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[Bug tree-optimization/72772] Missed SCEV after pass reordering@236440
- From: "amker at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 02 Aug 2016 09:50:37 +0000
- Subject: [Bug tree-optimization/72772] Missed SCEV after pass reordering@236440
- Auto-submitted: auto-generated
- References: <bug-72772-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72772
--- Comment #2 from amker at gcc dot gnu.org ---
(In reply to Richard Biener from comment #1)
> Note that for some odd reason creating the preheader causes the PHI to appar.
> Fixing that would be appreciated - it's the make_forwarder_block CFG hook
> that causes this. Not sure why create_preheader doesn't special-case the
> single_entry != NULL case by simply splitting the edge.
>
Thanks. I am also testing patch to simplify_using_initial_conditions and
loop_exits_before_oveflow. I think they worth fixing too because patches are
kind like a simplification. Anyway I will send for comment once passes
bootstrap&test.