X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/7086e7071e8bfa2012e9134530a158c88a832ba6..d32fe6f64fa02da99855083889017458a7d9c2ff:/lib/bitset.c

diff --git a/lib/bitset.c b/lib/bitset.c
index c68ed788..087a6b63 100644
--- a/lib/bitset.c
+++ b/lib/bitset.c
@@ -2,19 +2,19 @@
    Copyright (C) 2002 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 2 of the License, or
-(at your option) any later version.
+   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
+   (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.
+   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, write to the Free Software
-Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+   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.  */
 
 #ifdef HAVE_CONFIG_H
 #include "config.h"
@@ -22,134 +22,33 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
 
 #include <stdlib.h>
 #include "bitset.h"
+#include "abitset.h"
+#include "lbitset.h"
+#include "ebitset.h"
+#include "bitset_stats.h"
 #include "obstack.h"
 
-static void bitset_print PARAMS ((FILE *, bitset, int));
-
-#if BITSET_CHECK
-#define BITSET__CHECK2(DST, SRC) \
-if ((DST)->OPS != (SRC)->OPS) abort ();
-
-#define BITSET__CHECK3(DST, SRC1, SRC2) \
-if ((DST)->OPS != (SRC1)->OPS || (DST)->OPS != (SRC2)->OPS) abort ();
-
-#define BITSET__CHECK4(DST, SRC1, SRC2) \
-if ((DST)->OPS != (SRC1)->OPS || (DST)->OPS != (SRC2)->OPS \
-    || (DST)->OPS != (SRC3)->OPS) abort ();
-#else
-#define BITSET__CHECK2(DST, SRC)
-
-#define BITSET__CHECK3(DST, SRC1, SRC2)
-
-#define BITSET__CHECK4(DST, SRC1, SRC2, SRC3)
-#endif
-
-#if BITSET_STATS
-#define BITSET_STATS_FILE "bitset.dat"
-
-#define BITSET_LOG_COUNT_BINS 10
-#define BITSET_LOG_SIZE_BINS  16
-#define BITSET_DENSITY_BINS  20
-
-struct bitset_type_stats_struct
-{
-  unsigned int xmallocs;
-  unsigned int xfrees;
-  unsigned int oballocs;
-  unsigned int obfrees;
-  unsigned int lists;
-  unsigned int list_counts[BITSET_LOG_COUNT_BINS];
-  unsigned int list_sizes[BITSET_LOG_SIZE_BINS];
-  unsigned int list_density[BITSET_DENSITY_BINS];
-};
-
-struct bitset_stats_struct
-{
-    unsigned int runs;
-    struct bitset_type_stats_struct types[BITSET_TYPE_NUM];
-};
-
-struct bitset_stats_struct bitset_stats_data;
-struct bitset_stats_struct *bitset_stats;
-
-static void bitset_percent_histogram_print PARAMS ((FILE *, const char *,
-						    const char *,
-						    unsigned int,
-						    unsigned int *));
-static void bitset_log_histogram_print PARAMS ((FILE *, const char *,
-						const char *,
-						unsigned int, unsigned int *));
-static void bitset_stats_print_1 PARAMS ((FILE *, const char *,
-					  struct bitset_type_stats_struct *));
-static void bitset_stats_print PARAMS ((FILE *, int));
-static void bitset_stats_read PARAMS ((void));
-static void bitset_stats_write PARAMS ((void));
-
-#define BITSET_STATS_XMALLOCS_INC(TYPE) 		\
-  if (bitset_stats)					\
-    bitset_stats->types[(TYPE)].xmallocs++
-
-#define BITSET_STATS_XFREES_INC(BSET) 			\
-  if (bitset_stats)					\
-    bitset_stats->types[(BSET)->ops->type].xfrees++
-
-#define BITSET_STATS_OBALLOCS_INC(TYPE) 		\
-  if (bitset_stats)					\
-    bitset_stats->types[(TYPE)].oballocs++
-
-#define BITSET_STATS_OBFREES_INC(BSET) 		\
-  if (bitset_stats)					\
-    bitset_stats->types[(BSET)->ops->type].obfrees++
-
-#define BITSET_STATS_LISTS_INC(BSET) 			\
-  if (bitset_stats)					\
-    bitset_stats->types[(BSET)->ops->type].lists++
-
-#define BITSET_STATS_LIST_COUNTS_INC(BSET, I) 		\
-  if (bitset_stats)					\
-    bitset_stats->types[(BSET)->ops->type].list_counts[(I)]++
-
-#define BITSET_STATS_LIST_SIZES_INC(BSET, I) 		\
-  if (bitset_stats)					\
-    bitset_stats->types[(BSET)->ops->type].list_sizes[(I)]++
-
-#define BITSET_STATS_LIST_DENSITY_INC(BSET, I) 		\
-  if (bitset_stats)					\
-    bitset_stats->types[(BSET)->ops->type].list_density[(I)]++
-
-#else
-#define BITSET_STATS_XMALLOCS_INC(TYPE)
-
-#define BITSET_STATS_XFREES_INC(BSET)
-
-#define BITSET_STATS_OBALLOCS_INC(TYPE)
-
-#define BITSET_STATS_OBFREES_INC(BSET)
-
-#define BITSET_STATS_LISTS_INC(BSET)
-
-#define BITSET_STATS_LIST_COUNTS_INC(BSET, I)
-
-#define BITSET_STATS_LIST_SIZES_INC(BSET, I)
-
-#define BITSET_STATS_LIST_DENSITY_INC(BSET, I)
-#endif /* BITSET_STATS  */
+const char * const bitset_type_names[] = BITSET_TYPE_NAMES;
 
