From: Stefan Monnier <monnier@iro.umontreal.ca>
To: "Mattias Engdegård" <mattiase@acm.org>
Cc: emacs-devel@gnu.org
Subject: Re: master 68c09c6: Better CPS conversion of multi-binding `let`
Date: Tue, 30 Nov 2021 08:42:50 -0500 [thread overview]
Message-ID: <jwvwnkpkbis.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <D0370F76-6AFC-4D7C-84F4-C385D89FB83E@acm.org> ("Mattias Engdegård"'s message of "Tue, 30 Nov 2021 14:30:43 +0100")
>> I think this optimization can be generalized to the multi-var case by
>> noticing that the transformation of (vN eN) into a pair (tN eN) ... (vN tN)
>> is not necessary because the order of the (v1 t1) ... (vN tN) doesn't matter
>> so we can move (vN tN) to the beginning, right next to (tN eN) and then
>> merge them back.
>
> Not sure how that would work unless you imply some kind of dependency
> analysis. Maybe you have an example in mind?
No dependency analysis needed, just always turn
(let ((x1 e1) ... (xN eN))
BODY)
into
(let* ((t1 e1) ... (tN-1 eN-1) (xN eN) (x1 t1) .. (xN-1 tN-1))
BODY)
-- Stefan
next prev parent reply other threads:[~2021-11-30 13:42 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20211130120404.23495.29099@vcs0.savannah.gnu.org>
[not found] ` <20211130120405.6C5F4209FD@vcs0.savannah.gnu.org>
2021-11-30 13:19 ` master 68c09c6: Better CPS conversion of multi-binding `let` Stefan Monnier
2021-11-30 13:30 ` Mattias Engdegård
2021-11-30 13:42 ` Stefan Monnier [this message]
2021-11-30 13:49 ` Mattias Engdegård
2021-11-30 13:54 ` Stefan Monnier
2021-11-30 14:11 ` Mattias Engdegård
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