[Bug target/78994] -Ofast makes aarch64 C++ benchmark slower for A53

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78994

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
https://gcc.gnu.org/ml/gcc-patches/2017-01/msg00637.html