From: Matthias Kretz <m.kretz@gsi.de>
To: Jonathan Wakely <jwakely.gcc@gmail.com>
Cc: Jonathan Wakely <jwakely@redhat.com>,
"Richard Earnshaw (lists)" <Richard.Earnshaw@arm.com>,
libstdc++ <libstdc++@gcc.gnu.org>,
gcc-patches List <gcc-patches@gcc.gnu.org>,
GNU C Library <libc-alpha@sourceware.org>,
Jason Merrill <jason@redhat.com>
Subject: Re: [PATCH] c++: implement C++17 hardware interference size
Date: Sat, 17 Jul 2021 15:54:53 +0200 [thread overview]
Message-ID: <90365047.B8guWdUDZo@excalibur> (raw)
In-Reply-To: <CAH6eHdSnd6C_xQtkQSiU6mUZFdnsjLd5Syejcu-uUvj95Jcpdw@mail.gmail.com>
On Saturday, 17 July 2021 15:32:42 CEST Jonathan Wakely wrote:
> On Sat, 17 Jul 2021, 09:15 Matthias Kretz, <m.kretz@gsi.de> wrote:
> > If somebody writes a library with `keep_apart` in the public API/ABI then
> > you're right.
>
> Yes, it's fine if those constants don't affect anything across module
> boundaries.
I believe a significant fraction of hardware interference size usage will be
internal.
> > The developer who wants his code to be included in a distro should care
> > about
> > binary distribution. If his code has an ABI issue, that's a bug he needs
> > to
> > fix. It's not the fault of the packager.
>
> Yes but in practice it's the packagers who have to deal with the bug
> reports, analyze the problem, and often fix the bug too. It might not be
> the packager's fault but it's often their problem
I can imagine. But I don't think requiring users to specify the value
according to what -mtune suggests will improve things. Users will write a
configure/cmake/... macro to parse the value -mtune prints and pass that on
the command line (we'll soon find this solution on SO 😜). I.e. things are
likely to be even more broken.
--
──────────────────────────────────────────────────────────────────────────
Dr. Matthias Kretz https://mattkretz.github.io
GSI Helmholtz Centre for Heavy Ion Research https://gsi.de
std::experimental::simd https://github.com/VcDevel/std-simd
──────────────────────────────────────────────────────────────────────────
next prev parent reply other threads:[~2021-07-17 13:55 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20210716023656.670004-1-jason@redhat.com>
2021-07-16 2:41 ` Jason Merrill
2021-07-16 2:48 ` Noah Goldstein
2021-07-16 11:17 ` Jonathan Wakely
2021-07-16 13:27 ` Richard Earnshaw
2021-07-16 13:26 ` Jonathan Wakely
2021-07-16 15:12 ` Matthias Kretz
2021-07-16 15:30 ` Jason Merrill
2021-07-16 16:54 ` Jonathan Wakely
2021-07-16 18:43 ` Jason Merrill
2021-07-16 19:26 ` Matthias Kretz
2021-07-16 19:58 ` Jonathan Wakely
2021-07-17 8:14 ` Matthias Kretz
2021-07-17 13:32 ` Jonathan Wakely
2021-07-17 13:54 ` Matthias Kretz [this message]
2021-07-17 21:37 ` Jason Merrill
2021-07-19 9:41 ` Richard Earnshaw
2021-07-20 16:43 ` Jason Merrill
2021-07-20 18:05 ` Thomas Rodgers
2021-07-16 17:20 ` Noah Goldstein
2021-07-16 19:37 ` Matthias Kretz
2021-07-16 21:23 ` Noah Goldstein
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