diff --git a/string/strcoll_l.c b/string/strcoll_l.c

index ecda08f..ec630fe 100644

--- a/string/strcoll_l.c

+++ b/string/strcoll_l.c

@@ -41,11 +41,434 @@

 #include "../locale/localeinfo.h"

+/* Track status while looking for sequences in a string.  */

+typedef struct

+{

+  int len;			/* Length of the current sequence.  */

+  int val;			/* Position of the sequence relative to the

+				   previous non-ignored sequence.  */

+  size_t idxnow;		/* Current index in sequences.  */

+  size_t idxmax;		/* Maximum index in sequences.  */

+  size_t idxcnt;		/* Current count of indeces.  */

+  size_t backw;			/* Current Backward sequence index.  */

+  size_t backw_stop;		/* Index where the backward sequences stop.  */

+  const USTRING_TYPE *us;	/* The string.  */

+  int32_t *idxarr;		/* Array to cache weight indeces.  */

+  unsigned char *rulearr;	/* Array to cache rules.  */

+  unsigned char rule;		/* Saved rule for the first sequence.  */

+  int32_t idx;			/* Index to weight of the current sequence.  */

+  int32_t save_idx;		/* Save looked up index of a forward

+				   sequence after the last backward

+				   sequence.  */

+  const USTRING_TYPE *back_us;	/* Beginning of the backward sequence.  */

+} coll_seq;

+

+/* Get next sequence.  The weight indeces are cached, so we don't need to

+   traverse the string.  */

+static void

+get_next_seq_cached (coll_seq *seq, int nrules, int pass,

+		     const unsigned char *rulesets,

+		     const USTRING_TYPE *weights)

+{

+  int val = seq->val = 0;

+  int len = seq->len;

+  size_t backw_stop = seq->backw_stop;

+  size_t backw = seq->backw;

+  size_t idxcnt = seq->idxcnt;

+  size_t idxmax = seq->idxmax;

+  size_t idxnow = seq->idxnow;

+  unsigned char *rulearr = seq->rulearr;

+  int32_t *idxarr = seq->idxarr;

+

+  while (len == 0)

+    {

+      ++val;

+      if (backw_stop != ~0ul)

+	{

+	  /* The is something pushed.  */

+	  if (backw == backw_stop)

+	    {

+	      /* The last pushed character was handled.  Continue

+		 with forward characters.  */

+	      if (idxcnt < idxmax)

+		{

+		  idxnow = idxcnt;

+		  backw_stop = ~0ul;

+		}

+	      else

+		{

+		  /* Nothing anymore.  The backward sequence

+		     ended with the last sequence in the string.  */

+		  idxnow = ~0ul;

+		  break;

+		}

+	    }

+	  else

+	    idxnow = --backw;

+	}

+      else

+	{

+	  backw_stop = idxcnt;

+

+	  while (idxcnt < idxmax)

+	    {

+	      if ((rulesets[rulearr[idxcnt] * nrules + pass]

+		   & sort_backward) == 0)

+		/* No more backward characters to push.  */

+		break;

+	      ++idxcnt;

+	    }

+

+	  if (backw_stop == idxcnt)

+	    {

+	      /* No sequence at all or just one.  */

+	      if (idxcnt == idxmax)

+		/* Note that seq1len is still zero.  */

+		break;

+

+	      backw_stop = ~0ul;

+	      idxnow = idxcnt++;

+	    }

+	  else

+	    /* We pushed backward sequences.  */

+	    idxnow = backw = idxcnt - 1;

+	}

+      len = weights[idxarr[idxnow]++];

+    }

+

+  /* Update the structure.  */

+  seq->val = val;

+  seq->len = len;

+  seq->backw_stop = backw_stop;

+  seq->backw = backw;

+  seq->idxcnt = idxcnt;

+  seq->idxnow = idxnow;

+}

+

+/* Get next sequence.  Traverse the string as required.  */

+static void

+get_next_seq (coll_seq *seq, int nrules, const unsigned char *rulesets,

+	      const USTRING_TYPE *weights, const int32_t *table,

+	      const USTRING_TYPE *extra, const int32_t *indirect)

