* djgpp/config.site: Adjustments concerning the use of autoconf 2.61.

[bison.git] / lib / ebitset.c

diff --git a/lib/ebitset.c b/lib/ebitset.c
index 11b02c848fd2d2089a7de638376f7924ae642564..ceebde2584caaaf0f152b6abf06121f9c91788dd 100644 (file)
--- a/lib/ebitset.c
+++ b/lib/ebitset.c
@@ -1,5 +1,5 @@
 /* Functions to support expandable bitsets.
 /* Functions to support expandable bitsets.

-   Copyright (C) 2002 Free Software Foundation, Inc.
+   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
    Contributed by Michael Hayes (m.hayes@elec.canterbury.ac.nz).
 
    This program is free software; you can redistribute it and/or modify


@@ -13,17 +13,16 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-*/
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */

 
 

-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
+#include <config.h>

 
 #include "ebitset.h"
 
 #include "ebitset.h"

+

 #include "obstack.h"
 #include <stdlib.h>
 #include "obstack.h"
 #include <stdlib.h>

+#include <string.h>

 
 /* This file implements expandable bitsets.  These bitsets can be of
    arbitrary length and are more efficient than arrays of bits for
 
 /* This file implements expandable bitsets.  These bitsets can be of
    arbitrary length and are more efficient than arrays of bits for


@@ -51,7 +50,7 @@
 
 /* Number of bits stored in each element.  */
 #define EBITSET_ELT_BITS \
 
 /* Number of bits stored in each element.  */
 #define EBITSET_ELT_BITS \

-  ((unsigned) (EBITSET_ELT_WORDS * BITSET_WORD_BITS))
+  ((unsigned int) (EBITSET_ELT_WORDS * BITSET_WORD_BITS))

 
 /* Ebitset element.  We use an array of bits.  */
 typedef struct ebitset_elt_struct
 
 /* Ebitset element.  We use an array of bits.  */
 typedef struct ebitset_elt_struct


@@ -75,11 +74,6 @@ typedef ebitset_elt *ebitset_elts;
 #define EBITSET_INITIAL_SIZE 2
 #endif
 
 #define EBITSET_INITIAL_SIZE 2
 #endif
 

-/* Minimum number of elements to grow table.  */
-
-#ifndef EBITSET_GROW_SIZE
-#define EBITSET_GROW_SIZE 4
-#endif

 
 enum ebitset_find_mode
   { EBITSET_FIND, EBITSET_CREATE, EBITSET_SUBST };
 
 enum ebitset_find_mode
   { EBITSET_FIND, EBITSET_CREATE, EBITSET_SUBST };


@@ -88,11 +82,13 @@ static ebitset_elt ebitset_zero_elts[1]; /* Elements of all zero bits.  */
 
 /* Obstack to allocate bitset elements from.  */
 static struct obstack ebitset_obstack;
 
 /* Obstack to allocate bitset elements from.  */
 static struct obstack ebitset_obstack;

-static int ebitset_obstack_init = 0;
+static bool ebitset_obstack_init = false;

 static ebitset_elt *ebitset_free_list; /* Free list of bitset elements.  */
 
 static ebitset_elt *ebitset_free_list; /* Free list of bitset elements.  */
 

+#define EBITSET_N_ELTS(N) (((N) + EBITSET_ELT_BITS - 1) / EBITSET_ELT_BITS)

 #define EBITSET_ELTS(BSET) ((BSET)->e.elts)
 #define EBITSET_ELTS(BSET) ((BSET)->e.elts)

-#define EBITSET_SIZE(BSET) ((BSET)->e.size)
+#define EBITSET_SIZE(BSET) EBITSET_N_ELTS (BITSET_NBITS_ (BSET))
+#define EBITSET_ASIZE(BSET) ((BSET)->e.size)

 
 #define EBITSET_NEXT(ELT) ((ELT)->u.next)
 #define EBITSET_WORDS(ELT) ((ELT)->u.words)
 
 #define EBITSET_NEXT(ELT) ((ELT)->u.next)
 #define EBITSET_WORDS(ELT) ((ELT)->u.words)


@@ -117,25 +113,65 @@ static ebitset_elt *ebitset_free_list;    /* Free list of bitset elements.  */
  ((BSET)->b.cindex = (EINDEX) * EBITSET_ELT_WORDS, \
   (BSET)->b.cdata = EBITSET_WORDS (EBITSET_ELTS (BSET) [EINDEX]))
 
  ((BSET)->b.cindex = (EINDEX) * EBITSET_ELT_WORDS, \
   (BSET)->b.cdata = EBITSET_WORDS (EBITSET_ELTS (BSET) [EINDEX]))
 

