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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/110891] [14 Regression] Dead Code Elimination Regression since r14-2674-gd0de3bf9175
Date: Sat, 26 Aug 2023 06:35:44 +0000 [thread overview]
Message-ID: <bug-110891-4-hcfIYP1qit@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-110891-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110891
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |pinskia at gcc dot gnu.org
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I have a patch for what I laid out in comment #3 and it solves the original
issue too because after ifcombine we have:
_24 = _28 == &c;
_18 = _28 == &d;
_8 = _18 | _24;
_25 = _28 == &a;
_20 = _8 | _25;
if (_20 != 0)
goto <bb 4>; [99.98%]
else
goto <bb 3>; [0.02%]
<bb 3> [local count: 210453]:
__assert_fail ("", "", 4, &__PRETTY_FUNCTION__);
<bb 4> [local count: 536765685]:
_6 = _28 == &c;
_13 = _28 == &d;
_9 = _6 | _13;
_27 = _28 == &a;
_17 = _9 | _27;
if (_17 != 0)
goto <bb 6>; [99.98%]
else
goto <bb 5>; [0.02%]
Which then obviously gets optimized by DOM2.
next prev parent reply other threads:[~2023-08-26 6:35 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-03 16:01 [Bug tree-optimization/110891] New: " theodort at inf dot ethz.ch
2023-08-03 16:03 ` [Bug tree-optimization/110891] " pinskia at gcc dot gnu.org
2023-08-03 16:13 ` pinskia at gcc dot gnu.org
2023-08-04 7:59 ` rguenth at gcc dot gnu.org
2023-08-26 0:00 ` pinskia at gcc dot gnu.org
2023-08-26 0:06 ` pinskia at gcc dot gnu.org
2023-08-26 6:35 ` pinskia at gcc dot gnu.org [this message]
2023-08-26 6:35 ` pinskia at gcc dot gnu.org
2023-08-27 23:46 ` pinskia at gcc dot gnu.org
2023-08-28 6:53 ` rguenther at suse dot de
2024-03-07 23:26 ` law at gcc dot gnu.org
2024-03-09 7:01 ` law at gcc dot gnu.org
2024-05-07 7:41 ` [Bug tree-optimization/110891] [14/15 " rguenth at gcc dot gnu.org
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