From: Thomas Schwinge <thomas@codesourcery.com>
To: Jakub Jelinek <jakub@redhat.com>
Cc: "Thomas König" <tk@tkoenig.net>,
"fortran@gcc.gnu.org" <fortran@gcc.gnu.org>,
gcc-patches <gcc-patches@gcc.gnu.org>,
vries@gcc.gnu.org
Subject: Re: PR85463 '[nvptx] "exit" in offloaded region doesn't terminate process' (was: [patch, libfortran, committed] Implement stop_numeric for minimal targets)
Date: Thu, 19 Apr 2018 09:36:00 -0000 [thread overview]
Message-ID: <87in8nbkrq.fsf@hertz.schwinge.homeip.net> (raw)
In-Reply-To: <20180419092530.GY8577@tucnak>
Hi!
On Thu, 19 Apr 2018 11:25:30 +0200, Jakub Jelinek <jakub@redhat.com> wrote:
> On Thu, Apr 19, 2018 at 11:19:31AM +0200, Thomas Schwinge wrote:
> > On Thu, 19 Apr 2018 11:14:38 +0200, Jakub Jelinek <jakub@redhat.com> wrote:
> > > On Thu, Apr 19, 2018 at 11:06:18AM +0200, Thomas Schwinge wrote:
> > > > On Wed, 4 Apr 2018 11:30:34 +0200, Thomas König <tk@tkoenig.net> wrote:
> > > > > the recent patch to make the gfortran and libgomp testsuites more
> > > > > standard conforming, by replacing CALL ABORT() with STOP N, led
> > > > > to numerous testsuite failures on nvptx because stop_numeric
> > > > > was not implemented in minimal.c.
> > > > >
> > > > > I have committed the patch below in r259072 as obvious after Tom
> > > > > de Vries had confirmed that it solves the problem.
> > > >
> > > > ... for some meaning of "solves the problem"; see below. ;-) Which you
> > > > couldn't know, of course. (So, definitely thanks anyway, for promptly
> > > > addressing the issue raised!)
> > >
> > > My preference would be just to revert the call abort to stop n changes
> > > in target regions.
> >
> > That seems backwards to me -- having "exit" (as well as Fortran language
> > "stop" and "error stop") inside offloaded regions do the right thing is
> > something we wanted to do anyway, eventually.
>
> I'm looking for a GCC8 fix, and for that it seems like the simplest
> and safest solution.
As far as I know, the "call abort to stop n" changes regressed nvptx
targets only, and that's now fixed (and improved to handle more Fortran
language "stop" and "error stop" variants), so I don't see a reason to
iterate once again? (Or, why didn't you then already dispute Thomas
König's nvptx/libgfortran minimal.c patch adding stop_numeric?)
> > > Mapping exit to abort is weird
> >
> > Sure, that's why PR85463 is still open, and has some (initial)
> > comments/ideas regarding that.
> >
> > > and making exit terminate whole process even
> > > when called from offloaded regions might be too expensive.
> >
> > In what way "too expensive"?
>
> If you need to add code to handle that case to every target region entry
> just in case something does stop, the slow down might be too high and
> unacceptable. Depends on how it is implemented.
Right, but that's again "why PR85463 is still open, and has some
(initial) comments/ideas regarding that", and no overhead has so far been
introduced.
Grüße
Thomas
next prev parent reply other threads:[~2018-04-19 9:36 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-04 9:30 [patch, libfortran, committed] Implement stop_numeric for minimal targets Thomas König
2018-04-19 9:06 ` PR85463 '[nvptx] "exit" in offloaded region doesn't terminate process' (was: [patch, libfortran, committed] Implement stop_numeric for minimal targets) Thomas Schwinge
2018-04-19 9:36 ` Jakub Jelinek
2018-04-19 9:19 ` Thomas Schwinge
2018-04-19 9:25 ` Jakub Jelinek
2018-04-19 9:36 ` Thomas Schwinge [this message]
2018-04-19 11:32 ` Thomas König
2018-04-19 11:59 ` Thomas Schwinge
2018-04-19 17:59 ` PR85463 '[nvptx] "exit" in offloaded region doesn't terminate process' Thomas König
2018-04-25 13:56 ` PR85463 '[nvptx] "exit" in offloaded region doesn't terminate process' (was: [patch, libfortran, committed] Implement stop_numeric for minimal targets) Martin Jambor
2018-04-26 10:47 ` PR85463 '[nvptx] "exit" in offloaded region doesn't terminate process' Thomas Schwinge
2018-04-26 12:39 ` Martin Jambor
[not found] ` <20230119220005.2002779-1-thomas@codesourcery.com>
2023-01-20 20:12 ` Clean up after newlib "nvptx: In offloading execution, map '_exit' to 'abort' [GCC PR85463]" Thomas Schwinge
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