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From: Paul Eggert <eggert@cs.ucla.edu>
To: Fabrice Popineau <fabrice.popineau@supelec.fr>
Cc: Eli Zaretskii <eliz@gnu.org>,
	ajmr@ilovetortilladepatatas.com, emacs-devel@gnu.org
Subject: Re: Windows 64 port
Date: Mon, 20 Feb 2012 15:46:22 -0800	[thread overview]
Message-ID: <4F42DB4E.9010709@cs.ucla.edu> (raw)
In-Reply-To: <CAFgFV9M=2ckpeaxBSYpOJsjAApHo2a1BJTVo-yeAnfQnJfsO3g@mail.gmail.com>

On 02/20/2012 03:11 PM, Fabrice Popineau wrote:
> in several places the compiler (not gcc, but msvc) inserted sign
> extent instructions.  I tracked them down to mismatches between
> ints and intptr_t or ptrdiff_t. I fixed them by removing all
> compiler warnings of this kind.

OK, but we need to worry only about code that is actually wrong
unless the types are changed.  Extending an int to a long long is
not a bug by itself, and most likely won't even lead to a bug
since it cannot lose information, so most likely there's no need
to worry about inserted sign-extend instructions.  Even converting
a long long to an int is not necessarily a bug: it's a problem
only if the actual value at run-time does not fit in int range.

In short, we need not worry about size mismatches in general; only
mismatches that cause real problems.  In this context an MSVC
warning by itself does not count as a real problem.



  reply	other threads:[~2012-02-20 23:46 UTC|newest]

Thread overview: 75+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-02-19 20:18 Windows 64 port AJMR
2012-02-19 21:26 ` Eli Zaretskii
2012-02-19 22:05   ` Fabrice Popineau
2012-02-20  3:53     ` Eli Zaretskii
2012-02-20 17:48     ` Paul Eggert
2012-02-20 19:20       ` Fabrice Popineau
2012-02-20 20:43         ` Paul Eggert
2012-02-20 20:58           ` Eli Zaretskii
2012-02-20 23:11             ` Fabrice Popineau
2012-02-20 23:46               ` Paul Eggert [this message]
2012-02-21 13:22         ` Stefan Monnier
2012-02-21 18:26           ` Paul Eggert
2012-02-22 10:39         ` Richard Stallman
2012-02-22 16:27           ` Eli Zaretskii
2012-02-23 18:44             ` Richard Stallman
2012-02-23 19:16               ` Aurélien
2012-02-23 19:50                 ` Lennart Borgman
2012-02-23 20:48                 ` Fabrice Popineau
2012-02-24  5:52                   ` Aurélien
2012-02-28 21:00       ` Fabrice Popineau
2012-02-28 22:09         ` Paul Eggert
2012-02-28 22:39           ` Fabrice Popineau
2012-02-29 18:08             ` Eli Zaretskii
2012-02-29 22:08               ` Paul Eggert
2012-02-29 18:04           ` Eli Zaretskii
2012-02-29 19:43             ` Paul Eggert
2012-02-29 21:24               ` Eli Zaretskii
2012-03-01  3:34                 ` Paul Eggert
2012-03-01  4:03                   ` Eli Zaretskii
2012-03-01  6:28                     ` Paul Eggert
2012-03-01  7:04                       ` Fabrice Popineau
2012-03-22 17:31               ` Fabrice Popineau
2012-03-23 18:26                 ` Paul Eggert
2012-03-24  9:27                   ` Fabrice Popineau
2012-03-22 17:39           ` Fabrice Popineau
2012-03-22 18:02             ` Andreas Schwab
2012-03-22 18:34               ` Fabrice Popineau
2012-03-22 22:46                 ` Andreas Schwab
2012-03-22 23:06                   ` Fabrice Popineau
2012-03-22 23:38                     ` Andreas Schwab
2012-03-23  8:12                       ` Eli Zaretskii
2012-03-23  9:45                         ` Andreas Schwab
2012-03-23 10:27                           ` Fabrice Popineau
2012-03-23 10:42                             ` Andreas Schwab
2012-03-23 12:21                             ` Eli Zaretskii
2012-03-23 10:11                         ` Fabrice Popineau
2012-03-23 18:13                           ` Paul Eggert
2012-02-20 20:47     ` Eli Zaretskii
2012-02-26 20:17       ` AJMR
2012-02-26 21:25         ` Eli Zaretskii
2012-02-27 17:37           ` AJMR
2012-02-28 21:32       ` Fabrice Popineau
2012-03-01  3:23         ` Paul Eggert
2012-03-01  7:24           ` Fabrice Popineau
2012-03-01  8:58             ` Paul Eggert
2012-03-01 17:45               ` Eli Zaretskii
2012-03-01 20:05               ` Fabrice Popineau
2012-03-02  9:22               ` Eli Zaretskii
2012-03-02 20:35                 ` Paul Eggert
2012-03-02 21:32                   ` Fabrice Popineau
2012-03-02 22:06                   ` Eli Zaretskii
2012-03-03  5:42                     ` Paul Eggert
2012-03-03  7:18                       ` Eli Zaretskii
2012-03-04 21:48                         ` Paul Eggert
2012-03-03  7:58             ` Eli Zaretskii
2012-03-10 13:43               ` Eli Zaretskii
2012-03-22 17:15           ` Fabrice Popineau
2012-03-22 17:22           ` Fabrice Popineau
2012-03-22 18:29           ` Fabrice Popineau
2012-03-22 20:53             ` Stefan Monnier
2012-03-27 12:47           ` Fabrice Popineau
2012-03-27 16:08             ` Paul Eggert
2012-02-20  9:41 ` Richard Stallman
2012-02-20 10:28   ` Dani Moncayo
2012-02-21 12:10     ` Richard Stallman

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