+#undef min
+#undef max
+#define min(a, b) ((a) > (b) ? (b) : (a))
+#define max(a, b) ((a) > (b) ? (a) : (b))

 
 

-/* Grow the expandable table for BSET by SIZE elements.  */
-static void
-ebitset_elts_grow (bitset bset, bitset_windex size)
+static bitset_bindex
+ebitset_resize (bitset src, bitset_bindex n_bits)

 {
   bitset_windex oldsize;
   bitset_windex newsize;
 
 {
   bitset_windex oldsize;
   bitset_windex newsize;
 

-  oldsize = EBITSET_SIZE (bset);
-  newsize = oldsize + size;
+  if (n_bits == BITSET_NBITS_ (src))
+    return n_bits;

 
 

-  if (BITSET_SIZE_MAX / sizeof (ebitset_elt *) < newsize)
-    xalloc_die ();
+  oldsize = EBITSET_SIZE (src);
+  newsize = EBITSET_N_ELTS (n_bits);
+
+  if (oldsize < newsize)
+    {
+      bitset_windex size;

 
 

-  EBITSET_ELTS (bset) = xrealloc (EBITSET_ELTS (bset),
-                                 newsize * sizeof (ebitset_elt *));
-  EBITSET_SIZE (bset) = newsize;
+      /* The bitset needs to grow.  If we already have enough memory
+        allocated, then just zero what we need.  */
+      if (newsize > EBITSET_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;
+
+         EBITSET_ELTS (src)
+           = realloc (EBITSET_ELTS (src), size * sizeof (ebitset_elt *));
+         EBITSET_ASIZE (src) = size;
+       }
+
+      memset (EBITSET_ELTS (src) + oldsize, 0,
+             (newsize - oldsize) * sizeof (ebitset_elt *));
+    }
+  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)
+       {
+         EBITSET_ELTS (src)
+           = realloc (EBITSET_ELTS (src), newsize * sizeof (ebitset_elt *));
+         EBITSET_ASIZE (src) = newsize;
+       }

 
 

-  memset (EBITSET_ELTS (bset) + oldsize, 0, size * sizeof (ebitset_elt *));
+      /* Need to prune any excess bits.  FIXME.  */
+    }
+
+  BITSET_NBITS_ (src) = n_bits;
+  return n_bits;

 }
 
 
 }
 
 


@@ -154,7 +190,7 @@ ebitset_elt_alloc (void)
     {
       if (!ebitset_obstack_init)
        {
     {
       if (!ebitset_obstack_init)
        {

-         ebitset_obstack_init = 1;
+         ebitset_obstack_init = true;

 
          /* Let particular systems override the size of a chunk.  */
 
 
          /* Let particular systems override the size of a chunk.  */
 


@@ -172,15 +208,13 @@ ebitset_elt_alloc (void)
 #define OBSTACK_CHUNK_FREE free
 #endif
 
 #define OBSTACK_CHUNK_FREE free
 #endif
 

-#if !defined(__GNUC__) || (__GNUC__ < 2)
+#if ! defined __GNUC__ || __GNUC__ < 2

 #define __alignof__(type) 0
 #endif
 
          obstack_specify_allocation (&ebitset_obstack, OBSTACK_CHUNK_SIZE,
                                      __alignof__ (ebitset_elt),
 #define __alignof__(type) 0
 #endif
 
          obstack_specify_allocation (&ebitset_obstack, OBSTACK_CHUNK_SIZE,
                                      __alignof__ (ebitset_elt),

-                                     (void *(*)PARAMS ((long)))

                                      OBSTACK_CHUNK_ALLOC,
                                      OBSTACK_CHUNK_ALLOC,

-                                     (void (*)PARAMS ((void *)))

                                      OBSTACK_CHUNK_FREE);
        }
 
                                      OBSTACK_CHUNK_FREE);
        }
 


@@ -242,22 +276,22 @@ ebitset_elt_add (bitset bset, ebitset_elt *elt, bitset_windex eindex)
 }
 
 
 }
 
 

-/* Return nonzero if all bits in an element are zero.  */
-static inline int
+/* Are all bits in an element zero?  */
+static inline bool

 ebitset_elt_zero_p (ebitset_elt *elt)
 {
   int i;
 
   for (i = 0; i < EBITSET_ELT_WORDS; i++)
     if (EBITSET_WORDS (elt)[i])
 ebitset_elt_zero_p (ebitset_elt *elt)
 {
   int i;
 
   for (i = 0; i < EBITSET_ELT_WORDS; i++)
     if (EBITSET_WORDS (elt)[i])

