[Bug rtl-optimization/78116] New: [7 regression] Performance drop after r241173 on avx512 target

[ysrumyan at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78116

            Bug ID: 78116
           Summary: [7 regression] Performance drop after r241173 on
                    avx512 target
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ysrumyan at gmail dot com
  Target Milestone: ---

I attached the simple test-case to reproduce issue.
Before this revision loop marked with label .L27 has 25 instructions but
after it additional fills were added and it has +8 more instructions.
In result we got > 6% performance drop on important benchmark.