[Bug target/67288] [6/7/8 regression] non optimal simple function (useless additional shift/remove/shift/add)

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67288

--- Comment #10 from Segher Boessenkool <segher at gcc dot gnu.org> ---
This loop init stuff is created by the RTL loop optimisers; if those could see
0 cannot happen, they can optimise this.