From: "Mattias Engdegård" <mattiase@acm.org>
To: Lars Ingebrigtsen <larsi@gnus.org>
Cc: "Vincent Belaïche" <vincent.b.1@hotmail.fr>, 43764@debbugs.gnu.org
Subject: bug#43764: Calc shift right broken
Date: Fri, 9 Oct 2020 17:29:58 +0200 [thread overview]
Message-ID: <C9D5B06A-AC26-45A1-8FD2-C8D8132DF944@acm.org> (raw)
In-Reply-To: <4648BF2F-8507-4D39-85F1-1C40C0E8BFC2@acm.org>
> What about a narrower change: clip the value after shifting right instead of before?
On the other hand it would introduce an inconsistency with arithmetic right shift which ignores bits above the word size.
Thus I will do nothing at all unless Vincent or anyone else speaks up.
However, this bug has already been a success since inspecting the code revealed a bug in the arithmetic right shift that has now been fixed, and there is now a fairly comprehensive test for all binary shift and rotate operations which should make future changes a lot safer and easier.
next prev parent reply other threads:[~2020-10-09 15:29 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-02 15:28 bug#43764: Calc shift right broken Vincent Belaïche
2020-10-02 20:49 ` Mattias Engdegård
2020-10-05 8:12 ` Lars Ingebrigtsen
2020-10-05 10:34 ` Mattias Engdegård
2020-10-06 1:28 ` Lars Ingebrigtsen
2020-10-08 12:24 ` Mattias Engdegård
2020-10-09 15:29 ` Mattias Engdegård [this message]
2020-10-09 15:34 ` Vincent Belaïche
2020-10-10 16:24 ` Mattias Engdegård
2020-10-10 16:31 ` Mattias Engdegård
2020-10-13 9:56 ` Mattias Engdegård
2020-11-04 11:14 ` Vincent Belaïche
2020-11-04 11:54 ` Mattias Engdegård
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