[Bug target/114107] poor vectorization at -O3 when dealing with arrays of different multiplicity, good with -O2

[liuhongt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114107

--- Comment #11 from Hongtao Liu <liuhongt at gcc dot gnu.org> ---
(In reply to N Schaeffer from comment #9)
> In addition, optimizing for size with -Os leads to a non-vectorized
> double-loop (51 bytes) while the vectorized loop with vbroadcastsd (produced
> by clang -Os) leads to 40 bytes.
> It is thus also a missed optimization for -Os.

vectorization is enabled with O2 but not Os.