--- Comment #12 from Richard Biener <rguenth at gcc dot> ---
Hmm, the preprocessed source(s) are hard to work with given the eigen headers
seem to have conditional code on the enabled ISAs.

>From a quick look it seems to be inlining related?  My past experience says
that compute kernels in C++ should have the flatten attribute attached to

Did you try with FDO?  (-fprofile-generate, run, -fprofile-use)

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