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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/102606] large array in a dead-code is not optimized away at -O0
Date: Tue, 05 Oct 2021 16:17:46 +0000 [thread overview]
Message-ID: <bug-102606-4-IbvMpNp90n@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-102606-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102606
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |jakub at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Or VLA.
Anyway, even at -O0 we can optimize away some if (0)s, but we need assurance
that there are no labels in there and that the code really dead. So, e.g. if
constexpr (0) can be optimized away because there is a language guarantee that
one can't jump into those bodies.
next prev parent reply other threads:[~2021-10-05 16:17 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-05 11:48 [Bug c/102606] New: miscompilation of a program with large array in a dead-code k.even-mendoza at imperial dot ac.uk
2021-10-05 11:52 ` [Bug middle-end/102606] large array in a dead-code is not optimized away at -O0 pinskia at gcc dot gnu.org
2021-10-05 12:08 ` rguenth at gcc dot gnu.org
2021-10-05 16:17 ` jakub at gcc dot gnu.org [this message]
2021-10-05 18:02 ` k.even-mendoza at imperial dot ac.uk
2021-10-08 20:47 ` pinskia at gcc dot gnu.org
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