[Bug tree-optimization/83326] [8 Regression] SPEC CPU2017 648.exchange2_s ~6% performance regression with r255267 (reproducer attached)

[alexander.nesterovskiy at intel dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83326

--- Comment #6 from Alexander Nesterovskiy <alexander.nesterovskiy at intel dot com> ---
Thanks! I see performance gain on 648.exchange2_s (~6% on Broadwell and ~3% on
Skylake-X) reverting performance to r255266 level (Skylake-X regression was
~3%).
And loops unrolled with 2 and 3 iterations. It's surely fixed.