset dst ATTRIBUTE_UNUSED;
+     bitset_bindex bitno ATTRIBUTE_UNUSED;
+{
+  /* We must be accessing outside the cache so the bit is
+     zero anyway.  */
+}
+
+
+/* Test bit BITNO in bitset SRC.  */
+static bool
+vbitset_test (src, bitno)
+     bitset src ATTRIBUTE_UNUSED;
+     bitset_bindex bitno ATTRIBUTE_UNUSED;
+{
+  /* We must be accessing outside the cache so the bit is
+     zero anyway.  */
+  return 0;
+}
+
+
+/* Find list of up to NUM bits set in BSET in reverse order, starting
+   from and including NEXT and store in array LIST.  Return with
+   actual number of bits found and with *NEXT indicating where search
+   stopped.  */
+static bitset_bindex
+vbitset_list_reverse (src, list, num, next)
+     bitset src;
+     bitset_bindex *list;
+     bitset_bindex num;
+     bitset_bindex *next;
+{
+  bitset_bindex bitno;
+  bitset_bindex rbitno;
+  bitset_bindex count;
+  bitset_windex windex;
+  unsigned int bitcnt;
+  bitset_bindex bitoff;
+  bitset_word *srcp = VBITSET_WORDS (src);
+  bitset_bindex n_bits = BITSET_SIZE_ (src);
+
+  rbitno = *next;
+
+  /* If num is 1, we could speed things up with a binary search
+     of the word of interest.  */
+
+  if (rbitno >= n_bits)
+    return 0;
+
+  count = 0;
+
+  bitno = n_bits - (rbitno + 1);
+
+  windex = bitno / BITSET_WORD_BITS;
+  bitcnt = bitno % BITSET_WORD_BITS;
+  bitoff = windex * BITSET_WORD_BITS;
+
+  do
+    {
+      bitset_word word;
+
+      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;
+        }
+      bitoff -= BITSET_WORD_BITS;
+      bitcnt = BITSET_WORD_BITS - 1;
+    }
+  while (windex--);
+
+  *next = n_bits - (bitoff + 1);
+  return count;
+}
+
+
+/* Find list of up to NUM bits set in BSET starting from and including
+ *NEXT and store in array LIST.  Return with actual number of bits
+ found and with *NEXT indicating where search stopped.  */
+static bitset_bindex
+vbitset_list (src, list, num, next)
+     bitset src;
+     bitset_bindex *list;
+     bitset_bindex num;
+     bitset_bindex *next;
+{
+  bitset_bindex bitno;
+  bitset_bindex count;
+  bitset_windex windex;
+  bitset_bindex bitoff;
+  bitset_windex size = VBITSET_SIZE (src);
+  bitset_word *srcp = VBITSET_WORDS (src);
+  bitset_word word;
+
+  bitno = *next;
+
+  count = 0;
+  if (!bitno)
+    {
+      /* Many bitsets are zero, so make this common case fast.  */
+      for (windex = 0; windex < size && !srcp[windex]; windex++)
+        continue;
+      if (windex >= size)
+        return 0;
+
+      /* If num is 1, we could speed things up with a binary search
+         of the current word.  */
+
+      bitoff = windex * BITSET_WORD_BITS;
+    }
+  else
+    {
+      if (bitno >= BITSET_SIZE_ (src))
+        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++;
+        }
+      bitoff = windex * BITSET_WORD_BITS;
+    }
+
+  for (; windex < size; windex++, bitoff += BITSET_WORD_BITS)
+    {
+      if (!(word = srcp[windex]))
+        continue;
+
+      if ((count + BITSET_WORD_BITS) < num)
+        {
+          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;