+{

+#include WEIGHT_H

+  int val = seq->val = 0;

+  int len = seq->len;

+  size_t backw_stop = seq->backw_stop;

+  size_t backw = seq->backw;

+  size_t idxcnt = seq->idxcnt;

+  size_t idxmax = seq->idxmax;

+  size_t idxnow = seq->idxnow;

+  unsigned char *rulearr = seq->rulearr;

+  int32_t *idxarr = seq->idxarr;

+  const USTRING_TYPE *us = seq->us;

+

+  while (len == 0)

+    {

+      ++val;

+      if (backw_stop != ~0ul)

+	{

+	  /* The is something pushed.  */

+	  if (backw == backw_stop)

+	    {

+	      /* The last pushed character was handled.  Continue

+		 with forward characters.  */

+	      if (idxcnt < idxmax)

+		{

+		  idxnow = idxcnt;

+		  backw_stop = ~0ul;

+		}

+	      else

+		/* Nothing anymore.  The backward sequence ended with

+		   the last sequence in the string.  Note that seq2len

+		   is still zero.  */

+		break;

+	    }

+	  else

+	    idxnow = --backw;

+	}

+      else

+	{

+	  backw_stop = idxmax;

+

+	  while (*us != L('\0'))

+	    {

+	      int32_t tmp = findidx (&us, -1);

+	      rulearr[idxmax] = tmp >> 24;

+	      idxarr[idxmax] = tmp & 0xffffff;

+	      idxcnt = idxmax++;

+

+	      if ((rulesets[rulearr[idxcnt] * nrules]

+		   & sort_backward) == 0)

+		/* No more backward characters to push.  */

+		break;

+	      ++idxcnt;

+	    }

+

+	  if (backw_stop >= idxcnt)

+	    {

+	      /* No sequence at all or just one.  */

+	      if (idxcnt == idxmax || backw_stop > idxcnt)

+		/* Note that seq1len is still zero.  */

+		break;

+

+	      backw_stop = ~0ul;

+	      idxnow = idxcnt;

+	    }

+	  else

+	    /* We pushed backward sequences.  */

+	    idxnow = backw = idxcnt - 1;

+	}

+      len = weights[idxarr[idxnow]++];

+    }

+

+  /* Update the structure.  */

+  seq->val = val;

+  seq->len = len;

+  seq->backw_stop = backw_stop;

+  seq->backw = backw;

+  seq->idxcnt = idxcnt;

+  seq->idxmax = idxmax;

+  seq->idxnow = idxnow;

+  seq->us = us;

+}

+

+/* Get next sequence.  Traverse the string as required.  This function does not

+   set or use any index or rule cache.  */

+static void

+get_next_seq_nocache (coll_seq *seq, int nrules, const unsigned char *rulesets,

+		      const USTRING_TYPE *weights, const int32_t *table,

+		      const USTRING_TYPE *extra, const int32_t *indirect,

+		      int pass)

+{

+#include WEIGHT_H

+  int val = seq->val = 0;

+  int len = seq->len;

+  size_t backw_stop = seq->backw_stop;

+  size_t backw = seq->backw;

+  size_t idxcnt = seq->idxcnt;

+  size_t idxmax = seq->idxmax;

+  int32_t idx = seq->idx;

+  const USTRING_TYPE *us = seq->us;

+

+  while (len == 0)

+    {

+      ++val;

+      if (backw_stop != ~0ul)

+	{

+	  /* The is something pushed.  */

+	  if (backw == backw_stop)

+	    {

+	      /* The last pushed character was handled.  Continue

+		 with forward characters.  */

+	      if (idxcnt < idxmax)

+		{

+		  idx = seq->save_idx;

+		  backw_stop = ~0ul;

+		}

+	      else

+		{

+		  /* Nothing anymore.  The backward sequence ended with

+		     the last sequence in the string.  Note that len is

+		     still zero.  */

+		  idx = 0;

+		  break;

+	        }

+	    }

+	  else

+	    {

+	      /* XXX Traverse BACKW sequences from the beginning of

+		 BACKW_STOP to get the next sequence.  Is ther a quicker way

+	         to do this?  */

+	      int i = backw_stop;

