[Bug tree-optimization/68654] [6 Regression] CoreMark Pro performance degradation

[izamyatin at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68654

--- Comment #6 from Igor Zamyatin <izamyatin at gmail dot com> ---
Created attachment 36961
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36961&action=edit
Dumps

Profilers show that core_state_transition and calc_func indeed became slower
after r228668.

First difference in dumps seems start in expand pass. I attached the dumps -
quick look shows that there are extra register copies in several places could
be seen.

Options that were used - -m32  -Ofast -funroll-loops -flto -static
-march=core-avx2