[Bug target/84280] [6/7/8 Regression] Performance regression in g++-7 with Eigen for non-AVX2 CPUs

[patrikhuber at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84280

--- Comment #13 from Patrik Huber <patrikhuber at gmail dot com> ---
>> Did you try with FDO?  (-fprofile-generate, run, -fprofile-use)

I just tried this with g++-7. It didn't help, the final executable has the same
slower run time as in the attached log without the FDO.