[Bug c++/49519] [4.7 Regression] Revision 175272 miscompiled 447.dealII in SPEC CPU 2006

[kirill.yukhin at intel dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49519

--- Comment #8 from Yukhin Kirill <kirill.yukhin at intel dot com> 2011-06-30 
15:26:36 UTC ---
If someone really need a quick fix, it may be done like this:
gcc/expor.s:

  static bool
  mem_overlaps_already_clobbered_arg_p (rtx addr, unsigned HOST_WIDE_INT size)
  {
    HOST_WIDE_INT i;

    if (addr == crtl->args.internal_arg_pointer)
      i = 0;
    else if (GET_CODE (addr) == PLUS
             && XEXP (addr, 0) == crtl->args.internal_arg_pointer
             && CONST_INT_P (XEXP (addr, 1)))
      i = INTVAL (XEXP (addr, 1));
    /* Return true for arg pointer based indexed addressing.  */
    else if (GET_CODE (addr) == PLUS
             && (XEXP (addr, 0) == crtl->args.internal_arg_pointer
                 || XEXP (addr, 1) == crtl->args.internal_arg_pointer))
      else if (GET_CODE(addr) == REG)   <-----------
        return true;
      else
        return false;

But we possibly will be to conservative doing so