From: Emanuel Berg <incal@dataswamp.org>
To: help-gnu-emacs@gnu.org
Subject: Re: Emacs 30.0 warning from `cl-pushnew' and `memql'
Date: Sun, 08 Jan 2023 05:18:51 +0100 [thread overview]
Message-ID: <878ridacb8.fsf@dataswamp.org> (raw)
In-Reply-To: jwvtu1drgi2.fsf-monnier+emacs@gnu.org
Stefan Monnier via Users list for the GNU Emacs text editor wrote:
>> (let ((lst '()))
>> (cl-pushnew "a" lst)
>> (cl-pushnew "a" lst)
>> lst) ; ("a" "a")
>
> It may sometimes return ("a" "a") but it may also return
> ("a"). Case in point, I think it will do the first when
> interpreted and the second when compiled.
What's the deal with all that, can it be explained easily?
Why is it different?
That's not a good thing, right? I always thought of compiled
as just faster in execution, but computes faster ...
The compiler has some optimization scheme with recurring data
in space and time so the same data ends up at the same place
so is just pushed once?
--
underground experts united
https://dataswamp.org/~incal
next prev parent reply other threads:[~2023-01-08 4:18 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-26 20:38 Emacs 30.0 warning from `cl-pushnew' and `memql' Emanuel Berg
2022-12-27 6:56 ` Jean Louis
2022-12-27 10:28 ` Michael Heerdegen
2022-12-27 11:33 ` Emanuel Berg
2022-12-27 11:39 ` Emanuel Berg
2022-12-28 3:23 ` [External] : " Drew Adams
2022-12-28 4:23 ` Emanuel Berg
2022-12-29 22:27 ` Drew Adams
2022-12-30 22:27 ` Emanuel Berg
2022-12-30 6:30 ` tomas
2022-12-28 6:25 ` tomas
2022-12-28 11:59 ` Michael Heerdegen
2022-12-28 12:41 ` tomas
2022-12-28 12:45 ` Emanuel Berg
2022-12-28 13:19 ` Emanuel Berg
2022-12-28 14:54 ` Emanuel Berg
2022-12-29 22:31 ` Stefan Monnier via Users list for the GNU Emacs text editor
2023-01-08 4:18 ` Emanuel Berg [this message]
2023-01-08 18:54 ` Andreas Eder
2022-12-28 17:57 ` [External] : " Drew Adams
2022-12-28 18:10 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-12-28 19:29 ` Emanuel Berg
2022-12-28 19:35 ` Drew Adams
2022-12-28 19:36 ` tomas
2022-12-28 19:24 ` Emanuel Berg
2022-12-28 17:54 ` Drew Adams
2022-12-28 18:05 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-12-28 19:35 ` Drew Adams
2022-12-29 3:34 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-12-29 19:06 ` Drew Adams
2022-12-29 19:45 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-12-29 22:00 ` Drew Adams
2022-12-29 22:25 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-12-30 7:29 ` Drew Adams
2022-12-30 18:55 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-12-30 22:55 ` Drew Adams
2022-12-31 0:08 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-12-31 2:45 ` Drew Adams
2022-12-31 4:53 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-12-28 19:21 ` Emanuel Berg
2022-12-28 20:24 ` Jean Louis
2022-12-28 20:56 ` Emanuel Berg
2022-12-28 21:24 ` [External] : " Drew Adams
2022-12-28 22:47 ` Jean Louis
2022-12-28 23:48 ` Emanuel Berg
2022-12-29 6:03 ` tomas
2022-12-29 6:59 ` Emanuel Berg
2022-12-29 7:08 ` Emanuel Berg
2022-12-29 7:19 ` Emanuel Berg
2022-12-29 22:41 ` Drew Adams
2022-12-30 23:03 ` Emanuel Berg
2022-12-30 6:35 ` tomas
2022-12-29 9:18 ` Jean Louis
2022-12-29 10:04 ` Emanuel Berg
2022-12-29 10:12 ` tomas
2022-12-29 10:20 ` Emanuel Berg
2022-12-29 10:26 ` Emanuel Berg
2022-12-29 10:36 ` Michael Heerdegen
2022-12-29 14:47 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-12-29 10:39 ` Michael Heerdegen
2022-12-28 12:44 ` Emanuel Berg
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