[Bug target/111905] -O3 vectorization terribly pessimizes the code for an already unrolled loop

[kamkaz at windowslive dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111905

--- Comment #3 from Kamil Kaznowski <kamkaz at windowslive dot com> ---
Created attachment 56166
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=56166&action=edit
a smaller example

A smaller example.
Compilation flags:
-O2 -march=x86-64-v3 -std=c++23
vs
-O3 -march=x86-64-v3 -std=c++23