-      return 0;
+      return false;

 
 

-  return 1;
+  return true;

 }
 
 
 static ebitset_elt *
 }
 
 
 static ebitset_elt *

-ebitset_elt_find (bitset bset, bitset_windex windex,
+ebitset_elt_find (bitset bset, bitset_bindex bindex,

                  enum ebitset_find_mode mode)
 {
   ebitset_elt *elt;
                  enum ebitset_find_mode mode)
 {
   ebitset_elt *elt;


@@ -265,7 +299,7 @@ ebitset_elt_find (bitset bset, bitset_windex windex,
   bitset_windex eindex;
   ebitset_elts *elts;
 
   bitset_windex eindex;
   ebitset_elts *elts;
 

-  eindex = windex / EBITSET_ELT_WORDS;
+  eindex = bindex / EBITSET_ELT_BITS;

 
   elts = EBITSET_ELTS (bset);
   size = EBITSET_SIZE (bset);
 
   elts = EBITSET_ELTS (bset);
   size = EBITSET_SIZE (bset);


@@ -286,26 +320,15 @@ ebitset_elt_find (bitset bset, bitset_windex windex,
 
   switch (mode)
     {
 
   switch (mode)
     {

+    default:
+      abort ();
+

     case EBITSET_FIND:
       return 0;
 
     case EBITSET_CREATE:
       if (eindex >= size)
     case EBITSET_FIND:
       return 0;
 
     case EBITSET_CREATE:
       if (eindex >= size)

-       {
-         bitset_windex extra;
-
-         extra = eindex - size + 1;
-
-         /* We need to expand the table by EXTRA elements.  It may be
-            better with large bitsets to grow the number of
-            elements by some fraction of the current size otherwise
-            we can spend a lot of time slowly increasing the size of the
-            bitset.  */
-         if (extra < EBITSET_GROW_SIZE)
-           extra = EBITSET_GROW_SIZE;
-
-         ebitset_elts_grow (bset, extra);
-       }
+       ebitset_resize (bset, bindex);

 
       /* Create a new element.  */
       elt = ebitset_elt_calloc ();
 
       /* Create a new element.  */
       elt = ebitset_elt_calloc ();


@@ -315,25 +338,10 @@ ebitset_elt_find (bitset bset, bitset_windex windex,
 
     case EBITSET_SUBST:
       return &ebitset_zero_elts[0];
 
     case EBITSET_SUBST:
       return &ebitset_zero_elts[0];

-
-    default:
-      abort ();

     }
 }
 
 
     }
 }
 
 

-static inline ebitset_elt *
-ebitset_elt_last (bitset bset)
-{
-  ebitset_elts *elts;
-
-  elts = EBITSET_ELTS (bset);
-
-  /* Assume that have at least one element in elts.  */
-  return elts[EBITSET_SIZE (bset) - 1];
-}
-
-

 /* Weed out the zero elements from the elts.  */
 static inline bitset_windex
 ebitset_weed (bitset bset)
 /* Weed out the zero elements from the elts.  */
 static inline bitset_windex
 ebitset_weed (bitset bset)


@@ -353,7 +361,7 @@ ebitset_weed (bitset bset)
 
       if (elt)
        {
 
       if (elt)
        {

-         if (elt && ebitset_elt_zero_p (elt))
+         if (ebitset_elt_zero_p (elt))

            {
              ebitset_elt_remove (bset, j);
              count++;
            {
              ebitset_elt_remove (bset, j);
              count++;


@@ -402,7 +410,7 @@ ebitset_zero (bitset bset)
 }
 
 
 }
 
 

-static inline int
+static inline bool

 ebitset_equal_p (bitset dst, bitset src)
 {
   ebitset_elts *selts;
 ebitset_equal_p (bitset dst, bitset src)
 {
   ebitset_elts *selts;


@@ -410,13 +418,13 @@ ebitset_equal_p (bitset dst, bitset src)
   bitset_windex j;
 
   if (src == dst)
   bitset_windex j;
 
   if (src == dst)

-    return 1;
+    return true;

 
   ebitset_weed (dst);
   ebitset_weed (src);
 
   if (EBITSET_SIZE (src) != EBITSET_SIZE (dst))
 
   ebitset_weed (dst);
   ebitset_weed (src);
 
   if (EBITSET_SIZE (src) != EBITSET_SIZE (dst))

