[Bug rtl-optimization/122607] `(plus (plus (ltu a 0) b)` split could be better

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122607

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The missed optimization is in f2. f1 is optimial already.