+	      us = seq->back_us;

+	      while (i < backw)

+		{

+		  int32_t tmp = findidx (&us, -1);

+		  idx = tmp & 0xffffff;

+		  i++;

+		}

+	      --backw;

+	      us = seq->us;

+	    }

+	}

+      else

+	{

+	  backw_stop = idxmax;

+	  int32_t prev_idx = idx;

+

+	  while (*us != L('\0'))

+	    {

+	      int32_t tmp = findidx (&us, -1);

+	      unsigned char rule = tmp >> 24;

+	      prev_idx = idx;

+	      idx = tmp & 0xffffff;

+	      idxcnt = idxmax++;

+

+	      /* Save the rule for the first sequence.  */

+	      if (__glibc_unlikely (idxcnt == 0))

+	        seq->rule = rule;

+

+	      if ((rulesets[rule * nrules + pass]

+		   & sort_backward) == 0)

+		/* No more backward characters to push.  */

+		break;

+	      ++idxcnt;

+	    }

+

+	  if (backw_stop >= idxcnt)

+	    {

+	      /* No sequence at all or just one.  */

+	      if (idxcnt == idxmax || backw_stop > idxcnt)

+		/* Note that len is still zero.  */

+		break;

+

+	      backw_stop = ~0ul;

+	    }

+	  else

+	    {

+	      /* We pushed backward sequences.  If the stream ended with the

+		 backward sequence, then we process the last sequence we

+		 found.  Otherwise we process the sequence before the last

+		 one since the last one was a forward sequence.  */

+	      seq->back_us = seq->us;

+	      seq->us = us;

+	      backw = idxcnt;

+	      if (idxmax > idxcnt)

+		{

+		  backw--;

+		  seq->save_idx = idx;

+		  idx = prev_idx;

+		}

+	      if (backw > backw_stop)

+		backw--;

+	    }

+	}

+

+      len = weights[idx++];

+      /* Skip over indeces of previous levels.  */

+      for (int i = 0; i < pass; i++)

+	{

+	  idx += len;

+	  len = weights[idx];

+	  idx++;

+	}

+    }

+

+  /* Update the structure.  */

+  seq->val = val;

+  seq->len = len;

+  seq->backw_stop = backw_stop;

+  seq->backw = backw;

+  seq->idxcnt = idxcnt;

+  seq->idxmax = idxmax;

+  seq->us = us;

+  seq->idx = idx;

+}

+

+/* Compare two sequences.  This version does not use the index and rules

+   cache.  */

+static int

+do_compare_nocache (coll_seq *seq1, coll_seq *seq2, int position,

+		    const USTRING_TYPE *weights)

+{

+  int seq1len = seq1->len;

+  int seq2len = seq2->len;

+  int val1 = seq1->val;

+  int val2 = seq2->val;

+  int idx1 = seq1->idx;

+  int idx2 = seq2->idx;

+  int result = 0;

+

+  /* Test for position if necessary.  */

+  if (position && val1 != val2)

+    {

+      result = val1 - val2;

+      goto out;

+    }

+

+  /* Compare the two sequences.  */

+  do

+    {

+      if (weights[idx1] != weights[idx2])

+	{

+	  /* The sequences differ.  */

+	  result = weights[idx1] - weights[idx2];

+	  goto out;

+	}

+

+      /* Increment the offsets.  */

+      ++idx1;

+      ++idx2;

+

+      --seq1len;

+      --seq2len;

+    }

+  while (seq1len > 0 && seq2len > 0);

+

+  if (position && seq1len != seq2len)

+    result = seq1len - seq2len;

+

+out:

+  seq1->len = seq1len;

+  seq2->len = seq2len;

+  seq1->idx = idx1;

+  seq2->idx = idx2;

+  return result;

+}

+

+/* Compare two sequences using the index cache.  */

+static int

+do_compare (coll_seq *seq1, coll_seq *seq2, int position,

+	    const USTRING_TYPE *weights)

+{

+  int seq1len = seq1->len;

+  int seq2len = seq2->len;

+  int val1 = seq1->val;