+            }
+        }
+    }
+
+  *next = bitoff;
+  return count;
+}
+
+
+/* Ensure that any unused bits within the last word are clear.  */
+static inline void
+vbitset_unused_clear (dst)
+     bitset dst;
+{
+  unsigned int last_bit;
+
+  last_bit = BITSET_SIZE_ (dst) % BITSET_WORD_BITS;
+  if (last_bit)
+    VBITSET_WORDS (dst)[VBITSET_SIZE (dst) - 1] &=
+      ((bitset_word) 1 << last_bit) - 1;
+}
+
+
+static void
+vbitset_ones (bitset dst)
+{
+  bitset_word *dstp = VBITSET_WORDS (dst);
+  unsigned int bytes;
+
+  bytes = sizeof (bitset_word) * VBITSET_SIZE (dst);
+
+  memset (dstp, -1, bytes);
+  vbitset_unused_clear (dst);
+}
+
+
+static void
+vbitset_zero (bitset dst)
+{
+  bitset_word *dstp = VBITSET_WORDS (dst);
+  unsigned int bytes;
+
+  bytes = sizeof (bitset_word) * VBITSET_SIZE (dst);
+
+  memset (dstp, 0, bytes);
+}
+
+
+static bool
+vbitset_empty_p (bitset dst)
+{
+  unsigned int i;
+  bitset_word *dstp = VBITSET_WORDS (dst);
+
+  for (i = 0; i < VBITSET_SIZE (dst); i++)
+    if (dstp[i])
+      return 0;
+
+  return 1;
+}
+
+
+static void
+vbitset_copy1 (bitset dst, bitset src)
+{
+  bitset_word *srcp;
+  bitset_word *dstp;
+  bitset_windex ssize;
+  bitset_windex dsize;
+
+  if (src == dst)
+      return;
+
+  vbitset_resize (dst, BITSET_SIZE_ (src));
+
+  srcp = VBITSET_WORDS (src);
+  dstp = VBITSET_WORDS (dst);
+  ssize = VBITSET_SIZE (src);
+  dsize = VBITSET_SIZE (dst);
+
+  memcpy (dstp, srcp, sizeof (bitset_word) * ssize);
+
+  memset (dstp + sizeof (bitset_word) * ssize, 0,
+          sizeof (bitset_word) * (dsize - ssize));
+}
+
+
+static void
+vbitset_not (bitset dst, bitset src)
+{
+  unsigned int i;
+  bitset_word *srcp;
+  bitset_word *dstp;
+  bitset_windex ssize;
+  bitset_windex dsize;
+
+  vbitset_resize (dst, BITSET_SIZE_ (src));
+
+  srcp = VBITSET_WORDS (src);
+  dstp = VBITSET_WORDS (dst);
+  ssize = VBITSET_SIZE (src);
+  dsize = VBITSET_SIZE (dst);
+
+  for (i = 0; i < ssize; i++)
+      *dstp++ = ~(*srcp++);
+
+  vbitset_unused_clear (dst);
+  memset (dstp + sizeof (bitset_word) * ssize, 0,
+          sizeof (bitset_word) * (dsize - ssize));
+}
+
+
+static bool
+vbitset_equal_p (bitset dst, bitset src)
+{
+  unsigned int i;
+  bitset_word *srcp = VBITSET_WORDS (src);
+  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++)
+      if (*srcp++ != *dstp++)
+          return 0;
+
+  if (ssize > dsize)
+    {
+      for (; i < ssize; i++)
+        if (*srcp++)
+          return 0;
+    }
+  else
+    {
+      for (; i < dsize; i++)
+        if (*dstp++)
+          return 0;
+    }
+
+  return 1;
+}
+
+
+static bool
+vbitset_subset_p (bitset dst, bitset src)
+{
+  unsigned int i;
+  bitset_word *srcp = VBITSET_WORDS (src);
+  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;
+
+  if (ssize > dsize)
+    {
+      for (; i < ssize; i++)
+        if (*srcp++)
+          return 0;
+    }
+
+  return 1;
+}
+
+
+static bool
+vbitset_disjoint_p (bitset dst, bitset src)
+{
+  unsigned int i;
+  bitset_word *srcp = VBITSET_WORDS (src);
+  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++)
