From: "Mattias Engdegård" <mattiase@acm.org>
To: "Vincent Belaïche" <vincent.b.1@hotmail.fr>
Cc: Lars Ingebrigtsen <larsi@gnus.org>, 43764-done@debbugs.gnu.org
Subject: bug#43764: Calc shift right broken
Date: Tue, 13 Oct 2020 11:56:50 +0200 [thread overview]
Message-ID: <550C4DEF-DBAA-4175-98BC-DB484A3B89CF@acm.org> (raw)
In-Reply-To: <PR3PR06MB6843D55F5B94F69C50AA1F6284080@PR3PR06MB6843.eurprd06.prod.outlook.com>
9 okt. 2020 kl. 17.34 skrev Vincent Belaïche <vincent.b.1@hotmail.fr>:
> • set bit width 0 would remove the automatic clipping meaning infinite width.
The previously mentioned patch implementing this has now been pushed to Emacs master. Thanks again for the suggestion!
I should also note the rationale for disabling left/right rotation when the word size is set to zero: while it would make sense to define
(rotate-left x 1) =>
x≥0: (shift-left x 1)
x<0: (+ (shift-left x 1) 1)
(rotate-right x 1) =>
x≥0, x even: (shift-right x 1)
x<0, x odd: (shift-right x 1),
the two remaining cases of rotate right with {x≥0, x odd} or {x<0, x even} cannot result in a finite integer.
If someone has a better idea, or would like rotation to be implemented as a partial function according to the above definition, please comment. For now the bug is closed.
next prev parent reply other threads:[~2020-10-13 9:56 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
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 [this message]
2020-11-04 11:14 ` Vincent Belaïche
2020-11-04 11:54 ` Mattias Engdegård
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