[Bug middle-end/48016] New: Inconsistency in non-local goto save area

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48016

           Summary: Inconsistency in non-local goto save area
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: hjl.tools@gmail.com


We have

void
emit_stack_save (enum save_level save_level, rtx *psave)
{
  rtx sa = *psave;
  /* The default is that we use a move insn and save in a Pmode object.  */
  rtx (*fcn) (rtx, rtx) = gen_move_insn;
  enum machine_mode mode = STACK_SAVEAREA_MODE (save_level);
....

void
update_nonlocal_goto_save_area (void)
{
  tree t_save;
  rtx r_save;

  /* The nonlocal_goto_save_area object is an array of N pointers.  The
     first one is used for the frame pointer save; the rest are sized by
     STACK_SAVEAREA_MODE.  Create a reference to array index 1, the first
     of the stack save area slots.  */
  t_save = build4 (ARRAY_REF, ptr_type_node, cfun->nonlocal_goto_save_area,
                   integer_one_node, NULL_TREE, NULL_TREE);
  r_save = expand_expr (t_save, NULL_RTX, VOIDmode, EXPAND_WRITE);

  emit_stack_save (SAVE_NONLOCAL, &r_save);
}

The mode of PSAVE passed to emit_stack_save is the mode of
ptr_type_node, which may not be STACK_SAVEAREA_MODE which
is expected by emit_stack_save.