From: Richard Guenther <richard.guenther@gmail.com>
To: Bernd Schmidt <bernds@codesourcery.com>
Cc: GCC Patches <gcc-patches@gcc.gnu.org>
Subject: Re: Combine four insns
Date: Fri, 06 Aug 2010 23:47:00 -0000 [thread overview]
Message-ID: <AANLkTi=tnhXOPPaG8JM_TNFScoPPefY0aWi_Zjth5Y46@mail.gmail.com> (raw)
In-Reply-To: <4C5C8F7C.6010509@codesourcery.com>
On Sat, Aug 7, 2010 at 12:41 AM, Bernd Schmidt <bernds@codesourcery.com> wrote:
> On 08/06/2010 10:37 PM, Richard Guenther wrote:
>> No four into three?
>
> I did not implement this. It's probably possible, but I'm not convinced
> it would be worthwhile. There are a few other things we could try with
> the combiner, such as 2->2 combinations, which is similar to what I did
> with reload_combine recently.
>
>> I think it's still reasonable (and I agree with that combine is a proper
>> place to do this). Can you, for the list of examples you found where
>> it helps file enhancement bugreports so that we might do sth here
>> on the tree level or do better initial expansion?
>
> Filed PRs 45214 through 45218, which should give reasonably good
> coverage. I'll add a note to 42172.
Thanks for doing this. I think the patch is ok if you guard the
4-way combines by flag_expensive_optimizations.
Thanks,
Richard.
>
> Bernd
>
next prev parent reply other threads:[~2010-08-06 23:47 UTC|newest]
Thread overview: 129+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-06 14:49 Bernd Schmidt
2010-08-06 15:04 ` Richard Guenther
2010-08-06 20:08 ` Bernd Schmidt
2010-08-06 20:37 ` Richard Guenther
2010-08-06 21:53 ` Jeff Law
2010-08-06 22:41 ` Bernd Schmidt
2010-08-06 23:47 ` Richard Guenther [this message]
2010-08-07 8:11 ` Eric Botcazou
2010-08-09 12:29 ` Bernd Schmidt
2010-08-09 12:39 ` Steven Bosscher
2010-08-09 13:48 ` Bernd Schmidt
2010-08-10 2:51 ` Laurynas Biveinis
2010-08-09 12:41 ` Michael Matz
2010-08-09 14:34 ` Bernd Schmidt
2010-08-09 14:39 ` Toon Moene
2010-08-09 14:50 ` Steven Bosscher
2010-08-09 14:58 ` The speed of the compiler, was: " Toon Moene
2010-08-09 15:00 ` Paul Koning
2010-08-09 15:33 ` Diego Novillo
2010-08-09 15:53 ` Mark Mitchell
2010-08-09 17:15 ` Toon Moene
2010-08-09 17:19 ` Diego Novillo
2010-08-09 17:29 ` Toon Moene
2010-08-09 23:24 ` Chris Lattner
2010-08-10 13:02 ` Toon Moene
2010-08-10 15:36 ` Chris Lattner
2010-08-10 14:58 ` Andi Kleen
2010-08-10 15:03 ` Richard Guenther
2010-08-10 15:32 ` Andi Kleen
2010-08-10 20:09 ` Tom Tromey
2010-08-10 20:23 ` Andi Kleen
2010-08-10 22:40 ` Mike Stump
2010-08-10 23:16 ` Tom Tromey
2010-08-12 21:09 ` Nathan Froyd
2010-08-17 15:14 ` Mark Mitchell
2010-08-10 20:15 ` H.J. Lu
2010-08-12 21:38 ` Vectorized _cpp_clean_line Richard Henderson
2010-08-12 22:18 ` Andi Kleen
2010-08-12 22:32 ` Richard Henderson
2010-08-12 23:10 ` Richard Henderson
2010-08-12 23:13 ` Richard Henderson
2010-08-13 8:33 ` Andi Kleen
2010-08-13 7:26 ` Andi Kleen
2010-08-14 17:14 ` [CFT, v4] " Richard Henderson
2010-08-17 16:59 ` Steve Ellcey
2010-08-17 17:21 ` Richard Henderson
2010-08-17 20:32 ` Steve Ellcey
2010-08-18 17:14 ` Steve Ellcey
2010-08-17 17:32 ` Jakub Jelinek
2010-08-18 3:23 ` Tom Tromey
[not found] ` <1281998097.3725.3.camel@gargoyle>
