[Bug fortran/51218] [4.7 Regression] Potential optimization bug

[kargl at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51218

kargl at gcc dot gnu.org changed:

           What    |Removed                     |Added
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                 CC|                            |kargl at gcc dot gnu.org

--- Comment #4 from kargl at gcc dot gnu.org 2011-11-19 00:40:49 UTC ---
(In reply to comment #3)
> The miscompilation is triggered by -ffrontend-optimize, work-around: use
> -fno-frontend-optimize.
> Revision 171653 is dealing with the frontend optimization. If I am not
> mistaken, it is the only change dealing with frontend optimization after
> r171100, although I don't understand how this revision could cause a
> miscompilation.
> 
> The crash occurs in __mo_dec_matrix_MOD_sum_vector.

Looks like a bug in the application, but the interesting
coding style makes it hard for me to read.  If one removes

    call delete_storage (x)

in sum_vector the problem goes away.  That is, it looks like
over-active memory management hidden beneath a layer of 
obfusication.