tree-ssa-pre.c (eliminate_dom_walker::before_dom_children): Make all defs available at the end.

2014-06-16  Richard Biener  <rguenther@suse.de>

	* tree-ssa-pre.c (eliminate_dom_walker::before_dom_children):
	Make all defs available at the end.
	(eliminate): If we remove a PHI node schedule cfg-cleanup.

From-SVN: r211698

gcc/ChangeLog

+2014-06-16  Richard Biener  <rguenther@suse.de>
+
+	* tree-ssa-pre.c (eliminate_dom_walker::before_dom_children):
+	Make all defs available at the end.
+	(eliminate): If we remove a PHI node schedule cfg-cleanup.
+
 2014-06-18  Jakub Jelinek  <jakub@redhat.com>
 
 	PR plugins/45078
@@ -11,7 +17,8 @@
 
 2014-06-15  Jan Hubicka  <hubicka@ucw.cz>
 
-	* c-family/c-common.c (handle_tls_model_attribute): Use set_decl_tls_model.
+	* c-family/c-common.c (handle_tls_model_attribute): Use
+	set_decl_tls_model.
 	* cgraph.h (struct varpool_node): Add tls_model.
 	* tree.c (decl_tls_model, set_decl_tls_model): New functions.
 	* tree.h (DECL_TLS_MODEL): Update.

gcc/tree-ssa-pre.c

@@ -4188,7 +4188,6 @@ eliminate_dom_walker::before_dom_children (basic_block b)
 				   b->loop_father->num);
 			}
 		      /* Don't keep sprime available.  */
-		      eliminate_push_avail (lhs);
 		      sprime = NULL_TREE;
 		    }
 		}
@@ -4433,10 +4432,11 @@ eliminate_dom_walker::before_dom_children (basic_block b)
 	    VN_INFO (vdef)->valnum = vuse;
 	}
 
-      /* Make the new value available - for fully redundant LHS we
-         continue with the next stmt above.  */
-      if (lhs && TREE_CODE (lhs) == SSA_NAME)
-	eliminate_push_avail (lhs);
+      /* Make new values available - for fully redundant LHS we
+         continue with the next stmt above and skip this.  */
+      def_operand_p defp;
+      FOR_EACH_SSA_DEF_OPERAND (defp, stmt, iter, SSA_OP_DEF)
+	eliminate_push_avail (DEF_FROM_PTR (defp));
     }
 
   /* Replace destination PHI arguments.  */
@@ -4521,7 +4521,11 @@ eliminate (bool do_pre)
 
       gsi = gsi_for_stmt (stmt);
       if (gimple_code (stmt) == GIMPLE_PHI)
+	{
 	  remove_phi_node (&gsi, true);
+	  /* Removing a PHI node in a block may expose a forwarder block.  */
+	  el_todo |= TODO_cleanup_cfg;
+	}
       else
 	{
 	  basic_block bb = gimple_bb (stmt);