[not found] ` <4C69C317.2080207@redhat.com>
[not found] ` <1282142212.3725.6.camel@gargoyle>
[not found] ` <4C6BF5F7.7040100@redhat.com>
[not found] ` <1282149264.3725.15.camel@gargoyle>
[not found] ` <4C6C0D92.7080100@redhat.com>
[not found] ` <1282151361.3725.19.camel@gargoyle>
[not found] ` <4C6C166A.90306@redhat.com>
[not found] ` <1282152938.3725.27.camel@gargoyle>
[not found] ` <4C6C39DB.8070409@redhat.com>
2010-08-18 21:50 ` Richard Henderson
2010-08-19 14:12 ` Luis Machado
2010-08-09 17:27 ` The speed of the compiler, was: Re: Combine four insns Joseph S. Myers
2010-08-09 18:23 ` Diego Novillo
2010-08-10 6:20 ` Chiheng Xu
2010-08-10 7:22 ` Chiheng Xu
2010-08-09 17:34 ` Steven Bosscher
2010-08-09 17:36 ` Diego Novillo
2010-08-09 23:13 ` Cary Coutant
2010-08-09 18:59 ` The speed of the compiler Ralf Wildenhues
2010-08-09 19:04 ` Diego Novillo
2010-08-09 21:12 ` The speed of the compiler, was: Re: Combine four insns Mike Stump
2010-08-09 23:48 ` Cary Coutant
2010-08-10 14:37 ` Bernd Schmidt
2010-08-10 14:40 ` Richard Guenther
2010-08-10 14:49 ` Bernd Schmidt
2010-08-10 15:06 ` Steven Bosscher
2010-08-10 15:06 ` Steven Bosscher
2010-08-10 16:27 ` Andi Kleen
2010-08-10 16:47 ` Steven Bosscher
2010-08-10 16:55 ` Andi Kleen
2010-08-10 17:03 ` David Daney
2010-08-11 8:53 ` Richard Guenther
2010-08-16 20:42 ` Mark Mitchell
2010-08-16 20:45 ` Bernd Schmidt
2010-08-16 21:03 ` Mark Mitchell
2010-08-18 20:50 ` Eric Botcazou
2010-08-18 22:03 ` Bernd Schmidt
2010-08-19 8:04 ` Eric Botcazou
2010-08-19 15:44 ` Mark Mitchell
2010-08-19 18:13 ` Bernd Schmidt
2010-08-19 18:25 ` Mark Mitchell
2010-08-19 18:42 ` Richard Henderson
2010-08-19 22:14 ` Eric Botcazou
2010-08-19 22:19 ` Bernd Schmidt
2010-08-19 22:21 ` Eric Botcazou
2010-08-19 22:37 ` Bernd Schmidt
2010-08-19 22:53 ` Steven Bosscher
2010-08-19 23:34 ` Andrew Pinski
2010-08-19 23:40 ` Bernd Schmidt
2010-08-20 1:59 ` Mark Mitchell
2010-08-20 3:56 ` Diego Novillo
2010-08-20 4:13 ` Mark Mitchell
2010-08-20 14:14 ` Eric Botcazou
2010-08-20 14:36 ` Paolo Bonzini
2010-08-21 13:46 ` Eric Botcazou
2010-08-23 17:03 ` Richard Guenther
2010-08-23 17:08 ` Mark Mitchell
2010-08-20 14:44 ` Mark Mitchell
2010-08-20 10:21 ` Paolo Bonzini
2010-08-20 0:21 ` H.J. Lu
2010-08-20 0:36 ` Bernd Schmidt
2010-08-20 14:07 ` H.J. Lu
2010-08-11 12:32 ` Michael Matz
2010-08-06 15:08 ` Steven Bosscher
2010-08-06 16:45 ` Paolo Bonzini
2010-08-06 17:22 ` Steven Bosscher
2010-08-06 18:02 ` Jeff Law
2010-08-06 20:44 ` Steven Bosscher
2010-08-06 20:48 ` Richard Guenther
2010-08-06 21:49 ` Jeff Law
2010-08-06 18:56 ` Vladimir N. Makarov
2010-08-06 19:02 ` Steven Bosscher
2010-08-06 21:11 ` Chris Lattner
2010-08-08 11:40 ` Paolo Bonzini
2010-08-12 5:53 ` Ian Lance Taylor
2010-08-06 19:20 ` Bernd Schmidt
2010-08-06 19:37 ` Jeff Law
2010-08-06 19:43 ` Bernd Schmidt
2010-08-06 21:46 ` Jeff Law
2010-08-09 14:54 ` Mark Mitchell
2010-08-09 15:04 ` Bernd Schmidt
2010-08-09 16:02 ` Chris Lattner
2010-08-09 16:07 ` Richard Guenther
2010-08-09 17:28 ` Joseph S. Myers
2010-08-09 16:19 ` Mark Mitchell
2010-08-09 17:02 ` Chris Lattner
2010-08-10 2:50 ` Mark Mitchell
2010-08-10 15:35 ` Chris Lattner
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