[Bug tree-optimization/110838] [14 Regression] wrong code on x365-3.5, -O3, sign extraction

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110838

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Indeed we have

vector(8) signed short << 31

here, so it looks like a bug in the vectorizer to me, now only find the dup...