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[Bug tree-optimization/78731] Possible bug with switch when optimization is turned on.
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 09 Dec 2016 09:36:38 +0000
- Subject: [Bug tree-optimization/78731] Possible bug with switch when optimization is turned on.
- Auto-submitted: auto-generated
- References: <bug-78731-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78731
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 40285
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40285&action=edit
patch
Ah, finally a testcase! (I have one I can't disclose and thus didn't post the
patch without a good testcase for Jeff to look at)
The issue is that jump threading across backedges may, when following the SSA
value chain, pick up values from a previous iteration.