[Bug middle-end/14084] Reg allocator changes REG_EXPR

["pinskia at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-02-09 16:49 -------
Confirmed then, the variable tracking has to do a better job as this is correct because otherwise it will 
cause wrong code to change the reg allocator not to do this as values in the register are stored no 
matter what in the widess form, see:
/* Define this macro if it is advisable to hold scalars in registers
   in a wider mode than that declared by the program.  In such cases,
   the value is constrained to be within the bounds of the declared
   type, but kept valid in the wider mode.  The signedness of the
   extension may differ from that of the type.  */

#define PROMOTE_MODE(MODE,UNSIGNEDP,TYPE)       \
  if (GET_MODE_CLASS (MODE) == MODE_INT         \
      && GET_MODE_SIZE (MODE) < UNITS_PER_WORD) \
    (MODE) = TARGET_32BIT ? SImode : DImode;

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2004-02-09 16:49:51
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14084