re PR tree-optimization/21849 (wrong use of sbitmap in tree-ssa-copy.c)

	PR tree-optimization/21849
	* tree-ssa-copy.c (dump_copy_of): Call sbitmap_zero.

From-SVN: r100531

gcc/ChangeLog

+2005-06-03  Kazu Hirata  <kazu@codesourcery.com>
+
+	PR tree-optimization/21849
+	* tree-ssa-copy.c (dump_copy_of): Call sbitmap_zero.
+
 2005-06-02  Richard Henderson  <rth@redhat.com>
 
 	* Makefile.in (tree-vect-generic.o): New.

gcc/tree-ssa-copy.c

@@ -482,6 +482,7 @@ dump_copy_of (FILE *dump_file, tree var)
     return;
     
   visited = sbitmap_alloc (num_ssa_names);
+  sbitmap_zero (visited);
   SET_BIT (visited, SSA_NAME_VERSION (var));
   
   fprintf (dump_file, " copy-of chain: ");