+      if (*srcp++ & *dstp++)
+          return 0;
+
+  return 1;
+}
+
+
+static void
+vbitset_and (bitset dst, bitset src1, bitset src2)
+{
+  unsigned int i;
+  bitset_word *src1p;
+  bitset_word *src2p;
+  bitset_word *dstp;
+  bitset_windex ssize1;
+  bitset_windex ssize2;
+  bitset_windex dsize;
+
+  vbitset_resize (dst, max (BITSET_SIZE_ (src1), BITSET_SIZE_ (src2)));
+
+  dsize = VBITSET_SIZE (dst);
+  ssize1 = VBITSET_SIZE (src1);
+  ssize2 = VBITSET_SIZE (src2);
+  dstp = VBITSET_WORDS (dst);
+  src1p = VBITSET_WORDS (src1);
+  src2p = VBITSET_WORDS (src2);
+
+  for (i = 0; i < min (ssize1, ssize2); i++)
+      *dstp++ = *src1p++ & *src2p++;
+
+  memset (dstp, 0, sizeof (bitset_word) * (dsize - min (ssize1, ssize2)));
+}
+
+
+static bool
+vbitset_and_cmp (bitset dst, bitset src1, bitset src2)
+{
+  unsigned int i;
+  int changed = 0;
+  bitset_word *src1p;
+  bitset_word *src2p;
+  bitset_word *dstp;
+  bitset_windex ssize1;
+  bitset_windex ssize2;
+  bitset_windex dsize;
+
+  vbitset_resize (dst, max (BITSET_SIZE_ (src1), BITSET_SIZE_ (src2)));
+
+  dsize = VBITSET_SIZE (dst);
+  ssize1 = VBITSET_SIZE (src1);
+  ssize2 = VBITSET_SIZE (src2);
+  dstp = VBITSET_WORDS (dst);
+  src1p = VBITSET_WORDS (src1);
+  src2p = VBITSET_WORDS (src2);
+
+  for (i = 0; i < min (ssize1, ssize2); i++, dstp++)
+    {
+      bitset_word tmp = *src1p++ & *src2p++;
+
+      if (*dstp != tmp)
+        {
+          changed = 1;
+          *dstp = tmp;
+        }
+    }
+
+  if (ssize2 > ssize1)
+    {
+      src1p = src2p;
+      ssize1 = ssize2;
+    }
+
+  for (; i < ssize1; i++, dstp++)
+    {
+      if (*dstp != 0)
+        {
+          changed = 1;
+          *dstp = 0;
+        }
+    }
+
+  memset (dstp, 0, sizeof (bitset_word) * (dsize - ssize1));
+
+  return changed;
+}
+
+
+static void
+vbitset_andn (bitset dst, bitset src1, bitset src2)
+{
+  unsigned int i;
+  bitset_word *src1p;
+  bitset_word *src2p;
+  bitset_word *dstp;
+  bitset_windex ssize1;
+  bitset_windex ssize2;
+  bitset_windex dsize;
+
+  vbitset_resize (dst, max (BITSET_SIZE_ (src1), BITSET_SIZE_ (src2)));
+
+  dsize = VBITSET_SIZE (dst);
+  ssize1 = VBITSET_SIZE (src1);
+  ssize2 = VBITSET_SIZE (src2);
+  dstp = VBITSET_WORDS (dst);
+  src1p = VBITSET_WORDS (src1);
+  src2p = VBITSET_WORDS (src2);
+
+  for (i = 0; i < min (ssize1, ssize2); i++)
+      *dstp++ = *src1p++ & ~(*src2p++);
+
+  if (ssize2 > ssize1)
+    {
+      for (; i < ssize2; i++)
+        *dstp++ = 0;
+
+      memset (dstp, 0, sizeof (bitset_word) * (dsize - ssize2));
+    }
+  else
+    {
+      for (; i < ssize1; i++)
+        *dstp++ = *src1p++;
+
+      memset (dstp, 0, sizeof (bitset_word) * (dsize - ssize1));
+    }
+}
+
+
+static bool
+vbitset_andn_cmp (bitset dst, bitset src1, bitset src2)
+{
+  unsigned int i;
+  int changed = 0;
+  bitset_word *src1p;
+  bitset_word *src2p;
+  bitset_word *dstp;
+  bitset_windex ssize1;
+  bitset_windex ssize2;
+  bitset_windex dsize;
+
+  vbitset_resize (dst, max (BITSET_SIZE_ (src1), BITSET_SIZE_ (src2)));
+
+  dsize = VBITSET_SIZE (dst);