+  int val2 = seq2->val;

+  int32_t *idx1arr = seq1->idxarr;

+  int32_t *idx2arr = seq2->idxarr;

+  int idx1now = seq1->idxnow;

+  int idx2now = seq2->idxnow;

+  int result = 0;

+

+  /* Test for position if necessary.  */

+  if (position && val1 != val2)

+    {

+      result = val1 - val2;

+      goto out;

+    }

+

+  /* Compare the two sequences.  */

+  do

+    {

+      if (weights[idx1arr[idx1now]] != weights[idx2arr[idx2now]])

+	{

+	  /* The sequences differ.  */

+	  result = weights[idx1arr[idx1now]] - weights[idx2arr[idx2now]];

+	  goto out;

+	}

+

+      /* Increment the offsets.  */

+      ++idx1arr[idx1now];

+      ++idx2arr[idx2now];

+

+      --seq1len;

+      --seq2len;

+    }

+  while (seq1len > 0 && seq2len > 0);

+

+  if (position && seq1len != seq2len)

+    result = seq1len - seq2len;

+

+out:

+  seq1->len = seq1len;

+  seq2->len = seq2len;

+  return result;

+}

+

 int

-STRCOLL (s1, s2, l)

-     const STRING_TYPE *s1;

-     const STRING_TYPE *s2;

-     __locale_t l;

+STRCOLL (const STRING_TYPE *s1, const STRING_TYPE *s2, __locale_t l)

 {

   struct __locale_data *current = l->__locales[LC_COLLATE];

   uint_fast32_t nrules = current->values[_NL_ITEM_INDEX (_NL_COLLATE_NRULES)].word;

@@ -56,34 +479,6 @@ STRCOLL (s1, s2, l)

   const USTRING_TYPE *weights;

   const USTRING_TYPE *extra;

   const int32_t *indirect;

-  uint_fast32_t pass;

-  int result = 0;

-  const USTRING_TYPE *us1;

-  const USTRING_TYPE *us2;

-  size_t s1len;

-  size_t s2len;

-  int32_t *idx1arr;

-  int32_t *idx2arr;

-  unsigned char *rule1arr;

-  unsigned char *rule2arr;

-  size_t idx1max;

-  size_t idx2max;

-  size_t idx1cnt;

-  size_t idx2cnt;

-  size_t idx1now;

-  size_t idx2now;

-  size_t backw1_stop;

-  size_t backw2_stop;

-  size_t backw1;

-  size_t backw2;

-  int val1;

-  int val2;

-  int position;

-  int seq1len;

-  int seq2len;

-  int use_malloc;

-

-#include WEIGHT_H

   if (nrules == 0)

     return STRCMP (s1, s2);

@@ -98,7 +493,6 @@ STRCOLL (s1, s2, l)

     current->values[_NL_ITEM_INDEX (CONCAT(_NL_COLLATE_EXTRA,SUFFIX))].string;

   indirect = (const int32_t *)

     current->values[_NL_ITEM_INDEX (CONCAT(_NL_COLLATE_INDIRECT,SUFFIX))].string;

-  use_malloc = 0;

   assert (((uintptr_t) table) % __alignof__ (table[0]) == 0);

   assert (((uintptr_t) weights) % __alignof__ (weights[0]) == 0);

@@ -106,18 +500,13 @@ STRCOLL (s1, s2, l)

   assert (((uintptr_t) indirect) % __alignof__ (indirect[0]) == 0);

   /* We need this a few times.  */

-  s1len = STRLEN (s1);

-  s2len = STRLEN (s2);

+  size_t s1len = STRLEN (s1);

+  size_t s2len = STRLEN (s2);

   /* Catch empty strings.  */

-  if (__builtin_expect (s1len == 0, 0) || __builtin_expect (s2len == 0, 0))

+  if (__glibc_unlikely (s1len == 0) || __glibc_unlikely (s2len == 0))

     return (s1len != 0) - (s2len != 0);

-  /* We need the elements of the strings as unsigned values since they

-     are used as indeces.  */

-  us1 = (const USTRING_TYPE *) s1;

-  us2 = (const USTRING_TYPE *) s2;

