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From: "su at cs dot ucdavis.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/67828] [6 Regression] wrong code at -O3 on x86_64-linux-gnu
Date: Wed, 07 Oct 2015 15:22:00 -0000 [thread overview]
Message-ID: <bug-67828-4-aYEA65iEsl@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-67828-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67828
--- Comment #5 from Zhendong Su <su at cs dot ucdavis.edu> ---
> This testcase invokes undefined behavior because of the overflow on the
> iterator, ...
Just a quick comment that the testcase doesn't have undefined behaviors. As the
variable c is of type short, there shouldn't be signed overflow --- the
operations will be performed on its signed extended integer value and then
truncated back to a short.
Thanks for looking into and fixing the issue.
next prev parent reply other threads:[~2015-10-07 15:22 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-67828-4@http.gcc.gnu.org/bugzilla/>
2015-10-05 8:44 ` rguenth at gcc dot gnu.org
2015-10-05 10:07 ` mpolacek at gcc dot gnu.org
2015-10-06 7:40 ` aoliva at gcc dot gnu.org
2015-10-06 8:48 ` rguenth at gcc dot gnu.org
2015-10-07 15:22 ` su at cs dot ucdavis.edu [this message]
2015-10-07 15:28 ` su at cs dot ucdavis.edu
2015-10-09 12:19 ` aoliva at gcc dot gnu.org
2015-10-09 12:20 ` aoliva at gcc dot gnu.org
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