From: Andrew Pinski <pinskia@physics.uc.edu>
To: Gabriel Dos Reis <gdr@integrable-solutions.net>
Cc: Nathan Sidwell <nathan@codesourcery.com>,
gcc mailing list <gcc@gcc.gnu.org>
Subject: Re: Do C++ signed types have modulo semantics?
Date: Tue, 28 Jun 2005 14:05:00 -0000 [thread overview]
Message-ID: <a0517c9e4eb6906bbec924031404ab51@physics.uc.edu> (raw)
In-Reply-To: <m3r7emd1m0.fsf@uniton.integrable-solutions.net>
On Jun 28, 2005, at 9:58 AM, Gabriel Dos Reis wrote:
> Notice that in your rendition you're assuming that you can convert any
> unsigned value > INT_MAX to a int without invoking undefined behaviour.
If you read Nathan's mail correctly, the cast is implementation defined
and not undefined behavior so your argument does not work.
Quote from Nathan's mail (the emphases are not mine but Nathan's which
means he wanted
to you to read that part and not say it was undefined behavior):
> (provided we're on the standard 2's complement machine where the
> mapping between negative ints and unsigned is *implementation defined*
> to be the sane mapping, which I might point out you've already assumed
> in the wrap_sum I quoted).
-- Pinski
next prev parent reply other threads:[~2005-06-28 14:05 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <OF0E4366CA.5D54868B-ON4325702E.0036D351-4325702E.003973C5@il.ibm.com>
[not found] ` <m3k6keeibo.fsf@uniton.integrable-solutions.net>
2005-06-28 13:29 ` Nathan Sidwell
2005-06-28 13:59 ` Gabriel Dos Reis
2005-06-28 14:05 ` Andrew Pinski [this message]
2005-06-28 14:13 ` Gabriel Dos Reis
2005-06-28 15:30 ` Michael Veksler
2005-06-28 15:49 ` Nathan Sidwell
2005-06-28 15:58 ` Michael Veksler
2005-06-28 16:07 ` Andrew Pinski
2005-06-28 16:39 ` Gabriel Dos Reis
2005-06-28 15:55 ` Gabriel Dos Reis
2005-06-28 16:47 ` Joseph S. Myers
2005-06-28 17:58 ` Gabriel Dos Reis
2005-06-28 14:05 ` Nathan Sidwell
2005-06-27 14:39 Morten Welinder
2005-06-27 15:21 ` Gabriel Dos Reis
-- strict thread matches above, loose matches on Subject: below --
2005-06-27 5:09 Michael Veksler
2005-06-27 13:02 ` Nathan Sidwell
2005-06-27 14:10 ` Gabriel Dos Reis
2005-06-27 14:36 ` Nathan Sidwell
2005-06-27 14:47 ` Paul Koning
2005-06-27 15:21 ` Michael Veksler
2005-06-28 3:06 ` Mark Mitchell
2005-06-28 3:49 ` Gabriel Dos Reis
2005-06-28 10:08 ` Robert Dewar
2005-06-28 11:19 ` Steven Bosscher
2005-06-28 12:03 ` Ulrich Weigand
2005-06-28 12:09 ` Steven Bosscher
2005-06-29 16:46 ` Steven Bosscher
2005-06-29 18:01 ` Daniel Berlin
2005-06-29 18:32 ` Steven Bosscher
2005-06-29 18:45 ` Robert Dewar
2005-06-29 19:13 ` Nicholas Nethercote
2005-06-28 12:16 ` Paul Koning
2005-06-28 12:30 ` Steven Bosscher
2005-06-28 12:35 ` Michael Veksler
2005-06-28 12:38 ` Steven Bosscher
2005-06-28 16:54 ` Joe Buck
2005-06-28 17:02 ` Mark Mitchell
2005-06-28 17:08 ` Daniel Berlin
2005-06-28 18:12 ` Mark Mitchell
2005-06-28 17:46 ` Theodore Papadopoulo
2005-06-27 15:17 ` Gabriel Dos Reis
2005-06-30 20:53 ` Kai Henningsen
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