-

   /* Perform the first pass over the string and while doing this find

      and store the weights for each character.  Since we want this to

      be as fast as possible we are using `alloca' to store the temporary

@@ -127,411 +516,124 @@ STRCOLL (s1, s2, l)

      Please note that the localedef programs makes sure that `position'

      is not used at the first level.  */

-  if (! __libc_use_alloca ((s1len + s2len) * (sizeof (int32_t) + 1)))

-    {

-      idx1arr = (int32_t *) malloc ((s1len + s2len) * (sizeof (int32_t) + 1));

-      idx2arr = &idx1arr[s1len];

-      rule1arr = (unsigned char *) &idx2arr[s2len];

-      rule2arr = &rule1arr[s1len];

-

-      if (idx1arr == NULL)

-	/* No memory.  Well, go with the stack then.

-

-	   XXX Once this implementation is stable we will handle this

-	   differently.  Instead of precomputing the indeces we will

-	   do this in time.  This means, though, that this happens for

-	   every pass again.  */

-	goto try_stack;

-      use_malloc = 1;

-    }

-  else

-    {

-    try_stack:

-      idx1arr = (int32_t *) alloca (s1len * sizeof (int32_t));

-      idx2arr = (int32_t *) alloca (s2len * sizeof (int32_t));

-      rule1arr = (unsigned char *) alloca (s1len);

-      rule2arr = (unsigned char *) alloca (s2len);

-    }

-  idx1cnt = 0;

-  idx2cnt = 0;

-  idx1max = 0;

-  idx2max = 0;

-  idx1now = 0;

-  idx2now = 0;

-  backw1_stop = ~0ul;

-  backw2_stop = ~0ul;

-  backw1 = ~0ul;

-  backw2 = ~0ul;

-  seq1len = 0;

-  seq2len = 0;

-  position = rulesets[0] & sort_position;

-  while (1)

-    {

-      val1 = 0;

-      val2 = 0;

-

-      /* Get the next non-IGNOREd element for string `s1'.  */

-      if (seq1len == 0)

-	do

-	  {

-	    ++val1;

-

-	    if (backw1_stop != ~0ul)

-	      {

-		/* The is something pushed.  */

-		if (backw1 == backw1_stop)

-		  {

-		    /* The last pushed character was handled.  Continue

-		       with forward characters.  */

-		    if (idx1cnt < idx1max)

-		      {

-			idx1now = idx1cnt;

-			backw1_stop = ~0ul;

-		      }

-		    else

-		      /* Nothing anymore.  The backward sequence ended with

-			 the last sequence in the string.  Note that seq1len

-			 is still zero.  */

-		      break;

-		  }

-		else

-		  idx1now = --backw1;

-	      }

-	    else

-	      {

-		backw1_stop = idx1max;

-

-		while (*us1 != L('\0'))

-		  {

-		    int32_t tmp = findidx (&us1, -1);

-		    rule1arr[idx1max] = tmp >> 24;

-		    idx1arr[idx1max] = tmp & 0xffffff;

-		    idx1cnt = idx1max++;

-

-		    if ((rulesets[rule1arr[idx1cnt] * nrules]

-			 & sort_backward) == 0)

-		      /* No more backward characters to push.  */

-		      break;

-		    ++idx1cnt;

-		  }

-

-		if (backw1_stop >= idx1cnt)

-		  {

-		    /* No sequence at all or just one.  */

-		    if (idx1cnt == idx1max || backw1_stop > idx1cnt)

-		      /* Note that seq1len is still zero.  */

-		      break;

-

-		    backw1_stop = ~0ul;

-		    idx1now = idx1cnt;

-		  }

-		else

-		  /* We pushed backward sequences.  */

-		  idx1now = backw1 = idx1cnt - 1;

-	      }

-	  }

-	while ((seq1len = weights[idx1arr[idx1now]++]) == 0);

-

-      /* And the same for string `s2'.  */

-      if (seq2len == 0)

-	do

-	  {

-	    ++val2;

-

-	    if (backw2_stop != ~0ul)

-	      {

-		/* The is something pushed.  */

-		if (backw2 == backw2_stop)

