merge from gcc
This commit is contained in:
DJ Delorie
parent
410f7a1290
commit
8e777d6aa9
@ -1,3 +1,7 @@
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2001-08-20 Daniel Berlin <dan@cgsoftware.com>
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* fibheap.h: New file. Fibonacci heap.
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2001-08-20 Andrew Cagney <ac131313@redhat.com>
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* floatformat.h (floatformat_arm_ext): Document as deprecated.
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80
include/fibheap.h
Normal file
80
include/fibheap.h
Normal file
@ -0,0 +1,80 @@
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/* A Fibonacci heap datatype.
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Copyright 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
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Contributed by Daniel Berlin (dan@cgsoftware.com).
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* Fibonacci heaps are somewhat complex, but, there's an
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article in DDJ on them that explains them pretty well:
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http://www.ddj.com/articles/1997/9701/9701o/9701o.htm?topic=algoritms
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Introduction to algorithms by Corman and Rivest also goes over
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them.
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The original paper that introduced them is "Fibonacci heaps and their
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uses in improved network optimization algorithms" by Tarjan and
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Fredman (JACM 34(3), July 1987).
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Amortized and real worst case time for operations:
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ExtractMin: O(lg n) amortized. O(n) worst case.
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DecreaseKey: O(1) amortized. O(lg n) worst case.
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Insert: O(2) amortized. O(1) actual.
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Union: O(1) amortized. O(1) actual.
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*/
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#ifndef _FIBHEAP_H_
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#define _FIBHEAP_H_
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#include <ansidecl.h>
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typedef struct fibheap
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{
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size_t nodes;
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struct fibnode *min;
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struct fibnode *root;
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} *fibheap_t;
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typedef long fibheapkey_t;
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typedef struct fibnode
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{
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struct fibnode *parent;
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struct fibnode *child;
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struct fibnode *left;
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struct fibnode *right;
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unsigned int degree : sizeof(size_t) * CHAR_BIT - 2;
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unsigned int mark:1;
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fibheapkey_t key;
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void *data;
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} *fibnode_t;
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extern fibheap_t fibheap_new PARAMS ((void));
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extern fibnode_t fibheap_insert PARAMS ((fibheap_t, fibheapkey_t, void *));
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extern int fibheap_empty PARAMS ((fibheap_t));
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extern fibheapkey_t fibheap_min_key PARAMS ((fibheap_t));
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extern fibheapkey_t fibheap_replace_key PARAMS ((fibheap_t, fibnode_t, fibheapkey_t));
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extern void *fibheap_replace_key_data PARAMS ((fibheap_t, fibnode_t, fibheapkey_t, void *));
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extern void *fibheap_extract_min PARAMS ((fibheap_t));
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extern void *fibheap_min PARAMS ((fibheap_t));
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extern void *fibheap_replace_data PARAMS ((fibheap_t, fibnode_t, void *));
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extern void *fibheap_delete_node PARAMS ((fibheap_t, fibnode_t));
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extern void fibheap_delete PARAMS ((fibheap_t));
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extern fibheap_t fibheap_union PARAMS ((fibheap_t, fibheap_t));
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#endif /* _FIBHEAP_H_ */
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@ -1,3 +1,11 @@
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2001-08-20 Daniel Berlin <dan@cgsoftware.com>
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* fibheap.c: New file. Fibonacci heap.
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* Makefile.in (CFILES): Add fibheap.c.
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(REQUIRED_OFILES): Add fibheap.o.
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(fibheap.o): Add dependencies for fibheap.o.
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2001-08-20 Andrew Cagney <ac131313@redhat.com>
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* floatformat.c (floatformat_m88110_ext): Remove #ifdef
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@ -133,7 +133,7 @@ CFILES = asprintf.c alloca.c argv.c atexit.c basename.c bcmp.c bcopy.c \
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strncasecmp.c strchr.c strdup.c strerror.c strncmp.c strrchr.c \
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strsignal.c strstr.c strtod.c strtol.c strtoul.c tmpnam.c vasprintf.c \
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vfork.c vfprintf.c vprintf.c vsprintf.c waitpid.c xatexit.c xexit.c \
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xmalloc.c xmemdup.c xstrdup.c xstrerror.c ternary.c
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xmalloc.c xmemdup.c xstrdup.c xstrerror.c ternary.c fibheap.c
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# These are always included in the library.
