From: Vincent Lefevre <vincent@vinc17.net>
To: tinycc-devel@nongnu.org
Cc: "guix-devel@gnu.org" <guix-devel@gnu.org>,
grischka <grishka@gmx.de>,
"bootstrappable@freelists.org" <bootstrappable@freelists.org>
Subject: Re: [Tinycc-devel] [bootstrappable] Re: Re: wip-full-source-bootstrap: from a 357-byte `hex0' to 'hello'
Date: Fri, 8 Jan 2021 16:16:51 +0100 [thread overview]
Message-ID: <X/h3Y6vV9shQ2WJR@zira.vinc17.org> (raw)
In-Reply-To: <SA9PR09MB553504F038BE4D87C2542ED3C6AE0@SA9PR09MB5535.namprd09.prod.outlook.com>
On 2021-01-08 13:36:26 +0000, Orians, Jeremiah (DTMB) wrote:
> > If so, is libc malloc supposed to ensure alignment of allocated memory?
> > According to https://man7.org/linux/man-pages/man3/malloc.3.html yes.
> > @Janneke: So our mes libc malloc should be aligning the stuff--but it's not doing it. So it's a bug in our libc.
>
> Looks like you'll have to waste 3.7bytes on average per malloc to
> always pad to the 8byte boundary.
Note that it's an 8-byte boundary for 32-bit systems, but a 16-byte
boundary for 64-bit systems:
https://www.gnu.org/software/libc/manual/html_node/Aligned-Memory-Blocks.html
And about the average waste, this depends on other factors (the
main one may be that the block size is often a multiple of some
power of two).
--
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
next prev parent reply other threads:[~2021-01-08 16:06 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-04 17:01 wip-full-source-bootstrap: from a 357-byte `hex0' to 'hello' Jan Nieuwenhuizen
2021-01-05 0:49 ` [bootstrappable] " jeremiah
2021-01-05 16:58 ` Pierre Neidhardt
2021-01-06 11:32 ` [bootstrappable] " Ludovic Courtès
2021-01-06 11:46 ` [bootstrappable] " Andrius Štikonas via Development of GNU Guix and the GNU System distribution.
2021-01-06 14:03 ` Orians, Jeremiah (DTMB)
2021-01-14 21:37 ` Ludovic Courtès
2021-01-15 1:27 ` jeremiah
2021-01-21 11:09 ` Ludovic Courtès
2021-01-21 17:52 ` Orians, Jeremiah (DTMB)
2021-01-28 13:40 ` Ludovic Courtès
2021-01-28 13:44 ` Orians, Jeremiah (DTMB)
2021-01-06 14:38 ` [bootstrappable] " Paul Sherwood
2021-01-07 10:43 ` Jan Nieuwenhuizen
2021-01-07 20:10 ` [bootstrappable] " Danny Milosavljevic
2021-01-07 20:23 ` Danny Milosavljevic
2021-01-07 22:52 ` Danny Milosavljevic
2021-01-08 6:25 ` Jan Nieuwenhuizen
2021-01-08 8:05 ` [Tinycc-devel] " arnold
2021-01-08 13:02 ` Jan Nieuwenhuizen
2021-01-08 13:43 ` Danny Milosavljevic
2021-01-08 14:07 ` Danny Milosavljevic
2021-01-08 16:15 ` Jan Nieuwenhuizen
2021-01-08 18:56 ` Danny Milosavljevic
2021-01-08 21:11 ` Danny Milosavljevic
2021-01-08 22:13 ` Jan Nieuwenhuizen
2021-01-08 7:16 ` [Tinycc-devel] " grischka
2021-01-08 13:25 ` Danny Milosavljevic
2021-01-08 13:36 ` [bootstrappable] Re: [Tinycc-devel] " Orians, Jeremiah (DTMB)
2021-01-08 15:16 ` Vincent Lefevre [this message]
2021-01-08 16:12 ` [Tinycc-devel] [bootstrappable] " Jan Nieuwenhuizen
2021-01-25 22:47 ` ARM Unified Assembly Language - GNU as does some weird stuff Danny Milosavljevic
2021-01-25 23:12 ` [bootstrappable] " Orians, Jeremiah (DTMB)
2021-01-26 1:14 ` Danny Milosavljevic
2021-01-08 0:29 ` wip-full-source-bootstrap: from a 357-byte `hex0' to 'hello' Jan Wielkiewicz
2021-01-20 20:19 ` Timothy Sample
2021-01-25 18:48 ` Efraim Flashner
2021-01-29 7:23 ` [bootstrappable] " Jan Nieuwenhuizen
2021-01-29 10:18 ` andrius--- via Development of GNU Guix and the GNU System distribution.
2021-01-29 16:02 ` Orians, Jeremiah (DTMB)
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