-		  {

-		    /* The last pushed character was handled.  Continue

-		       with forward characters.  */

-		    if (idx2cnt < idx2max)

-		      {

-			idx2now = idx2cnt;

-			backw2_stop = ~0ul;

-		      }

-		    else

-		      /* Nothing anymore.  The backward sequence ended with

-			 the last sequence in the string.  Note that seq2len

-			 is still zero.  */

-		      break;

-		  }

-		else

-		  idx2now = --backw2;

-	      }

-	    else

-	      {

-		backw2_stop = idx2max;

-

-		while (*us2 != L('\0'))

-		  {

-		    int32_t tmp = findidx (&us2, -1);

-		    rule2arr[idx2max] = tmp >> 24;

-		    idx2arr[idx2max] = tmp & 0xffffff;

-		    idx2cnt = idx2max++;

-

-		    if ((rulesets[rule2arr[idx2cnt] * nrules]

-			 & sort_backward) == 0)

-		      /* No more backward characters to push.  */

-		      break;

-		    ++idx2cnt;

-		  }

-

-		if (backw2_stop >= idx2cnt)

-		  {

-		    /* No sequence at all or just one.  */

-		    if (idx2cnt == idx2max || backw2_stop > idx2cnt)

-		      /* Note that seq1len is still zero.  */

-		      break;

-

-		    backw2_stop = ~0ul;

-		    idx2now = idx2cnt;

-		  }

-		else

-		  /* We pushed backward sequences.  */

-		  idx2now = backw2 = idx2cnt - 1;

-	      }

-	  }

-	while ((seq2len = weights[idx2arr[idx2now]++]) == 0);

-

-      /* See whether any or both strings are empty.  */

-      if (seq1len == 0 || seq2len == 0)

-	{

-	  if (seq1len == seq2len)

-	    /* Both ended.  So far so good, both strings are equal at the

-	       first level.  */

-	    break;

-

-	  /* This means one string is shorter than the other.  Find out

-	     which one and return an appropriate value.  */

-	  result = seq1len == 0 ? -1 : 1;

-	  goto free_and_return;

-	}

+  coll_seq seq1, seq2;

+  bool use_malloc = false;

+  int result = 0;

-      /* Test for position if necessary.  */

-      if (position && val1 != val2)

-	{

-	  result = val1 - val2;

-	  goto free_and_return;

-	}

+  memset (&seq1, 0, sizeof (seq1));

+  seq2 = seq1;

-      /* Compare the two sequences.  */

-      do

-	{

-	  if (weights[idx1arr[idx1now]] != weights[idx2arr[idx2now]])

-	    {

-	      /* The sequences differ.  */

-	      result = weights[idx1arr[idx1now]] - weights[idx2arr[idx2now]];

-	      goto free_and_return;

-	    }

+  size_t size_max = SIZE_MAX / (sizeof (int32_t) + 1);

-	  /* Increment the offsets.  */

-	  ++idx1arr[idx1now];

-	  ++idx2arr[idx2now];

+  /* If the strings are long enough to cause overflow in the size request, then

+     skip the allocation and proceed with the non-cached routines.  */

+  if (MIN (s1len, s2len) > size_max

+      || MAX (s1len, s2len) > size_max - MIN (s1len, s2len))

+    goto begin_collate;

-	  --seq1len;

-	  --seq2len;

-	}

-      while (seq1len > 0 && seq2len > 0);

+  if (! __libc_use_alloca ((s1len + s2len) * (sizeof (int32_t) + 1)))

+    {

+      seq1.idxarr = (int32_t *) malloc ((s1len + s2len) * (sizeof (int32_t) + 1));

-      if (position && seq1len != seq2len)

+      /* If we failed to allocate memory, we leave everything as NULL so that

+	 we use the nocache version of traversal and comparison functions.  */

+      if (seq1.idxarr != NULL)

 	{

-	  result = seq1len - seq2len;

-	  goto free_and_return;

+	  seq2.idxarr = &seq1.idxarr[s1len];

+	  seq1.rulearr = (unsigned char *) &seq2.idxarr[s2len];

