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[Bug tree-optimization/49452] [4.7 regression] comp-goto-2.c regresses in testing
- From: "eraman at google dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 14 Jul 2011 17:17:13 +0000
- Subject: [Bug tree-optimization/49452] [4.7 regression] comp-goto-2.c regresses in testing
- Auto-submitted: auto-generated
- References: <bug-49452-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49452
--- Comment #12 from Easwaran Raman <eraman at google dot com> 2011-07-14 17:16:06 UTC ---
(In reply to comment #11)
> I have confirmed that the -Os failures began with r175063 and that the tests
> pass for several revision before that and pass for several after, so it's
> unlikely to be an intermittent failure. If it would help I can send dump files
> for r175063 and the one just before that.
It is possible that the second DSE invocation deletes a necessary store. My
understanding was that it only acts on spilled stores and all my changes are in
the _nospill version, but that seems not to be the case. Could you send me all
the RTL dumps with and without this patch as a tar file? That will be very
useful in narrowing it down.
Thanks,
Easwaran