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[Bug tree-optimization/65177] [5 Regression]: extend jump thread for finite state automata causes miscompilation
- From: "law at redhat dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 10 Mar 2015 22:07:54 +0000
- Subject: [Bug tree-optimization/65177] [5 Regression]: extend jump thread for finite state automata causes miscompilation
- Auto-submitted: auto-generated
- References: <bug-65177-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65177
--- Comment #8 from Jeffrey A. Law <law at redhat dot com> ---
There's not enough information in those comments to definitively say the SEME
copier isn't updating the SSA graph properly. If I were looking at this, I'd
want the dump as we enter VRP or DOM (whichever is triggering the problematic
FSM thread), then a dump after that pass was done. Preferably the dumps would
include the basic block information (-fdump-tree-<whatever>-blocks). Knowing
the shape of the CFG is critical to proving or disproving the SEME copier is
mucking things up.