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bug#34852: 26.1; seq-intersection ignores nil as element


From: Basil L. Contovounesios
Subject: bug#34852: 26.1; seq-intersection ignores nil as element
Date: Thu, 14 Mar 2019 17:23:02 +0000
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

Attachment: bench.el
Description: application/emacs-lisp

"Basil L. Contovounesios" <address@hidden> writes:

> Michael Heerdegen <address@hidden> writes:
>
>> "Basil L. Contovounesios" <address@hidden> 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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