Beating gcc/clang/icc is not a trivial task. One can engineer the pair `{benchmark compiler pass}` in such a manner that they show a speedup, but over a benchma

Beating gcc/clang/icc is not a trivial task. One can engineer the pair `{benchmark compiler pass}` in such a manner that they show a speedup, but over a benchmark suite say like the SPEC suite, general community consensus is that it is very difficult and their paper doesn't reveal that they've found a secret sauce (sauce := compiler pass).