-    return 0;
+    return false;

 
   selts = EBITSET_ELTS (src);
   delts = EBITSET_ELTS (dst);
 
   selts = EBITSET_ELTS (src);
   delts = EBITSET_ELTS (dst);


@@ -430,13 +438,13 @@ ebitset_equal_p (bitset dst, bitset src)
       if (!selt && !delt)
        continue;
       if ((selt && !delt) || (!selt && delt))
       if (!selt && !delt)
        continue;
       if ((selt && !delt) || (!selt && delt))

-       return 0;
+       return false;

 
       for (i = 0; i < EBITSET_ELT_WORDS; i++)
        if (EBITSET_WORDS (selt)[i] != EBITSET_WORDS (delt)[i])
 
       for (i = 0; i < EBITSET_ELT_WORDS; i++)
        if (EBITSET_WORDS (selt)[i] != EBITSET_WORDS (delt)[i])

-         return 0;
+         return false;

     }
     }

-  return 1;
+  return true;

 }
 
 
 }
 
 


@@ -453,8 +461,8 @@ ebitset_copy_ (bitset dst, bitset src)
 
   ebitset_zero (dst);
 
 
   ebitset_zero (dst);
 

-  if (EBITSET_SIZE (dst) < EBITSET_SIZE (src))
-    ebitset_elts_grow (dst, EBITSET_SIZE (src) - EBITSET_SIZE (dst));
+  if (BITSET_NBITS_ (dst) != BITSET_NBITS_ (src))
+    ebitset_resize (dst, BITSET_NBITS_ (src));

 
   selts = EBITSET_ELTS (src);
   delts = EBITSET_ELTS (dst);
 
   selts = EBITSET_ELTS (src);
   delts = EBITSET_ELTS (dst);


@@ -476,13 +484,13 @@ ebitset_copy_ (bitset dst, bitset src)
 }
 
 
 }
 
 

-/* Copy bits from bitset SRC to bitset DST.  Return non-zero if
+/* Copy bits from bitset SRC to bitset DST.  Return true if

    bitsets different.  */
    bitsets different.  */

-static inline int
+static inline bool

 ebitset_copy_cmp (bitset dst, bitset src)
 {
   if (src == dst)
 ebitset_copy_cmp (bitset dst, bitset src)
 {
   if (src == dst)

-    return 0;
+    return false;

 
   if (EBITSET_ZERO_P (dst))
     {
 
   if (EBITSET_ZERO_P (dst))
     {


@@ -491,19 +499,10 @@ ebitset_copy_cmp (bitset dst, bitset src)
     }
 
   if (ebitset_equal_p (dst, src))
     }
 
   if (ebitset_equal_p (dst, src))

-    return 0;
+    return false;

 
   ebitset_copy_ (dst, src);
 
   ebitset_copy_ (dst, src);

-  return 1;
-}
-
-
-/* Return size in bits of bitset SRC.  */
-static bitset_bindex
-ebitset_size (bitset src)
-{
-  /* Return current size of bitset in bits.  */
-  return EBITSET_SIZE (src) * EBITSET_ELT_BITS;
+  return true;

 }
 
 
 }
 
 


@@ -513,7 +512,7 @@ ebitset_set (bitset dst, bitset_bindex bitno)
 {
   bitset_windex windex = bitno / BITSET_WORD_BITS;
 
 {
   bitset_windex windex = bitno / BITSET_WORD_BITS;
 

-  ebitset_elt_find (dst, windex, EBITSET_CREATE);
+  ebitset_elt_find (dst, bitno, EBITSET_CREATE);

 
   dst->b.cdata[windex - dst->b.cindex] |=
     (bitset_word) 1 << (bitno % BITSET_WORD_BITS);
 
   dst->b.cdata[windex - dst->b.cindex] |=
     (bitset_word) 1 << (bitno % BITSET_WORD_BITS);


@@ -526,7 +525,7 @@ ebitset_reset (bitset dst, bitset_bindex bitno)
 {
   bitset_windex windex = bitno / BITSET_WORD_BITS;
 
 {
   bitset_windex windex = bitno / BITSET_WORD_BITS;
 

-  if (!ebitset_elt_find (dst, windex, EBITSET_FIND))
+  if (!ebitset_elt_find (dst, bitno, EBITSET_FIND))

     return;
 
   dst->b.cdata[windex - dst->b.cindex] &=
     return;
 
   dst->b.cdata[windex - dst->b.cindex] &=


@@ -539,16 +538,15 @@ ebitset_reset (bitset dst, bitset_bindex bitno)
 
