[Bug fortran/51267] loop optimization error using LOC function

[tkoenig at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51267

Thomas Koenig <tkoenig at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |tkoenig at gcc dot gnu.org
         Resolution|                            |INVALID

--- Comment #10 from Thomas Koenig <tkoenig at gcc dot gnu.org> 2012-05-01 09:45:54 UTC ---
(In reply to comment #9)
> Is there any progress with this? The issue persists with gcc 4.7.0 final and
> the workaround with -fno-tree-dse stopped working.

The test case violates the standard.  The compiler knows that the array
tab cannot be accessed in a legal way, and that the stores into array
ius are not used later.  Therefore, they are removed.

This part of Fortran semantics allows a lot of optimizations, and we
will not make other programs slower to accommodate this non-standard
usage. 

So, your best bet is to simulate dynamic memory some other way, for
example by handing out parts of a COMMON block, or use F90+ memory
management.

Your second best bet is to compile all relevant code parts with -O0,
and keep your fingers crossed that it keeps on working.  This is likely,
but not guaranteed.

Closing as invalid.