From: Jakub Jelinek <jakub@redhat.com>
To: Lawrence Crowl <crowl@google.com>
Cc: Richard Guenther <richard.guenther@gmail.com>,
Bernd Schmidt <bernds@codesourcery.com>,
Gabriel Dos Reis <gdr@integrable-solutions.net>,
David Edelsohn <dje.gcc@gmail.com>,
Diego Novillo <dnovillo@google.com>, gcc <gcc@gcc.gnu.org>
Subject: Re: Switching to C++ by default in 4.8
Date: Wed, 11 Apr 2012 06:55:00 -0000 [thread overview]
Message-ID: <20120411065531.GL6148@sunsite.ms.mff.cuni.cz> (raw)
In-Reply-To: <CAGqM8fZLr6ZNsOvd4s8ijB0fFXq18T-4aqZeZWUJk5qRtfPM5g@mail.gmail.com>
On Tue, Apr 10, 2012 at 06:35:58PM -0700, Lawrence Crowl wrote:
> The standard says they need not ignore them.
>
> I was thinking more about iterating over the contents. What in the
> current code is an indirect function call inside of a loop becomes
> mostly be inline functions in a C++ iterator style. The loop is now
> fully graspable by the optimizer.
That comes with its cost though, as we have hundreds of hashtables for
various kinds of types, you'd get hundreds of different instantiations of
the hash table code. hashtab.c is significantly more I-cache friendly
than that. If a hash table doesn't need to be rehashed and the *with_hash
routines are used, only the eq_f callback is called a few times (on each
collision).
Jakub
next prev parent reply other threads:[~2012-04-11 6:55 UTC|newest]
Thread overview: 182+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-03 17:38 Diego Novillo
2012-04-03 19:39 ` Paweł Sikora
2012-04-03 20:52 ` Ian Lance Taylor
2012-04-03 21:34 ` Paweł Sikora
2012-04-20 20:14 ` Joseph S. Myers
2012-04-04 5:19 ` Basile Starynkevitch
2012-04-04 1:13 ` David Edelsohn
2012-04-04 4:00 ` Ian Lance Taylor
2012-04-04 4:42 ` Miles Bader
2012-04-04 8:32 ` Gabriel Dos Reis
2012-04-04 9:06 ` Richard Guenther
2012-04-04 9:10 ` Gabriel Dos Reis
2012-04-04 9:15 ` Gabriel Dos Reis
2012-04-04 9:59 ` Richard Guenther
2012-04-04 10:02 ` Richard Guenther
2012-04-04 11:20 ` Diego Novillo
2012-04-04 11:38 ` Richard Guenther
2012-04-04 14:12 ` Tom Tromey
2012-04-04 14:45 ` Richard Guenther
2012-04-04 14:48 ` Richard Guenther
2012-04-14 1:35 ` Chiheng Xu
2012-04-14 9:09 ` Robert Dewar
2012-04-14 10:03 ` Chiheng Xu
2012-04-14 11:13 ` Robert Dewar
2012-04-14 11:41 ` Jonathan Wakely
2012-04-14 10:39 ` Gabriel Dos Reis
2012-04-14 11:08 ` Robert Dewar
2012-04-16 9:37 ` Chiheng Xu
2012-04-16 9:38 ` Jonathan Wakely
2012-04-17 9:11 ` Robert Dewar
2012-04-05 12:40 ` Pedro Lamarão
2012-04-05 13:05 ` Richard Guenther
2012-04-05 14:21 ` Diego Novillo
