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From: "lthode at mail dot unomaha dot edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/37102] [4.3/4.4 Regression] out-of-SSA is broken
Date: Mon, 15 Sep 2008 01:04:00 -0000 [thread overview]
Message-ID: <20080915010326.20789.qmail@sourceware.org> (raw)
In-Reply-To: <bug-37102-12544@http.gcc.gnu.org/bugzilla/>
------- Comment #11 from lthode at mail dot unomaha dot edu 2008-09-15 01:03 -------
(In reply to comment #9)
> Thanks for the explanation, for the branch I would recommend an extra DCE
> pass right before pass_del_ssa. On the trunk we need to make sure to run
> this at -O0 as well. Note that the simple DCE can leave dead statements
> around, only control-dependent DCE will make sure to not retain any
> DCE opportunities.
>
Well, I tried just that (running CD-DCE right before Out-of-SSA independent of
optimization level) on the trunk, and 16 Fortran testcases blow up (with an ICE
in Out-of-SSA) at -O0 due to it. However, turning optimization on makes them
compile again, so running DCE at -O0 isn't such a great idea. On the other
hand, this should be easy enough to fix on the branch, as we can just run the
pass if optimization is enabled.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37102
next prev parent reply other threads:[~2008-09-15 1:04 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-13 3:46 [Bug c/37102] New: possible integer codegen bug regehr at cs dot utah dot edu
2008-08-13 9:54 ` [Bug tree-optimization/37102] [4.3/4.4 Regression] " rguenth at gcc dot gnu dot org
2008-08-13 9:55 ` rguenth at gcc dot gnu dot org
2008-08-14 10:04 ` jakub at gcc dot gnu dot org
2008-08-18 13:58 ` jsm28 at gcc dot gnu dot org
2008-08-26 13:39 ` cnstar9988 at gmail dot com
2008-08-27 22:13 ` jsm28 at gcc dot gnu dot org
2008-08-28 14:49 ` rguenth at gcc dot gnu dot org
2008-09-04 14:54 ` [Bug tree-optimization/37102] [4.3/4.4 Regression] out-of-SSA is broken rguenth at gcc dot gnu dot org
2008-09-04 16:10 ` amacleod at redhat dot com
2008-09-04 16:19 ` rguenth at gcc dot gnu dot org
2008-09-04 16:53 ` amacleod at redhat dot com
2008-09-15 1:04 ` lthode at mail dot unomaha dot edu [this message]
2008-09-17 14:26 ` rguenth at gcc dot gnu dot org
2008-09-17 14:35 ` amacleod at redhat dot com
2008-09-17 14:39 ` rguenth at gcc dot gnu dot org
2008-09-17 14:40 ` amacleod at redhat dot com
2008-09-17 14:49 ` amacleod at redhat dot com
2008-09-17 21:57 ` amacleod at redhat dot com
2008-09-18 14:01 ` amacleod at gcc dot gnu dot org
2008-09-18 20:06 ` [Bug tree-optimization/37102] [4.3 " amacleod at redhat dot com
2008-09-27 11:33 ` cnstar9988 at gmail dot com
2008-10-10 0:57 ` cnstar9988 at gmail dot com
2008-10-12 19:59 ` lthode at mail dot unomaha dot edu
2008-10-17 17:38 ` amacleod at gcc dot gnu dot org
2008-10-18 11:19 ` rguenth at gcc dot gnu dot org
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