Disable alignment, but enable vectorization
The logic in
ConfigureVectorization.h is not correct. It makes impossible to allow vectorization but disable alignment. In documentation it says that
EIGEN_MAX_ALIGN_BYTES=0 should force no alignment, but this is not true.
If ideal alignment is larger, this will be used as default alignment. So with
-mavx flags there will be
EIGEN_DEFAULT_ALIGN_BYTES=32 regardless of
See https://godbolt.org/z/W5xbda (all arrays are aligned despite the setting)