Index: gcc/expmed.c
===================================================================
--- gcc/expmed.c	2012-11-20 09:55:26.000000000 +0000
+++ gcc/expmed.c	2012-11-20 17:24:09.722871322 +0000
@@ -645,7 +645,7 @@ store_bit_field_1 (rtx str_rtx, unsigned
     if (imode != GET_MODE (op0))
       {
 	if (MEM_P (op0))
-	  op0 = adjust_bitfield_address (op0, imode, 0);
+	  op0 = adjust_bitfield_address_size (op0, imode, 0, MEM_SIZE (op0));
 	else
 	  {
 	    gcc_assert (imode != BLKmode);
@@ -1380,7 +1380,7 @@ extract_bit_field_1 (rtx str_rtx, unsign
     if (imode != GET_MODE (op0))
       {
 	if (MEM_P (op0))
-	  op0 = adjust_bitfield_address (op0, imode, 0);
+	  op0 = adjust_bitfield_address_size (op0, imode, 0, MEM_SIZE (op0));
 	else if (imode != BLKmode)
 	  {
 	    op0 = gen_lowpart (imode, op0);
@@ -1403,10 +1403,10 @@ extract_bit_field_1 (rtx str_rtx, unsign
 	  }
 	else
 	  {
-	    rtx mem = assign_stack_temp (GET_MODE (op0),
-					 GET_MODE_SIZE (GET_MODE (op0)));
+	    HOST_WIDE_INT size = GET_MODE_SIZE (GET_MODE (op0));
+	    rtx mem = assign_stack_temp (GET_MODE (op0), size);
 	    emit_move_insn (mem, op0);
-	    op0 = adjust_bitfield_address (mem, BLKmode, 0);
+	    op0 = adjust_bitfield_address_size (mem, BLKmode, 0, size);
 	  }
       }
   }