This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug tree-optimization/65177] [5 Regression]: extend jump thread for finite state automata causes miscompilation
- From: "spop at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 13 Mar 2015 20:46:57 +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 #16 from Sebastian Pop <spop at gcc dot gnu.org> ---
Created attachment 35030
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35030&action=edit
IR before and after for failing FSM jump thread
After updating the sources of GCC, I now see the fail as Jakub has reported at
dbgctr=199.
The difference between 198 and 199 is this jump thread path:
FSM jump thread: (13, 53) incoming edge; (53, 55) (55, 64) (64, 66) (66,
67) (67, 68) (68, 69) (69, 95) (95, 94) (94, 5) nocopy; (94, 5)
The attached file is a dump of the IR just before and after SEME code
generation of this path.