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From: "law at redhat dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/68013] [6 Regression] ICE on valid code at -O2 on x86_64-linux-gnu in duplicate_thread_path, at tree-ssa-threadupdate.c:2469 Date: Mon, 26 Oct 2015 15:26:00 -0000 [thread overview] Message-ID: <bug-68013-4-6tL4oh6YuJ@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-68013-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68013 Jeffrey A. Law <law at redhat dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |ASSIGNED Last reconfirmed| |2015-10-26 Ever confirmed|0 |1 --- Comment #1 from Jeffrey A. Law <law at redhat dot com> --- The problem here is the first block in an FSM path may not be added to VISITED_BBs. That in turn results in the threader finding a path which passes through that initial block a second time, reaching a different destination the second time through. This is caught by the assertion (to avoid generating incorrect code). Fixing is simple. But... I'm not real happy with how the affected code is structured, but I'm at a loss right now how to reorganize it in the immediate term. I'm hoping to get some clarity as I continue to look to replace the EDGE_DFS_BACK support in the old threader with the FSM threader. Anyway, I'll be committing a fix shortly.
next prev parent reply other threads:[~2015-10-26 15:26 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-10-19 3:24 [Bug tree-optimization/68013] New: " su at cs dot ucdavis.edu 2015-10-19 9:59 ` [Bug tree-optimization/68013] [6 Regression] " rguenth at gcc dot gnu.org 2015-10-26 15:26 ` law at redhat dot com [this message] 2015-10-26 15:36 ` law at gcc dot gnu.org 2015-10-26 15:37 ` law at redhat dot com
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