 
 /* Test bit BITNO in bitset SRC.  */
 
 
 /* Test bit BITNO in bitset SRC.  */

-static int
+static bool

 ebitset_test (bitset src, bitset_bindex bitno)
 {
   bitset_windex windex = bitno / BITSET_WORD_BITS;
 
 ebitset_test (bitset src, bitset_bindex bitno)
 {
   bitset_windex windex = bitno / BITSET_WORD_BITS;
 

-  if (!ebitset_elt_find (src, windex, EBITSET_FIND))
-    return 0;
-
-  return (src->b.
-         cdata[windex - src->b.cindex] >> (bitno % BITSET_WORD_BITS)) & 1;
+  return (ebitset_elt_find (src, bitno, EBITSET_FIND)
+         && ((src->b.cdata[windex - src->b.cindex]
+              >> (bitno % BITSET_WORD_BITS))
+             & 1));

 }
 
 
 }
 
 


@@ -732,6 +730,48 @@ ebitset_list (bitset bset, bitset_bindex *list,
        {
          /* The coast is clear, plant boot!  */
 
        {
          /* The coast is clear, plant boot!  */
 

+#if EBITSET_ELT_WORDS == 2
+         word = srcp[0];
+         if (word)
+           {
+             if (!(word & 0xffff))
+               {
+                 word >>= 16;
+                 bitno += 16;
+               }
+             if (!(word & 0xff))
+               {
+                 word >>= 8;
+                 bitno += 8;
+               }
+             for (; word; bitno++)
+               {
+                 if (word & 1)
+                   list[count++] = bitno;
+                 word >>= 1;
+               }
+           }
+         windex++;
+         bitno = windex * BITSET_WORD_BITS;
+
+         word = srcp[1];
+         if (word)
+           {
+             if (!(word & 0xffff))
+               {
+                 word >>= 16;
+                 bitno += 16;
+               }
+             for (; word; bitno++)
+               {
+                 if (word & 1)
+                   list[count++] = bitno;
+                 word >>= 1;
+               }
+           }
+         windex++;
+         bitno = windex * BITSET_WORD_BITS;
+#else

          for (i = 0; i < EBITSET_ELT_WORDS; i++, windex++)
            {
              bitno = windex * BITSET_WORD_BITS;
          for (i = 0; i < EBITSET_ELT_WORDS; i++, windex++)
            {
              bitno = windex * BITSET_WORD_BITS;


@@ -757,6 +797,7 @@ ebitset_list (bitset bset, bitset_bindex *list,
                    }
                }
            }
                    }
                }
            }

+#endif

        }
       else
        {
        }
       else
        {


@@ -789,29 +830,91 @@ ebitset_list (bitset bset, bitset_bindex *list,
 }
 
 
 }
 
 

+/* Ensure that any unused bits within the last element are clear.  */
+static inline void
+ebitset_unused_clear (bitset dst)
+{
+  unsigned int last_bit;
+  bitset_bindex n_bits;
+
+  n_bits = BITSET_NBITS_ (dst);
+  last_bit = n_bits % EBITSET_ELT_BITS;
+
+  if (last_bit)
+    {
+      bitset_windex eindex;
+      ebitset_elts *elts;
+      ebitset_elt *elt;
+
+      elts = EBITSET_ELTS (dst);
+
+      eindex = n_bits / EBITSET_ELT_BITS;
+
+      elt = elts[eindex];
+      if (elt)
+       {
+         bitset_windex windex;
+         bitset_windex woffset;
+         bitset_word *srcp = EBITSET_WORDS (elt);
+
+         windex = n_bits / BITSET_WORD_BITS;
+         woffset = eindex * EBITSET_ELT_WORDS;
+
+         srcp[windex - woffset] &= ((bitset_word) 1 << last_bit) - 1;
+         windex++;
+         for (; (windex - woffset) < EBITSET_ELT_WORDS; windex++)
+           srcp[windex - woffset] = 0;
+       }
+    }
+}
+
+

 static void
 ebitset_ones (bitset dst)
 {
   bitset_windex j;
   ebitset_elt *elt;
 
 static void
 ebitset_ones (bitset dst)
 {
   bitset_windex j;
   ebitset_elt *elt;
 

-

   for (j = 0; j < EBITSET_SIZE (dst); j++)
     {
       /* Create new elements if they cannot be found.  Perhaps
   for (j = 0; j < EBITSET_SIZE (dst); j++)
     {
       /* Create new elements if they cannot be found.  Perhaps

