From: Florian Weimer <fweimer@redhat.com>
To: Szabolcs Nagy via Libc-alpha <libc-alpha@sourceware.org>
Cc: "naohirot@fujitsu.com" <naohirot@fujitsu.com>,
Szabolcs Nagy <Szabolcs.Nagy@arm.com>,
'Wilco Dijkstra' <Wilco.Dijkstra@arm.com>
Subject: Re: [PATCH 0/5] Added optimized memcpy/memmove/memset for A64FX
Date: Thu, 06 May 2021 17:09:19 +0200 [thread overview]
Message-ID: <875yzvhpb4.fsf@oldenburg.str.redhat.com> (raw)
In-Reply-To: <20210506142658.GA9028@arm.com> (Szabolcs Nagy via Libc-alpha's message of "Thu, 6 May 2021 15:26:59 +0100")
* Szabolcs Nagy via Libc-alpha:
> this means a64fx implemented hint space instructions
> (such as bti c) slower than plain nops, which is not
> expected and will cause slowdowns with distros that
> try to distribute binaries with bti c, this problem
> goes beyond string functions.
And we are using -mbranch-protection=standard on AArch64 going forward,
for example:
| optflags: aarch64 %{__global_compiler_flags} -mbranch-protection=standard -fasynchronous-unwind-tables %[ "%{toolchain}" == "gcc" ? "-fstack-clash-protection" : "" ]
<https://gitlab.com/redhat/centos-stream/rpms/redhat-rpm-config/-/blob/c9s/rpmrc#L77>
(Fedora is similar.
This is why I find this issue so worrying.
Thanks,
Florian
next prev parent reply other threads:[~2021-05-06 15:09 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-12 12:52 Wilco Dijkstra
2021-04-12 18:53 ` Florian Weimer
2021-04-13 12:07 ` naohirot
2021-04-14 16:02 ` Wilco Dijkstra
2021-04-15 12:20 ` naohirot
2021-04-20 16:00 ` Wilco Dijkstra
2021-04-27 11:58 ` naohirot
2021-04-29 15:13 ` Wilco Dijkstra
2021-04-30 15:01 ` Szabolcs Nagy
2021-04-30 15:23 ` Wilco Dijkstra
2021-04-30 15:30 ` Florian Weimer
2021-04-30 15:40 ` Wilco Dijkstra
2021-05-04 7:56 ` Szabolcs Nagy
2021-05-04 10:17 ` Florian Weimer
2021-05-04 10:38 ` Wilco Dijkstra
2021-05-04 10:42 ` Szabolcs Nagy
2021-05-04 11:07 ` Florian Weimer
2021-05-06 10:01 ` naohirot
2021-05-06 14:26 ` Szabolcs Nagy
2021-05-06 15:09 ` Florian Weimer [this message]
2021-05-06 17:31 ` Wilco Dijkstra
2021-05-07 12:31 ` naohirot
2021-04-19 2:51 ` naohirot
2021-04-19 14:57 ` Wilco Dijkstra
2021-04-21 10:10 ` naohirot
2021-04-21 15:02 ` Wilco Dijkstra
2021-04-22 13:17 ` naohirot
2021-04-23 0:58 ` naohirot
2021-04-19 12:43 ` naohirot
2021-04-20 3:31 ` naohirot
2021-04-20 14:44 ` Wilco Dijkstra
2021-04-27 9:01 ` naohirot
2021-04-20 5:49 ` naohirot
2021-04-20 11:39 ` Wilco Dijkstra
2021-04-27 11:03 ` naohirot
2021-04-23 13:22 ` naohirot
-- strict thread matches above, loose matches on Subject: below --
2021-03-17 2:28 Naohiro Tamura
2021-03-29 12:03 ` Szabolcs Nagy
2021-05-10 1:45 ` naohirot
2021-05-14 13:35 ` Szabolcs Nagy
2021-05-19 0:11 ` naohirot
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