+  ssize1 = VBITSET_SIZE (src1);
+  ssize2 = VBITSET_SIZE (src2);
+  dstp = VBITSET_WORDS (dst);
+  src1p = VBITSET_WORDS (src1);
+  src2p = VBITSET_WORDS (src2);
+
+  for (i = 0; i < min (ssize1, ssize2); i++, dstp++)
+    {
+      bitset_word tmp = *src1p++ & ~(*src2p++);
+
+      if (*dstp != tmp)
+        {
+          changed = 1;
+          *dstp = tmp;
+        }
+    }
+
+  if (ssize2 > ssize1)
+    {
+      for (; i < ssize2; i++, dstp++)
+        {
+          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;
+            }
+        }
+
+      memset (dstp, 0, sizeof (bitset_word) * (dsize - ssize1));
+    }
+
+  return changed;
+}
+
+
+static void
+vbitset_or (bitset dst, bitset src1, bitset src2)
+{
+  unsigned int i;
+  bitset_word *src1p;
+  bitset_word *src2p;
+  bitset_word *dstp;
+  bitset_windex ssize1;
+  bitset_windex ssize2;
+  bitset_windex dsize;
+
+  vbitset_resize (dst, max (BITSET_SIZE_ (src1), BITSET_SIZE_ (src2)));
+
+  dsize = VBITSET_SIZE (dst);
+  ssize1 = VBITSET_SIZE (src1);
+  ssize2 = VBITSET_SIZE (src2);
+  dstp = VBITSET_WORDS (dst);
+  src1p = VBITSET_WORDS (src1);
+  src2p = VBITSET_WORDS (src2);
+
+  for (i = 0; i < min (ssize1, ssize2); i++)
+      *dstp++ = *src1p++ | *src2p++;
+
+  if (ssize2 > ssize1)
+    {
+      src1p = src2p;
+      ssize1 = ssize2;
+    }
+
+  for (; i < ssize1; i++)
+    *dstp++ = *src1p++;
+
+  memset (dstp, 0, sizeof (bitset_word) * (dsize - ssize1));
+}
+
+
+static bool
+vbitset_or_cmp (bitset dst, bitset src1, bitset src2)
+{
+  unsigned int i;
+  int changed = 0;
+  bitset_word *src1p;
+  bitset_word *src2p;
+  bitset_word *dstp;
+  bitset_windex ssize1;
+  bitset_windex ssize2;
+  bitset_windex dsize;
+
+  vbitset_resize (dst, max (BITSET_SIZE_ (src1), BITSET_SIZE_ (src2)));
+
+  dsize = VBITSET_SIZE (dst);
+  ssize1 = VBITSET_SIZE (src1);
+  ssize2 = VBITSET_SIZE (src2);
+  dstp = VBITSET_WORDS (dst);
+  src1p = VBITSET_WORDS (src1);
+  src2p = VBITSET_WORDS (src2);
+
+  for (i = 0; i < min (ssize1, ssize2); i++, dstp++)
+    {
+      bitset_word tmp = *src1p++ | *src2p++;
+
+      if (*dstp != tmp)
+        {
+          changed = 1;
+          *dstp = tmp;
+        }
+    }
+
+  if (ssize2 > ssize1)
+    {
+      src1p = src2p;
+      ssize1 = ssize2;
+    }
+
+  for (; i < ssize1; i++, dstp++)
+    {
+      bitset_word tmp = *src1p++;
+
+      if (*dstp != tmp)
+        {
+          changed = 1;
+          *dstp = tmp;
+        }
+    }
+
+  memset (dstp, 0, sizeof (bitset_word) * (dsize - ssize1));
+
+  return changed;
+}
+
+
+static void
+vbitset_xor (bitset dst, bitset src1, bitset src2)
+{
+  unsigned int i;
+  bitset_word *src1p;
+  bitset_word *src2p;
+  bitset_word *dstp;
+  bitset_windex ssize1;
+  bitset_windex ssize2;
+  bitset_windex dsize;
+
+  vbitset_resize (dst, max (BITSET_SIZE_ (src1), BITSET_SIZE_ (src2)));
+
+  dsize = VBITSET_SIZE (dst);
+  ssize1 = VBITSET_SIZE (src1);
+  ssize2 = VBITSET_SIZE (src2);
+  dstp = VBITSET_WORDS (dst);
+  src1p = VBITSET_WORDS (src1);
+  src2p = VBITSET_WORDS (src2);
+
+  for (i = 0; i < min (ssize1, ssize2); i++)
