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[Bug tree-optimization/55187] [4.8 regression] not able to determine number if iterations of loops with perfect nest.
- From: "hubicka at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 05 Nov 2012 16:27:17 +0000
- Subject: [Bug tree-optimization/55187] [4.8 regression] not able to determine number if iterations of loops with perfect nest.
- Auto-submitted: auto-generated
- References: <bug-55187-4@http.gcc.gnu.org/bugzilla/>
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.