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From: Andrea Corallo <acorallo@gnu.org>
To: emacs-devel@gnu.org
Cc: Paul Eggert <eggert@cs.ucla.edu>
Subject: Re: master 8c81818673a 6/7: Tune volatile in read_char
Date: Sat, 17 Aug 2024 11:04:18 -0400	[thread overview]
Message-ID: <yp1wmkffax9.fsf@fencepost.gnu.org> (raw)
In-Reply-To: <20240817041648.A6687C2BC66@vcs2.savannah.gnu.org> (Paul Eggert's message of "Sat, 17 Aug 2024 00:16:47 -0400 (EDT)")

Paul Eggert <eggert@cs.ucla.edu> writes:

> branch: master
> commit 8c81818673ae9ff788c6e65fb90984f327b27964
> Author: Paul Eggert <eggert@cs.ucla.edu>
> Commit: Paul Eggert <eggert@cs.ucla.edu>
>
>     Tune volatile in read_char
>     
>     * src/keyboard.c (read_char): Optimize access to a local volatile.

Hi Paul,

this change building with "--enable-checking=all
--enable-check-lisp-object-type" on my system (GCC 14
x86_64-pc-linux-gnu) is introducing:

"keyboard.c:2520:15: warning: variable ‘c’ might be clobbered by ‘longjmp’ or ‘vfork’ [-Wclobbered]"

Also wanted to ask, is this a performance optimization?

  Andrea



       reply	other threads:[~2024-08-17 15:04 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <172386820621.30556.15409337288904485218@vcs2.savannah.gnu.org>
     [not found] ` <20240817041648.A6687C2BC66@vcs2.savannah.gnu.org>
2024-08-17 15:04   ` Andrea Corallo [this message]
2024-08-17 17:03     ` master 8c81818673a 6/7: Tune volatile in read_char Pip Cet
2024-08-17 18:16       ` Paul Eggert
2024-08-17 18:17     ` Paul Eggert
2024-08-18  7:39       ` Andrea Corallo
2024-08-18 21:39         ` Paul Eggert
2024-08-18 21:57           ` Sam James
2024-08-18 22:03             ` Paul Eggert
2024-08-19 14:43           ` Andrea Corallo
2024-08-19 15:01             ` Eli Zaretskii
2024-08-19 15:32               ` Pip Cet
2024-08-19 15:44                 ` Eli Zaretskii
2024-08-19 16:01                   ` Pip Cet
2024-08-19 16:15                     ` Eli Zaretskii
2024-08-19 18:59                       ` Paul Eggert
2024-08-19 19:27                         ` Eli Zaretskii
2024-08-19 19:05                       ` Pip Cet
2024-08-19 19:29                         ` Eli Zaretskii
2024-08-19 19:43                           ` Paul Eggert
2024-08-19 20:08                             ` Pip Cet
2024-08-19 22:20                               ` Paul Eggert
2024-08-19 23:40                                 ` Pip Cet

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