From: Edd Barrett <vext01@gmail.com>
To: Ian Lance Taylor <iant@google.com>
Cc: Edd Barrett <vext01@gmail.com>, gcc@gcc.gnu.org
Subject: Re: GCC's switch table code generation
Date: Thu, 08 Oct 2009 11:21:00 -0000 [thread overview]
Message-ID: <20091008105432.GA698@edd.kent.ac.uk> (raw)
In-Reply-To: <mcrskduzg0z.fsf@dhcp-172-17-9-151.mtv.corp.google.com>
On Wed, Oct 07, 2009 at 09:05:48PM -0700, Ian Lance Taylor wrote:
> Edd Barrett <vext01@gmail.com> writes:
>
> > I would be really interested to know how GCC:
> > * Decides whether or not to embed tables in the data segment of the binary.
> > * Selects the comparisons in the above tree.
>
> The relevant code is expand_case and friends in gcc/stmt.c. Where a
> jump table should go is decided on a target by target basis by the
> backend macro JUMP_TABLES_IN_TEXT_SECTION.
Many thanks for the pointer
>
> > Perhaps someone knows of a good paper/book on this topic which could
> > be of use, or a relevant section of code in the GCC sources (at the
> > moment I am overwhelmed by the source tree).
>
> You may be interested in reading Roger Sayle's paper in the 2008 gcc
> summit, linked from http://ols.fedoraproject.org/GCC/Reprints-2008/ .
Excellent paper. Again many thanks!
--
Best Regards
Edd Barrett
http://students.dec.bmth.ac.uk/ebarrett
prev parent reply other threads:[~2009-10-08 10:56 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-08 1:25 Edd Barrett
2009-10-08 6:49 ` Ian Lance Taylor
2009-10-08 11:21 ` Edd Barrett [this message]
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