-        we should just add pointers to a ones element.  */
+        we should just add pointers to a ones element?  */

       elt =
       elt =

-       ebitset_elt_find (dst, j * EBITSET_ELT_WORDS, EBITSET_CREATE);
+       ebitset_elt_find (dst, j * EBITSET_ELT_BITS, EBITSET_CREATE);

       memset (EBITSET_WORDS (elt), -1, sizeof (EBITSET_WORDS (elt)));
     }
   EBITSET_NONZERO_SET (dst);
       memset (EBITSET_WORDS (elt), -1, sizeof (EBITSET_WORDS (elt)));
     }
   EBITSET_NONZERO_SET (dst);

+  ebitset_unused_clear (dst);

 }
 
 
 }
 
 

-static int
+static bool

 ebitset_empty_p (bitset dst)
 {
 ebitset_empty_p (bitset dst)
 {

-  return !ebitset_weed (dst);
+  ebitset_elts *elts;
+  bitset_windex j;
+
+  if (EBITSET_ZERO_P (dst))
+    return 1;
+
+  elts = EBITSET_ELTS (dst);
+  for (j = 0; j < EBITSET_SIZE (dst); j++)
+    {
+      ebitset_elt *elt = elts[j];
+
+      if (elt)
+       {
+         if (!ebitset_elt_zero_p (elt))
+           return 0;
+         /* Do some weeding as we go.  */
+         ebitset_elt_remove (dst, j);
+       }
+    }
+
+  /* All the bits are zero.  We could shrink the elts.
+     For now just mark DST as known to be zero.  */
+  EBITSET_ZERO_SET (dst);
+  return 1;

 }
 
 
 }
 
 


@@ -823,24 +926,27 @@ ebitset_not (bitset dst, bitset src)
   ebitset_elt *delt;
   bitset_windex j;
 
   ebitset_elt *delt;
   bitset_windex j;
 

+  ebitset_resize (dst, BITSET_NBITS_ (src));
+

   for (j = 0; j < EBITSET_SIZE (src); j++)
     {
       /* Create new elements for dst if they cannot be found
   for (j = 0; j < EBITSET_SIZE (src); j++)
     {
       /* Create new elements for dst if they cannot be found

-            or substitute zero elements if src elements not found.  */
+        or substitute zero elements if src elements not found.  */

       selt =
       selt =

-       ebitset_elt_find (dst, j * EBITSET_ELT_WORDS, EBITSET_SUBST);
+       ebitset_elt_find (dst, j * EBITSET_ELT_BITS, EBITSET_SUBST);

       delt =
       delt =

-       ebitset_elt_find (dst, j * EBITSET_ELT_WORDS, EBITSET_CREATE);
+       ebitset_elt_find (dst, j * EBITSET_ELT_BITS, EBITSET_CREATE);

 
       for (i = 0; i < EBITSET_ELT_WORDS; i++)
        EBITSET_WORDS (delt)[i] = ~EBITSET_WORDS (selt)[i];
     }
   EBITSET_NONZERO_SET (dst);
 
       for (i = 0; i < EBITSET_ELT_WORDS; i++)
        EBITSET_WORDS (delt)[i] = ~EBITSET_WORDS (selt)[i];
     }
   EBITSET_NONZERO_SET (dst);

+  ebitset_unused_clear (dst);

 }
 
 
 }
 
 

-/* Return 1 if DST == DST | SRC.  */
-static int
+/* Is DST == DST | SRC?  */
+static bool

 ebitset_subset_p (bitset dst, bitset src)
 {
   bitset_windex j;
 ebitset_subset_p (bitset dst, bitset src)
 {
   bitset_windex j;


@@ -875,14 +981,14 @@ ebitset_subset_p (bitset dst, bitset src)
       for (i = 0; i < EBITSET_ELT_WORDS; i++)
        if (EBITSET_WORDS (delt)[i]
            != (EBITSET_WORDS (selt)[i] | EBITSET_WORDS (delt)[i]))
       for (i = 0; i < EBITSET_ELT_WORDS; i++)
        if (EBITSET_WORDS (delt)[i]
            != (EBITSET_WORDS (selt)[i] | EBITSET_WORDS (delt)[i]))

-         return 0;
+         return false;

     }
     }

-  return 1;
+  return true;

 }
 
 
 }
 
 

-/* Return 1 if DST & SRC == 0.  */
-static int
+/* Is DST & SRC == 0?  */
+static bool

 ebitset_disjoint_p (bitset dst, bitset src)
 {
   bitset_windex j;
 ebitset_disjoint_p (bitset dst, bitset src)
 {
   bitset_windex j;


