[Bug tree-optimization/120817] [13/14/15/16 regression] Wrong code when compiled with -O1 -ftree-loop-vectorize for AArch64 target

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120817

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
A C testcase would be really nice.