[Bug rtl-optimization/40924] [4.4 Regression] miscompiles with -03 (seemingly related to attribute may_alias)

[rguenth at gcc dot gnu dot org]

------- Comment #2 from rguenth at gcc dot gnu dot org  2009-07-31 11:14 -------
Confirmed.  Trunk works for me.

If I disable gcse the testcase is no longer miscompiled (likewise if I
disable tree PRE which only hoists some conversions - thus likely const/copy
propagation goes wrong or addresses are improperly rewritten).  The RTL
after expansion looks sane wrt alias sets.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
          Component|middle-end                  |rtl-optimization
     Ever Confirmed|0                           |1
           Keywords|                            |alias, wrong-code
      Known to fail|                            |4.4.1
      Known to work|                            |4.4.0 4.5.0
   Last reconfirmed|0000-00-00 00:00:00         |2009-07-31 11:14:45
               date|                            |
            Summary|4.4.1 regression:           |[4.4 Regression] miscompiles
                   |miscompiles with -03        |with -03 (seemingly related
                   |(seemingly related to       |to attribute may_alias)
                   |attribute may_alias)        |
   Target Milestone|---                         |4.4.2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40924