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From: "hubicka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/55187] [4.8 regression] not able to determine number if iterations of loops with perfect nest.
Date: Mon, 05 Nov 2012 16:27:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55187

Jan Hubicka <hubicka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-11-05
            Summary|[4.8 regression] FAIL:      |[4.8 regression] not able
                   |gcc.dg/autopar/pr49960.c    |to determine number if
                   |scan-tree-dump-times        |iterations of loops with
                   |parloops "SUCCESS: may be   |perfect nest.
                   |parallelized" 0             |
     Ever Confirmed|0                           |1
           Severity|normal                      |enhancement

--- Comment #3 from Jan Hubicka <hubicka at gcc dot gnu.org> 2012-11-05 16:27:17 UTC ---
I fixed autopar testcase by
http://gcc.gnu.org/ml/gcc-patches/2012-11/msg00368.html It was working by
accident, not by design.

We however really miss optimization here: in perfect loop nest the loop headers
should go ahead all the loops (as explained in the mail).  So lets make this PR
to track it.