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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Message #119 received at 42147 <at> debbugs.gnu.org (full text, mbox):

From: Mattias Engdegård <mattiase <at> acm.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Eli Zaretskii <eliz <at> gnu.org>, Paul Eggert <eggert <at> cs.ucla.edu>,
 andrea_corallo <at> yahoo.it, 42147 <at> debbugs.gnu.org
Subject: Re: bug#42147: 28.0.50; pure vs side-effect-free, missing
 optimizations?
Date: Sat, 4 Jul 2020 18:44:02 +0200

4 juli 2020 kl. 18.33 skrev Stefan Monnier <monnier <at> iro.umontreal.ca>:

> Is there a way to tell gcc to try and avoid x87's idiosyncrasies without
> being platform-dependent (or at least without imposing SSE2, since
> I still use Emacs on my old Thinkpad X30)?

There is -ffloat-store, which cures the 80 bit intermediary result problem while retaining the double-rounding one (which tends to be less common in practice). Maybe it is good enough?
This bug report was last modified 4 years and 281 days ago.

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