[Bug middle-end/47727] [x32] Many passes can't handle const symbol when Pmode != ptr_mode

["hjl.tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47727

--- Comment #8 from H.J. Lu <hjl.tools at gmail dot com> 2011-02-14 17:24:56 UTC ---
The problem may be in convert_memory_address_addr_space:

    case PLUS:
    case MULT:
      /* For addition we can safely permute the conversion and addition
         operation if one operand is a constant and converting the constant
         does not change it or if one operand is a constant and we are
         using a ptr_extend instruction  (POINTERS_EXTEND_UNSIGNED < 0).
         We can always safely permute them if we are making the address
         narrower.  */
      if (GET_MODE_SIZE (to_mode) < GET_MODE_SIZE (from_mode)
          || (GET_CODE (x) == PLUS 
              && CONST_INT_P (XEXP (x, 1))
              && (XEXP (x, 1) == convert_memory_address_addr_space
                                   (to_mode, XEXP (x, 1), as)
                 || POINTERS_EXTEND_UNSIGNED < 0))) 
        return gen_rtx_fmt_ee (GET_CODE (x), to_mode,
                               convert_memory_address_addr_space
                                 (to_mode, XEXP (x, 0), as), 
                               XEXP (x, 1)); 


It will generate new instructions for

(plus:SI (symbol_ref:SI ("__CTOR_END__") [flags 0x2] <var_decl 0x7ffff0cf0000
__CTOR_END__>)
    (const_int -4 [0xfffffffffffffffc]))

since 

(const_int -4 [0xfffffffffffffffc])

is converted to

(const_int 4294967292 [0xfffffffc])