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From: "steven at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/19038] [4.0 Regression] out-of ssa causing loops to have more than one BB
Date: Thu, 23 Dec 2004 16:00:00 -0000 [thread overview]
Message-ID: <20041223160054.1694.qmail@sourceware.org> (raw)
In-Reply-To: <20041216155140.19038.dje@gcc.gnu.org>
------- Additional Comments From steven at gcc dot gnu dot org 2004-12-23 16:00 -------
s/fixing/papering over/ in the previous comment ;-)
This appears to be a problem with loop-closed ssa form, but I don't
quite understand it yet. But we should fix this on trees no matter
what, we don't need another RTL pass.
But 12.5%, wow! Making this a "normal" bug (not `enhancement') and
upgrading to P1. We really shoud fix this for GCC 4.0. If not for
performance then for the just completely broken idea that we turn a
simple 1 BB loop into a complex multiple-BBs loop. I'm quite sure
that this hurts a lot more than just SMS. (Actually, that is what
that 12.5% shows, of course.)
--
What |Removed |Added
----------------------------------------------------------------------------
Severity|minor |normal
Priority|P2 |P1
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19038
next prev parent reply other threads:[~2004-12-23 16:00 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-16 15:52 [Bug rtl-optimization/19038] New: Loop header copying dje at gcc dot gnu dot org
2004-12-16 21:39 ` [Bug rtl-optimization/19038] " dje at gcc dot gnu dot org
2004-12-16 22:55 ` steven at gcc dot gnu dot org
2004-12-17 4:04 ` pinskia at gcc dot gnu dot org
2004-12-17 4:05 ` pinskia at gcc dot gnu dot org
2004-12-17 4:16 ` pinskia at gcc dot gnu dot org
2004-12-17 4:28 ` pinskia at gcc dot gnu dot org
2004-12-20 18:25 ` [Bug tree-optimization/19038] [4.0 Regression] out-of ssa causing loops to have more than one BB pinskia at gcc dot gnu dot org
2004-12-20 19:04 ` pinskia at gcc dot gnu dot org
2004-12-20 19:23 ` pinskia at gcc dot gnu dot org
2004-12-20 19:47 ` pinskia at gcc dot gnu dot org
2004-12-22 19:03 ` steven at gcc dot gnu dot org
2004-12-23 2:41 ` pinskia at gcc dot gnu dot org
2004-12-23 15:19 ` dje at gcc dot gnu dot org
2004-12-23 16:00 ` steven at gcc dot gnu dot org [this message]
2004-12-24 12:13 ` mustafa at il dot ibm dot com
2004-12-24 12:42 ` steven at gcc dot gnu dot org
2004-12-24 12:46 ` steven at gcc dot gnu dot org
2004-12-24 12:52 ` steven at gcc dot gnu dot org
2004-12-24 12:55 ` steven at gcc dot gnu dot org
2004-12-26 1:09 ` dberlin at gcc dot gnu dot org
2004-12-26 15:06 ` pinskia at gcc dot gnu dot org
2004-12-27 21:08 ` law at redhat dot com
2004-12-28 8:22 ` law at redhat dot com
2004-12-28 9:18 ` law at redhat dot com
2004-12-28 23:32 ` law at redhat dot com
2004-12-29 19:33 ` steven at gcc dot gnu dot org
2004-12-29 20:50 ` pinskia at gcc dot gnu dot org
2004-12-29 20:52 ` pinskia at gcc dot gnu dot org
2004-12-29 21:06 ` law at redhat dot com
2004-12-30 17:27 ` pinskia at gcc dot gnu dot org
2004-12-30 18:39 ` law at redhat dot com
2004-12-30 18:49 ` pinskia at gcc dot gnu dot org
2004-12-30 21:51 ` pinskia at gcc dot gnu dot org
2005-01-04 4:04 ` law at redhat dot com
2005-01-04 4:10 ` pinskia at gcc dot gnu dot org
2005-01-10 20:02 ` pinskia at gcc dot gnu dot org
2005-01-12 13:34 ` amacleod at redhat dot com
2005-01-18 0:50 ` [Bug tree-optimization/19038] [4.0 Regression] ivopts " pinskia at gcc dot gnu dot org
2005-01-18 5:02 ` law at redhat dot com
2005-01-19 22:50 ` cvs-commit at gcc dot gnu dot org
2005-01-19 23:25 ` [Bug tree-optimization/19038] [4.0 Regression] out of ssa " pinskia at gcc dot gnu dot org
2005-01-19 23:34 ` pinskia at gcc dot gnu dot org
2005-01-20 0:31 ` pinskia at gcc dot gnu dot org
2005-01-20 0:47 ` pinskia at gcc dot gnu dot org
2005-01-20 1:15 ` pinskia at gcc dot gnu dot org
2005-01-21 13:18 ` steven at gcc dot gnu dot org
2005-01-21 13:22 ` rakdver at atrey dot karlin dot mff dot cuni dot cz
2005-01-21 13:27 ` steven at gcc dot gnu dot org
2005-01-21 13:29 ` [Bug tree-optimization/19038] [4.0 Regression] tree-ssa " steven at gcc dot gnu dot org
2005-01-21 19:19 ` dberlin at gcc dot gnu dot org
2005-01-22 1:51 ` dberlin at gcc dot gnu dot org
2005-01-22 16:48 ` cvs-commit at gcc dot gnu dot org
2005-01-22 16:49 ` dberlin at gcc dot gnu dot org
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