+      *dstp++ = *src1p++ ^ *src2p++;
+
+  if (ssize2 > ssize1)
+    {
+      src1p = src2p;
+      ssize1 = ssize2;
+    }
+
+  for (; i < ssize1; i++)
+    *dstp++ = *src1p++;
+
+  memset (dstp, 0, sizeof (bitset_word) * (dsize - ssize1));
+}
+
+
+static bool
+vbitset_xor_cmp (bitset dst, bitset src1, bitset src2)
+{
+  unsigned int i;
+  int changed = 0;
+  bitset_word *src1p;
+  bitset_word *src2p;
+  bitset_word *dstp;
+  bitset_windex ssize1;
+  bitset_windex ssize2;
+  bitset_windex dsize;
+
+  vbitset_resize (dst, max (BITSET_SIZE_ (src1), BITSET_SIZE_ (src2)));
+
+  dsize = VBITSET_SIZE (dst);
+  ssize1 = VBITSET_SIZE (src1);
+  ssize2 = VBITSET_SIZE (src2);
+  dstp = VBITSET_WORDS (dst);
+  src1p = VBITSET_WORDS (src1);
+  src2p = VBITSET_WORDS (src2);
+
+  for (i = 0; i < min (ssize1, ssize2); i++, dstp++)
+    {
+      bitset_word tmp = *src1p++ ^ *src2p++;
+
+      if (*dstp != tmp)
+        {
+          changed = 1;
+          *dstp = tmp;
+        }
+    }
+
+  if (ssize2 > ssize1)
+    {
+      src1p = src2p;
+      ssize1 = ssize2;
+    }
+
+  for (; i < ssize1; i++, dstp++)
+    {
+      bitset_word tmp = *src1p++;
+
+      if (*dstp != tmp)
+        {
+          changed = 1;
+          *dstp = tmp;
+        }
+    }
+
+  memset (dstp, 0, sizeof (bitset_word) * (dsize - ssize1));
+
+  return changed;
+}
+
+
+/* FIXME, these operations need fixing for different size
+   bitsets.  */
+
+static void
+vbitset_and_or (bitset dst, bitset src1, bitset src2, bitset src3)
+{
+  unsigned int i;
+  bitset_word *src1p;
+  bitset_word *src2p;
+  bitset_word *src3p;
+  bitset_word *dstp;
+  bitset_windex size;
+
+  if (BITSET_NBITS_ (src1) != BITSET_NBITS_ (src2)
+      || BITSET_NBITS_ (src1) != BITSET_NBITS_ (src3))
+    {
+      bitset_and_or_ (dst, src1, src2, src3);
+      return;
+    }
+
+  vbitset_resize (dst, BITSET_NBITS_ (src1));
+
+  src1p = VBITSET_WORDS (src1);
+  src2p = VBITSET_WORDS (src2);
+  src3p = VBITSET_WORDS (src3);
+  dstp = VBITSET_WORDS (dst);
+  size = VBITSET_SIZE (dst);
+
+  for (i = 0; i < size; i++)
+      *dstp++ = (*src1p++ & *src2p++) | *src3p++;
+}
+
+
+static bool
+vbitset_and_or_cmp (bitset dst, bitset src1, bitset src2, bitset src3)
+{
+  unsigned int i;
+  int changed = 0;
+  bitset_word *src1p;
+  bitset_word *src2p;
+  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);
+
+  vbitset_resize (dst, BITSET_NBITS_ (src1));
+
+  src1p = VBITSET_WORDS (src1);
+  src2p = VBITSET_WORDS (src2);
+  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;
+        }
+    }
+  return changed;
+}
+
+
+static void
+vbitset_andn_or (bitset dst, bitset src1, bitset src2, bitset src3)
+{
+  unsigned int i;
+  bitset_word *src1p;
+  bitset_word *src2p;
+  bitset_word *src3p;
+  bitset_word *dstp;
+  bitset_windex size;
+
+  if (BITSET_NBITS_ (src1) != BITSET_NBITS_ (src2)
+      || BITSET_NBITS_ (src1) != BITSET_NBITS_ (src3))
+    {
+      bitset_andn_or_ (dst, src1, src2, src3);
+      return;
+    }
+
+  vbitset_resize (dst, BITSET_NBITS_ (src1));
+
+  src1p = VBITSET_WORDS (src1);
