[Bug middle-end/105638] Redundant stores aren't removed by DSE

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105638

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2022-05-18
     Ever confirmed|0                           |1
           Keywords|                            |missed-optimization

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
DSE doesn't remove redundant stores, in some cases it can prune an earlier
store but that's only handled in a limited set of cases.  The issue with
removing redundant stores is that side-effects on the effective dynamic type
have to be preserved so removing earlier stores is much better.