@@ -911,14 +1017,14 @@ ebitset_disjoint_p (bitset dst, bitset src)
 
       for (i = 0; i < EBITSET_ELT_WORDS; i++)
        if ((EBITSET_WORDS (selt)[i] & EBITSET_WORDS (delt)[i]))
 
       for (i = 0; i < EBITSET_ELT_WORDS; i++)
        if ((EBITSET_WORDS (selt)[i] & EBITSET_WORDS (delt)[i]))

-         return 0;
+         return false;

     }
     }

-  return 1;
+  return true;

 }
 
 
 
 }
 
 
 

-static int
+static bool

 ebitset_op3_cmp (bitset dst, bitset src1, bitset src2, enum bitset_ops op)
 {
   bitset_windex ssize1;
 ebitset_op3_cmp (bitset dst, bitset src1, bitset src2, enum bitset_ops op)
 {
   bitset_windex ssize1;


@@ -931,10 +1037,12 @@ ebitset_op3_cmp (bitset dst, bitset src1, bitset src2, enum bitset_ops op)
   bitset_word *srcp1;
   bitset_word *srcp2;
   bitset_word *dstp;
   bitset_word *srcp1;
   bitset_word *srcp2;
   bitset_word *dstp;

-  int changed = 0;
+  bool changed = false;

   unsigned int i;
   bitset_windex j;
 
   unsigned int i;
   bitset_windex j;
 

+  ebitset_resize (dst, max (BITSET_NBITS_ (src1), BITSET_NBITS_ (src2)));
+

   ssize1 = EBITSET_SIZE (src1);
   ssize2 = EBITSET_SIZE (src2);
   dsize = EBITSET_SIZE (dst);
   ssize1 = EBITSET_SIZE (src1);
   ssize2 = EBITSET_SIZE (src2);
   dsize = EBITSET_SIZE (dst);


@@ -942,9 +1050,6 @@ ebitset_op3_cmp (bitset dst, bitset src1, bitset src2, enum bitset_ops op)
   if (size < ssize2)
     size = ssize2;
 
   if (size < ssize2)
     size = ssize2;
 

-  if (size > dsize)
-    ebitset_elts_grow (dst, size - dsize);
-

   selts1 = EBITSET_ELTS (src1);
   selts2 = EBITSET_ELTS (src2);
   delts = EBITSET_ELTS (dst);
   selts1 = EBITSET_ELTS (src1);
   selts2 = EBITSET_ELTS (src2);
   delts = EBITSET_ELTS (dst);


@@ -963,7 +1068,7 @@ ebitset_op3_cmp (bitset dst, bitset src1, bitset src2, enum bitset_ops op)
        {
          if (delt)
            {
        {
          if (delt)
            {

-             changed = 1;
+             changed = true;

              ebitset_elt_remove (dst, j);
            }
          continue;
              ebitset_elt_remove (dst, j);
            }
          continue;


@@ -983,6 +1088,9 @@ ebitset_op3_cmp (bitset dst, bitset src1, bitset src2, enum bitset_ops op)
       dstp = EBITSET_WORDS (delt);
       switch (op)
        {
       dstp = EBITSET_WORDS (delt);
       switch (op)
        {

+       default:
+         abort ();
+

        case BITSET_OP_OR:
          for (i = 0; i < EBITSET_ELT_WORDS; i++, dstp++)
            {
        case BITSET_OP_OR:
          for (i = 0; i < EBITSET_ELT_WORDS; i++, dstp++)
            {


@@ -990,7 +1098,7 @@ ebitset_op3_cmp (bitset dst, bitset src1, bitset src2, enum bitset_ops op)
 
              if (*dstp != tmp)
                {
 
              if (*dstp != tmp)
                {

-                 changed = 1;
+                 changed = true;

                  *dstp = tmp;
                }
            }
                  *dstp = tmp;
                }
            }


@@ -1003,7 +1111,7 @@ ebitset_op3_cmp (bitset dst, bitset src1, bitset src2, enum bitset_ops op)
 
              if (*dstp != tmp)
                {
 
              if (*dstp != tmp)
                {

-                 changed = 1;
+                 changed = true;

                  *dstp = tmp;
                }
            }
                  *dstp = tmp;
                }
            }


@@ -1016,7 +1124,7 @@ ebitset_op3_cmp (bitset dst, bitset src1, bitset src2, enum bitset_ops op)
 
              if (*dstp != tmp)
                {
 
              if (*dstp != tmp)
                {

-                 changed = 1;
+                 changed = true;

                  *dstp = tmp;
                }
            }
                  *dstp = tmp;
                }
            }


