[Bug bootstrap/14322] Unrecognizable lo_sum insn with -m64 and -fPIC

["ebotcazou at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From ebotcazou at gcc dot gnu dot org  2004-03-15 13:14 -------
Ok, so let's put aside the cc1 problem on mainline and requalify the bug as a
bootstrap failure on tree-ssa.

However, the only way I can think of to produce

  (symbol_ref:SI ("foo"))

with -m64, which is invalid according to the manual

     The `symbol_ref' contains a mode, which is usually `Pmode'.
     Usually that is the only mode for which a symbol is directly valid.

because Pmode == DImode with -m64 in all cases, is to pass -mptr32 to cc1.


On mainline, the problem comes from these lines in convert_memory_address:

    case SYMBOL_REF:
      temp = shallow_copy_rtx (x);
      PUT_MODE (temp, to_mode);
      return temp;
      break;

which appears to go against the manual.  But this can't happen on mainline
through the compiler driver since all 64-bit SPARC ports in the FSF tree are
LP64 and, therefore, pass -mptr64 to cc1.


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |critical
          Component|target                      |bootstrap
           Keywords|accepts-invalid             |ice-on-valid-code
      Known to fail|tree-ssa 3.5.0              |tree-ssa
           Priority|P2                          |P1
            Version|3.5.0                       |tree-ssa


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14322