From: Jakub Jelinek <jakub@redhat.com>
To: Florian Weimer <fweimer@redhat.com>
Cc: "Carlos O'Donell" <carlos@redhat.com>,
John David Anglin <dave.anglin@bell.net>,
Jason Merrill <jason@redhat.com>,
Bernd Edlinger <bernd.edlinger@hotmail.de>,
"gcc-patches@gcc.gnu.org" <gcc-patches@gcc.gnu.org>,
Jeff Law <law@redhat.com>
Subject: Re: [PATCH] Implement new hook for max_align_t_align
Date: Wed, 12 Oct 2016 08:02:00 -0000 [thread overview]
Message-ID: <20161012080208.GK7282@tucnak.redhat.com> (raw)
In-Reply-To: <ad86356d-db0e-58dc-a7e0-5603130c4bca@redhat.com>
On Wed, Oct 12, 2016 at 09:52:04AM +0200, Florian Weimer wrote:
> dropping the alignment means that the padding before the lock member
> vanishes. Consequently, we have just created a silent ABI change in
> application code, which is a big no-no.
Sure, it would be an ABI change, but how many users would it affect?
> Since this is PA-RISC, which is essentially dead (neither HPE nor Debian
> ship it anymore), I stand by my suggestion to bump the fundamental alignment
Or just drop support for a dead arch?
> instead. Sure, it is a bit inefficient, but this will only affect PA-RISC
> users. It does not even cause work for PA-RISC porters. Conversely, if we
> work on this to come up with a different fix, many more people will be
> affected (because they don't get all the nice things we could work on
> instead), and we may need to maintain a special GCC kludge for the
> alternative solution, impacting GCC developers in particular.
But sure, bumping malloc alignment is probably easiest. And people who want
performance have better options than to stay on 32-bit PA-RISC anyway.
Jakub
next prev parent reply other threads:[~2016-10-12 8:02 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-08 17:01 Bernd Edlinger
2016-10-08 17:36 ` John David Anglin
2016-10-09 8:35 ` Bernd Edlinger
2016-10-09 17:52 ` John David Anglin
2016-10-10 18:21 ` John David Anglin
2016-10-11 18:51 ` Jason Merrill
2016-10-11 18:59 ` DJ Delorie
2016-10-11 20:12 ` Jason Merrill
2016-10-11 20:55 ` John David Anglin
2016-10-11 20:57 ` Jakub Jelinek
2016-10-11 21:27 ` Jason Merrill
2016-10-11 20:04 ` John David Anglin
2016-10-12 7:02 ` Carlos O'Donell
2016-10-12 7:25 ` Jakub Jelinek
2016-10-12 7:52 ` Florian Weimer
2016-10-12 8:02 ` Jakub Jelinek [this message]
2016-10-12 12:13 ` John David Anglin
2016-10-12 12:33 ` Bernd Schmidt
2016-10-12 12:43 ` Richard Biener
2016-10-12 12:46 ` Bernd Schmidt
2016-10-12 15:51 ` Joseph Myers
2016-10-12 13:48 ` Jason Merrill
2016-10-12 14:17 ` John David Anglin
2016-10-12 19:59 ` Carlos O'Donell
2016-10-12 16:14 ` Jeff Law
2016-10-12 17:24 ` John David Anglin
2017-02-25 17:46 ` Gerald Pfeifer
2017-02-25 22:13 ` John David Anglin
2017-02-25 22:46 ` Gerald Pfeifer
2017-02-25 23:46 ` John David Anglin
2016-10-12 18:01 ` Florian Weimer
2016-10-12 18:13 ` John David Anglin
-- strict thread matches above, loose matches on Subject: below --
2016-10-08 16:43 Bernd Edlinger
2016-10-08 15:45 John David Anglin
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