tree-cfg.c (tree_merge_blocks): Preserve loop exit phi nodes only in loop closed ssa.

	* tree-cfg.c (tree_merge_blocks): Preserve loop exit phi nodes only
	in loop closed ssa.

From-SVN: r127119

gcc/ChangeLog

 2007-08-01  Zdenek Dvorak  <ook@ucw.cz>
 
+	* tree-cfg.c (tree_merge_blocks): Preserve loop exit phi nodes only
+	in loop closed ssa.
+
+2007-08-01  Zdenek Dvorak  <ook@ucw.cz>
+
 	* tree-ssa-threadupdate.c (thread_through_all_blocks): Record that
 	the loop structures may need fixing.
 	* tree-cfgcleanup.c (cleanup_tree_cfg_noloop, repair_loop_structures):

gcc/tree-cfg.c

@@ -1274,9 +1274,10 @@ tree_merge_blocks (basic_block a, basic_block b)
       tree copy;
       bool may_replace_uses = may_propagate_copy (def, use);
 
-      /* In case we have loops to care about, do not propagate arguments of
-	 loop closed ssa phi nodes.  */
+      /* In case we maintain loop closed ssa form, do not propagate arguments
+	 of loop exit phi nodes.  */
       if (current_loops
+	  && (current_loops->state & LOOP_CLOSED_SSA)
 	  && is_gimple_reg (def)
 	  && TREE_CODE (use) == SSA_NAME
 	  && a->loop_father != b->loop_father)