+static void bitset_print PARAMS ((FILE *, bitset, int));
 
 
 /* Return number of bytes required to create a N_BIT bitset
    of TYPE.  The bitset may grow to require more bytes than this.  */
-int
+size_t
 bitset_bytes (type, n_bits)
      enum bitset_type type;
      bitset_bindex n_bits;
 {
-  unsigned int bytes;
+  size_t bytes;
+
+  if (bitset_stats_enabled)
+    return bitset_stats_bytes ();
 
   switch (type)
     {
     case BITSET_ARRAY:
-      bytes = sbitset_bytes (n_bits);
+      bytes = abitset_bytes (n_bits);
       break;
 
     case BITSET_LIST:
@@ -175,10 +74,13 @@ bitset_init (bset, n_bits, type)
      bitset_bindex n_bits;
      enum bitset_type type;
 {
+  if (bitset_stats_enabled)
+    return bitset_stats_init (bset, n_bits, type);
+  
   switch (type)
     {
     case BITSET_ARRAY:
-      return sbitset_init (bset, n_bits);
+      return abitset_init (bset, n_bits);
 
     case BITSET_LIST:
       return lbitset_init (bset, n_bits);
@@ -202,18 +104,14 @@ bitset_type_choose (n_bits, attr)
 {
   enum bitset_type type;
 
-#ifdef ENABLE_CHECKING
   /* Check attributes.  */
   if (attr & BITSET_FIXED && attr & BITSET_VARIABLE)
     abort ();
   if (attr & BITSET_SPARSE && attr & BITSET_DENSE)
     abort ();
 
-  /* Note that sometimes we will be asked for a zero length
-     fixed size bitset.  */
-#endif
-
-  /* Choose the type of bitset.  */
+  /* Choose the type of bitset. Note that sometimes we will be asked
+  for a zero length fixed size bitset.  */
 
   type = BITSET_ARRAY;
   /* Currently, the simple bitsets do not support a variable size.  */
@@ -234,14 +132,16 @@ bitset_alloc (n_bits, type)
      bitset_bindex n_bits;
      enum bitset_type type;
 {
-  unsigned int bytes;
+  size_t bytes;
   bitset bset;
 
