[Bug tree-optimization/91934] Performance regression on 8.3.0 with -O3 and avx

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91934

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW
      Known to work|                            |8.2.0

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Dmitrii Tochanskii from comment #4)
>
> I don't have 8.2 now but according to godbolt it generates more adequate
> code.

Indeed 8.2 simply doesn't vectorize the unroll-and-jam'ed loop.