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From: "beschindler at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/62080] Suboptimal code generation with eigen library
Date: Mon, 11 Aug 2014 19:16:00 -0000	[thread overview]
Message-ID: <bug-62080-4-HHbhSkSUeN@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-62080-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62080

--- Comment #4 from Benjamin Schindler <beschindler at gmail dot com> ---
(In reply to Marc Glisse from comment #2)
> (note that a minimal, self-contained testcase would be much better and
> shouldn't be hard to produce)


I don't mind doing so, but I don't quite know what is required to trigger this
isssue. 

After chatting with a friend, I realized yet another issue with the generated
assembly: it makes a lot of use of unaligned reads (movdqu) as opposed to
movdqa. Eigen types are by design aligned and thus, it should be possible to
use the (from what I've been told) faster aligned reads

Cheers


  parent reply	other threads:[~2014-08-11 19:16 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-08-10 10:20 [Bug c++/62080] New: " beschindler at gmail dot com
2014-08-10 10:21 ` [Bug c++/62080] " beschindler at gmail dot com
2014-08-10 11:30 ` glisse at gcc dot gnu.org
2014-08-10 12:05 ` beschindler at gmail dot com
2014-08-11 19:16 ` beschindler at gmail dot com [this message]
2014-08-11 20:40 ` glisse at gcc dot gnu.org
2014-08-27  9:58 ` rguenth at gcc dot gnu.org
2020-04-06  9:43 ` [Bug middle-end/62080] " pinskia at gcc dot gnu.org
2020-04-06 10:34 ` glisse at gcc dot gnu.org
2021-07-18 21:18 ` pinskia at gcc dot gnu.org

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