-  BITSET_STATS_XMALLOCS_INC (type);
-
   bytes = bitset_bytes (type, n_bits);
 
-  bset = (bitset) xmalloc (bytes);
+  bset = (bitset) xcalloc (1, bytes);
+
+  /* The cache is disabled until some elements are allocated.  If we
+     have variable length arrays, then we may need to allocate a dummy
+     element.  */
 
   return bitset_init (bset, n_bits, type);
 }
@@ -250,17 +150,19 @@ bitset_alloc (n_bits, type)
 /* Create a bitset of N_BITS of type TYPE.  */
 bitset
 bitset_obstack_alloc (bobstack, n_bits, type)
-    struct obstack *bobstack;
-    bitset_bindex n_bits;
-    enum bitset_type type;
+     struct obstack *bobstack;
+     bitset_bindex n_bits;
+     enum bitset_type type;
 {
-  unsigned int bytes;
-
-  BITSET_STATS_OBALLOCS_INC (type);
+  size_t bytes;
+  bitset bset;
 
   bytes = bitset_bytes (type, n_bits);
 
-  return bitset_init (obstack_alloc (bobstack, bytes), n_bits, type);
+  bset = obstack_alloc (bobstack, bytes);
+  memset (bset, 0, bytes);
+
+  return bitset_init (bset, n_bits, type);
 }
 
 
@@ -284,12 +186,7 @@ void
 bitset_free (bset)
      bitset bset;
 {
-  BITSET_STATS_XFREES_INC (bset);
-
-  if (bset->ops->free)
-    BITSET__FREE (bset);
-
-  bset->ops = NULL;
+  BITSET_FREE_ (bset);
   free (bset);
 }
 
@@ -299,17 +196,41 @@ void
 bitset_obstack_free (bset)
      bitset bset;
 {
-  BITSET_STATS_OBFREES_INC (bset);
+  BITSET_FREE_ (bset);
+}
 
-  if (bset->ops->free)
-    BITSET__FREE (bset);
-  bset->ops = NULL;
+
+/* Return bitset type.  */
+enum bitset_type
+bitset_type_get (bset)
+   bitset bset;
+{
+   enum bitset_type type;
+
+   type = BITSET_TYPE_ (bset);
+   if (type != BITSET_STATS)
+      return type;
+   
+   return bitset_stats_type_get (bset);
+}
+
+
+/* Return name of bitset type.  */
+const char *
+bitset_type_name_get (bset)
+     bitset bset;
+{
+  enum bitset_type type;
+
+  type = bitset_type_get (bset);
+
+  return bitset_type_names[type];
 }
 
 
 /* Find next bit set in SRC starting from and including BITNO.
-   Return -1 if SRC empty.  */
-int
+   Return BITSET_BINDEX_MAX if SRC empty.  */
+bitset_bindex
 bitset_next (src, bitno)
      bitset src;
      bitset_bindex bitno;
@@ -318,14 +239,14 @@ bitset_next (src, bitno)
   bitset_bindex next = bitno;
 
   if (!bitset_list (src, &val, 1, &next))
-    return -1;
+    return BITSET_BINDEX_MAX;
   return val;
 }
 
 
 /* Find previous bit set in SRC starting from and including BITNO.
-   Return -1 if SRC empty.  */
-int
+   Return BITSET_BINDEX_MAX if SRC empty.  */
+bitset_bindex
 bitset_prev (src, bitno)
      bitset src;
      bitset_bindex bitno;
@@ -333,14 +254,14 @@ bitset_prev (src, bitno)
   bitset_bindex val;
   bitset_bindex next = bitno;
 
-  if (!bitset_reverse_list (src, &val, 1, &next))
-    return -1;
+  if (!bitset_list_reverse (src, &val, 1, &next))
+    return BITSET_BINDEX_MAX;
   return val;
 }
 
