fibheap.h: New file.

include/
2001-08-20  Daniel Berlin  <dan@cgsoftware.com>

	* fibheap.h: New file. Fibonacci heap.

libiberty/
2001-08-20  Daniel Berlin  <dan@cgsoftware.com>

	* fibheap.c: New file. Fibonacci heap.

	* Makefile.in (CFILES): Add fibheap.c.
	(REQUIRED_OFILES): Add fibheap.o.
	(fibheap.o): Add dependencies for fibheap.o.

From-SVN: r45062

include/ChangeLog

+2001-08-20  Daniel Berlin  <dan@cgsoftware.com>
+
+	* fibheap.h: New file. Fibonacci heap.
+
 2001-08-18  Zack Weinberg  <zackw@panix.com>
 
 	* ansidecl.h: Reorganize for readability, remove documentation

include/fibheap.h

+/* A Fibonacci heap datatype.
+   Copyright 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
+   Contributed by Daniel Berlin (dan@cgsoftware.com).
+
+This file is part of GNU CC.
+   
+GNU CC 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.
+
+GNU CC 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 GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+/* Fibonacci heaps are somewhat complex, but, there's an
+   article in DDJ on them  that explains them pretty well:
+
+   http://www.ddj.com/articles/1997/9701/9701o/9701o.htm?topic=algoritms
+
+   Introduction to algorithms by Corman and Rivest also goes over
+   them.
+
+   The original paper that introduced them is "Fibonacci heaps and their
+   uses in improved network optimization algorithms" by Tarjan and
+   Fredman (JACM 34(3), July 1987).
+
+   Amortized and real worst case time for operations:
+
+   ExtractMin: O(lg n) amortized. O(n) worst case.
+   DecreaseKey: O(1) amortized.  O(lg n) worst case. 
+   Insert: O(2) amortized. O(1) actual.  
+   Union: O(1) amortized. O(1) actual.
+
+  
+*/
+
+#ifndef _FIBHEAP_H_
+#define _FIBHEAP_H_
+
+#include <ansidecl.h>
+
+typedef struct fibheap
+{
+  size_t nodes;
+  struct fibnode *min;
+  struct fibnode *root;
+} *fibheap_t;
+typedef long fibheapkey_t;
+typedef struct fibnode
+{
+  struct fibnode *parent;
+  struct fibnode *child;
+  struct fibnode *left;
+  struct fibnode *right;
+  unsigned int degree : sizeof(size_t) * CHAR_BIT - 2;
+  unsigned int mark:1;
+  fibheapkey_t key;
+  void *data;
+} *fibnode_t;
+
+extern fibheap_t fibheap_new PARAMS ((void));
+extern fibnode_t fibheap_insert PARAMS ((fibheap_t, fibheapkey_t, void *));
+extern int fibheap_empty PARAMS ((fibheap_t));
+extern fibheapkey_t fibheap_min_key PARAMS ((fibheap_t));
+extern fibheapkey_t fibheap_replace_key PARAMS ((fibheap_t, fibnode_t, fibheapkey_t));
+extern void *fibheap_replace_key_data PARAMS ((fibheap_t, fibnode_t, fibheapkey_t, void *));
+extern void *fibheap_extract_min PARAMS ((fibheap_t));
+extern void *fibheap_min PARAMS ((fibheap_t));
+extern void *fibheap_replace_data PARAMS ((fibheap_t, fibnode_t, void *));
+extern void *fibheap_delete_node PARAMS ((fibheap_t, fibnode_t));
+extern void fibheap_delete PARAMS ((fibheap_t));
+extern fibheap_t fibheap_union PARAMS ((fibheap_t, fibheap_t));
+#endif /* _FIBHEAP_H_ */

libiberty/ChangeLog

+2001-08-20  Daniel Berlin  <dan@cgsoftware.com>
+
+	* fibheap.c: New file. Fibonacci heap.
+
+	* Makefile.in (CFILES): Add fibheap.c.
+	(REQUIRED_OFILES): Add fibheap.o.
+	(fibheap.o): Add dependencies for fibheap.o.
+
 2001-08-17  Christopher Faylor <cgf@cygnus.com>
 
 	* configure.in: Always set HAVE_SYS_ERRLIST when targetting cygwin.

libiberty/Makefile.in

@@ -133,7 +133,7 @@ CFILES = asprintf.c alloca.c argv.c atexit.c basename.c bcmp.c bcopy.c	      \
 	strncasecmp.c strchr.c strdup.c strerror.c strncmp.c strrchr.c        \
 	strsignal.c strstr.c strtod.c strtol.c strtoul.c tmpnam.c vasprintf.c \
 	vfork.c vfprintf.c vprintf.c vsprintf.c waitpid.c xatexit.c xexit.c   \
-	xmalloc.c xmemdup.c xstrdup.c xstrerror.c ternary.c
+	xmalloc.c xmemdup.c xstrdup.c xstrerror.c ternary.c fibheap.c
 
 # These are always included in the library.
 REQUIRED_OFILES = argv.o alloca.o choose-temp.o concat.o cplus-dem.o          \
@@ -142,7 +142,7 @@ REQUIRED_OFILES = argv.o alloca.o choose-temp.o concat.o cplus-dem.o          \
         md5.o make-temp-file.o objalloc.o				      \
 	obstack.o partition.o pexecute.o regex.o safe-ctype.o sort.o spaces.o \
 	splay-tree.o strerror.o strsignal.o xatexit.o xexit.o xmalloc.o       \
-	xmemdup.o xstrdup.o xstrerror.o ternary.o
+	xmemdup.o xstrdup.o xstrerror.o ternary.o fibheap.o
 
 $(TARGETLIB): $(REQUIRED_OFILES) $(EXTRA_OFILES) $(LIBOBJS)
 	-rm -f $(TARGETLIB)
@@ -265,6 +265,7 @@ cplus-dem.o: config.h $(INCDIR)/demangle.h
 cp-demangle.o: config.h $(INCDIR)/dyn-string.h $(INCDIR)/demangle.h
 dyn-string.o: config.h $(INCDIR)/dyn-string.h
 fdmatch.o: $(INCDIR)/libiberty.h
+fibheap.o: $(INCDIR)/libiberty.h $(INCDIR)/fibheap.h
 fnmatch.o: config.h $(INCDIR)/fnmatch.h
 getcwd.o: config.h
 getopt.o: config.h $(INCDIR)/getopt.h