From: Steve Kargl <sgk@troutmask.apl.washington.edu>
To: Thomas Koenig <tkoenig@netcologne.de>
Cc: "fortran@gcc.gnu.org" <fortran@gcc.gnu.org>,
gcc-patches <gcc-patches@gcc.gnu.org>
Subject: Re: [patch, fortran] PR 84487
Date: Sat, 28 Sep 2019 16:53:00 -0000 [thread overview]
Message-ID: <20190928165318.GB15489@troutmask.apl.washington.edu> (raw)
In-Reply-To: <23849d2b-9339-95d8-8589-f9fdea4b8e9e@netcologne.de>
On Wed, Sep 25, 2019 at 10:24:51PM +0200, Thomas Koenig wrote:
>
> this patch makes sure that the __def_init variables, which have been
> generated for normal allocatable arrays for quite some time, do not fill
> up huge amounts of space in the object files with zeros. This is done by
> not marking them read-only, which means that they are put into the BSS.
>
> Setting DECL_ARTIFICIAL on the __def_init variable makes sure it
> is handled as predetermined shared in gfc_omp_predetermined_sharing .
>
> This is not an optimum solution. As the xfail shows, we are now missing
> out on an optimization (as seen by the xfail that is now needed), and
> having large all-zero variables seems wrong. However, this patch solves
> the most urgent problem in this respect.
>
> This is an 8/9/10 regression, so I would like to commit this to
> all of these branches (waiting before gcc 9 reopens, of course).
>
> I wold then close the PR and open an enchancement PR for the xfail
> and the design improvement.
>
> Test case... I'm not sure what to test for.
>
> Regression-tested. OK for all affected branches?
>
Your approach seems reasonable to me. You may want to
ping Jakub or Tobias as this affects openmp.
--
Steve
next prev parent reply other threads:[~2019-09-28 16:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-25 20:24 Thomas Koenig
2019-09-28 16:53 ` Steve Kargl [this message]
2019-09-29 22:20 ` Thomas Koenig
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