 
 /* Find first set bit.   */
-int
+bitset_bindex
 bitset_first (src)
      bitset src;
 {
@@ -349,7 +270,7 @@ bitset_first (src)
 
 
 /* Find last set bit.   */
-int
+bitset_bindex
 bitset_last (src)
      bitset src;
 {
@@ -357,19 +278,38 @@ bitset_last (src)
 }
 
 
+/* Return non-zero if BITNO in SRC is the only set bit.  */
+int
+bitset_only_set_p (src, bitno)
+     bitset src;
+     bitset_bindex bitno;
+{
+  bitset_bindex val[2];
+  bitset_bindex next = 0;
+
+  if (bitset_list (src, val, 2, &next) != 1)
+    return 0;
+  return val[0] == bitno;
+}
+
+
+/* Print contents of bitset BSET to FILE.   */
 static void
 bitset_print (file, bset, verbose)
      FILE *file;
      bitset bset;
      int verbose;
 {
-  unsigned int i, pos;
+  unsigned int pos;
+  bitset_bindex i;
+  bitset_iterator iter;
 
   if (verbose)
-    fprintf (file, "n_bits = %d, set = {", bitset_size (bset));
+    fprintf (file, "n_bits = %lu, set = {",
+	     (unsigned long) bitset_size (bset));
 
   pos = 30;
-  BITSET_EXECUTE (bset, 0, i,
+  BITSET_FOR_EACH (iter, bset, i, 0)
   {
     if (pos > 70)
       {
@@ -379,191 +319,13 @@ bitset_print (file, bset, verbose)
 
     fprintf (file, "%d ", i);
     pos += 1 + (i >= 10) + (i >= 100);
-  });
+  };
 
