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[Bug rtl-optimization/78116] [7 regression] Performance drop after r241173 on avx512 target
- 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: Fri, 17 Feb 2017 09:57:09 +0000
- Subject: [Bug rtl-optimization/78116] [7 regression] Performance drop after r241173 on avx512 target
- Auto-submitted: auto-generated
- References: <bug-78116-4@http.gcc.gnu.org/bugzilla/>
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.