[bla3]

That's only true if there are <= 3 "clusters" of switch case values, else compilers do smarter things. See https://youtu.be/gMqSinyL8uk

[vortico]

Is this what you mean by more clusters? Looks like clang compiles the two functions to roughly the same "tree search" code. https://godbolt.org/z/7M_3PU