@@ -1029,14 +1137,11 @@ ebitset_op3_cmp (bitset dst, bitset src1, bitset src2, enum bitset_ops op)
 
              if (*dstp != tmp)
                {
 
              if (*dstp != tmp)
                {

-                 changed = 1;
+                 changed = true;

                  *dstp = tmp;
                }
            }
          break;
                  *dstp = tmp;
                }
            }
          break;

-
-       default:
-         abort ();

        }
 
       if (!ebitset_elt_zero_p (delt))
        }
 
       if (!ebitset_elt_zero_p (delt))


@@ -1054,7 +1159,7 @@ ebitset_op3_cmp (bitset dst, bitset src1, bitset src2, enum bitset_ops op)
     {
       ebitset_elt *delt;
 
     {
       ebitset_elt *delt;
 

-      changed = 1;
+      changed = true;

 
       delt = delts[j];
 
 
       delt = delts[j];
 


@@ -1067,10 +1172,10 @@ ebitset_op3_cmp (bitset dst, bitset src1, bitset src2, enum bitset_ops op)
 }
 
 
 }
 
 

-static int
+static bool

 ebitset_and_cmp (bitset dst, bitset src1, bitset src2)
 {
 ebitset_and_cmp (bitset dst, bitset src1, bitset src2)
 {

-  int changed;
+  bool changed;

 
   if (EBITSET_ZERO_P (src2))
     {
 
   if (EBITSET_ZERO_P (src2))
     {


@@ -1097,10 +1202,10 @@ ebitset_and (bitset dst, bitset src1, bitset src2)
 }
 
 
 }
 
 

-static int
+static bool

 ebitset_andn_cmp (bitset dst, bitset src1, bitset src2)
 {
 ebitset_andn_cmp (bitset dst, bitset src1, bitset src2)
 {

-  int changed;
+  bool changed;

 
   if (EBITSET_ZERO_P (src2))
     {
 
   if (EBITSET_ZERO_P (src2))
     {


@@ -1124,7 +1229,7 @@ ebitset_andn (bitset dst, bitset src1, bitset src2)
 }
 
 
 }
 
 

-static int
+static bool

 ebitset_or_cmp (bitset dst, bitset src1, bitset src2)
 {
   if (EBITSET_ZERO_P (src2))
 ebitset_or_cmp (bitset dst, bitset src1, bitset src2)
 {
   if (EBITSET_ZERO_P (src2))


@@ -1146,7 +1251,7 @@ ebitset_or (bitset dst, bitset src1, bitset src2)
 }
 
 
 }
 
 

-static int
+static bool

 ebitset_xor_cmp (bitset dst, bitset src1, bitset src2)
 {
   if (EBITSET_ZERO_P (src2))
 ebitset_xor_cmp (bitset dst, bitset src1, bitset src2)
 {
   if (EBITSET_ZERO_P (src2))


@@ -1184,7 +1289,8 @@ struct bitset_vtable ebitset_vtable = {
   ebitset_reset,
   bitset_toggle_,
   ebitset_test,
   ebitset_reset,
   bitset_toggle_,
   ebitset_test,

-  ebitset_size,
+  ebitset_resize,
+  bitset_size_,

   bitset_count_,
   ebitset_empty_p,
   ebitset_ones,
   bitset_count_,
   ebitset_empty_p,
   ebitset_ones,


@@ -1239,9 +1345,9 @@ ebitset_init (bitset bset, bitset_bindex n_bits)
   size = n_bits ? (n_bits + EBITSET_ELT_BITS - 1) / EBITSET_ELT_BITS
     : EBITSET_INITIAL_SIZE;
 
   size = n_bits ? (n_bits + EBITSET_ELT_BITS - 1) / EBITSET_ELT_BITS
     : EBITSET_INITIAL_SIZE;
 

-  EBITSET_SIZE (bset) = 0;
+  EBITSET_ASIZE (bset) = 0;

   EBITSET_ELTS (bset) = 0;
   EBITSET_ELTS (bset) = 0;

-  ebitset_elts_grow (bset, size);
+  ebitset_resize (bset, n_bits);

 
   return bset;
 }
 
   return bset;
 }


@@ -1253,7 +1359,7 @@ ebitset_release_memory (void)
   ebitset_free_list = 0;
   if (ebitset_obstack_init)
     {
   ebitset_free_list = 0;
   if (ebitset_obstack_init)
     {

-      ebitset_obstack_init = 0;
+      ebitset_obstack_init = false;

       obstack_free (&ebitset_obstack, NULL);
     }
 }
       obstack_free (&ebitset_obstack, NULL);
     }
 }