[Bug rtl-optimization/93564] [10 Regression] 470.lbm regresses by 25% on znver2 with -Ofast -march=native LTO and PGO since r10-6384-g2a07345c4f8dabc2

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93564

--- Comment #7 from Martin Liška <marxin at gcc dot gnu.org> ---
commit r10-7093-g5dc1390b41db5c1765e25fd21dad1a930a015aac
Author: Vladimir N. Makarov <vmakarov@redhat.com>
Date:   Mon Mar 9 14:05:09 2020 -0400

    Revert: One more patch for PR93564: Prefer smaller hard regno when we do
not honor reg alloc order.

    2020-03-09  Vladimir Makarov  <vmakarov@redhat.com>

            Revert:

            2020-02-28  Vladimir Makarov  <vmakarov@redhat.com>

            PR rtl-optimization/93564
            * ira-color.c (assign_hard_reg): Prefer smaller hard regno when we
            do not honor reg alloc order.