+  src2p = VBITSET_WORDS (src2);
+  src3p = VBITSET_WORDS (src3);
+  dstp = VBITSET_WORDS (dst);
+  size = VBITSET_SIZE (dst);
+
+  for (i = 0; i < size; i++)
+      *dstp++ = (*src1p++ & ~(*src2p++)) | *src3p++;
+}
+
+
+static bool
+vbitset_andn_or_cmp (bitset dst, bitset src1, bitset src2, bitset src3)
+{
+  unsigned int i;
+  int changed = 0;
+  bitset_word *src1p;
+  bitset_word *src2p;
+  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);
+
+  vbitset_resize (dst, BITSET_NBITS_ (src1));
+
+  src1p = VBITSET_WORDS (src1);
+  src2p = VBITSET_WORDS (src2);
+  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;
+        }
+    }
+  return changed;
+}
+
+
+static void
+vbitset_or_and (bitset dst, bitset src1, bitset src2, bitset src3)
+{
+  unsigned int i;
+  bitset_word *src1p;
+  bitset_word *src2p;
+  bitset_word *src3p;
+  bitset_word *dstp;
+  bitset_windex size;
+
+  if (BITSET_NBITS_ (src1) != BITSET_NBITS_ (src2)
+      || BITSET_NBITS_ (src1) != BITSET_NBITS_ (src3))
+    {
+      bitset_or_and_ (dst, src1, src2, src3);
+      return;
+    }
+
+  vbitset_resize (dst, BITSET_NBITS_ (src1));
+
+  src1p = VBITSET_WORDS (src1);
+  src2p = VBITSET_WORDS (src2);
+  src3p = VBITSET_WORDS (src3);
+  dstp = VBITSET_WORDS (dst);
+  size = VBITSET_SIZE (dst);
+
+  for (i = 0; i < size; i++)
+      *dstp++ = (*src1p++ | *src2p++) & *src3p++;
+}
+
+
+static bool
+vbitset_or_and_cmp (bitset dst, bitset src1, bitset src2, bitset src3)
+{
+  unsigned int i;
+  int changed = 0;
+  bitset_word *src1p;
+  bitset_word *src2p;
+  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);
+
+  vbitset_resize (dst, BITSET_NBITS_ (src1));
+
+  src1p = VBITSET_WORDS (src1);
+  src2p = VBITSET_WORDS (src2);
+  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;
+        }
+    }
+  return changed;
+}
+
+
+static void
+vbitset_copy (bitset dst, bitset src)
+{
+  if (BITSET_COMPATIBLE_ (dst, src))
+      vbitset_copy1 (dst, src);
+  else
+      bitset_copy_ (dst, src);
+}
+
+
+/* Vector of operations for multiple word bitsets.  */
+struct bitset_vtable vbitset_vtable = {
+  vbitset_set,
+  vbitset_reset,
+  bitset_toggle_,
+  vbitset_test,
+  vbitset_resize,
+  bitset_size_,
+  bitset_count_,
+  vbitset_empty_p,
+  vbitset_ones,
+  vbitset_zero,
+  vbitset_copy,
+  vbitset_disjoint_p,
+  vbitset_equal_p,
+  vbitset_not,
+  vbitset_subset_p,
+  vbitset_and,
+  vbitset_and_cmp,
+  vbitset_andn,
+  vbitset_andn_cmp,
+  vbitset_or,
+  vbitset_or_cmp,
+  vbitset_xor,
+  vbitset_xor_cmp,
+  vbitset_and_or,
+  vbitset_and_or_cmp,
+  vbitset_andn_or,
+  vbitset_andn_or_cmp,
+  vbitset_or_and,
+  vbitset_or_and_cmp,
+  vbitset_list,
+  vbitset_list_reverse,
+  NULL,
+  BITSET_VARRAY
+};
+
+
+size_t
+vbitset_bytes (n_bits)
+     bitset_bindex n_bits ATTRIBUTE_UNUSED;
+{
+  return sizeof (struct vbitset_struct);
+}
+
+
+bitset
+vbitset_init (bset, n_bits)
+     bitset bset;
+     bitset_bindex n_bits;
+{
+  bset->b.vtable = &vbitset_vtable;
+
+  bset->b.cindex = 0;
+
+  VBITSET_SIZE (bset) = 0;
+  vbitset_resize (bset, n_bits);
+  return bset;
+}