Or here: https://github.com/rochus-keller/Oberon/blob/master/testcase...
The main repository only recently added a C++ implementation, but it was significantly slower than mine when I check last time (see https://github.com/smarr/are-we-fast-yet/issues/80).
I mostly use the benchmarks to check how my compilers do compared to the big ones, or how the technologies I'm interested in evolve.