* Re: emacs-27 9ab85f0 1/3: Fix cl-concatenate (Bug#40180)
[not found] ` <20200323031345.272D320E43@vcs0.savannah.gnu.org>
@ 2020-03-23 13:31 ` Stefan Monnier
2020-03-23 13:57 ` Noam Postavsky
0 siblings, 1 reply; 3+ messages in thread
From: Stefan Monnier @ 2020-03-23 13:31 UTC (permalink / raw)
To: emacs-devel; +Cc: Noam Postavsky
> (defun cl-concatenate (type &rest sequences)
> "Concatenate, into a sequence of type TYPE, the argument SEQUENCEs.
> \n(fn TYPE SEQUENCE...)"
> - (seq-concatenate type sequences))
> + (apply #'seq-concatenate type sequences))
A `defalias` would be significantly more efficient, no?
Stefan
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: emacs-27 9ab85f0 1/3: Fix cl-concatenate (Bug#40180)
2020-03-23 13:31 ` emacs-27 9ab85f0 1/3: Fix cl-concatenate (Bug#40180) Stefan Monnier
@ 2020-03-23 13:57 ` Noam Postavsky
2020-03-23 23:02 ` Noam Postavsky
0 siblings, 1 reply; 3+ messages in thread
From: Noam Postavsky @ 2020-03-23 13:57 UTC (permalink / raw)
To: Stefan Monnier; +Cc: Emacs developers
On Mon, 23 Mar 2020 at 09:31, Stefan Monnier <monnier@iro.umontreal.ca> wrote:
>
> > (defun cl-concatenate (type &rest sequences)
> > "Concatenate, into a sequence of type TYPE, the argument SEQUENCEs.
> > \n(fn TYPE SEQUENCE...)"
> > - (seq-concatenate type sequences))
> > + (apply #'seq-concatenate type sequences))
>
> A `defalias` would be significantly more efficient, no?
Looks like it saves some garbage, yes.
(defconst a '(1 2 3))
(benchmark-run-compiled 100000 (cl-concatenate 'list a a))
(1.224929595 32 1.3378226840000025)
(1.2353714580000001 32 1.3444626560000046)
(1.231527913 32 1.355576149000001)
(defalias 'cl-concatenate-a 'seq-concatenate)
(benchmark-run-compiled 100000 (cl-concatenate-a 'list a a))
(1.040019167 28 1.1824459620000027)
(1.038810077 28 1.1772625320000003)
(1.039655252 28 1.1828426319999892)
^ permalink raw reply [flat|nested] 3+ messages in thread
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[not found] ` <20200323031345.272D320E43@vcs0.savannah.gnu.org>
2020-03-23 13:31 ` emacs-27 9ab85f0 1/3: Fix cl-concatenate (Bug#40180) Stefan Monnier
2020-03-23 13:57 ` Noam Postavsky
2020-03-23 23:02 ` Noam Postavsky
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