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REQUIRED_OFILES = argv.o alloca.o choose-temp.o concat.o cplus-dem.o \
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@ -142,7 +142,7 @@ REQUIRED_OFILES = argv.o alloca.o choose-temp.o concat.o cplus-dem.o \
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md5.o make-temp-file.o objalloc.o \
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obstack.o partition.o pexecute.o regex.o safe-ctype.o sort.o spaces.o \
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splay-tree.o strerror.o strsignal.o xatexit.o xexit.o xmalloc.o \
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xmemdup.o xstrdup.o xstrerror.o ternary.o
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xmemdup.o xstrdup.o xstrerror.o ternary.o fibheap.o
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$(TARGETLIB): $(REQUIRED_OFILES) $(EXTRA_OFILES) $(LIBOBJS)
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-rm -f $(TARGETLIB)
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@ -265,6 +265,7 @@ cplus-dem.o: config.h $(INCDIR)/demangle.h
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cp-demangle.o: config.h $(INCDIR)/dyn-string.h $(INCDIR)/demangle.h
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dyn-string.o: config.h $(INCDIR)/dyn-string.h
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fdmatch.o: $(INCDIR)/libiberty.h
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fibheap.o: $(INCDIR)/libiberty.h $(INCDIR)/fibheap.h
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fnmatch.o: config.h $(INCDIR)/fnmatch.h
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getcwd.o: config.h
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getopt.o: config.h $(INCDIR)/getopt.h
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552
libiberty/fibheap.c
Normal file
552
libiberty/fibheap.c
Normal file
@ -0,0 +1,552 @@
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/* A Fibonacci heap datatype.
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Copyright 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
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Contributed by Daniel Berlin (dan@cgsoftware.com).
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* Fibonacci heaps */
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#include <limits.h>
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#include <stdlib.h>
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#include "libiberty.h"
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#include "fibheap.h"
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static void fibheap_init PARAMS ((fibheap_t));
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static void fibheap_ins_root PARAMS ((fibheap_t, fibnode_t));
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static void fibheap_rem_root PARAMS ((fibheap_t, fibnode_t));
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static void fibheap_consolidate PARAMS ((fibheap_t));
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static void fibheap_link PARAMS ((fibheap_t, fibnode_t, fibnode_t));
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static void fibheap_cut PARAMS ((fibheap_t, fibnode_t, fibnode_t));
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static void fibheap_cascading_cut PARAMS ((fibheap_t, fibnode_t));
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static fibnode_t fibheap_extr_min_node PARAMS ((fibheap_t));
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static int fibheap_compare PARAMS ((fibheap_t, fibnode_t, fibnode_t));
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static int fibheap_comp_data PARAMS ((fibheap_t, fibheapkey_t, void *, fibnode_t));
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static fibnode_t fibnode_new PARAMS ((void));
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static void fibnode_init PARAMS ((fibnode_t));
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static void fibnode_insert_after PARAMS ((fibnode_t, fibnode_t));
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#define fibnode_insert_before(a, b) fibnode_insert_after (a->left, b)
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static fibnode_t fibnode_remove PARAMS ((fibnode_t));
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/* Create a new fibonacci heap. */
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fibheap_t
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fibheap_new ()
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{
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fibheap_t result;
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if ((result = xmalloc (sizeof (*result))) == NULL)
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return NULL;
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fibheap_init (result);
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return result;
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}
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/* Initialize the passed in fibonacci heap. */
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static void
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fibheap_init (heap)
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fibheap_t heap;
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{
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heap->nodes = 0;
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heap->min = NULL;
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heap->root = NULL;
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}
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/* Insert DATA, with priority KEY, into HEAP. */
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fibnode_t
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fibheap_insert (heap, key, data)
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fibheap_t heap;
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fibheapkey_t key;
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void *data;
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{
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fibnode_t node;
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/* Create the new node, if we fail, return NULL. */
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if ((node = fibnode_new ()) == NULL)
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return NULL;
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/* Set the node's data. */
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node->data = data;
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node->key = key;
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/* Insert it into the root list. */
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fibheap_ins_root (heap, node);
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/* If their was no minimum, or this key is less than the min, it's the new
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min. */
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if (heap->min == NULL || node->key < heap->min->key)
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heap->min = node;
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heap->nodes++;
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return node;
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}
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/* Return the data of the minimum node (if we know it). */
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void *
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fibheap_min (heap)
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fibheap_t heap;
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{
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/* If there is no min, we can't easily return it. */
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if (heap->min == NULL)
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return NULL;
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return heap->min->data;
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}
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/* Return the key of the minimum node (if we know it). */
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fibheapkey_t
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fibheap_min_key (heap)
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fibheap_t heap;
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{
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/* If there is no min, we can't easily return it. */
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if (heap->min == NULL)
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return 0;
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return heap->min->key;
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}
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/* Union HEAPA and HEAPB into a new heap. */
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fibheap_t
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fibheap_union (heapa, heapb)
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fibheap_t heapa;
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fibheap_t heapb;
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{
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fibnode_t temp;
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/* If one of the heaps is empty, the union is just the other heap. */
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if (heapa->root == NULL || heapb->root == NULL)