2012-04-05 14:24 ` Richard Guenther
2012-04-05 14:36 ` Diego Novillo
2012-04-05 20:17 ` David Edelsohn
2012-04-05 20:36 ` Gabriel Dos Reis
2012-04-06 0:11 ` David Edelsohn
2012-04-09 10:37 ` Richard Guenther
2012-04-09 15:07 ` David Edelsohn
2012-04-10 22:04 ` Pedro Lamarão
2012-04-10 22:56 ` Diego Novillo
2012-04-04 11:53 ` Bernd Schmidt
2012-04-04 12:04 ` Richard Guenther
2012-04-04 14:59 ` Diego Novillo
2012-04-04 17:54 ` Lawrence Crowl
2012-04-05 9:18 ` Richard Guenther
2012-04-05 20:07 ` Lawrence Crowl
2012-04-09 10:40 ` Richard Guenther
2012-04-09 17:56 ` Lawrence Crowl
2012-04-09 18:22 ` Jakub Jelinek
2012-04-09 18:52 ` Lawrence Crowl
2012-04-09 18:54 ` Jakub Jelinek
2012-04-09 21:15 ` Lawrence Crowl
2012-04-10 11:09 ` Richard Guenther
2012-04-11 1:36 ` Lawrence Crowl
2012-04-11 6:55 ` Jakub Jelinek [this message]
2012-04-13 23:26 ` Dave Korn
2012-04-11 9:32 ` Richard Guenther
2012-04-14 3:07 ` Chiheng Xu
2012-04-14 3:04 ` Chiheng Xu
2012-04-14 21:25 ` Lawrence Crowl
2012-04-09 23:34 ` Xinliang David Li
2012-04-10 8:46 ` Jakub Jelinek
2012-04-10 12:26 ` Michael Matz
2012-04-10 15:51 ` David Edelsohn
2012-04-10 16:05 ` Gabriel Dos Reis
2012-04-10 16:13 ` Diego Novillo
2012-04-11 9:17 ` Richard Guenther
2012-04-11 16:35 ` Xinliang David Li
2012-04-10 16:12 ` Xinliang David Li
2012-04-10 16:24 ` Michael Matz
2012-04-10 17:08 ` Xinliang David Li
2012-04-10 17:29 ` Torvald Riegel
2012-04-10 18:00 ` Eric Botcazou
2012-04-10 19:56 ` Torvald Riegel
2012-04-10 21:13 ` Eric Botcazou
2012-04-10 21:29 ` Torvald Riegel
2012-04-10 23:15 ` Eric Botcazou
2012-04-11 20:57 ` Torvald Riegel
2012-04-11 21:15 ` Eric Botcazou
2012-04-11 21:43 ` Torvald Riegel
2012-04-13 23:33 ` Dave Korn
2012-04-11 9:24 ` Richard Guenther
2012-04-11 12:58 ` Torvald Riegel
2012-04-11 13:13 ` Richard Guenther
2012-04-11 13:23 ` Gabriel Dos Reis
2012-04-11 14:19 ` Torvald Riegel
2012-04-11 17:24 ` Xinliang David Li
2012-04-11 18:17 ` Andrew Pinski
2012-04-11 20:02 ` Xinliang David Li
2012-04-12 5:08 ` Ian Lance Taylor
2012-04-12 6:12 ` Miles Bader
2012-04-12 6:22 ` James Dennett
2012-04-11 18:26 ` Jonathan Wakely
2012-04-11 18:41 ` Pedro Alves
2012-04-11 20:00 ` Xinliang David Li
2012-04-11 20:05 ` Jonathan Wakely
2012-04-12 5:10 ` Ian Lance Taylor
[not found] ` <12130397.ZsTVnyYbKR@pawels>
2012-04-11 13:14 ` Richard Guenther
2012-04-11 13:24 ` Bernd Schmidt
2012-04-11 17:31 ` Xinliang David Li
2012-04-11 18:37 ` Basile Starynkevitch
2012-04-11 18:52 ` Gabriel Dos Reis
2012-04-11 20:14 ` Xinliang David Li
2012-04-12 15:51 ` Ludovic Courtès
