--- gcc/expr.c.jj	2013-10-31 14:57:05.000000000 +0100
+++ gcc/expr.c	2013-11-06 14:48:59.095970841 +0100
@@ -4756,8 +4756,6 @@ expand_assignment (tree to, tree from, b
 	  if (GET_MODE (offset_rtx) != address_mode)
 	    offset_rtx = convert_to_mode (address_mode, offset_rtx, 0);
 
-	  /* A constant address in TO_RTX can have VOIDmode, we must not try
-	     to call force_reg for that case.  Avoid that case.  */
 	  if (MEM_P (to_rtx)
 	      && GET_MODE (to_rtx) == BLKmode
 	      && GET_MODE (XEXP (to_rtx, 0)) != VOIDmode
@@ -4767,6 +4765,9 @@ expand_assignment (tree to, tree from, b
 	      && MEM_ALIGN (to_rtx) == GET_MODE_ALIGNMENT (mode1))
 	    {
 	      to_rtx = adjust_address (to_rtx, mode1, bitpos / BITS_PER_UNIT);
+	      bitregion_start = 0;
+	      if (bitregion_end >= (unsigned HOST_WIDE_INT) bitpos)
+		bitregion_end -= bitpos;
 	      bitpos = 0;
 	    }
 
@@ -9926,8 +9927,6 @@ expand_expr_real_1 (tree exp, rtx target
 	      offset_rtx = convert_to_mode (address_mode, offset_rtx, 0);
 
 	    if (GET_MODE (op0) == BLKmode
-		/* A constant address in OP0 can have VOIDmode, we must
-		   not try to call force_reg in that case.  */
 		&& GET_MODE (XEXP (op0, 0)) != VOIDmode
 		&& bitsize != 0
 		&& (bitpos % bitsize) == 0