[Bug target/84986] Performance regression: loop no longer vectorized (x86-64)

[gergo.barany at inria dot fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84986

--- Comment #1 from Gergö Barany <gergo.barany at inria dot fr> ---
Created attachment 43714
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43714&action=edit
test driver