2012-04-13 23:45 ` Dave Korn
2012-04-11 14:41 ` Jonathan Wakely
2012-04-11 17:13 ` Xinliang David Li
2012-04-11 19:30 ` Tobias Burnus
2012-04-11 20:44 ` Torvald Riegel
2012-04-13 23:48 ` Dave Korn
2012-04-13 23:37 ` Dave Korn
2012-04-10 17:48 ` DJ Delorie
2012-04-10 19:21 ` Dave Korn
2012-04-10 16:23 ` Xinliang David Li
2012-04-10 16:39 ` Jakub Jelinek
2012-04-10 16:43 ` Gabriel Dos Reis
2012-04-10 16:47 ` Diego Novillo
2012-04-12 19:40 ` Tom Tromey
2012-04-12 19:42 ` Diego Novillo
2012-04-12 19:51 ` Tom Tromey
2012-04-10 17:37 ` Torvald Riegel
2012-04-10 21:39 ` Miles Bader
2012-04-10 22:32 ` Bernd Schmidt
2012-04-10 23:28 ` Eric Botcazou
2012-04-10 23:35 ` Gabriel Dos Reis
2012-04-11 7:49 ` Eric Botcazou
2012-04-11 7:55 ` Gabriel Dos Reis
2012-04-11 8:11 ` Eric Botcazou
2012-04-11 11:41 ` Jeff Law
2012-04-11 7:02 ` Jakub Jelinek
2012-04-11 7:46 ` Gabriel Dos Reis
2012-04-11 7:51 ` Jakub Jelinek
2012-04-11 12:37 ` Bernd Schmidt
2012-04-11 12:47 ` Richard Guenther
2012-04-11 17:10 ` Xinliang David Li
2012-04-11 13:20 ` Gabriel Dos Reis
2012-04-11 13:29 ` Jakub Jelinek
2012-04-11 13:44 ` Gabriel Dos Reis
2012-04-11 14:45 ` David Edelsohn
2012-04-11 17:41 ` Xinliang David Li
2012-04-11 17:08 ` Xinliang David Li
2012-04-11 8:07 ` Eric Botcazou
2012-04-11 9:45 ` Richard Guenther
2012-04-10 17:54 ` Xinliang David Li
2012-04-11 12:44 ` Marek Polacek
2012-04-11 16:49 ` Xinliang David Li
2012-04-11 2:24 ` Lawrence Crowl
2012-04-11 9:43 ` Richard Guenther
2012-04-11 16:47 ` Xinliang David Li
2012-04-11 20:48 ` Paweł Sikora
2012-04-11 22:34 ` Lawrence Crowl
2012-04-12 9:28 ` Chiheng Xu
2012-04-12 10:30 ` Richard Guenther
2012-04-14 1:15 ` Chiheng Xu
2012-04-14 6:30 ` Chiheng Xu
2012-04-14 9:08 ` Robert Dewar
2012-04-14 10:38 ` Chiheng Xu
2012-04-14 11:06 ` Robert Dewar
2012-04-10 16:42 ` Paweł Sikora
2012-04-10 19:23 ` Dave Korn
2012-04-10 20:39 ` Andrew Pinski
2012-04-11 9:27 ` Richard Guenther
2012-04-11 1:01 ` Lawrence Crowl
2012-04-14 3:40 ` Chiheng Xu
2012-04-14 3:48 ` Chiheng Xu
2012-04-15 20:11 ` Chiheng Xu
2012-04-16 7:48 ` Duncan Sands
2012-04-16 9:23 ` Chiheng Xu
2012-04-16 18:53 ` Oleg Endo
2012-04-17 22:03 ` Chiheng Xu
2012-04-18 0:15 ` Oleg Endo
2012-04-10 11:14 ` Richard Guenther
2012-04-10 16:33 ` Xinliang David Li
2012-04-14 2:41 ` Chiheng Xu
2012-04-04 11:22 ` Diego Novillo
2012-04-04 7:07 ` Tristan Gingold
2012-04-04 13:13 ` Ian Lance Taylor
2012-04-04 13:32 ` Tristan Gingold
2012-04-04 14:37 ` Gabriel Dos Reis
2012-04-04 14:52 ` Tristan Gingold
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