tree-ssa-dom.c (thread_across_edge): Remove broken code to avoid threading into a loop.

        * tree-ssa-dom.c (thread_across_edge): Remove broken code to
        avoid threading into a loop.

From-SVN: r92666

gcc/ChangeLog

+2004-12-27  Jeff Law  <law@redhat.com>
+
+	* tree-ssa-dom.c (thread_across_edge): Remove broken code to
+	avoid threading into a loop.
+
 2004-12-27  Richard Henderson  <rth@redhat.com>
 
 	PR target/17406

gcc/tree-ssa-dom.c

@@ -686,22 +686,6 @@ thread_across_edge (struct dom_walk_data *walk_data, edge e)
 	  || TREE_CODE (stmt) == SWITCH_EXPR))
     {
       tree cond, cached_lhs;
-      edge e1;
-      edge_iterator ei;
-
-      /* Do not forward entry edges into the loop.  In the case loop
-	 has multiple entry edges we may end up in constructing irreducible
-	 region.  
-	 ??? We may consider forwarding the edges in the case all incoming
-	 edges forward to the same destination block.  */
-      if (!e->flags & EDGE_DFS_BACK)
-	{
-	  FOR_EACH_EDGE (e1, ei, e->dest->preds)
-	    if (e1->flags & EDGE_DFS_BACK)
-	      break;
-	  if (e1)
-	    return;
-	}
 
       /* Now temporarily cprop the operands and try to find the resulting
 	 expression in the hash tables.  */