+	  seq2.rulearr = &seq1.rulearr[s1len];

+	  use_malloc = true;

 	}

     }

+  else

+    {

+      seq1.idxarr = (int32_t *) alloca (s1len * sizeof (int32_t));

+      seq2.idxarr = (int32_t *) alloca (s2len * sizeof (int32_t));

+      seq1.rulearr = (unsigned char *) alloca (s1len);

+      seq2.rulearr = (unsigned char *) alloca (s2len);

+    }

-  /* Now the remaining passes over the weights.  We now use the

-     indeces we found before.  */

-  for (pass = 1; pass < nrules; ++pass)

+  int rule;

+

+ begin_collate:

+  rule = 0;

+  /* Cache values in the first pass and if needed, use them in subsequent

+     passes.  */

+  for (int pass = 0; pass < nrules; ++pass)

     {

+      seq1.idxcnt = 0;

+      seq1.idx = 0;

+      seq1.idx = 0;

+      seq1.backw_stop = ~0ul;

+      seq1.backw = ~0ul;

+      seq2.idxcnt = 0;

+      seq2.backw_stop = ~0ul;

+      seq2.backw = ~0ul;

+

+      /* We need the elements of the strings as unsigned values since they

+	 are used as indeces.  */

+      seq1.us = (const USTRING_TYPE *) s1;

+      seq2.us = (const USTRING_TYPE *) s2;

+

       /* We assume that if a rule has defined `position' in one section

 	 this is true for all of them.  */

-      idx1cnt = 0;

-      idx2cnt = 0;

-      backw1_stop = ~0ul;

-      backw2_stop = ~0ul;

-      backw1 = ~0ul;

-      backw2 = ~0ul;

-      position = rulesets[rule1arr[0] * nrules + pass] & sort_position;

+      int position = rulesets[rule * nrules + pass] & sort_position;

       while (1)

 	{

-	  val1 = 0;

-	  val2 = 0;

-

-	  /* Get the next non-IGNOREd element for string `s1'.  */

-	  if (seq1len == 0)

-	    do

-	      {

-		++val1;

-

-		if (backw1_stop != ~0ul)

-		  {

-		    /* The is something pushed.  */

-		    if (backw1 == backw1_stop)

-		      {

-			/* The last pushed character was handled.  Continue

-			   with forward characters.  */

-			if (idx1cnt < idx1max)

-			  {

-			    idx1now = idx1cnt;

-			    backw1_stop = ~0ul;

-			  }

-			else

-			  {

-			    /* Nothing anymore.  The backward sequence

-			       ended with the last sequence in the string.  */

-			    idx1now = ~0ul;

-			    break;

-			  }

-		      }

-		    else

-		      idx1now = --backw1;

-		  }

-		else

-		  {

-		    backw1_stop = idx1cnt;

-

-		    while (idx1cnt < idx1max)

-		      {

-			if ((rulesets[rule1arr[idx1cnt] * nrules + pass]

-			     & sort_backward) == 0)

-			  /* No more backward characters to push.  */

-			  break;

-			++idx1cnt;

-		      }

-

-		    if (backw1_stop == idx1cnt)

-		      {

-			/* No sequence at all or just one.  */

-			if (idx1cnt == idx1max)

-			  /* Note that seq1len is still zero.  */

-			  break;

-

-			backw1_stop = ~0ul;

-			idx1now = idx1cnt++;

-		      }

-		    else

-		      /* We pushed backward sequences.  */

-		      idx1now = backw1 = idx1cnt - 1;

-		  }

-	      }

-	    while ((seq1len = weights[idx1arr[idx1now]++]) == 0);

-

-	  /* And the same for string `s2'.  */

-	  if (seq2len == 0)

-	    do

-	      {

-		++val2;

-

-		if (backw2_stop != ~0ul)

-		  {

-		    /* The is something pushed.  */

-		    if (backw2 == backw2_stop)

-		      {

-			/* The last pushed character was handled.  Continue

-			   with forward characters.  */

-			if (idx2cnt < idx2max)

-			  {

-			    idx2now = idx2cnt;

-			    backw2_stop = ~0ul;

-			  }

-			else

-			  {