[Bug rtl-optimization/84101] [7/8/9 Regression] -O3 and -ftree-vectorize trying too hard for function returning trivial pair-of-uint64_t-structure

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84101

--- Comment #9 from Segher Boessenkool <segher at gcc dot gnu.org> ---
But that is exactly the kind of thing lower-subreg is supposed to do?