[Bug tree-optimization/127902] clang warning -Wsometimes-uninitialized for tree-ssa-forwprop.cc:3526:

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127902

--- Comment #2 from Drea Pinski <pinskia at gcc dot gnu.org> ---
Yes fn can only be IFN_CTZ or IFN_CLZ as it is only set to those 2 values
above.

So a false positive from clangs warning here.