From: Eli Zaretskii <eliz@gnu.org>
To: Andrea Corallo <acorallo@gnu.org>
Cc: pipcet@protonmail.com, emacs-devel@gnu.org
Subject: Re: __builtin_expect
Date: Fri, 29 Nov 2024 09:19:55 +0200 [thread overview]
Message-ID: <861pyucxr8.fsf@gnu.org> (raw)
In-Reply-To: <yp1o71zgi3a.fsf@fencepost.gnu.org> (message from Andrea Corallo on Thu, 28 Nov 2024 16:32:25 -0500)
> From: Andrea Corallo <acorallo@gnu.org>
> Cc: Emacs Devel <emacs-devel@gnu.org>
> Date: Thu, 28 Nov 2024 16:32:25 -0500
>
> > You said that your assumption holds "when we are not compiling", but your code change applies to the other case, too.
>
> Indeed, but Emacs is rarely compiling, Emacs is not primary a compiler,
> and I hope it's clear that we want to optimize for its everyday typical
> use. Given in that case 'syms_with_pos_enabled' is simply false all the
> time, this is just the way to express that to the compiler so it can
> generate the right code.
I agree.
> Actually AFAIU/R the presence of 'syms_with_pos_enabled' there *is* an
> optimization to mitigate the performance impact of this feature on the
> most common Emacs usecase (the one my patch optimized further).
Right.
prev parent reply other threads:[~2024-11-29 7:19 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-11-28 15:45 __builtin_expect (was: Re: master b0ba0d42b0f: * src/lisp.h (EQ): Improve generated code.) Pip Cet via Emacs development discussions.
2024-11-28 16:12 ` __builtin_expect Andrea Corallo
2024-11-28 20:29 ` __builtin_expect Pip Cet via Emacs development discussions.
2024-11-28 21:32 ` __builtin_expect Andrea Corallo
2024-11-28 22:06 ` __builtin_expect Pip Cet via Emacs development discussions.
2024-11-29 7:19 ` Eli Zaretskii [this message]
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