   if (verbose)
     fprintf (file, "}\n");
 }
 
 
-int
-bitset_copy (dst, src)
-    bitset dst;
-    bitset src;
-{
-    unsigned int i;
-
-    if (dst->ops == src->ops)
-	return BITSET__COPY (dst, src);
-
-    /* Convert bitset types.  We assume that the DST bitset
-       is large enough to hold the SRC bitset.  */
-    bitset_zero (dst);
-    BITSET_EXECUTE (src, 0, i,
-     {
-       bitset_set (dst, i);
-     });
-
-    return 1;
-}
-
-
-/* Return size in bits of bitset SRC.  */
-int
-bitset_size (src)
-    bitset src;
-{
-    return BITSET__SIZE (src);
-}
-
-
-/* DST = 0.  */
-int
-bitset_zero (dst)
-    bitset dst;
-{
-    return BITSET__OP1 (dst, BITSET_ZERO);
-}
-
-
-/* DST = ~0.  */
-int
-bitset_ones (dst)
-    bitset dst;
-{
-    return BITSET__OP1 (dst, BITSET_ONES);
-}
-
-
-/* Return non-zero if all bits in bitset SRC are reset.  */
-int
-bitset_empty_p (src)
-    bitset src;
-{
-    return BITSET__OP1 (src, BITSET_EMPTY_P);
-}
-
-
-/* Return DST == DST | SRC.  */
-int
-bitset_subset_p (dst, src)
-    bitset dst;
-    bitset src;
-{
-    return BITSET__OP2 (dst, src, BITSET_SUBSET_P);
-}
-
-
-/* Return DST == SRC.  */
-int
-bitset_equal_p (dst, src)
-    bitset dst;
-    bitset src;
-{
-    BITSET__CHECK2 (dst, src);
-    return BITSET__OP2 (dst, src, BITSET_EQUAL_P);
-}
-
-
-/* DST = ~SRC.  */
-int
-bitset_not (dst, src)
-    bitset dst;
-    bitset src;
-{
-    BITSET__CHECK2 (dst, src);
-    return BITSET__OP2 (dst, src, BITSET_NOT);
-}
-
-
-/* DST = SRC1 | SRC2.  Return non-zero if DST != SRC1 | SRC2.  */
-int
-bitset_or (dst, src1, src2)
-    bitset dst;
-    bitset src1;
-    bitset src2;
-{
-    BITSET__CHECK3 (dst, src1, src2);
-    return BITSET__OP3 (dst, src1, src2, BITSET_OR);
-}
-
-
-/* DST = SRC1 & SRC2.  Return non-zero if DST != SRC1 & SRC2.  */
-int
-bitset_and (dst, src1, src2)
-    bitset dst;
-    bitset src1;
-    bitset src2;
-{
-    BITSET__CHECK3 (dst, src1, src2);
-    return BITSET__OP3 (dst, src1, src2, BITSET_AND);
-}
-
-
-/* DST = SRC1 ^ SRC2.  Return non-zero if DST != SRC1 ^ SRC2.  */
-int
-bitset_xor (dst, src1, src2)
-    bitset dst;
-    bitset src1;
-    bitset src2;
-{
-    BITSET__CHECK3 (dst, src1, src2);
-    return BITSET__OP3 (dst, src1, src2, BITSET_XOR);
-}
-
-
-/* DST = SRC1 & ~SRC2.  Return non-zero if DST != SRC1 & ~SRC2.  */
-int
-bitset_andn (dst, src1, src2)
-    bitset dst;
-    bitset src1;
-    bitset src2;
-{
-    BITSET__CHECK3 (dst, src1, src2);
-    return BITSET__OP3 (dst, src1, src2, BITSET_ANDN);
-}
-
-
-/* DST = SRC1 | ~SRC2.  Return non-zero if DST != SRC1 | ~SRC2.  */
-int
-bitset_orn (dst, src1, src2)
-    bitset dst;
-    bitset src1;
-    bitset src2;
-{
-    BITSET__CHECK3 (dst, src1, src2);
-    return BITSET__OP3 (dst, src1, src2, BITSET_ORN);
-}
-
-
-/* DST = (SRC1 | SRC2) & SRC3.  Return non-zero if
-   DST != (SRC1 | SRC2) & SRC3.  */
-int
-bitset_or_and (dst, src1, src2, src3)
-    bitset dst;
-    bitset src1;
-    bitset src2;
-    bitset src3;
-{
-    BITSET__CHECK4 (dst, src1, src2, src3);
-    return BITSET__OP4 (dst, src1, src2, src3, BITSET_OR_AND);
-}
-
-
-/* DST = (SRC1 & SRC2) | SRC3.  Return non-zero if
-   DST != (SRC1 & SRC2) | SRC3.  */
-int
-bitset_and_or (dst, src1, src2, src3)
-    bitset dst;
-    bitset src1;
-    bitset src2;
-    bitset src3;
-{
-    BITSET__CHECK4 (dst, src1, src2, src3);
-    return BITSET__OP4 (dst, src1, src2, src3, BITSET_AND_OR);
-}
-
-
 /* Dump bitset BSET to FILE.  */
 void
 bitset_dump (file, bset)
@@ -574,14 +336,6 @@ bitset_dump (file, bset)
 }
 
 
-/* Function to be called from debugger to print bitset.  */
-void
-debug_bitset (bset)
-     bitset bset;
-{
-  bitset_print (stderr, bset, 1);
-}
-
 
 /* Release memory associated with bitsets.  */
 void
@@ -592,244 +346,164 @@ bitset_release_memory ()
 }
 
