[Bug middle-end/32667] builtin operator= generates memcpy with overlapping memory regions

[rguenth at gcc dot gnu dot org]

------- Comment #3 from rguenth at gcc dot gnu dot org  2007-07-08 19:46 -------
No, this doesn't have anything to do with aliasing.  4.3 simply inlines the
memcpys.  This is probably a middle-end issue with expanding structure
assignments.  2.95 and 3.3 also expanded the calls inline.  3.4 does not,
likewise 4.0, 4.1 and 4.2.

Note that this is likely not a problem in practice as memcpy (p, p, sizeof
(*p))
is difficult to implement in a way that would make it not work.  So,
downgrading
severity.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rguenth at gcc dot gnu dot
                   |                            |org
           Severity|major                       |normal
             Status|UNCONFIRMED                 |NEW
          Component|c++                         |middle-end
     Ever Confirmed|0                           |1
           Keywords|                            |wrong-code
   Last reconfirmed|0000-00-00 00:00:00         |2007-07-08 19:46:19
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32667