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

[amker at gcc dot gnu.org]

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

amker at gcc dot gnu.org changed:

           What    |Removed                     |Added
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                 CC|                            |amker at gcc dot gnu.org

--- Comment #11 from amker at gcc dot gnu.org ---
According to Pat's report, the proposed patch for PR77536 can resolve the
second test regression, but introduces 4 additional copy instructions. 
https://gcc.gnu.org/ml/gcc-patches/2017-02/msg01081.html

I checked tree dump information, the only difference is frequency counters are
now fixed, but IRA/reload still make bad choice with "correct" profiling
information.