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

[nathanael.schaeffer at gmail dot com via Gcc-bugs]

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

--- Comment #9 from N Schaeffer <nathanael.schaeffer at gmail dot com> ---
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.