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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/102844] [9/10/11/12/13 Regression] DOM jump threading not copying block that became non-empty
Date: Fri, 20 May 2022 08:24:29 +0000	[thread overview]
Message-ID: <bug-102844-4-DPThw58FgC@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-102844-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102844

--- Comment #25 from Richard Biener <rguenth at gcc dot gnu.org> ---
I'm not sure about the state of this bug - the issue reproduces on the GCC 10
branch with checking enabled and -O[2s] -fdisable-tree-fre4
-fno-strict-overflow

It might be that using the backward threader from DOM (are we now doing that?)
makes this truly fixed but I'm not sure the backward threader is resilent
to the issue analyzed in comments #13 to #15.  Eventually the NOCOPY
special-casing could be removed as premature optimization (CFG cleanup will
remove any copied forwarders), but then IIRC we have a hard limit on the
number of blocks the threader handles.

  parent reply	other threads:[~2022-05-20  8:24 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-19 17:45 [Bug c/102844] New: gcc-9.x miscompiles unsigned char expression in switch breiten at lexmark dot com
2021-10-19 17:58 ` [Bug tree-optimization/102844] [9/10/11/12 Regression] " pinskia at gcc dot gnu.org
2021-10-19 18:11 ` pinskia at gcc dot gnu.org
2021-10-19 18:13 ` pinskia at gcc dot gnu.org
2021-10-19 18:23 ` [Bug tree-optimization/102844] [9/10/11/12 Regression] vrp inserting assert causes miscompiling when doing update_ssa pinskia at gcc dot gnu.org
2021-10-20  7:10 ` rguenth at gcc dot gnu.org
2021-10-20  7:44 ` rguenth at gcc dot gnu.org
2021-10-20  7:49 ` rguenth at gcc dot gnu.org
2021-10-20  8:08 ` marxin at gcc dot gnu.org
2021-10-20  8:28 ` rguenth at gcc dot gnu.org
2021-10-20  8:33 ` marxin at gcc dot gnu.org
2021-10-20  8:59 ` rguenth at gcc dot gnu.org
2021-10-20  9:00 ` rguenth at gcc dot gnu.org
2021-10-20  9:03 ` rguenth at gcc dot gnu.org
2021-10-20  9:08 ` rguenth at gcc dot gnu.org
2021-10-20  9:19 ` rguenth at gcc dot gnu.org
2021-10-20  9:21 ` aldyh at gcc dot gnu.org
2021-10-20  9:30 ` rguenther at suse dot de
2021-10-20  9:47 ` aldyh at gcc dot gnu.org
2021-10-20  9:50 ` rguenth at gcc dot gnu.org
2021-10-20  9:50 ` rguenth at gcc dot gnu.org
2021-10-20 10:56 ` marxin at gcc dot gnu.org
2021-10-20 12:49 ` [Bug tree-optimization/102844] [9/10/11/12 Regression] DOM jump threading not copying block that became non-empty amacleod at redhat dot com
2021-10-20 16:13 ` law at gcc dot gnu.org
2021-10-21  6:02 ` rguenth at gcc dot gnu.org
2022-05-20  8:24 ` rguenth at gcc dot gnu.org [this message]
2022-05-20 12:01 ` [Bug tree-optimization/102844] [9/10/11/12/13 " aldyh at gcc dot gnu.org
2022-05-20 15:11 ` law at gcc dot gnu.org
2022-05-20 15:33 ` aldyh at gcc dot gnu.org
2022-05-27  9:46 ` [Bug tree-optimization/102844] [10/11/12/13 " rguenth at gcc dot gnu.org
2022-06-28 10:46 ` jakub at gcc dot gnu.org
2023-01-19 13:26 ` rguenth at gcc dot gnu.org
2023-07-07 10:41 ` [Bug tree-optimization/102844] [11/12/13/14 " rguenth at gcc dot gnu.org
2023-09-19 11:24 ` rguenth at gcc dot gnu.org
2023-09-19 11:25 ` [Bug tree-optimization/102844] [11/12/13 " rguenth at gcc dot gnu.org

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