re PR tree-optimization/30159 (gcc.c-torture/execute/20010422-1.c is miscompiled)

2006-12-12  Andrew Macleod  <amacleod@redhat.com>

	PR tree-optimization/30159
	* tree-ssa-coalesce.c (coalesce_ssa_name): Process single ssa_name 
	functions in case a default_def coalesce is required.

From-SVN: r119792

gcc/ChangeLog

+2006-12-12  Andrew Macleod  <amacleod@redhat.com>
+	
+	PR tree-optimization/30159
+	* tree-ssa-coalesce.c (coalesce_ssa_name): Process single ssa_name 
+	functions in case a default_def coalesce is required.
+
 2006-12-12  Jakub Jelinek  <jakub@redhat.com>
 
 	PR libstdc++/11953

gcc/tree-ssa-coalesce.c

@@ -1284,7 +1284,7 @@ coalesce_ssa_name (void)
   partition_view_bitmap (map, used_in_copies, true);
   BITMAP_FREE (used_in_copies);
 
-  if (num_var_partitions (map) <= 1)
+  if (num_var_partitions (map) < 1)
     {
       delete_coalesce_list (cl);
       return map;