[Bug tree-optimization/91091] [missed optimization] Missing optimization in unaliased pointers

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91091

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2019-07-05
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Note that GCC middle-end semantics would allow partial overlaps here unless
you factor in alignment requirements.

There is actually code in GCC9+ that is supposed to handle this situation but
for some reason it doesn't work here.  I'll see why.