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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/54073] [4.7/4.8 Regression] SciMark Monte Carlo test performance has seriously decreased in recent GCC releases
Date: Tue, 13 Nov 2012 15:14:00 -0000 [thread overview]
Message-ID: <bug-54073-4-jCkKNNEK6z@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-54073-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54073
--- Comment #10 from Uros Bizjak <ubizjak at gmail dot com> 2012-11-13 15:13:56 UTC ---
(In reply to comment #8)
> The attached proof of concept patch attempts to just restore the 4.6 and
> earlier behavior by allowing in all comparisons. Of course perhaps it might be
> possible it needs better tuning than that, I meant it just as a start for
> discussions.
Please see PR53346, from comment 14 onwards, especially H.J.'s comment:
-quote-
I was told that cmov wins if branch is mispredicted, otherwise
cmov loses. We will investigate if we can improve cmov in GCC.
-/quote-
next prev parent reply other threads:[~2012-11-13 15:14 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-23 15:25 [Bug tree-optimization/54073] New: " t.artem at mailcity dot com
2012-07-23 15:44 ` [Bug tree-optimization/54073] " t.artem at mailcity dot com
2012-07-24 9:23 ` [Bug tree-optimization/54073] [4.7/4.8 Regression] " rguenth at gcc dot gnu.org
2012-07-24 11:29 ` markus at trippelsdorf dot de
2012-07-24 13:21 ` rguenth at gcc dot gnu.org
2012-07-26 15:41 ` venkataramanan.kumar at amd dot com
2012-07-26 16:13 ` markus at trippelsdorf dot de
2012-08-16 11:06 ` rguenth at gcc dot gnu.org
2012-09-07 10:09 ` rguenth at gcc dot gnu.org
2012-09-20 10:28 ` jakub at gcc dot gnu.org
2012-11-13 13:05 ` jakub at gcc dot gnu.org
2012-11-13 15:07 ` t.artem at mailcity dot com
2012-11-13 15:14 ` ubizjak at gmail dot com [this message]
2012-11-13 15:24 ` jakub at gcc dot gnu.org
2012-11-13 15:55 ` hubicka at gcc dot gnu.org
2012-11-16 11:41 ` jakub at gcc dot gnu.org
2012-11-16 14:50 ` [Bug tree-optimization/54073] [4.7 " jakub at gcc dot gnu.org
2012-12-31 9:41 ` pinskia at gcc dot gnu.org
2013-02-16 19:12 ` jake.stine at gmail dot com
2013-02-17 8:41 ` ubizjak at gmail dot com
2013-04-11 7:59 ` rguenth at gcc dot gnu.org
2014-06-12 13:16 ` rguenth at gcc dot gnu.org
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