[Bug tree-optimization/123983] [16 Regression] wrong code at -O1 -ftree-vectorize on x86_64-pc-linux-gnu

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123983

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 63596
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=63596&action=edit
patch

The reversal tests ok on x86_64, I've attached it for reference.  I'll see to
test on aarch64.

If you can quickly tell me a failing testcase that would be nice ;)