GNU bug report logs - #42147
28.0.50; pure vs side-effect-free, missing optimizations?

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Package: emacs;

Reported by: Andrea Corallo <andrea_corallo <at> yahoo.it>

Date: Tue, 30 Jun 2020 22:28:02 UTC

Severity: normal

Found in version 28.0.50

Done: Mattias Engdegård <mattiase <at> acm.org>

Bug is archived. No further changes may be made.

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Philipp Stephani <p.stephani2 <at> gmail.com>
Cc: Mattias Engdegård <mattiase <at> acm.org>, Paul Eggert <eggert <at> cs.ucla.edu>, Andrea Corallo <andrea_corallo <at> yahoo.it>, 42147 <at> debbugs.gnu.org
Subject: bug#42147: 28.0.50; pure vs side-effect-free, missing optimizations?
Date: Sat, 25 Jul 2020 16:07:37 -0400

> That sounds like a very reasonable definition. Do you think it's
> equivalent to my hypothesis and/or to the current behavior of the byte
> optimizer?

Probably not exactly: there might be functions which don't always
"preserve `eql`" but for which we decide nevertheless that it's OK to
precompute them at compile time for pragmatic reasons.

E.g. `concat`.


        Stefan
This bug report was last modified 4 years and 281 days ago.

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