[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 #3 from Patrik Huber <patrikhuber at gmail dot com> ---
@Richard: I'm not 100% sure what you mean with "preprocessed source" but I
googled and you probably mean the output of compiling with "-c -save-temps".

Please see attached.