[Bug middle-end/38431] [graphite] several ICEs with CP2K (summary)

["jv244 at cam dot ac dot uk" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #32 from jv244 at cam dot ac dot uk  2009-01-14 06:49 -------
(In reply to comment #30)
> Subject: Re:  [graphite] several ICEs with CP2K (summary)
> 
> Thanks for the clarification, I managed to reproduce the fail.  The
> problem comes from the fact that we do not generate code for a scalar
> reduction that is not detected as a scalar reduction with the variable
> connection$dim$1$lbound.
> 
> In the attached output from debug_loops (3) I selected the region of
> code containing both the original loops: loop_3 and loop_4 and the
> code generated by graphite with -fgraphite-identity: loop_22, loop_23.
> 
> In loop_22 the computation on connection$dim$1$lbound disappears.
> I wonder what this variable stands for: it is not used elsewhere in the
> debug_loops (3) output of change_bond_length function, and I suspect
> that this is a global variable whose value is needed elsewhere outside
> the change_bond_length function.
>

This variable is a local, I believe, it is part of the array descriptor of the
(local variable):
INTEGER, ALLOCATABLE, DIMENSION(:, :)    :: connection


> The bug is in the detection of scalar reductions.
> 
> Sebastian
> 


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38431