------- Comment #2 from paul dot richard dot thomas at gmail dot com
2010-08-09 10:50 -------
Subject: Re: Segmentation fault with -fwhole-file for
subref_array_pointer
Dear Tobias,
> If one now recycles the definition for the array descriptor "desc" this
> information is not present. I think the real solution is the new array
> descriptor. I do not know how to fix this otherwise - except by always
> generating a span variable.
This has occurred to me more than once!
>
> Paul - any progress from the array-descriptor front?
Yes, I made a small start whilst on vacation. I have embarked on the
first step of the project, which is to add to the existing dimension
triplet the stride measure (sm) and extent fields. On top of that, I
added an extra field to the descriptor itself, which does nothing but
uncover all the accesses to the descriptor fields that do not use the
ABI in trans-array.c. I just reached the stage of plugging all the
segfaults arising from the latter. The next step is to evaluate the
sm and extent fields, in parallel to the stride and upper fields, just
to check all is well. Then will come the crucial step of using the
new fields for evaluation of array references. I suspect that there
will be a substantial performance hit in the scalarizer and problems
with the library, both of which will require time to fix. Then, the
stride and upper fields can be taken away. Finally, all the extra
fields can be added to the descriptor.
I will have some time to work on this next week.
Cheers
Paul
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45128
