From: Paul Eggert <eggert@cs.ucla.edu>
To: Jason Rumney <jasonr@gnu.org>
Cc: lekktu@gmail.com, 8545@debbugs.gnu.org, rms@gnu.org
Subject: bug#8545: issues with recent doprnt-related changes
Date: Sat, 30 Apr 2011 22:56:45 -0700 [thread overview]
Message-ID: <4DBCF61D.50000@cs.ucla.edu> (raw)
In-Reply-To: <87vcxvjbcm.fsf@gnu.org>
On 04/30/11 21:25, Jason Rumney wrote:
> You are also
> involving implicit casts here. Exactly where those casts happen is what
> is undefined.
I'm not sure what is meant here, as the program in question
doesn't have any implicit arithmetic conversions (or at least,
it doesn't on the typical 64-bit host I was talking about).
> That does not mean that INT_MAX + 1 is undefined.
It could well be that the exact expression "INT_MAX + 1"
has well-defined behavior on all platforms we care about,
and that it always returns INT_MIN. But I'm concerned
about the more general issue, which is whether Emacs code
can always assume that signed integer arithmetic
wraps around. Unfortunately, there are many practical
Emacs targets where it's incorrect to assume that.
next prev parent reply other threads:[~2011-05-01 5:56 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-25 5:46 bug#8545: issues with recent doprnt-related changes Paul Eggert
2011-04-25 9:00 ` Eli Zaretskii
2011-04-25 13:37 ` Stefan Monnier
2011-04-26 20:25 ` Paul Eggert
2011-04-27 1:14 ` Stefan Monnier
2011-04-26 6:02 ` Paul Eggert
2011-04-27 19:34 ` Eli Zaretskii
2011-04-27 23:51 ` Paul Eggert
2011-04-28 1:32 ` Juanma Barranquero
2011-04-28 3:11 ` Paul Eggert
2011-04-28 3:42 ` Juanma Barranquero
2011-04-28 5:06 ` Paul Eggert
2011-04-28 5:15 ` Eli Zaretskii
2011-04-28 5:29 ` Paul Eggert
2011-04-28 6:10 ` Eli Zaretskii
2011-04-28 6:42 ` Paul Eggert
2011-04-28 7:26 ` Eli Zaretskii
2011-04-28 7:54 ` Paul Eggert
2011-04-28 11:14 ` Eli Zaretskii
2011-04-29 12:28 ` Richard Stallman
2011-04-29 19:56 ` Eli Zaretskii
2011-04-29 23:49 ` Paul Eggert
2011-04-30 21:03 ` Richard Stallman
2011-05-01 5:41 ` Paul Eggert
2011-05-01 23:59 ` Richard Stallman
2011-05-02 0:23 ` Paul Eggert
[not found] ` <E1QH37h-0001yM-HR@fencepost.gnu.org>
2011-05-03 20:24 ` Paul Eggert
2011-05-01 4:25 ` Jason Rumney
2011-05-01 5:56 ` Paul Eggert [this message]
2011-05-01 8:12 ` Jason Rumney
2011-05-01 11:02 ` Andreas Schwab
2011-04-28 5:02 ` Eli Zaretskii
2011-04-28 5:50 ` Eli Zaretskii
[not found] ` <4DB9146D.2040702@cs.ucla.edu>
[not found] ` <E1QFQVO-0004Dq-6o@fencepost.gnu.org>
[not found] ` <4DB9E5FF.9020506@cs.ucla.edu>
2011-04-29 11:16 ` Eli Zaretskii
2011-04-29 14:41 ` Paul Eggert
2011-04-29 19:35 ` Eli Zaretskii
2011-04-29 20:32 ` Paul Eggert
2011-04-30 8:59 ` Eli Zaretskii
2011-05-04 7:28 ` Paul Eggert
2011-05-04 9:52 ` Eli Zaretskii
2011-05-04 14:56 ` Paul Eggert
2011-05-05 20:36 ` Eli Zaretskii
2011-05-06 13:33 ` Stefan Monnier
2011-05-06 14:41 ` Paul Eggert
2011-05-06 14:41 ` bug#8545: " Paul Eggert
2011-05-06 15:03 ` Eli Zaretskii
2011-05-06 17:13 ` bug#8545: " Stefan Monnier
2011-05-06 17:13 ` Stefan Monnier
2011-05-06 19:57 ` bug#8545: " Eli Zaretskii
2011-05-06 19:57 ` Eli Zaretskii
2011-05-07 3:18 ` bug#8545: " Stefan Monnier
2011-05-07 3:18 ` Stefan Monnier
2011-05-07 7:55 ` bug#8545: " Eli Zaretskii
2011-05-07 7:55 ` Eli Zaretskii
2011-05-06 15:03 ` bug#8545: " Eli Zaretskii
2011-05-06 13:33 ` Stefan Monnier
2011-05-05 20:36 ` Eli Zaretskii
2011-05-04 14:56 ` Paul Eggert
-- strict thread matches above, loose matches on Subject: below --
2011-05-01 18:19 bug#8601: * 2 -> * 4 typo fix in detect_coding_charset Paul Eggert
2011-05-01 19:06 ` Andreas Schwab
2011-05-01 19:25 ` Paul Eggert
2011-05-06 7:29 ` bug#8601: Merged fixes for 8600, 8601, 8602, and (partially) for 8545 Paul Eggert
2020-09-14 12:37 ` bug#8545: " Lars Ingebrigtsen
2020-09-14 18:41 ` Eli Zaretskii
2020-09-16 2:01 ` Paul Eggert
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