From: Paolo Bonzini <paolo.bonzini@lu.unisi.ch>
To: Paul Schlie <schlie@comcast.net>, GCC Development <gcc@gcc.gnu.org>
Subject: Re: basic VRP min/max range overflow question
Date: Fri, 17 Jun 2005 12:09:00 -0000 [thread overview]
Message-ID: <42B2BDBB.3060700@lu.unisi.ch> (raw)
In-Reply-To: <BED82DB3.A845%schlie@comcast.net>
> [#1] The signed C integer types int, long, long long and the
> corresponding unsigned types are compatible with LIA-1. If an
> implementation adds support for the LIA-1 exceptional values
> integer_overflow and undefined, then those types are LIA-1
> conformant types.
>
>
They need not wrap around. People that are actually on the C standards
committee have told you this multiple times.
> C's unsigned integer types are "modulo" in the
> LIA-1 sense in that overflows or out-of-bounds results silently
> wrap. An implementation that defines signed integer types as also
> being modulo need not detect integer overflow, in which case,
> only integer divide-by-zero need be detected.
>
>
This is different from signed types. Actually I was wrong,
[10U, UINT_MAX] + [ 1U, 1U ] == ~[ UINT_MIN + 1, 10U ]
Paolo
next prev parent reply other threads:[~2005-06-17 12:09 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-17 12:00 Paul Schlie
2005-06-17 12:09 ` Paolo Bonzini [this message]
2005-06-17 18:29 ` Paul Schlie
2005-06-17 22:09 ` Paolo Bonzini
2005-06-17 22:48 ` Diego Novillo
2005-06-18 0:20 ` Paul Schlie
2005-06-18 0:23 ` Andrew Pinski
2005-06-18 0:59 ` Paul Schlie
2005-06-18 1:10 ` Dale Johannesen
2005-06-18 4:09 ` Mike Stump
[not found] ` <25364524.1119085038744.JavaMail.root@dtm1eusosrv72.dtm.ops.eu.uu.net>
2005-06-18 11:47 ` Toon Moene
2005-06-18 2:02 ` Robert Dewar
-- strict thread matches above, loose matches on Subject: below --
2005-06-18 14:15 Paul Schlie
2005-06-18 16:19 ` Joseph S. Myers
2005-06-18 17:44 ` Paul Schlie
2005-06-18 18:05 ` Paul Schlie
2005-06-18 18:21 ` Joseph S. Myers
2005-06-18 18:50 ` Paul Schlie
2005-06-18 19:57 ` Joseph S. Myers
2005-06-18 21:01 ` Florian Weimer
2005-06-19 10:18 ` Kai Henningsen
2005-06-20 22:20 ` Mike Stump
2005-06-18 19:16 ` Paul Schlie
2005-06-18 21:26 ` Robert Dewar
2005-06-19 18:23 ` Paul Schlie
2005-06-20 2:44 ` Robert Dewar
2005-06-20 5:55 ` Paul Schlie
2005-06-20 10:14 ` Michael Veksler
2005-06-20 11:04 ` Paul Schlie
2005-06-20 11:32 ` Robert Dewar
2005-06-20 12:08 ` Paul Schlie
2005-06-20 12:39 ` Robert Dewar
2005-06-20 13:01 ` Paul Schlie
2005-06-20 13:14 ` Robert Dewar
2005-06-20 12:23 ` Michael Veksler
2005-06-20 12:46 ` Robert Dewar
2005-06-20 10:43 ` Robert Dewar
2005-06-20 10:54 ` Robert Dewar
2005-06-20 11:26 ` Paul Schlie
2005-06-20 11:34 ` Robert Dewar
2005-06-20 12:09 ` Paul Schlie
2005-06-20 11:14 ` Paul Schlie
2005-06-20 12:53 ` Michael Veksler
2005-06-20 12:59 ` Robert Dewar
2005-06-20 13:09 ` Paul Schlie
2005-06-20 13:17 ` Robert Dewar
2005-06-20 14:54 ` Michael Veksler
2005-06-20 18:01 ` Paul Schlie
2005-06-18 18:08 ` Joseph S. Myers
2005-06-18 21:08 ` Robert Dewar
2005-06-19 10:18 ` Kai Henningsen
2005-06-19 10:49 ` Robert Dewar
2005-06-20 13:22 ` Sebastian Pop
2005-06-20 18:10 ` DJ Delorie
2005-07-13 7:57 ` Sebastian Pop
2005-07-13 15:18 ` DJ Delorie
2005-06-21 15:21 ` Robert Dewar
2005-07-18 16:34 ` Sebastian Pop
2005-07-18 16:44 ` Robert Dewar
2005-07-19 6:44 ` Sebastian Pop
2005-07-19 7:07 ` Michael Veksler
2005-07-19 9:55 ` Sebastian Pop
2005-07-19 10:22 ` Michael Veksler
2005-06-20 19:53 ` Kai Henningsen
2005-06-18 20:55 ` Robert Dewar
2005-06-18 22:45 ` Tristan Wibberley
2005-06-20 21:47 ` Mike Stump
2005-06-17 4:28 Paul Schlie
2005-06-17 7:03 ` Paolo Bonzini
2005-06-17 12:28 ` Diego Novillo
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