[Bug target/80689] 128 loads generated for structure copying with gcc 7.1.0 and leads to STLF stalls in avx2 targets.

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80689

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Note that using unaligned 128bit moves might involve an even larger STLF
penalty than if the loads/stores were aligned due to the fact they might cross
a cache-line boundary and how store queues usually are laid out on cache-line
arrangement.