 
-#if BITSET_STATS
+
+/* Toggle bit BITNO in bitset BSET and return non-zero if not set.  */
 int
-bitset_list (bset, list, num, next)
+bitset_toggle_ (bset, bitno)
     bitset bset;
-    bitset_bindex *list;
-    bitset_bindex num;
-    bitset_bindex *next;
+    bitset_bindex bitno;
 {
-    bitset_bindex count;
-
-    count = BITSET__LIST (bset, list, num, next);
-
-    if (bitset_stats)
-      {
-	bitset_bindex tmp;
-	bitset_bindex size;
-	bitset_bindex i;
-	enum bitset_type type;
-
-	type = bset->ops->type;
-	BITSET_STATS_LISTS_INC (bset);
-
-	/* Log histogram of number of set bits.  */
-	for (i = 0, tmp = count; tmp; tmp >>= 1, i++)
-	  continue;
-	if (i >= BITSET_LOG_COUNT_BINS)
-	  i = BITSET_LOG_COUNT_BINS - 1;
-	BITSET_STATS_LIST_COUNTS_INC (bset, i);
-
-	/* Log histogram of number of bits in set.  */
-	size = bitset_size (bset);
-	for (i = 0, tmp = size; tmp; tmp >>= 1, i++)
-	  continue;
-	if (i >= BITSET_LOG_SIZE_BINS)
-	  i = BITSET_LOG_SIZE_BINS - 1;
-	BITSET_STATS_LIST_SIZES_INC (bset, i);
-
-	/* Histogram of fraction of bits set.  */
-	i = size ? (count * BITSET_DENSITY_BINS) / size : 0;
-	if (i >= BITSET_DENSITY_BINS)
-	  i = BITSET_DENSITY_BINS - 1;
-	BITSET_STATS_LIST_DENSITY_INC (bset, i);
-      }
-    return count;
+  /* This routine is for completeness.  It could be optimized if
+     required.  */
+  if (bitset_test (bset, bitno))
+    {
+      bitset_reset (bset, bitno);
+      return 0;
+    }
+  else
+    {
+      bitset_set (bset, bitno);
+      return 1;
+    }
 }
 
 
-/* Print a percentage histogram with message MSG to FILE.  */
-static void
-bitset_percent_histogram_print (file, name, msg, n_bins, bins)
-     FILE *file;
-     const char *name;
-     const char *msg;
-     unsigned int n_bins;
-     unsigned int *bins;
+/* Return number of bits set in bitset SRC.  */
+bitset_bindex
+bitset_count_ (src)
+     bitset src;
 {
-  unsigned int i;
-  unsigned int total;
-
-  total = 0;
-  for (i = 0; i < n_bins; i++)
-    total += bins[i];
-
-  if (!total)
-      return;
-
-  fprintf (file, "%s %s", name, msg);
-  for (i = 0; i < n_bins; i++)
-    fprintf (file, "%.0f-%.0f%%\t%8d (%5.1f%%)\n",
-	     i * 100.0 / n_bins,
-	     (i + 1) * 100.0 / n_bins,
-	     bins[i], (100.0 * bins[i]) / total);
-}
-
+  bitset_bindex list[BITSET_LIST_SIZE];
+  bitset_bindex next;
+  bitset_bindex num;
+  bitset_bindex count;
+  
+  /* This could be greatly sped up by adding a count method for each
+     bitset implementation that uses a direct technique (based on
+     masks) for counting the number of bits set in a word.  */
 
-/* Print a log histogram with message MSG to FILE.  */
-static void
-bitset_log_histogram_print (file, name, msg, n_bins, bins)
-     FILE *file;
-     const char *name;
-     const char *msg;
-     unsigned int n_bins;
-     unsigned int *bins;
-{
-  unsigned int i;
-  unsigned int total;
-  unsigned int max_width;
-
-  total = 0;
-  for (i = 0; i < n_bins; i++)
-    total += bins[i];
-
-  if (!total)
-      return;
-
-  /* 2 * ceil (log10(2) * (N - 1)) + 1  */
-  max_width = 2 * (unsigned int)(0.30103 * (n_bins - 1) + 0.9999) + 1;
-
-  fprintf (file, "%s %s", name, msg);
-  for (i = 0; i < 2; i++)
-    fprintf (file, "%*d\t%8d (%5.1f%%)\n",
-	     max_width, i, bins[i], 100.0 * bins[i] / total);
-
-  /* Perhaps we should bail out once the histogram goes to zero.  */
-  for (; i < n_bins; i++)
-    fprintf (file, "%*d-%d\t%8d (%5.1f%%)\n",
-	     max_width - ((unsigned int) (0.30103 * (i) + 0.9999) + 1),
-	     1 << (i - 1), (1 << i) - 1, bins[i], (100.0 * bins[i]) / total);
+  next = 0;
+  for (count = 0; (num = bitset_list (src, list, BITSET_LIST_SIZE, &next));
+       count += num)
+    continue;
+  
+  return count;
 }
 
