[Bug middle-end/56098] [4.6/4.7/4.8 Regression] conditional write through volatile pointer produces unintended read

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56098

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-01-25
                 CC|                            |matz at gcc dot gnu.org
   Target Milestone|---                         |4.6.4
            Summary|conditional write through   |[4.6/4.7/4.8 Regression]
                   |volatile pointer produces   |conditional write through
                   |unintended read             |volatile pointer produces
                   |                            |unintended read
     Ever Confirmed|0                           |1

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> 2013-01-25 14:42:43 UTC ---
This is cselim at work, preparing the way for if-conversion of the store ...

It shouldn't do this for volatiles of course.

Workaround: -fno-tree-cselim