[Bug c++/33887] [4.2/4.3 Regression] Reference to bitfield gets wrong value when optimizing

[rguenth at gcc dot gnu dot org]

------- Comment #8 from rguenth at gcc dot gnu dot org  2007-12-11 13:08 -------
Which is because

  if (lang_hooks.reduce_bit_field_operations
      && TREE_CODE (type) == INTEGER_TYPE
      && GET_MODE_PRECISION (mode) > TYPE_PRECISION (type))
    {
      /* An operation in what may be a bit-field type needs the 
         result to be reduced to the precision of the bit-field type,
         which is narrower than that of the type's mode.  */
      reduce_bit_field = true;
      if (modifier == EXPAND_STACK_PARM)
        target = 0;
    }

so this becomes a frontend bug again, because none but c-objc-common.h sets
that langhook to true.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|middle-end                  |c++


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33887