From: Alan Mackenzie <acm@muc.de>
To: Eli Zaretskii <eliz@gnu.org>
Cc: emacs-devel@gnu.org
Subject: Re: Correct byte compiler error/warning positions. The solution!
Date: Sat, 27 Nov 2021 10:33:07 +0000 [thread overview]
Message-ID: <YaIJY1ctav4jyIk0@ACM> (raw)
In-Reply-To: <8335nh29pt.fsf@gnu.org>
Hello, Eli.
On Sat, Nov 27, 2021 at 12:07:10 +0200, Eli Zaretskii wrote:
> > Date: Sat, 27 Nov 2021 09:31:05 +0000
> > Cc: emacs-devel@gnu.org
> > From: Alan Mackenzie <acm@muc.de>
> > Hello, Eli.
> > On Sat, Nov 27, 2021 at 07:53:36 +0200, Eli Zaretskii wrote:
> > > > Date: Fri, 26 Nov 2021 19:56:21 +0000
> > > > From: Alan Mackenzie <acm@muc.de>
> > > > A _LOT_ of these comparisons were for NILP, which is just #defined as EQ
> > > > (arg, Qnil). However if NILP were to be defined directly as arg ==
> > > > Qnil, it would bypass the overhead in EQ.
> > > How can you use == when the operands could be structures?
> > I meant that NILP will be implemented as a binary comparison against
> > zero, omitting the awkward test for symbols_with_position_enabled.
> Please don't write code that assumes Qnil is zero. (Or maybe I still
> misunderstand what exactly you mean by the above.)
Don't worry! The new code merely assumes Qnil is a symbol, and leaves it
to the compiler to optimise for Qnil being binary zero.
--
Alan Mackenzie (Nuremberg, Germany).
next prev parent reply other threads:[~2021-11-27 10:33 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-26 19:56 Correct byte compiler error/warning positions. The solution! Alan Mackenzie
2021-11-27 5:53 ` Eli Zaretskii
2021-11-27 9:31 ` Alan Mackenzie
2021-11-27 10:07 ` Eli Zaretskii
2021-11-27 10:33 ` Alan Mackenzie [this message]
2021-11-27 10:51 ` Eli Zaretskii
2021-11-27 23:05 ` Alan Mackenzie
2021-11-28 7:25 ` Eli Zaretskii
2021-11-29 11:50 ` Alan Mackenzie
2021-11-29 12:45 ` Eli Zaretskii
2021-11-29 19:39 ` Alan Mackenzie
2021-12-01 15:58 ` Alan Mackenzie
2021-12-01 16:49 ` Eli Zaretskii
2021-12-01 16:58 ` Alan Mackenzie
2021-12-01 17:04 ` Lars Ingebrigtsen
2021-12-01 17:21 ` Alan Mackenzie
2021-12-01 17:38 ` Lars Ingebrigtsen
2021-12-01 20:28 ` Alan Mackenzie
2021-12-01 17:08 ` Eli Zaretskii
2021-12-01 17:12 ` Alan Mackenzie
2021-12-01 17:53 ` Andrea Corallo
2021-12-01 17:57 ` Eli Zaretskii
2021-12-02 11:21 ` Alan Mackenzie
2021-12-02 16:31 ` Andrea Corallo
2021-12-02 20:35 ` Alan Mackenzie
2021-12-03 21:05 ` Alan Mackenzie
2021-12-04 19:22 ` Andrea Corallo
2021-12-04 19:39 ` Eli Zaretskii
2021-12-04 19:55 ` Andrea Corallo
2021-12-04 19:58 ` Eli Zaretskii
2021-12-04 20:06 ` Andrea Corallo
2021-12-14 14:29 ` Alan Mackenzie
2021-12-15 9:33 ` Andrea Corallo
2021-12-17 11:54 ` Alan Mackenzie
2021-12-20 8:24 ` Andrea Corallo
2021-12-21 17:48 ` Alan Mackenzie
2021-11-29 13:24 ` Robert Pluim
2021-11-29 19:16 ` Alan Mackenzie
2021-11-30 9:52 ` Robert Pluim
2021-11-28 20:15 ` Andrea Corallo
2021-12-01 16:18 ` Andrea Corallo
2021-12-01 16:46 ` Alan Mackenzie
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