[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 #10 from N Schaeffer <nathanael.schaeffer at gmail dot com> ---
intrestingly (and maybe surprisingly) I can get gcc to produce nearly optimal
code using vbroadcastsd with the following options:

    -O2 -march=skylake -ftree-vectorize