[Bug tree-optimization/86270] [12/13/14 Regression] Simple loop needs an extra register and an extra instruction

[jamborm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86270

--- Comment #20 from Martin Jambor <jamborm at gcc dot gnu.org> ---
We no longer track Zen1 performence, but this hasbrought about a dramatic
improvement of 465.tonto on our SomeKindOfLake machine:

https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=464.230.0

Thanks!