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{
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if (heapa->root == NULL)
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{
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free (heapa);
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return heapb;
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}
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else
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{
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free (heapb);
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return heapa;
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}
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}
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/* Merge them to the next nodes on the opposite chain. */
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heapa->root->left->right = heapb->root;
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heapb->root->left->right = heapa->root;
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temp = heapa->root->left;
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heapa->root->left = heapb->root->left;
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heapb->root->left = temp;
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heapa->nodes += heapb->nodes;
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/* And set the new minimum, if it's changed. */
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if (fibheap_compare (heapa, heapb->min, heapa->min) < 0)
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heapa->min = heapb->min;
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free (heapb);
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return heapa;
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}
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/* Extract the data of the minimum node from HEAP. */
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void *
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fibheap_extract_min (heap)
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fibheap_t heap;
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{
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fibnode_t z;
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void *ret;
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ret = NULL;
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/* If we don't have a min set, it means we have no nodes. */
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if (heap->min != NULL)
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{
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/* Otherwise, extract the min node, free the node, and return the
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node's data. */
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z = fibheap_extr_min_node (heap);
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ret = z->data;
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free (z);
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}
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return ret;
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}
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/* Replace the DATA associated with NODE. */
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void *
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fibheap_replace_data (heap, node, data)
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fibheap_t heap;
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fibnode_t node;
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void *data;
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{
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return fibheap_replace_key_data (heap, node, node->key, data);
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}
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/* Replace the KEY associated with NODE. */
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fibheapkey_t
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fibheap_replace_key (heap, node, key)
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fibheap_t heap;
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fibnode_t node;
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fibheapkey_t key;
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{
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int ret;
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ret = node->key;
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(void) fibheap_replace_key_data (heap, node, key, node->data);
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return ret;
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}
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/* Replace both the KEY and the DATA associated with NODE. */
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void *
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fibheap_replace_key_data (heap, node, key, data)
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fibheap_t heap;
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fibnode_t node;
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fibheapkey_t key;
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void *data;
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{
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void *odata;
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int okey;
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fibnode_t y;
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/* If we wanted to, we could actually do a real increase by redeleting and
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inserting. However, this would require O (log n) time. So just bail out
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for now. */
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if (fibheap_comp_data (heap, key, data, node) > 0)
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return NULL;
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odata = node->data;
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okey = node->key;
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node->data = data;
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node->key = key;
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||||
y = node->parent;
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||||
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if (okey == key)
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return odata;
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||||
/* These two compares are specifically <= 0 to make sure that in the case
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of equality, a node we replaced the data on, becomes the new min. This
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is needed so that delete's call to extractmin gets the right node. */
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if (y != NULL && fibheap_compare (heap, node, y) <= 0)
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{
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||||
fibheap_cut (heap, node, y);
|
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fibheap_cascading_cut (heap, y);
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||||
}
|
||||
|
||||
if (fibheap_compare (heap, node, heap->min) <= 0)
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heap->min = node;
|
||||
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return odata;
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||||
}
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|
||||
/* Delete NODE from HEAP. */
|
||||
void *
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fibheap_delete_node (heap, node)
|
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fibheap_t heap;
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||||
fibnode_t node;
|
||||
{
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||||
void *k;
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||||
/* To perform delete, we just make it the min key, and extract. */
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||||
k = node->data;
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fibheap_replace_key (heap, node, LONG_MIN);
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fibheap_extract_min (heap);
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||||
return k;
|
||||
}
|
||||
|
||||
/* Delete HEAP. */
|
||||
void
|
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fibheap_delete (heap)
|
||||
fibheap_t heap;
|
||||
{
|
||||
while (heap->min != NULL)
|
||||
free (fibheap_extr_min_node (heap));
|
||||
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||||
free (heap);
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||||
}
|
||||
|
||||
/* Determine if HEAP is empty. */
|
||||
int
|
||||
fibheap_empty (heap)
|
||||
fibheap_t heap;
|
||||
{
|
||||
return heap->nodes == 0;
|
||||
}
|
||||
|
||||
|
||||
/* Extract the minimum node of the heap. */
|
||||
static fibnode_t
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fibheap_extr_min_node (heap)
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||||
fibheap_t heap;
|
||||
{
|
||||
fibnode_t ret;
|
||||
fibnode_t x, y, orig;
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||||
ret = heap->min;
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||||
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||||
orig = NULL;
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||||
/* Attach the child list of the minimum node to the root list of the heap.
