[Bug tree-optimization/118657] Missed optimization (unreachable branch could be pruned after taking into account the possible values of a constexpr lookup table)

[andi-gcc at firstfloor dot org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118657

--- Comment #9 from Andi Kleen <andi-gcc at firstfloor dot org> ---
With constexpr you are guaranteed an visible initializer. const would
potentially require messing with IPA and might impossible.