*** /tmp/4OxbwE_expr.c	2012-04-05 17:08:53.618103685 +0200
--- gcc/expr.c	2012-04-03 16:47:31.362229047 +0200
*************** convert_move (rtx to, rtx from, int unsi
*** 522,531 ****
        /* No special multiword conversion insn; do it by hand.  */
        start_sequence ();
  
!       /* Since we will turn this into a no conflict block, we must ensure
! 	 that the source does not overlap the target.  */
  
!       if (reg_overlap_mentioned_p (to, from))
  	from = force_reg (from_mode, from);
  
        /* Get a copy of FROM widened to a word, if necessary.  */
--- 522,534 ----
        /* No special multiword conversion insn; do it by hand.  */
        start_sequence ();
  
!       /* Since we will turn this into a no conflict block, we must ensure the
!          the source does not overlap the target so force it into an isolated
!          register when maybe so.  Likewise for any MEM input, since the
!          conversion sequence might require several references to it and we
!          must ensure we're getting the same value every time.  */
  
!       if (MEM_P (from) || reg_overlap_mentioned_p (to, from))
  	from = force_reg (from_mode, from);
  
        /* Get a copy of FROM widened to a word, if necessary.  */