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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug other/67659] ICE: Linux kernel/rcu/tree.c:3261:6
Date: Mon, 21 Sep 2015 06:28:00 -0000 [thread overview]
Message-ID: <bug-67659-4-zEswq5mfv7@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-67659-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67659
Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2015-09-21
Ever confirmed|0 |1
--- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Nathan McSween from comment #0)
> ICE while compiling linux kernel, at kernel/rcu/tree.c:3261:6 using latest
> git as of sunday 2015-09-20
Please provide all required information, as instructed in [1].
[1] https://gcc.gnu.org/bugs/
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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/67662] -fsanitize=undefined cries wolf for X - 1 + X when X is 2**30
Date: Mon, 21 Sep 2015 06:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idg662
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2015-09-21
Component|sanitizer |middle-end
Ever confirmed|0 |1
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is a reassociation issue inside fold-const. Basically we change x - 1 + x
to x + x - 1 which is invalid as it introduces an overflow which was not there
before. (This is why we need an addition tree where overflow is defined).
next prev parent reply other threads:[~2015-09-21 6:28 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-20 22:34 [Bug other/67659] New: " nwmcsween at gmail dot com
2015-09-21 6:28 ` ubizjak at gmail dot com [this message]
2015-09-25 2:54 ` [Bug tree-optimization/67659] [5 regression] ICE: segfault: " trippels at gcc dot gnu.org
2015-09-25 7:30 ` trippels at gcc dot gnu.org
2015-09-25 8:03 ` trippels at gcc dot gnu.org
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