GNU bug report logs - #34852
26.1; seq-intersection ignores nil as element

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Message #53 received at 34852 <at> debbugs.gnu.org (full text, mbox):

From: "Basil L. Contovounesios" <contovob <at> tcd.ie>
To: Michael Heerdegen <michael_heerdegen <at> web.de>
Cc: Nicolas Petton <nicolas <at> petton.fr>, 34852 <at> debbugs.gnu.org,
 Stefan Monnier <monnier <at> iro.umontreal.ca>,
 "Miguel V. S. Frasson" <mvsfrasson <at> gmail.com>
Subject: Re: bug#34852: 26.1; seq-intersection ignores nil as element
Date: Thu, 14 Mar 2019 17:23:02 +0000

[bench.el (application/emacs-lisp, attachment)]

[Message part 2 (text/plain, inline)]

"Basil L. Contovounesios" <contovob <at> tcd.ie> writes:

> Michael Heerdegen <michael_heerdegen <at> web.de> writes:
>
>> "Basil L. Contovounesios" <contovob <at> tcd.ie> writes:
>>
>>> My first patch makes an analogous backward-compatible change using the
>>> more efficient seq-position in place of seq-some.
>>
>> Why is it more efficient?  The implementations are more or less
>> analogue, with the exception that seq-position additionally increments a
>> counter.
>
> Because seq-some involves an additional level of function indirection.
> This is confirmed by profiling and the attached mini-benchmark, when run
> as follows:
>
> emacs -batch -f batch-byte-compile bench.el
> emacs -script bench.elc

Oops, forgot to attach.

-- 
Basil

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