[Bug regression/91654] New: Regressions of SPEC2017 rate caused by r274994

[crazylht at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91654

            Bug ID: 91654
           Summary: Regressions of SPEC2017 rate caused by r274994
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: regression
          Assignee: unassigned at gcc dot gnu.org
          Reporter: crazylht at gmail dot com
  Target Milestone: ---

compiled with -march=skylake-avx512 -Ofast -funroll-loops -flto

--------------------------------
531.deepsjeng_r  -7.18%
548.exchange_r  -6.70%
557.xz_r -6.74%
508.namd_r -2.81%
527.cam4_r -6.48%
544.nab_r -3.99%
Tested on skylake server.
-------------------------------------

Refer to
https://gcc.gnu.org/ml/gcc-patches/2019-08/msg02129.html