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From: "qinzhao at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/102586] [12 Regression] ICE in clear_padding_type, at gimple-fold.c:4798 since r12-3433-ga25e0b5e6ac8a77a
Date: Fri, 11 Feb 2022 17:36:35 +0000 [thread overview]
Message-ID: <bug-102586-4-kjpL2xkH33@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-102586-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102586
qinzhao at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |qinzhao at gcc dot gnu.org
--- Comment #25 from qinzhao at gcc dot gnu.org ---
(In reply to Jakub Jelinek from comment #24)
> I bet with the default -flifetime-dse=2 we would then have a
> var = {};
> var ={v} {CLOBBER}; // Start of ctor clobber
> var.whatever = ...; // Ctor content
> and the zero initialization would be optimized away then.
> I guess ideal would be to emit such zero initialization in the complete
> object ctors right after the -flifetime-dse=2 beginning clobber and ideally
> one that clearly says to the gimplifier and rest of middle-end that it must
> initialize even padding bits.
> Because right now gimplification of var = {} will often happily lower that to
> var.a = 0; var.b = 0; var.c = 0;
> even when there are padding bits,
oh right, I recall that this was the reason why adding "var = {}" to initialize
the whole structure didn't work well for initialize all paddings. therefore we
have to explicitly call __builtin_clear_padding for clear all paddings.
next prev parent reply other threads:[~2022-02-11 17:36 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-04 7:30 [Bug tree-optimization/102586] New: " marxin at gcc dot gnu.org
2021-10-04 7:30 ` [Bug tree-optimization/102586] " marxin at gcc dot gnu.org
2021-10-04 8:21 ` jakub at gcc dot gnu.org
2021-10-04 8:22 ` marxin at gcc dot gnu.org
2021-10-04 11:43 ` jakub at gcc dot gnu.org
2021-10-04 12:04 ` jakub at gcc dot gnu.org
2021-11-15 13:03 ` jakub at gcc dot gnu.org
2021-11-15 13:05 ` jakub at gcc dot gnu.org
2022-01-17 13:14 ` rguenth at gcc dot gnu.org
2022-02-09 17:21 ` jason at gcc dot gnu.org
2022-02-10 14:08 ` jakub at gcc dot gnu.org
2022-02-10 14:18 ` jakub at gcc dot gnu.org
2022-02-10 15:29 ` jakub at gcc dot gnu.org
2022-02-10 15:35 ` jakub at gcc dot gnu.org
2022-02-10 15:56 ` jason at gcc dot gnu.org
2022-02-10 18:30 ` jakub at gcc dot gnu.org
2022-02-10 18:45 ` jason at gcc dot gnu.org
2022-02-10 19:27 ` jakub at gcc dot gnu.org
2022-02-10 22:07 ` jason at gcc dot gnu.org
2022-02-10 22:27 ` jakub at gcc dot gnu.org
2022-02-10 22:29 ` jakub at gcc dot gnu.org
2022-02-10 22:34 ` jakub at gcc dot gnu.org
2022-02-11 1:47 ` rodgertq at gcc dot gnu.org
2022-02-11 12:31 ` jakub at gcc dot gnu.org
2022-02-11 15:29 ` jason at gcc dot gnu.org
2022-02-11 16:23 ` qing.zhao at oracle dot com
2022-02-11 16:39 ` jakub at gcc dot gnu.org
2022-02-11 17:36 ` qinzhao at gcc dot gnu.org [this message]
2022-02-11 17:47 ` jakub at gcc dot gnu.org
2022-02-11 21:52 ` qing.zhao at oracle dot com
2022-03-12 4:40 ` jason at gcc dot gnu.org
2022-03-14 9:49 ` cvs-commit at gcc dot gnu.org
2022-04-07 7:15 ` cvs-commit at gcc dot gnu.org
2022-04-07 7:19 ` jakub at gcc dot gnu.org
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