From: Stefan Monnier <monnier@iro.umontreal.ca>
To: help-gnu-emacs@gnu.org
Subject: Re: Sharp--quote [was: url-retrieve fails on most HTTPS sites]
Date: Tue, 29 Sep 2020 10:56:56 -0400 [thread overview]
Message-ID: <jwva6x8vdqp.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: 20200929141421.GA13194@tuxteam.de
>> > Plus lots of other optimizations the compiler can do if it knows
>> > that it's the function value you are talking about.
>> Yeah, you have an example of this?
> I think Stefan is in a far better position to answer that.
AFAIK there is no optimization that applies specifically to #'foo :-(
There's really not much opportunity for optimization there, since all it
says is "use the function found in the `symbol-function` slot *at the time
we actually call it*". But whatever we know about the content of
`symbol-value` during compilation may not hold anymore by the time the
code is executed.
So the differences w.r.t 'foo are limited to:
- Tell the *human reader* that the intention here is to refer to
a function of that name.
- Get a warning from the compiler if the function doesn't seem to exist.
- Plus the special case of `cl-flet` and `cl-labels` where the #' is
needed to refer to the locally-defined function.
Stefan
next prev parent reply other threads:[~2020-09-29 14:56 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-28 20:41 url-retrieve fails on most HTTPS sites Nicolas Graner
2020-09-28 23:13 ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-09-28 23:24 ` 2QdxY4RzWzUUiLuE
2020-09-28 23:41 ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-09-29 2:26 ` Stefan Monnier
2020-09-29 3:24 ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-09-29 9:31 ` tomas
2020-09-29 9:49 ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-09-29 10:32 ` tomas
2020-09-29 10:50 ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-09-29 14:14 ` Sharp--quote [was: url-retrieve fails on most HTTPS sites] tomas
2020-09-29 14:56 ` Stefan Monnier [this message]
2020-09-29 15:19 ` tomas
2020-09-29 16:03 ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-09-29 16:01 ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-09-29 15:18 ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-09-29 3:45 ` url-retrieve fails on most HTTPS sites 황병희
2020-09-29 2:50 ` 2QdxY4RzWzUUiLuE
2020-09-29 5:45 ` Colin Baxter
2020-09-29 11:29 ` 2QdxY4RzWzUUiLuE
2020-09-29 13:57 ` Colin Baxter
2020-09-29 14:53 ` HTTPS fails (was: url-retrieve fails on most HTTPS sites) Nicolas Graner
2020-09-29 15:10 ` Nicolas Graner
2020-09-29 15:16 ` Gregory Heytings via Users list for the GNU Emacs text editor
2020-09-29 14:47 ` url-retrieve fails on most HTTPS sites Noam Postavsky
2020-09-29 15:08 ` Nicolas Graner
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