 
-/* Print bitset statistics to FILE.  */
-static void
-bitset_stats_print_1 (file, name, stats)
-     FILE *file;
-     const char *name;
-     struct bitset_type_stats_struct *stats;
+/* DST = SRC.  Return non-zero if DST != SRC. 
+   This is a fallback for the case where SRC and DST are different
+   bitset types.  */
+int
+bitset_copy_ (dst, src)
+     bitset dst;
+     bitset src;
 {
-  if (!stats)
-    return;
-
-  fprintf (file, "%d %ss xmalloced, %d freed.\n",
-	   stats->xmallocs, name, stats->xfrees);
-  fprintf (file, "%d %ss oballoced, %d freed.\n",
-	   stats->oballocs, name, stats->obfrees);
-
-  fprintf (file, "%d bitset_lists\n", stats->lists);
+  bitset_bindex i;
+  bitset_iterator iter;
 
-  bitset_log_histogram_print (file, name, "count log histogram\n",
-	   BITSET_LOG_COUNT_BINS, stats->list_counts);
-
-  bitset_log_histogram_print (file, name, "size log histogram\n",
-	   BITSET_LOG_SIZE_BINS, stats->list_sizes);
+  /* Convert bitset types.  We assume that the DST bitset
+     is large enough to hold the SRC bitset.  */
+  bitset_zero (dst);
+  BITSET_FOR_EACH (iter, src, i, 0)
+  {
+     bitset_set (dst, i);
+  };
 
-  bitset_percent_histogram_print (file, name, "density histogram\n",
-				  BITSET_DENSITY_BINS, stats->list_density);
+  return 1;
 }
 
 
-/* Print all bitset statistics to FILE.  */
-static void
-bitset_stats_print (file, verbose)
-     FILE *file;
-     int verbose ATTRIBUTE_UNUSED;
+/* This is a fallback for implementations that do not support
+   four operand operations.  */
+static inline int
+bitset_op4_cmp (dst, src1, src2, src3, op)
+     bitset dst;
+     bitset src1;
+     bitset src2;
+     bitset src3;
+     enum bitset_ops op;
 {
-  int i;
-  static const char *names[] = BITSET__TYPE_NAMES;
+  int changed = 0;
+  int stats_enabled_save;
+  bitset tmp;
 
-  if (!bitset_stats)
-    return;
+  /* Create temporary bitset.  */
+  stats_enabled_save = bitset_stats_enabled;
+  bitset_stats_enabled = 0;
+  tmp = bitset_alloc (0, bitset_type_get (dst));
+  bitset_stats_enabled = stats_enabled_save;
 
-  fprintf (file, "Bitset statistics:\n\n");
+  switch (op)
+    {
+    case BITSET_OP_OR_AND:
+      bitset_or (tmp, src1, src2);
+      changed = bitset_and_cmp (dst, src3, tmp);
+      break;
 
-  if (bitset_stats->runs > 1)
-    fprintf (file, "Accumulated runs = %d\n", bitset_stats->runs);
+    case BITSET_OP_AND_OR:
+      bitset_and (tmp, src1, src2);
+      changed = bitset_or_cmp (dst, src3, tmp);
+      break;
 