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||||
If there is no child list, we don't do squat. */
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for (x = ret->child; x != orig && x != NULL;)
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||||
{
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||||
if (orig == NULL)
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||||
orig = x;
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||||
y = x->right;
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||||
x->parent = NULL;
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||||
fibheap_ins_root (heap, x);
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||||
x = y;
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||||
}
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||||
/* Remove the old root. */
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fibheap_rem_root (heap, ret);
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heap->nodes--;
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/* If we are left with no nodes, then the min is NULL. */
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||||
if (heap->nodes == 0)
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||||
heap->min = NULL;
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||||
else
|
||||
{
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||||
/* Otherwise, consolidate to find new minimum, as well as do the reorg
|
||||
work that needs to be done. */
|
||||
heap->min = ret->right;
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||||
fibheap_consolidate (heap);
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||||
}
|
||||
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||||
return ret;
|
||||
}
|
||||
|
||||
/* Insert NODE into the root list of HEAP. */
|
||||
static void
|
||||
fibheap_ins_root (heap, node)
|
||||
fibheap_t heap;
|
||||
fibnode_t node;
|
||||
{
|
||||
/* If the heap is currently empty, the new node becomes the singleton
|
||||
circular root list. */
|
||||
if (heap->root == NULL)
|
||||
{
|
||||
heap->root = node;
|
||||
node->left = node;
|
||||
node->right = node;
|
||||
return;
|
||||
}
|
||||
/* Otherwise, insert it in the circular root list between the root and it's
|
||||
right node. */
|
||||
fibnode_insert_after (heap->root, node);
|
||||
}
|
||||
|
||||
/* Remove NODE from the rootlist of HEAP. */
|
||||
static void
|
||||
fibheap_rem_root (heap, node)
|
||||
fibheap_t heap;
|
||||
fibnode_t node;
|
||||
{
|
||||
if (node->left == node)
|
||||
heap->root = NULL;
|
||||
else
|
||||
heap->root = fibnode_remove (node);
|
||||
}
|
||||
|
||||
/* Consolidate the heap. */
|
||||
static void
|
||||
fibheap_consolidate (heap)
|
||||
fibheap_t heap;
|
||||
{
|
||||
fibnode_t a[1 + 8 * sizeof (long)];
|
||||
fibnode_t w;
|
||||
fibnode_t y;
|
||||
fibnode_t x;
|
||||
int i;
|
||||
int d;
|
||||
int D;
|
||||
|
||||
D = 1 + 8 * sizeof (long);
|
||||
|
||||
memset (a, 0, sizeof (fibnode_t) * D);
|
||||
|
||||
while ((w = heap->root) != NULL)
|
||||
{
|
||||
x = w;
|
||||
fibheap_rem_root (heap, w);
|
||||
d = x->degree;
|
||||
while (a[d] != NULL)
|
||||
{
|
||||
y = a[d];
|
||||
if (fibheap_compare (heap, x, y) > 0)
|
||||
{
|
||||
fibnode_t temp;
|
||||
temp = x;
|
||||
x = y;
|
||||
y = temp;
|
||||
}
|
||||
fibheap_link (heap, y, x);
|
||||
a[d] = NULL;
|
||||
d++;
|
||||
}
|
||||
a[d] = x;
