From: Vadiraj <vadiraj.cs@gmail.com>
To: Glynn Clements <glynn@gclements.plus.com>
Cc: linux-c-programming <linux-c-programming@vger.kernel.org>
Subject: Re: Any pointer to Byte Alignment & Structure Padding?
Date: Tue, 2 Aug 2005 16:51:21 +0530 [thread overview]
Message-ID: <6eee1c40508020421ceab653@mail.gmail.com> (raw)
In-Reply-To: <17134.43470.280296.644313@cerise.gclements.plus.com>
On 8/2/05, Glynn Clements <glynn@gclements.plus.com> wrote:
>
> Vadiraj wrote:
>
> > > Can any body provide some light on Byte Alignment & Structure Padding
> > > for gcc linux x86 32-bit?
> >
> > The system expects the address of a variable to be multiple of
> > its size. Meaning for 32 bit x86 int being 4 bytes. The address
> > location of a int variable is expected to be at multiple of 4.
> > ex 0 4 8 12 16. if its double then its expected it to be multiple of 8.
> > 0 8 16 ...
>
> Incorrect; 8-byte quantities (double and long long) are only 4-byte
> aligned, not 8-byte aligned.
Depends on compiler and architecture. With GCC 3.3.3 on cygwin I get
24 bytes for the same structe and also in Solaris system too.
meaning 8 byte alligned.
True that Gcc 2.9 on linux is 4 byte alligned.
--
cheers,
Vadi
next prev parent reply other threads:[~2005-08-02 11:21 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-01 11:43 Any pointer to Byte Alignment & Structure Padding? Amit Dang
[not found] ` <6eee1c40508010514517b5b90@mail.gmail.com>
2005-08-01 12:16 ` Vadiraj
[not found] ` <17134.43470.280296.644313@cerise.gclements.plus.com>
2005-08-02 11:21 ` Vadiraj [this message]
2005-08-02 11:40 ` Amit Dang
2005-08-02 16:39 ` Glynn Clements
2005-08-02 17:12 ` Vadiraj
2005-08-03 4:04 ` Amit Dang
[not found] ` <673ac06405080402432d0feda3@mail.gmail.com>
2005-08-04 15:23 ` Vadiraj
2005-08-04 16:28 ` Steve Graegert
2005-08-05 16:51 ` Vadiraj
2005-08-05 4:14 ` Amit Dang
2005-08-05 6:32 ` Steve Graegert
2005-08-05 6:49 ` Amit Dang
2005-08-05 7:09 ` Steve Graegert
2005-08-05 11:19 ` Glynn Clements
2005-08-05 10:15 ` Steve Graegert
2005-08-05 10:53 ` Amit Dang
2005-08-05 11:13 ` Steve Graegert
2005-08-05 11:28 ` Amit Dang
2005-08-05 11:37 ` Steve Graegert
2005-08-05 12:59 ` Glynn Clements
2005-08-05 11:31 ` Steve Graegert
2005-08-01 12:27 ` Amit Dang
2005-08-01 14:11 ` wwp
[not found] ` <003b01c59715$d3ffef00$9900a8c0@ispl091>
[not found] ` <6a00c8d5050801234267dd0f7f@mail.gmail.com>
[not found] ` <01dd01c5972f$5c3b62a0$9900a8c0@ispl091>
[not found] ` <17135.20687.821822.269575@cerise.gclements.plus.com>
[not found] ` <02c401c59745$2aaa0410$9900a8c0@ispl091>
2005-08-02 11:08 ` Progga
2005-08-02 11:34 ` Amit Dang
2005-08-02 11:32 ` Steve Graegert
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