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From: "izamyatin at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/64081] New: [5 Regression] r217827 prevents RTL loop unroll
Date: Wed, 26 Nov 2014 08:56:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64081

            Bug ID: 64081
           Summary: [5 Regression] r217827 prevents RTL loop unroll
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: izamyatin at gmail dot com
            Target: x86

Created attachment 34123
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34123&action=edit
reproducer

Noticed that for the attached test no RTL loop unroll started to happen.
It is because of changes in dom - namely, I see in dumps that dom2 complicates
loop structure. (probably because of changes in lookup_avail_expr?)
Looks like r217827 doesn't mean this :)

Options that should be used - just "-O2  -funroll-loops"