|
||||
}
|
||||
heap->min = NULL;
|
||||
for (i = 0; i < D; i++)
|
||||
if (a[i] != NULL)
|
||||
{
|
||||
fibheap_ins_root (heap, a[i]);
|
||||
if (heap->min == NULL || fibheap_compare (heap, a[i], heap->min) < 0)
|
||||
heap->min = a[i];
|
||||
}
|
||||
}
|
||||
|
||||
/* Make NODE a child of PARENT. */
|
||||
static void
|
||||
fibheap_link (heap, node, parent)
|
||||
fibheap_t heap ATTRIBUTE_UNUSED;
|
||||
fibnode_t node;
|
||||
fibnode_t parent;
|
||||
{
|
||||
if (parent->child == NULL)
|
||||
parent->child = node;
|
||||
else
|
||||
fibnode_insert_before (parent->child, node);
|
||||
node->parent = parent;
|
||||
parent->degree++;
|
||||
node->mark = 0;
|
||||
}
|
||||
|
||||
/* Remove NODE from PARENT's child list. */
|
||||
static void
|
||||
fibheap_cut (heap, node, parent)
|
||||
fibheap_t heap;
|
||||
fibnode_t node;
|
||||
fibnode_t parent;
|
||||
{
|
||||
fibnode_remove (node);
|
||||
parent->degree--;
|
||||
fibheap_ins_root (heap, node);
|
||||
node->parent = NULL;
|
||||
node->mark = 0;
|
||||
}
|
||||
|
||||
static void
|
||||
fibheap_cascading_cut (heap, y)
|
||||
fibheap_t heap;
|
||||
fibnode_t y;
|
||||
{
|
||||
fibnode_t z;
|
||||
|
||||
while ((z = y->parent) != NULL)
|
||||
{
|
||||
if (y->mark == 0)
|
||||
{
|
||||
y->mark = 1;
|
||||
return;
|
||||
}
|
||||
else
|
||||
{
|
||||
fibheap_cut (heap, y, z);
|
||||
y = z;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static fibnode_t
|
||||
fibnode_new ()
|
||||
{
|
||||
fibnode_t e;
|
||||
|
||||
if ((e = xmalloc (sizeof *e)) == NULL)
|
||||
return NULL;
|
||||
|
||||
fibnode_init (e);
|
||||
|
||||
return e;
|
||||
}
|
||||
|
||||
static void
|
||||
fibnode_init (node)
|
||||
fibnode_t node;
|
||||
{
|
||||
node->degree = 0;
|
||||
node->mark = 0;
|
||||
node->parent = NULL;
|
||||
node->child = NULL;
|
||||
node->left = node;
|
||||
node->right = node;
|
||||
node->data = NULL;
|
||||
}
|
||||
|
||||
static void
|
||||
fibnode_insert_after (a, b)
|
||||
fibnode_t a;
|
||||
fibnode_t b;
|
||||
{
|
||||
if (a == a->right)
|
||||
{
|
||||
a->right = b;
|
||||
a->left = b;
|
||||
b->right = a;
|
||||
b->left = a;
|
||||
}
|
||||
else
|
||||
{
|
||||
b->right = a->right;
|
||||
a->right->left = b;
|
||||
a->right = b;
|
||||
b->left = a;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static fibnode_t
|
||||
fibnode_remove (node)
|
||||
fibnode_t node;
|
||||
{
|
||||
fibnode_t ret;
|
||||
|
||||
if (node == node->left)
|
||||
ret = NULL;
|
||||
else
|
||||
ret = node->left;
|
||||
|
||||
if (node->parent != NULL && node->parent->child == node)
|
||||
node->parent->child = ret;
|
||||
|
||||
node->right->left = node->left;
|
||||
node->left->right = node->right;
|
||||
|
||||
node->parent = NULL;
|
||||
node->left = node;
|
||||
node->right = node;
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int
|
||||
fibheap_compare (heap, a, b)
|
||||
fibheap_t heap ATTRIBUTE_UNUSED;
|
||||
fibnode_t a;
|
||||
fibnode_t b;
|
||||
{
|
||||
if (a->key < b->key)
|
||||
return -1;
|
||||
if (a->key > b->key)
|
||||
return 1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
fibheap_comp_data (heap, key, data, b)
|
||||
fibheap_t heap;
|
||||
fibheapkey_t key;
|
||||
void *data;
|
||||
fibnode_t b;
|
||||
{
|
||||
struct fibnode a;
|
||||
|
||||
a.key = key;
|
||||
a.data = data;
|
||||
|
||||
return fibheap_compare (heap, &a, b);
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user