* Re: master 1ecd350 2/2: Evaluate some unnecessarily quoted lambdas
[not found] ` <20200621124629.C414420A26@vcs0.savannah.gnu.org>
@ 2020-06-21 16:18 ` Stefan Monnier
2020-06-21 18:08 ` Basil L. Contovounesios
0 siblings, 1 reply; 2+ messages in thread
From: Stefan Monnier @ 2020-06-21 16:18 UTC (permalink / raw
To: emacs-devel; +Cc: Basil L. Contovounesios
> - (lambda-code (byte-compile '(lambda ()))))
> + (lambda-code (byte-compile (lambda ()))))
I can't believe I'm doing that, but: this hunk is wrong!
`byte-compile` takes source code as input, not values. It does go to
the trouble of trying to handle the case where we pass it a function
value that's not yet compiled because it's an important use-case in
practice, but it's better to avoid it since the above means that we'll
first turn '(lambda () ()) into a closure object which `byte-compile`
then has to convert back to something like (lambda () ()).
Stefan
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: master 1ecd350 2/2: Evaluate some unnecessarily quoted lambdas
2020-06-21 16:18 ` master 1ecd350 2/2: Evaluate some unnecessarily quoted lambdas Stefan Monnier
@ 2020-06-21 18:08 ` Basil L. Contovounesios
0 siblings, 0 replies; 2+ messages in thread
From: Basil L. Contovounesios @ 2020-06-21 18:08 UTC (permalink / raw
To: Stefan Monnier; +Cc: emacs-devel
Stefan Monnier <monnier@iro.umontreal.ca> writes:
>> - (lambda-code (byte-compile '(lambda ()))))
>> + (lambda-code (byte-compile (lambda ()))))
>
> I can't believe I'm doing that, but: this hunk is wrong!
>
> `byte-compile` takes source code as input, not values. It does go to
> the trouble of trying to handle the case where we pass it a function
> value that's not yet compiled because it's an important use-case in
> practice,
(Also it's advertised in its docstring.)
> but it's better to avoid it since the above means that we'll
> first turn '(lambda () ()) into a closure object which `byte-compile`
> then has to convert back to something like (lambda () ()).
Ah okay. I admit the main reason I thought the hunk was okay is because
(byte-compile (lambda ())) and (byte-compile '(lambda ())) produce the
same byte-code.
Thanks for catching that, now reverted.
Revert last change in benchmark.el
0792f8e4f0 2020-06-21 19:01:40 +0100
https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=0792f8e4f0de2328c57d552a5845bdf77265a971
--
Basil
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[not found] ` <20200621124629.C414420A26@vcs0.savannah.gnu.org>
2020-06-21 16:18 ` master 1ecd350 2/2: Evaluate some unnecessarily quoted lambdas Stefan Monnier
2020-06-21 18:08 ` Basil L. Contovounesios
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