2007-04-01 Daniel Berlin <dberlin@dberlin.org>

	* ebitmap.h: New file
	* ebitmap.c: New file
	* Makefile.in (ebitmap.o): New target.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@123415 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 165 insertions, 0 deletions

diff --git a/gcc/ebitmap.h b/gcc/ebitmap.h
new file mode 100644
index 00000000000..175c9110912
--- /dev/null
+++ b/gcc/ebitmap.h
@@ -0,0 +1,165 @@
+/* Sparse array based bitmaps.
+   Copyright (C) 2007 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC 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, or (at your option) any later
+version.
+
+GCC 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 GCC; see the file COPYING.  If not, write to the Free
+Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA.  */
+
+#ifndef GCC_EBITMAP_H
+#define GCC_EBITMAP_H
+
+#include "sbitmap.h"
+
+#define EBITMAP_ELT_BITS ((unsigned) HOST_BITS_PER_WIDEST_FAST_INT)
+#define EBITMAP_ELT_TYPE unsigned HOST_WIDEST_FAST_INT
+
+typedef struct ebitmap_def
+{  
+  unsigned int n_elts;		/* number of elements in the array.  */
+  sbitmap wordmask;		/* wordmask saying which words are
+				   non-zero.  */
+  unsigned int numwords;	/* number of non-zero words.  */
+  unsigned int cacheindex;	/* which word cache is.  */
+  EBITMAP_ELT_TYPE *elts;	/* non-zero element array.  */
+  EBITMAP_ELT_TYPE *cache;	/* last tested element, or NULL.  */
+} *ebitmap;
+
+
+#define ebitmap_empty_p(MAP) ((MAP)->numwords == 0)
+#define ebitmap_free(MAP)  (free((MAP)->elts), \
+			    sbitmap_free ((MAP)->wordmask),	\
+			    free((MAP)))
+
+extern void ebitmap_set_bit (ebitmap, unsigned int);
+extern void ebitmap_clear_bit (ebitmap, unsigned int);
+extern bool ebitmap_bit_p (ebitmap, unsigned int);
+extern void dump_ebitmap (FILE *, ebitmap);
+extern void dump_ebitmap_file (FILE *, ebitmap);
+extern void dump_ebitmap_vector (FILE *, const char *, const char *, ebitmap *,
+				 int);
+extern ebitmap ebitmap_alloc (unsigned int);
+extern ebitmap *ebitmap_vector_alloc (unsigned int, unsigned int);
+extern void ebitmap_copy (ebitmap, ebitmap);
+extern void ebitmap_and (ebitmap, ebitmap, ebitmap);
+extern void ebitmap_and_into (ebitmap, ebitmap);
+extern bool ebitmap_and_compl (ebitmap, ebitmap, ebitmap);
+extern bool ebitmap_and_compl_into (ebitmap, ebitmap);
+extern bool ebitmap_ior_into (ebitmap, ebitmap);
+extern bool ebitmap_ior (ebitmap, ebitmap, ebitmap);
+extern bool ebitmap_ior_and_compl (ebitmap, ebitmap, ebitmap, ebitmap);
+extern bool ebitmap_ior_and_compl_into (ebitmap, ebitmap, ebitmap);
+extern bool ebitmap_equal_p (ebitmap, ebitmap);
+extern void ebitmap_clear (ebitmap);
+extern int ebitmap_last_set_bit (ebitmap);
+extern void debug_ebitmap (ebitmap);
+extern void dump_ebitmap (FILE *, ebitmap);
+extern unsigned long ebitmap_popcount(ebitmap, unsigned long);
+
+/* The iterator for ebitmap.  */
+typedef struct {
+  /* The pointer to the first word of the bitmap.  */
+  EBITMAP_ELT_TYPE *ptr;
+
+  /* Element number inside ptr that we are at.  */
+  unsigned int eltnum;
+
+  /* The size of the bitmap.  */
+  unsigned int size;
+
+  /* Current bit index.  */
+  unsigned int bit_num;
+
+  /* The words currently visited.  */
+  EBITMAP_ELT_TYPE word;
+
+  /* The word mask iterator.  */
+  sbitmap_iterator maskiter;
+} ebitmap_iterator;
+  
+static inline void
+ebitmap_iter_init (ebitmap_iterator *i, ebitmap bmp, unsigned int min)
+{
+  sbitmap_iter_init (&i->maskiter, bmp->wordmask, 
+		     min / EBITMAP_ELT_BITS);
+  i->size = bmp->numwords;
+  if (i->size == 0)
+    return;
+  i->ptr = bmp->elts;
+  i->bit_num = min;
+  i->eltnum = 0;
+
+  if ((min / EBITMAP_ELT_BITS) >= bmp->wordmask->n_bits)
+    {
+      i->word = 0;
+    }
+  else
+    {
+      if (TEST_BIT (bmp->wordmask, min / EBITMAP_ELT_BITS) == 0)
+	i->word = 0;
+      else
+	{
+	  unsigned int wordindex = min / EBITMAP_ELT_BITS;
+	  unsigned int count = sbitmap_popcount (bmp->wordmask, wordindex);
+	  i->word = i->ptr[count] >> (i->bit_num % (unsigned int)EBITMAP_ELT_BITS);
+	  i->eltnum = count + 1;
+	}
+    }
+}
+
+static inline bool
+ebitmap_iter_cond (ebitmap_iterator *i, unsigned int *n)
+{
+  unsigned int ourn;
+
+  if (i->size == 0)
+    return false;
+
+  if (i->word == 0)
+    {
+      sbitmap_iter_next (&i->maskiter);
+      if (!sbitmap_iter_cond (&i->maskiter, &ourn))
+	return false;
+      i->bit_num = ourn * EBITMAP_ELT_BITS;
+      i->word = i->ptr[i->eltnum++];
+    }
+
+  /* Skip bits that are zero.  */
+
+  for (; (i->word & 1) == 0; i->word >>= 1)
+    i->bit_num++;
+
+  *n = i->bit_num;
+  return true;
+}
+
+static inline void
+ebitmap_iter_next (ebitmap_iterator *i)
+{
+  i->word >>= 1;
+  i->bit_num++;
+}
+
+/* Loop over all elements of EBITMAP, starting with MIN.  In each
+   iteration, N is set to the index of the bit being visited.  ITER is
+   an instance of ebitmap_iterator used to iterate the bitmap.  */
+
+#define EXECUTE_IF_SET_IN_EBITMAP(EBITMAP, MIN, N, ITER)	\
+  for (ebitmap_iter_init (&(ITER), (EBITMAP), (MIN));		\
+       ebitmap_iter_cond (&(ITER), &(N));			\
+       ebitmap_iter_next (&(ITER)))
+
+
+#endif /* ! GCC_EBITMAP_H */