https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67239
--- Comment #15 from rguenther at suse dot de <rguenther at suse dot de> --- On November 14, 2015 12:09:28 AM GMT+01:00, "hjl.tools at gmail dot com" <gcc-bugzi...@gcc.gnu.org> wrote: >https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67239 > >--- Comment #14 from H.J. Lu <hjl.tools at gmail dot com> --- >(In reply to Richard Biener from comment #13) >> >> Can you check whether disabling PRE fixes the runtime failure? >> > >-O1: OK. >-O1 -finline-small-functions: Bad. >-O1 -fno-tree-fre -finline-small-functions: Bad. So maybe bisect with the no-fre case then.