-  for (i = 0; i < BITSET_TYPE_NUM; i++)
-      bitset_stats_print_1 (file, names[i], &bitset_stats->types[i]);
-}
-#endif /* BITSET_STATS  */
+    case BITSET_OP_ANDN_OR:
+      bitset_andn (tmp, src1, src2);
+      changed = bitset_or_cmp (dst, src3, tmp);
+      break;
 
+    default:
+      abort ();
+    }
 
-/* Initialise bitset statistics logging.  */
-void
-bitset_stats_init ()
-{
-#if BITSET_STATS
-    bitset_stats = &bitset_stats_data;
-    bitset_stats_read ();
-#endif  /* BITSET_STATS  */
+  bitset_free (tmp);
+  return changed;
 }
 
 
-/* Read bitset statistics file.  */
-static void
-bitset_stats_read ()
+/* DST = (SRC1 & SRC2) | SRC3.  Return non-zero if
+   DST != (SRC1 & SRC2) | SRC3.  */
+int
+bitset_and_or_cmp_ (dst, src1, src2, src3)
+     bitset dst;
+     bitset src1;
+     bitset src2;
+     bitset src3;
 {
-    FILE *file;
-
-    if (!bitset_stats)
-      return;
-
-    file = fopen (BITSET_STATS_FILE, "r");
-    if (file)
-      {
-	if (fread (&bitset_stats_data, sizeof (bitset_stats_data),
-		   1, file) != 1)
-	  {
-	    if (ferror (file))
-	      perror ("Could not read stats file");
-	    else
-	      fprintf (stderr, "Bad stats file size\n");
-	  }
-	fclose (file);
-      }
-    bitset_stats_data.runs++;
+  return bitset_op4_cmp (dst, src1, src2, src3, BITSET_OP_AND_OR);
 }
 
 
-/* Write bitset statistics file.  */
-static void
-bitset_stats_write ()
+/* DST = (SRC1 & ~SRC2) | SRC3.  Return non-zero if
+   DST != (SRC1 & ~SRC2) | SRC3.  */
+int
+bitset_andn_or_cmp_ (dst, src1, src2, src3)
+     bitset dst;
+     bitset src1;
+     bitset src2;
+     bitset src3;
 {
-    FILE *file;
-
-    if (!bitset_stats)
-      return;
-
-    file = fopen (BITSET_STATS_FILE, "w");
-    if (file)
-      {
-	if (fwrite (&bitset_stats_data, sizeof (bitset_stats_data),
-		    1, file) != 1)
-	  perror ("Could not write stats file");
-	fclose (file);
-      }
-    else
-      perror ("Could not open stats file for writing");
+  return bitset_op4_cmp (dst, src1, src2, src3, BITSET_OP_ANDN_OR);
 }
 
 
-/* Dump bitset statistics to FILE.  */
-void
-bitset_stats_dump (file)
-     FILE *file;
+/* DST = (SRC1 | SRC2) & SRC3.  Return non-zero if
+   DST != (SRC1 | SRC2) & SRC3.  */
+int
+bitset_or_and_cmp_ (dst, src1, src2, src3)
+     bitset dst;
+     bitset src1;
+     bitset src2;
+     bitset src3;
 {
-#if BITSET_STATS
-  bitset_stats_print (file, 0);
-  bitset_stats_write ();
-#endif /* BITSET_STATS  */
+  return bitset_op4_cmp (dst, src1, src2, src3, BITSET_OP_OR_AND);
 }
 
 
-/* Function to be called from debugger to print bitset stats.  */
+/* Function to be called from debugger to print bitset.  */
 void
-debug_bitset_stats (void)
+debug_bitset (bset)
+     bitset bset;
 {
-#if BITSET_STATS
-  bitset_stats_print (stderr, 1);
-#endif /* BITSET_STATS  */
+  if (bset)
+    bitset_print (stderr, bset, 1);
 }