Index: gcc/expr.c
===================================================================
--- gcc/expr.c	2012-10-23 19:37:49.000000000 +0100
+++ gcc/expr.c	2012-10-25 09:36:33.071286674 +0100
@@ -1464,11 +1464,11 @@ emit_block_move_via_loop (rtx x, rtx y,
   emit_label (top_label);
 
   tmp = convert_modes (x_addr_mode, iter_mode, iter, true);
-  x_addr = gen_rtx_PLUS (x_addr_mode, x_addr, tmp);
+  x_addr = simplify_gen_binary (PLUS, x_addr_mode, x_addr, tmp);
 
   if (x_addr_mode != y_addr_mode)
     tmp = convert_modes (y_addr_mode, iter_mode, iter, true);
-  y_addr = gen_rtx_PLUS (y_addr_mode, y_addr, tmp);
+  y_addr = simplify_gen_binary (PLUS, y_addr_mode, y_addr, tmp);
 
   x = change_address (x, QImode, x_addr);
   y = change_address (y, QImode, y_addr);