2009-10-19  Alexandre Oliva  <aoliva@redhat.com>

	* tree-ssa-dce.c (eliminate_unnecessary_stmts): Don't regard
	the removal of a debug stmt as a significant change.

--- gcc/tree-ssa-dce.c.orig	2009-10-19 12:29:56.000000000 -0200
+++ gcc/tree-ssa-dce.c	2009-10-19 12:30:36.000000000 -0200
@@ -1129,8 +1129,9 @@ eliminate_unnecessary_stmts (void)
 	  /* If GSI is not necessary then remove it.  */
 	  if (!gimple_plf (stmt, STMT_NECESSARY))
 	    {
+	      if (!is_gimple_debug (stmt))
+		something_changed = true;
 	      remove_dead_stmt (&gsi, bb);
-	      something_changed = true;
 	    }
 	  else if (is_gimple_call (stmt))
 	    {