From: Leo Famulari <leo@famulari.name>
To: "Ludovic Courtès" <ludo@gnu.org>
Cc: 24703@debbugs.gnu.org
Subject: bug#24703: Store references in 8-byte chunks in compiled code
Date: Sat, 5 Nov 2016 14:36:50 -0400 [thread overview]
Message-ID: <20161105183650.GA21301@jasmine> (raw)
In-Reply-To: <87a8de7s6q.fsf@inria.fr>
On Sat, Nov 05, 2016 at 12:15:25AM +0100, Ludovic Courtès wrote:
> I’ve fiddled a bit with GCC and read some code. No success yet, but
> here’s a status update.
Thanks for writing this out!
> Instead, the knobs we have are (1) global flag to enable/disable each
> built-in function (like -fno-builtin-… does), and (2) an x86-specific
> knob to determine whether to use ‘movabs’ or not (‘-mmemcpy-strategy’
> supposedly controls that, but ‘-mmemcpy-strategy=libcall:-1:noalign’
> doesn’t seem to have any effect for instance.)
Please correct me if I paraphrase the choices incorrectly:
(1) Completely disable the strcpy optimization for all architectures
(2) Ostensibly change how strcpy is optimized on x86, except the knob
seems to have no effect
> These knobs are not great because that would lead us to disable the
> optimization wholesale, which is not desirable.
What are the costs of (1)? Should we report (2) upstream?
next prev parent reply other threads:[~2016-11-05 18:37 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-16 3:49 bug#24703: fontconfig keeps obfuscated reference to itself, not grafted Mark H Weaver
2016-10-16 4:26 ` Mark H Weaver
2016-10-16 5:00 ` Mark H Weaver
2016-10-16 6:24 ` bug#24703: Store references in 8-byte chunks in compiled code Mark H Weaver
2016-10-16 9:03 ` Mark H Weaver
2016-10-16 9:25 ` Mark H Weaver
2016-10-16 10:15 ` Mark H Weaver
2016-10-16 19:04 ` Ludovic Courtès
2016-10-17 7:46 ` bug#24703: " Török Edwin
2016-10-17 9:42 ` Mark H Weaver
2016-10-17 12:09 ` Ludovic Courtès
2016-10-18 3:36 ` Mark H Weaver
2016-10-18 8:59 ` Ludovic Courtès
2016-10-31 6:35 ` Mark H Weaver
2016-10-31 11:37 ` Ludovic Courtès
2016-10-24 19:40 ` Leo Famulari
2016-10-24 20:18 ` Ludovic Courtès
2016-11-04 23:15 ` Ludovic Courtès
2016-11-05 18:36 ` Leo Famulari [this message]
2016-11-06 20:58 ` Ludovic Courtès
2016-11-09 20:40 ` Ludovic Courtès
2016-11-09 23:16 ` Leo Famulari
2016-11-10 8:01 ` Ludovic Courtès
2017-04-02 22:19 ` Ludovic Courtès
2016-11-11 10:39 ` Ludovic Courtès
2016-10-19 21:25 ` Török Edwin
2016-10-20 12:25 ` Ludovic Courtès
2016-10-16 14:42 ` bug#24703: fontconfig keeps obfuscated reference to itself, not grafted Ludovic Courtès
2016-10-16 15:06 ` Ludovic Courtès
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